Engine Controls - Tests W/codes - Body Control Computer Jeep Grand Cherokee ZJ

DESCRIPTION

The body control computer system, also referred to as the Body Control Module (BCM) system, consists of a combination of modules that communicate over the Chrysler Collision Detection (CCD) BUS system. Through the CCD BUS, information related to the operation of vehicle components and circuits is relayed to the appropriate system module(s). Each module receives the same component information. This reduces the complexity of vehicle wiring and size of wiring harness.

The following BCM systems are covered in this article: electronic instrument cluster, electro/mechanical instrument cluster, compass/mini-trip module, power door locks, Remote Keyless Entry (RKE), side door memory lock, windshield wiper, illuminated entry, courtesy lights, key-in light system, headlight time delay, liftgate release, seat belt warning light system and chimes. System failures within these systems can be diagnosed via the CCD BUS Data Link Connector (DLC) using Chrysler Diagnostic Readout Box (DRB) tester.

OPERATION

Diagnostic test procedures are designed to detect system faults as quickly as possible. Body and chassis trouble codes are accessed through the Data Link Connector (DLC). DLC is located under left side of dash. (Scheme 42) DRB tester is used to access information from CCD BUS. See ENTERING ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.

Scheme 42

The body control computer, also referred to as the Body Control Module (BCM), is located behind center console. BCM stores odometer information for electronic instrument cluster and electro/mechanical instrument cluster display and provides power and ground for a variety of systems. Systems are monitored by BCM through voltage drops.

CCD BUS

The CCD BUS is a twisted pair of wires traveling from module to module, receiving and delivering coded information. The code identifies the message and its importance. When multiple messages attempt to access CCD BUS at once, code assigns priority ranking. The 2 twisted wires used by the CCD BUS system are called BUS "+" and BUS "-". Both wires carry approximately 2.5 volts. The network consists of some modules with "bias" and some with "termination".

Bias is the part of the voltage divider network which places both BUS "+" and BUS "-" at 2.5 volts. Termination is the part of the circuitry required to complete the voltage divider network and also provide some electromagnetic protection for the CCD BUS. Terminations in all CCD applications have approximately 120 ohms resistance.

ELECTRONIC INSTRUMENT CLUSTER

The electronic instrument cluster includes a digital speedometer, odometer, oil pressure gauge, Engine Coolant Temperature (ECT) gauge, fuel gauge, voltage gauge and a series of warning lights. Electronic instrument cluster receives all of its information for its displays from the Body Control Module (BCM) and the Powertrain Control Module (PCM) by means of CCD BUS system.

SELF-DIAGNOSTIC SYSTEM

Use diagnostic tests listed in this article when using DRB.

PRETEST INSPECTION

Before proceeding with diagnosis, the following precautions must be followed

1. Vehicle must have a fully charged battery and functional charging system.
2. Always start at TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS. Starting with any other test may result in incorrect results.
3. Only perform test steps indicated. It is NOT necessary to perform all steps in a test.
4. VEHICLE COMMUNICATIONS tests should only be used when instructed to do so by another test. Always start at TEST 1A.
5. Always perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) after repairs are completed.
6. Turn ignition switch to OFF position before disconnecting or connecting module connector.
7. At end of each test step, reconnect all wires and install any components removed for testing.
8. Use extreme care when connecting or disconnecting wiring during testing to prevent accidental grounding or shorting.
9. DO NOT use a test light in place of a voltmeter.
10. Always disconnect DRB after use.
11. Always disconnect DRB before charging battery.

DIAGNOSTIC PROCEDURE

Note. Before proceeding with diagnosis, certain precautions must be followed. See PRETEST INSPECTION under SELF-DIAGNOSTIC SYSTEM.

Diagnostic test procedures are designed to detect system faults as quickly as possible. Body trouble codes are accessed through CCD BUS Data Link Connector (DLC). (Scheme 42) DRB tester is used to access information from CCD BUS DLC. See ENTERING ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.

DRB tester, jumper wires and volt-ohmmeter will be needed for testing. See TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS under SELF-DIAGNOSTIC TESTS. Ensure self-diagnostic tests apply to vehicle being tested. When system problem is identified according to customer's complaint, perform indicated diagnostic test.

ENTERING ON-BOARD DIAGNOSTICS

Note. While using DRB scan tool, if an error is made or technician is unaware of correct procedures, enter "F1" (Help) or HOW TO USE DRB III from various menus.

1. Before entering on-board diagnostics, see PRETEST INSPECTION. Turn all accessories off. Turn ignition off. Attach appropriate 1994 cartridge to DRB. Connect DRB to Data Link Connector (DLC). DLC is located under left side of dash. (Scheme 42) Turn ignition on.
2. Start engine (if possible). With foot on brake, move transmission shift lever through all positions, ending in Park (A/T) or Neutral (M/T). Turn A/C switch on and then off (if equipped).
3. Turn engine off. Without starting engine again, turn ignition on. Enter selection No. 1, STAND ALONE DRB-III. Enter selection No. 1, CHRYSLER DOMESTIC. Enter selection No. 1, ENGINE. Proceed until READ DTCS selection is offered. After trouble codes are accessed, go to «TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-1a-identifying-vehicle-equipment) to diagnose problem.
4. To erase trouble codes while in this mode, press BACK key. At DRB display, scroll to YES - ERASE FAULTS. A confirmation message should then appear, FAULTS ERASED.

CLEARING TROUBLE CODES

Trouble codes can be cleared by disconnecting negative battery cable for at least 15 seconds, allowing computer system to clear trouble codes. Trouble codes can also be cleared using DRB. See step 4) in ENTERING ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.

ELECTRONIC INSTRUMENT CLUSTER (EIC) ACTUATOR TESTS

After ACTUATOR TESTS is selected from ELEC CLUSTER menu, display will change to ACTUATOR TEST and tests available for technician to diagnose. Select appropriate test. DRB will then display a menu for specific test. To determine whether or not any of these tests pass or fail, observe EIC display as test is being actuated. Following tests can be accessed from menu

1. INTERNAL CHECK

This tests the internal functions of EIC. This test also displays any trouble codes present.

1. ALL SEGMENTS ON

This test turns on all segments of EIC and then turns them off. If all segments do not glow and then turn off, test is failed.

1. SEQUENTIAL SEGMENTS TEST

This test illuminates all vacuum fluorescent bars on all gauges in EIC and then turns them off. If any bar fails to glow, test is failed.

1. SEQUENTIAL LEGENDS TEST

This test illuminates all legends in EIC individually and then turns them off. If any legend fails to glow or if 2 legends are illuminated together, test is failed.

DRB PROBLEMS & ERROR MESSAGES

For DRB problems and/or for error messages, proceed to VEHICLE COMMUNICATIONS test procedures in this article. Always start at TEST 1A - TROUBLE CODES . Testing of NO RESPONSE messages may be found in TEST 48A in this article.

BODY CONTROL SYSTEM CONNECTORS

Note. For terminal identification of body control system connectors (Scheme 43)-17. Connector terminal numbers are molded into connectors. If connector terminal identification differs from what is shown in figure, use wire colors to ensure correct circuit is being tested. For wiring diagrams, see WIRING DIAGRAMS at the end of this article.

CONNECTOR IDENTIFICATION DIRECTORY

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

SELF-DIAGNOSTIC TESTS

Note. In the following self-diagnostic tests, illustrations are courtesy of Chrysler Corp.

Note. When directed to go to next step, disregard step if vehicle is not equipped with module being tested. See MODULE APPLICATIONS under IDENTIFICATION in this article.

TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Connect DRB to Chrysler Collision Detection (CCD) Data Link Connector (DLC). Turn ignition on. Using DRB, select BODY SYSTEM.
2. If DRB does not display BUS OPERATIONAL, see «VEHICLE COMMUNICATIONS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__vehicle-communications-tests) in this article. If DRB displays BUS OPERATIONAL, go to next step.
3. If vehicle is equipped with a Mechanical Instrument Cluster (MIC), go to next step. Using DRB, select Electronic Instrument Cluster (EIC). If DRB displays NO RESPONSE, go to «TEST 48A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-48a-electronic-instrument-cluster) . If DRB does not display NO RESPONSE, go to step 5).
4. Using DRB, select Mechanical Instrument Cluster (MIC). If DRB displays NO RESPONSE, replace Body Control Module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display NO RESPONSE, go to next step.
5. Using DRB, select body computer. If DRB displays NO RESPONSE, go to «TEST 49A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-49a-repairing-body-control) . If DRB does not display NO RESPONSE, go to next step.
6. Using DRB, select compass mini-trip module (if equipped). If DRB displays NO RESPONSE, go to «TEST 50A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-50a-compassmini-trip-module) . If DRB does not display NO RESPONSE, go to next step.
7. Using DRB, select Powertrain Control Module (PCM). If DRB displays NO RESPONSE, go to «TEST 51A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-51a-repairing-pcm-no) . If DRB does not display NO RESPONSE, go to next step.
8. Using DRB, read trouble codes. If DRB does not display any trouble code, see appropriate TC TEST for specific diagnosis. If DRB displays NO VOLTAGE AT PIN 16 OF BODY COMPUTER, go to «TEST 49A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-49a-repairing-body-control) . If DRB displays EEPROM CHECKSUM FAILURE, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays, WRONG BODY COMPUTER, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

DIAGNOSTIC TEST DIRECTORY (1)

TEST 2A - ELECTRONIC INSTRUMENT CLUSTER (EIC) DIAGNOSTICS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition on. If Electronic Instrument Cluster (EIC) display is blank, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
2. If EIC display is not blank, close all doors. Turn ignition off. Wait one minute and open left front door. If EIC does not illuminate, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) .
3. If EIC illuminates, read EIC trouble codes using DRB. If DRB displays any trouble codes, go to «TEST 3A - ELECTRONIC INSTRUMENT CLUSTER (EIC) TROUBLE CODES»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-3a-electronic-instrument-cluster) .
4. If DRB does not display any trouble codes, read CLUSTER ID status using DRB. If DRB displays EIC/US, go to «TEST 4A - ELECTRONIC INSTRUMENT CLUSTER (EIC) PROBLEMS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-4a-electronic-instrument-cluster) . If DRB does not display EIC/US, go to «TEST 2B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-2b-electronic-instrument-cluster) .

TEST 2B - ELECTRONIC INSTRUMENT CLUSTER (EIC) DIAGNOSTICS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect EIC connector. Turn ignition on. Using DRB, read CLUSTER ID status. If DRB displays, EIC/US. Replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
2. If DRB does not display EIC/US, turn ignition off. Gain access to Body Control Module (BCM), located under left side of instrument panel. Disconnect BCM connectors.
3. Using DRB in ohmmeter mode, check resistance of ID line No. 1 circuit at Natural BCM connector terminal No. 10 (Orange/Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in Orange/Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. If resistance is more than 5 ohms, check resistance of ID line No. 2 circuit at Natural BCM connector terminal No. 12 (Light Blue wire). If resistance is less than 5 ohms, repair short to ground in Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 3A - ELECTRONIC INSTRUMENT CLUSTER (EIC) TROUBLE CODES

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Observe the DRB screen for trouble codes. Read and note trouble codes displayed. Perform corresponding procedure/test as indicated in the INSTRUMENT CLUSTER TROUBLE CODES TABLE 1 below. Perform TEST VER-1B after each repair.

INSTRUMENT CLUSTER TROUBLE CODES

TEST 4A - ELECTRONIC INSTRUMENT CLUSTER (EIC) PROBLEMS

1. Identify faulty area of instrument cluster and perform corresponding test(s). See «INSTRUMENT CLUSTER TROUBLE CODES TABLE 2»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) . INSTRUMENT CLUSTER TROUBLE CODES Trouble Code Perform TEST Faulty Speedometer Or Odometer «TEST 4B - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-4b-eic-speedometerodometer-failure) Faulty Switch (Trip, US/Metric Or Reset) «TEST 4C - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-4c-eic-switch-operation) Faulty Gauge(s) «TEST 5A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-5a-eic-identifying-faulty) Faulty Warning Light «TEST 7A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-7a-eic-identifying-faulty) Faulty Cluster Illumination «TEST 8A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8a-eic-or-compassmini-trip)
2. If problem exists in area of instrument cluster other than those listed in INSTRUMENT CLUSTER TROUBLE CODES table, use DRB to select EIC SEQUENTIAL LEGENDS test. If any legends of EIC fail to illuminate or 2 segments illuminate at the same time (test fails), replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If test passes, system is operating properly at this time. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 4B - EIC SPEEDOMETER/ODOMETER FAILURE

1. Using DRB, select EIC SEQUENTIAL LEGENDS test. If any legends of EIC fail to illuminate or 2 illuminate at the same time (test fails), replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
2. If test passes, stop actuation test using DRB. Raise vehicle on hoist and start engine. Place gear selector in Drive (A/T) or 1st gear (M/T). Using DRB, read Vehicle Speed Sensor (VSS) signal. If VSS signal does not increase smoothly with acceleration, see appropriate ELECTRONIC INSTRUMENT PANELS article in ACCESSORIES/SAFETY EQUIPMENT section.
3. If VSS signal increases smoothly with acceleration, check if problem is with odometer only. If problem is not with odometer only, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If problem is with odometer only, replace body control module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 4C - EIC SWITCH OPERATION

1. Using DRB, read EIC TRIP switch status. If DRB displays CIRCUIT CLOSED, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT CLOSED, go to next step.
2. Press TRIP button on EIC. If DRB does not display CIRCUIT CLOSED, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays CIRCUIT CLOSED, go to next step.
3. Release TRIP button. Using DRB, read EIC US/METRIC switch status. If DRB displays CIRCUIT CLOSED, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT CLOSED, go to next step.
4. Press and hold US/METRIC button on EIC. If DRB does not display CIRCUIT CLOSED, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays CIRCUIT CLOSED, go to next step.
5. Release US/METRIC button. Using DRB, read EIC TRIP RESET switch status. If DRB displays CIRCUIT CLOSED, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT CLOSED, go to next step.
6. Press and hold TRIP RESET button on EIC. If DRB does not display CIRCUIT CLOSED, replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays CIRCUIT CLOSED, system is operating properly at this time. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 5A - EIC IDENTIFYING FAULTY GAUGE(S)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, select SEQUENTIAL SEGMENT test. If any segments of EIC fail to illuminate or 2 illuminate at the same time (test fails), replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If test passes, go to next step.
2. If temperature gauge is not operating correctly, stop actuation test and go to «TEST 6A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-6a-eic-repairing-temperature) . If temperature gauge is operating correctly, go to next step.
3. If fuel gauge is not operating correctly, go to «TEST 45A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-45a-repairing-fuel-level) . If fuel gauge is operating correctly, go to next step.
4. If oil pressure gauge is not operating correctly, go to «TEST 46A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46a-repairing-oil-pressure) . If oil pressure gauge is operating correctly, go to next step.
5. If voltage gauge is not operating properly, select ENGINE CONTROLLER SYSTEMS TEST using DRB. If DRB displays ENGINE ACTIVE ON THE BUS, see appropriate ALTERNATORS & REGULATORS article in ELECTRICAL section. If DRB does not display ENGINE ACTIVE ON THE BUS, go to «TEST 51A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-51a-repairing-pcm-no) .

TEST 6A - EIC REPAIRING TEMPERATURE GAUGE PROBLEMS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure cooling system is operating properly. If cooling system is not operating properly, repair as needed. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If cooling system is operating properly, go to next step.
2. Using DRB, read engine temperature sensor voltage. If voltage is more than 10 volts, go to step 6). If voltage is less than 10 volts, go to next step.
3. Disconnect Engine Coolant Temperature (ECT) sensor connector. Check, clean and repair connections as needed. Using DRB, read ECT sensor voltage. If voltage is more than 10 volts, replace ECT sensor. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
4. Turn ignition off. Gain access to Body Control Module (BCM), located under left side of instrument panel. Disconnect BCM connectors. Turn ignition on. Using DRB in voltmeter mode, measure voltage of fused ignition feed circuit at Blue BCM connector terminal No. 12 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire between BCM and splice. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
5. Turn ignition off. Using DRB in ohmmeter mode, check resistance of ECT sensor signal circuit at Natural BCM connector terminal No. 23 (Violet/Yellow wire). If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair Violet/Yellow wire for short to ground. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Disconnect ECT sensor connector. Check and clean connections. Connect a jumper wire between ECT sensor connector (Violet/Yellow wire) and ground. Using DRB in voltmeter mode, read ECT sensor voltage. If voltage is less than one volt, replace ECT sensor. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
7. Disconnect jumper wire. Gain access to Body Control Module (BCM), located under left side of instrument panel. Connect jumper wire between ECT sensor signal circuit at Natural BCM connector terminal No. 23 (Violet/Yellow wire) and ground. Using DRB, read ECT sensor voltage. If voltage is less than one volt, repair open Violet/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
8. Disconnect jumper wire. Disconnect Blue BCM connector. Check, clean and repair connections as needed. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connections are okay, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 7A - EIC IDENTIFYING FAULTY WARNING LIGHT

Note. For wiring diagrams, see WIRING DIAGRAMS in this article.

1. Ensure parking brake is released and all doors are closed. Start engine. If an oil pressure or engine temperature gauge problem exists, go to «TEST 5A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-5a-eic-identifying-faulty) . If no oil pressure or engine temperature gauge problem exists, go to next step.
2. Using DRB, select SEQUENTIAL LEGENDS test. Sequential legends test should turn every warning light on and then off, one at a time (test passes). If sequential legends test fails, replace Electronic Instrument Cluster (EIC). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If sequential legends test passes, go to next step.
3. Determine which light is operating incorrectly and perform corresponding test(s) indicated in the WARNING LIGHT TEST table below. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) after each repair.

WARNING LIGHT TEST

TEST 8A - EIC OR COMPASS/MINI-TRIP ILLUMINATION TEST

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn park light switch to ON position. If park lights do not turn on, go to step 6). If park lights turn on, read panel light sensor voltage while moving dimmer control lever from LOW to HIGH position using DRB.
2. If DRB display changes from zero to 5 volts, proceed to «TEST 8C - REPAIRING SHORT»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8c-repairing-short-to) . If DRB display does not change from zero to 5 volts, go to next step.
3. Read panel light sensor voltage. If voltage is more than 4 volts, go to «TEST 8D - REPAIRING OPEN»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8d-repairing-open-in) . If voltage is less than 4 volts, remove and inspect fuse No. 9 in fuse block. If fuse is okay, go to «TEST 8F - REPAIRING OPEN»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8f-repairing-open-in) . If fuse is blown, go to next step.
4. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Using DRB in ohmmeter mode, check resistance of fuse park light relay output circuit (Tan wire) at Natural BCM connector terminal No. 16. If resistance is less than 5 ohms, repair short to ground in Tan wire and replace fuse No. 9. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace fuse No. 9. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Access left switch pod assembly. Disconnect left pod switch Blue connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
7. Using DRB in voltmeter mode, check voltage on park light relay control circuit at left pod switch Blue connector terminal No. 4 (Brown/Orange wire). If voltage is more than 10 volts, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
8. Remove and inspect fuse No. 2 in fuse block. If fuse is blown, go to «TEST 8E - REPAIRING SHORT»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8e-repairing-short-to) . If fuse is okay, reinstall fuse. Check voltage on battery feed circuit (Red/Black wire) to fuse No. 2. If voltage is less than 10 volts, repair open Red/Black wire between power distribution center and fuse block. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to «TEST 8B - REPAIRING PARK LIGHT OPERATION»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8b-repairing-park-light) .

TEST 8B - REPAIRING PARK LIGHT OPERATION

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove park light relay from relay block. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Reinstall fuse No. 2. Using an external ohmmeter, check resistance of park light relay control circuit (Brown/Orange wire) between Blue left pod switch connector terminal No. 4 and park light relay connector. If resistance is more than 5 ohms, repair open Brown/Orange wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Using DRB in voltmeter mode, check voltage on fused battery feed circuit (Pink/Red wire) at park light relay connector. If voltage is less than 10 volts, repair open Pink/Red wire between fuse No. 2 and relay connector. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
4. Check fused battery feed circuit (Pink/Red wire) at park light relay connector. If voltage is less than 10 volts, repair open Pink/Red wire between fuse No. 2 and relay connector. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
5. Connect a jumper wire between Pink/Red and Black/Yellow wire terminals at park light relay connector. If instrument cluster illuminates, replace park light relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If instrument cluster does not illuminate, go to next step.
6. Remove and inspect fuse No. 9. If fuse is okay, go to «TEST 8F - REPAIRING OPEN»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8f-repairing-open-in) . If fuse is blown, disconnect jumper wire. Using DRB in ohmmeter mode, check resistance of fused park light relay output circuit (Tan wire) at fuse No. 9 connector. If resistance is more than 5 ohms, replace fuse No. 9. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
7. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
8. Using DRB, check resistance of fused park light relay output circuit (Tan wire) at Natural BCM connector terminal No. 16. If resistance is less than 5 ohms, repair short to ground in Tan wire and replace fuse No. 9. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM and fuse No. 9. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 8C - REPAIRING SHORT TO GND IN POD SW CONTROL CIRCUITS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition on. Move dimmer switch to center of slide. If a problem exists with instrument cluster illumination only, go to next step. If a problem does not exist with instrument cluster illumination only, go to step 5).
2. Turn ignition off. Disconnect instrument cluster connector. Turn ignition on. Ensure park light switch is on. Using DRB in voltmeter mode, check voltage on panel lights driver circuit (Orange wire) at instrument cluster connector terminal No. 6. If voltage is less than 4 volts, repair open Orange wire between Body Control Module (BCM) and instrument cluster. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 4 volts, go to next step.
3. Using DRB in ohmmeter mode, check resistance of ground circuit (Black/Orange wire) at instrument cluster connector No. 14. If resistance is more than 5 ohms, repair open Black/Orange wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms and vehicle is equipped with Electronic Instrument Cluster (EIC), replace EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If vehicle is not equipped with EIC, go to next step.
4. Remove and inspect inoperative instrument cluster bulb(s). Replace bulbs if necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If bulbs are okay, replace instrument cluster. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . NOTE: Ensure Body Control Module (BCM) connectors remain connected in following step.
5. Using DRB in voltmeter mode, backprobe panel lights driver circuit (Orange wire) at Natural Body Control Module (BCM) connector terminal No. 19. If voltage is less than 4 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 4 volts, go to next step.
6. Turn ignition off. Disconnect Blue BCM connector. Using DRB in ohmmeter mode, check resistance of day brightness sense circuit (Yellow/Black wire) at Blue BCM connector terminal No. 6. If resistance is more than 5 ohms, go to step 8). If resistance is less than 5 ohms, go to next step.
7. Disconnect Black left pod switch connector. Check resistance of day brightness sense circuit (Yellow/Black wire) at Black left pod switch connector terminal No. 3. If resistance is more than 5 ohms, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Yellow/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
8. Turn park lights off. Remove and inspect inoperative instrument cluster bulb(s). Replace bulbs if necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If bulbs are okay, go to next step.
9. Using DRB in ohmmeter mode, check resistance of ground circuit (Black/Orange wire) at instrument cluster connector terminal No. 14. If resistance is more than 5 ohms, repair open Black/Orange wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair open Orange wire between BCM connector and inoperative instrument cluster bulb. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 8D - REPAIRING OPEN IN POD SWITCH CONTROL CIRCUITS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect both left pod switch connectors. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connectors, and clean or repair connectors as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connectors are okay, go to next step.
2. Using an external ohmmeter, check resistance of dimmer switch signal circuit (Orange/Black wire) between Black left pod switch connector terminal No. 1 and Natural BCM connector terminal No. 20. If resistance is more than 5 ohms, repair open in Orange/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Using DRB in ohmmeter mode, check resistance of ground circuit (Black wire) at Gray left pod switch connector terminal No. 1. If resistance is more than 5 ohms, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
4. Check resistance of ground circuit (Black wire) at Black left pod switch connector terminal No. 6. If resistance is more than 5 ohms, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 8E - REPAIRING SHORT TO GROUND IN PANEL LTS FEED CKT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Scheme 59

1. Turn ignition off. Remove park light relay from relay block. Using DRB in ohmmeter mode, check resistance of fused positive battery circuit (Pink/Red wire) at park light relay connector. If resistance is less than 5 ohms, repair short to ground in Pink/Red wire and replace fuse No. 2. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure). If resistance is more than 5 ohms, go to next step.
2. Using an external ohmmeter, check resistance across park light relay terminals. (Scheme 59) If resistance is less than 10 ohms, replace park light relay and fuse No. 2. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure). If resistance is more than 10 ohms, go to next step. (Scheme 59): Testing Relay (8E - Typical)
3. Install park light relay. Ensure park light switch is on. Remove and inspect fuse No. 2 in fuse block. If fuse is open, repair short to ground in Black/Yellow wire from relay block. replace fuse No. 2. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure). If fuse is okay, test is complete.

TEST 8F - REPAIRING OPEN IN PANEL LIGHTS FEED CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Reinstall fuse No. 9. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Using DRB in voltmeter mode, check voltage on fused park light relay output circuit (Tan wire) at Natural BCM connector terminal No. 16. If voltage is more than 10 volts, go to step 5). If voltage is less than 10 volts, go to next step.
3. Check voltage on park light relay output circuit (Black/Yellow wire) at fuse No. 9 connector. If voltage is more than 10 volts, repair open Tan wire between fuse No. 9 connector and BCM connector. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
4. Disconnect jumper wire at power distribution center. Using an external ohmmeter, check resistance of park light relay output circuit (Black/Yellow wire) between fuse No. 9 connector and park light relay connector. If resistance is more than 5 ohms, repair open Black/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace park light relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Disconnect left pod switch connectors. Using DRB in ohmmeter mode, check resistance of ground circuit (Black wire) at Black left pod switch connector terminal No. 6. If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
6. Check resistance of dimmer switch signal circuit (Orange/Black wire) at left pod switch connector terminal No. 1. If resistance is less than 5 ohms, repair short to ground in Orange/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
7. Using an external ohmmeter check resistance between terminals No. 1 (Orange/Black wire) and No. 6 (Black wire) at left pod switch. If while moving dimmer control from low to high, resistance does not range from less than 2000 ohms to more than 9000 ohms, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If while moving dimmer control from low to high, resistance ranges from less than 2000 ohms to more than 9000 ohms, go to next step.
8. Reconnect left pod switch connectors. Using DRB in ohmmeter mode, check resistance of dimmer switch signal circuit (Orange/Black wire) at Natural BCM connector terminal No. 20. If while moving dimmer control from low to high, resistance does not range from less than 2000 ohms to more than 9000 ohms, repair open Orange/Black wire between BCM and left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If while moving dimmer control from low to high, resistance ranges from less than 2000 ohms to more than 9000 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 9A - ELECTRO/MECHANICAL INSTRUMENT CLUSTER DIAGNOSTICS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Note. Electro/Mechanical Instrument Cluster (MIC) is an electronic cluster receiving information from CCD link and displaying information in analog gauges. These test procedures cover both base and premium MIC.

1. Using DRB, read instrument cluster I.D. status. If DRB displays EIC/US, go to next step. If DRB does not display EIC/US, identify instrument cluster problem and perform test as specified. See «INSTRUMENT CLUSTER PROBLEM DIRECTORY»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table. INSTRUMENT CLUSTER PROBLEM DIRECTORY Problem Perform TEST Defective Gauges «TEST 10A - FAULTY GAUGE»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-10a-faulty-gauge-on) Defective Odometer «TEST 11A - ELECTRO/MECH»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-11a-electromech-instrument-cluster) Defective Warning Lights «TEST 12A - FAULTY ELECTRO/MECH»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12a-faulty-electromech-instrument) Improper Cluster Illumination «TEST 8A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8a-eic-or-compassmini-trip)
2. Turn ignition off. Disconnect MIC connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
3. Turn ignition on. Connect a jumper wire between cluster ID line No. 1 circuit (Orange/Dark Blue wire) at MIC connector terminal No. 3 and ground. Using DRB, read CLUSTER ID status. If DRB does not display EIC/US, replace MIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays EIC/US, go to next step.
4. Disconnect jumper wire. Connect jumper wire between cluster ID line No. 2 circuit (Light Blue wire) at MIC connector terminal No. 5 and ground. If DRB does not display EIC/US, replace MIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays EIC/US, go to next step.
5. Disconnect jumper wire. Gain access to Body Control Module (BCM). BCM is located behind center console. Connect a jumper wire between cluster ID line No. 1 circuit (Orange/Dark Blue wire) at Natural BCM connector terminal No. 10 and ground. If DRB does not display EIC/US, repair open Orange/Dark Blue or Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays EIC/US, go to next step.
6. Connect a jumper wire between cluster ID line No. 2 circuit (Light Blue wire) at Natural BCM connector terminal No. 12 and ground. If DRB does not display EIC/US, repair open Light Blue. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays EIC/US, replace BCM.

TEST 10A - FAULTY GAUGE ON ELECTRO/MECH INSTRUMENT CLUSTER ID

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. If all gauges are inoperative, go to «TEST 12E - REPAIRING FAULTY»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12e-repairing-faulty-check) . If one or more gauge is okay, actuate faulty gauge in Electro/Mechanical Instrument Cluster (MIC) using DRB. This should actuate gauge from LO to HI, and then return it to its original position. If more than one gauge actuated, go to «TEST 10B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-10b-repairing-instrument-cluster) . If tested gauge did not actuate, go to «TEST 10C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-10c-repairing-open-gnd) .
2. If tested gauge did actuate, stop faulty gauge actuation test. Identify faulty gauge and go to appropriate test. See «FAULTY GAUGE TEST»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table. FAULTY GAUGE TEST Faulty Gauge Perform TEST Fuel Gauge «TEST 45A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-45a-repairing-fuel-level) Temperature Gauge «TEST 6A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-6a-eic-repairing-temperature) Speedometer «TEST 4B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-4b-eic-speedometerodometer-failure) Oil Pressure Gauge «TEST 46A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46a-repairing-oil-pressure) Voltage Gauge «TEST 14A - REPAIRING VOLTAGE»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-14a-repairing-voltage-gauge) Tachometer Gauge (1) (1) If tachometer is not functioning correctly, go to step 3).
3. Start engine. Using DRB, read engine RPM. If RPM is less than 400 RPM, refer to appropriate TESTS W/CODES article in this section. If RPM is more than 400 RPM, and tachometer head has not been replaced previously, replace tachometer head. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If tachometer head is not damaged and has been replaced before, replace MIC printed circuit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 10B - REPAIRING INSTRUMENT CLUSTER SENSE CIRCUITS (ELECTRONIC/MECHANICAL)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, stop actuation test. Turn ignition off. Disconnect Electro/Mechanical Instrument Cluster (MIC) connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Using an external ohmmeter, check resistance of MIC ID line No. 1 sense circuit (Orange/Dark Blue wire) between MIC connector terminal No. 3 and Natural Body Control Module (BCM) connector terminal No. 10. If resistance is more than 5 ohms, repair open Orange/Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Check resistance of MIC ID line No. 2 sense circuit (Light Blue wire) between MIC connector terminal No. 5 and Natural BCM connector terminal No. 12. If resistance is more than 5 ohms, repair open Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 10C - REPAIRING OPEN GND TO ELECTRO/MECH INST CLSTR

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, stop actuation test. Turn ignition off. Disconnect Electro/Mechanical Instrument Cluster (MIC) connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Using DRB in ohmmeter mode, check resistance of signal ground circuit (Black/Light Green wire) at MIC connector terminal No. 7. If resistance is more than 5 ohms, repair open Black/Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Remove faulty gauge and inspect MIC printed circuit. If MIC printed circuit is okay, replace faulty gauge. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If MIC printed circuit is defective, replace MIC printed circuit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 11A - ELECTRO/MECH INSTRUMENT CLUSTER ODOMETER FAILURE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, read trouble codes. If fault 08 (odometer test failure) exists, replace body control module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If fault 08 does not exist, turn ignition off. Disconnect Electro/Mechanical Instrument Cluster (MIC) connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Check if odometer is original equipment. If odometer assembly has not previously been replaced, replace odometer assembly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If odometer assembly has been replaced previously, replace MIC printed circuit board. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 12A - FAULTY ELECTRO/MECH INSTRUMENT CLUSTER WARNING LIGHT ID

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Note. A base Electro/Mechanical Instrument Cluster (MIC) has only 3 gauges.

1. If vehicle is equipped with a base MIC, go to «TEST 12B - FAULTY»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12b-faulty-electromech-instrument) . If vehicle is equipped with a premium MIC and CHECK GAUGES light is on at all times, go to «TEST 12D - REPAIRING FAULTY»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12d-repairing-faulty-check) . If vehicle is equipped with a premium MIC and CHECK GAUGES light is not on at all times, go to next step.
2. Using DRB, actuate sequential light test. If sequential light test does not pass, stop actuation test and go to «TEST 12C - REPAIRING INOPERATIVE»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12c-repairing-inoperative-warning) . If sequential light test passes, stop actuation test, identify faulty warning light, and perform test as indicated. See WARNING LIGHT TEST DIRECTORY below. WARNING LIGHT TEST DIRECTORY Defective Warning Light Perform TEST CHECK ENGINE (1) Door Ajar «TEST 13A - REPAIRING DOOR AJAR»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-13a-repairing-door-ajar) Liftgate Ajar «TEST 43A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-43a-diagnosing-door-ajar) Low Washer Fluid «TEST 44A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-44a-repairing-faulty-washer) Low Fuel (2) (1) See appropriate TESTS W/CODES article in this section. (2) Go to step 3).
3. Ensure gas tank has more than 3 gallons in it. If fuel light is not on at all times, replace Body Control Module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If fuel light is on at all times, turn ignition off and disconnect BCM connectors. Turn ignition on. If fuel light is still on, replace MIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If fuel light is off, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 12B - FAULTY ELECTRO/MECH INSTRUMENT CLSTR WARNING LT ID

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. While observing oil warning light, start engine. If oil light stays on, go to «TEST 46A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46a-repairing-oil-pressure) . If oil warning light stays off, go to TEST 12C. If oil warning light comes on and then goes out when engine starts, go to next step.
2. If CHECK GAUGES light is on at all times, go to «TEST 12E - REPAIRING FAULTY»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12e-repairing-faulty-check) . If CHECK GAUGES light is not on at all times, actuate sequential light test using DRB. If sequential light test does not pass, stop actuation test and go to «TEST 12C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-12c-repairing-inoperative-warning) . If sequential light test passes, stop actuation test. Identify faulty warning light, and perform test as indicated. See WARNING LIGHT TEST DIRECTORY below. WARNING LIGHT TEST DIRECTORY Defective Warning Light Perform TEST CHECK ENGINE (1) Door Ajar «TEST 13A - REPAIRING DOOR AJAR»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-13a-repairing-door-ajar) Low Washer Fluid «TEST 44A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-44a-repairing-faulty-washer) Liftgate Ajar «TEST 43A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-43a-diagnosing-door-ajar) Voltage (Battery Symbol) «TEST 14A - REPAIRING VOLTAGE»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-14a-repairing-voltage-gauge) Low Fuel (2) (1) See appropriate TESTS W/CODES article in this section. (2) Go to step 3).
3. Ensure gas tank has more than 3 gallons in it. If fuel light is not on at all times, replace Body Control Module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If fuel light is on at all times, turn ignition off and disconnect BCM connectors. Turn ignition on. If fuel light is still on, replace MIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If fuel light is off, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 12C - REPAIRING INOPERATIVE WARNING LIGHT

Turn ignition off. Remove Mechanical Instrument Cluster (MIC). Remove and inspect inoperative warning light bulb. Replace bulb if necessary. Perform TEST VER-1B . If bulb is okay, replace MIC printed circuit board. Perform TEST VER-1B .

TEST 12D - REPAIRING FAULTY CHECK GAUGES LAMP

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. If vehicle has coolant temperature, oil pressure or charging system problem, repair appropriate system. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If vehicle does not have coolant temperature, oil pressure or charging system problem, go to next step.
2. Turn ignition off. Disconnect Oil Pressure Sensor (OPS) connector. Start engine. If CHECK GAUGES light goes out, turn ignition off. Reconnect OPS connector. Go to «TEST 46A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46a-repairing-oil-pressure) . If CHECK GAUGES light is still on, go to next step.
3. Turn ignition off. Using DRB in ohmmeter mode, check resistance of OPS sense circuit (Gray wire) at OPS connector. If resistance is more than 5 ohms, replace Body Control Module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
4. Gain access to Body Control Module (BCM). BCM is located behind center console. Disconnect BCM connectors. Check resistance of OPS sense circuit (Gray wire) at Natural BCM connector. If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
5. Disconnect Mechanical Instrument Cluster (MIC) connector. Check resistance of OPS sense circuit (Gray wire) at Natural BCM connector. If resistance is more than 5 ohms, replace MIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Gray wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 12E - REPAIRING FAULTY CHECK GAUGES LAMP

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. If vehicle has coolant temperature, oil pressure or charging system problem, repair appropriate system. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If vehicle does not have coolant temperature, oil pressure or charging system problem, go to next step.
2. Turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) connector. Turn ignition on. Using DRB in voltmeter mode, check voltage on CCD bus positive circuit (Violet/Brown wire) at MIC connector terminal No. 10. If voltage is less than one volt, repair open Violet/Brown wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
3. Check voltage on CCD bus negative circuit (White/Black wire) at MIC connector terminal No. 9. If voltage is less than one volt, repair open circuit in CCD bus negative wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
4. Using DRB in ohmmeter mode, check resistance of signal ground circuit (Black/Light Green wire) at MIC connector terminal No. 7. If resistance is more than 5 ohms, repair open Black/Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
5. Using DRB in voltmeter mode, check voltage on fused ignition feed circuit (Dark Blue/White wire) at MIC connector terminal No. 11. If voltage is less than 10 volts, go to «TEST 48B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-48b-electronic-instrument-cluster) . If voltage is more than 10 volts, go to next step.
6. Check voltage on fused battery feed circuit (Pink wire) at MIC connector terminal No. 2. If voltage is less than 10 volts, replace MIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
7. Remove and inspect IOD fuse in Power Distribution Center (PDC). If fuse is blown, go to «TEST 48D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-48d-repairing-instrument-cluster) . If fuse is okay, go to next step.
8. Reinstall IOD fuse. Check voltage on battery feed circuit (Black/Red wire) at IOD fuse connector in PDC. If voltage is less than 10 volts, repair open Black/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, repair or replace PDC as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 13A - REPAIRING DOOR AJAR WARNING LIGHT

1. Ensure all doors and liftgate are adjusted and aligned. Close all doors. Using DRB, read left front door ajar switch status. If DRB displays CIRCUIT CLOSED, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB does not display CIRCUIT CLOSED, open left front door. If DRB does not display CIRCUIT CLOSED, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB displays CIRCUIT CLOSED, go to next step.
2. Using DRB, read right front door ajar switch status. If DRB displays CIRCUIT CLOSED, go to «TEST 41A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-41a-diagnosing-door-ajar) . If DRB does not display CIRCUIT CLOSED, open right front door. If DRB does not display CIRCUIT CLOSED, go to «TEST 41A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-41a-diagnosing-door-ajar) . If DRB displays CIRCUIT CLOSED, go to next step.
3. Using DRB, read side door ajar switch status. If DRB displays CIRCUIT CLOSED, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) . If DRB does not display CIRCUIT CLOSED, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) to diagnose a short in side door ajar circuit.

TEST 14A - REPAIRING VOLTAGE GAUGE OR VOLTAGE LIGHT PROBLEM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Using DRB in voltmeter mode, check voltage on fused battery feed circuit (Pink wire) at Blue BCM connector terminal No. 16. If voltage is less than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 15A - DIAGNOSING COMPASS/MINI-TRIP MODULE TROUBLE CODES

Press step button one time. If compass/mini-trip screen is still blank, go to TEST 15B . If compass/mini-trip screen is not blank, test is complete. Perform TEST VER-1B .

TEST 15B - REPAIRING COMPASS/MINI-TRIP MODULE BLANK SCREEN

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Press step button one time. If compass/mini-trip screen is not blank, test is complete. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If compass/mini-trip screen is still blank, go to next step.
2. Gain access to compass/mini-trip module connector. Using DRB in voltmeter mode, backprobe fused ignition feed circuit (Tan wire) at compass/mini-trip module connector terminal No. 7. If voltage is less than 10 volts, go to step 5). If voltage is more than 10 volts, go to next step.
3. Turn ignition off. Disconnect compass/mini-trip module connectors. Check connectors, and clean or repair connectors as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connectors are okay, go to next step.
4. Using DRB in ohmmeter mode, check resistance of system ground circuit (Black/Light Green wire) at compass/mini-trip module connector terminal No. 5. If resistance is more than 5 ohms, repair open Black/Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to «TEST 15C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-15c-diagnosing-blank-screenbuttons) .
5. Remove circuit breaker No. 25 from fuse panel. Using DRB in voltmeter mode, check voltage on fuse No. 25 connector, ignition switch output circuit (Black/White wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open Black/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Disconnect compass/mini-trip module connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
7. Using DRB in ohmmeter mode, check resistance of fused ignition feed circuit (Tan wire) at circuit breaker No. 25. If resistance is less than 5 ohms, repair short to ground in Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace circuit breaker. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 15C - DIAGNOSING BLANK SCREEN/BUTTONS ON COMPASS/MINI-TRIP MODULE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Reconnect compass/mini-trip module connectors. Disconnect compass/mini-trip module 5-pin button assembly connector. (Scheme 60) Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure). If connector is okay, go to next step.
2. Turn ignition on. Momentarily connect a jumper wire between compass/mini-trip module 5-pin button assembly terminals No. 1 and No. 2. If compass/mini-trip screen is still blank, replace compass/mini-trip module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure). If compass/mini-trip screen is not blank, replace button assembly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure).

Locating & Identifying Compass/Mini-Trip Module 5-Pin Button Assembly Conn. Terminals (15C). Scheme 60

Note. Test sequence skips from TEST 15C to TEST 19A. No test procedures have been omitted.

TEST 19A - IDENTIFYING POWER DOOR LOCK PROBLEMS

1. If vehicle is equipped with Remote Keyless Entry (RKE) go to «TEST 20A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20a-power-door-lock) . Diagnostics for power door locks for vehicles not equipped with RKE, are separated into 9 groups. Verify failure(s) or customer complaint and ensure vehicle is experiencing failure(s) or complaint at this time. Go to next step.
2. Lower both front door windows. Close all doors. Lock and unlock doors from both front door switches. If doors lock and unlock properly, go to next step. If doors fail to lock or unlock properly, see «DIAGNOSING POWER DOOR LOCK CIRCUIT»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table, and perform appropriate test. DIAGNOSING POWER DOOR LOCK CIRCUIT Problem Perform TEST All Doors Fail To Lock & Unlock From Any Switch «TEST 19B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19b-diagnosing-door-lock) All Doors Fail To Lock & Unlock From One Switch «TEST 19C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19c-diagnosing-door-lock) All Doors Fail To Lock From Any Switch «TEST 19D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19d-diagnosing-door-lock) All Doors Fail To Lock From One Switch «TEST 19E»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19e-diagnosing-door-lock) All Doors Fail To Unlock From Any Switch «TEST 19F»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19f-diagnosing-door-unlock) All Doors Fail To Unlock From One Switch «TEST 19G»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19g-diagnosing-door-unlock) One Door Fails To Lock & Unlock From Any Switch «TEST 19H»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19h-diagnosing-door-lockunlock)
3. Turn ignition off, but leave key in ignition switch. Open left front door. Lock doors from either switch. If doors lock, go to «TEST 39B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-39b-diagnosing-no-chime) . If doors do not lock, and vehicle is equipped with speed sensitive locks, go to next step. If vehicle is not equipped with speed sensitive locks, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. Drive vehicle with all doors closed and unlocked. Reach a speed of 15 MPH. If doors fail to lock, go to «TEST 19J»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19j-diagnosing-door-lock) . If doors lock, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 19B - DIAGNOSING DOOR LOCK & UNLOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Lower both front door windows. Using DRB, actuate door locks. If doors do not lock, go to step 5). If doors lock, go to next step.
2. Turn ignition off. Remove and inspect IOD fuse from Power Distribution Center (PDC). If fuse is blown, go to «TEST 28C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-28c-diagnosing-courtesy-light) . If fuse is okay, go to next step.
3. Using DRB in voltmeter mode, check voltage on battery feed circuit (Black/Red wire) to IOD fuse in PDC. If voltage is less than 10 volts, repair Black/Red wire as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
4. Reinstall IOD fuse. Remove driver's door panel to gain access to left door lock switch. Using DRB in voltmeter mode, backprobe fused battery feed circuit (Pink wire) at left door lock switch. If voltage is less than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace left door lock switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Turn ignition off. Remove and inspect fuse No. 10 from fuse panel. If fuse is blown, go to step 8). If fuse is okay, go to next step.
6. Using DRB in ohmmeter mode, check resistance of battery feed circuit (Red/White wire) to fuse No. 10 connector. If resistance is less than 5 ohms, repair short to ground in Red/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
7. Remove door lock and door unlock relays from micro relay center, located behind center console. Door lock relay is fourth relay from right, bottom row. Door unlock relay is third relay from right, bottom row. Disconnect remote keyless entry module connector (if equipped). Using DRB in ohmmeter mode, check resistance of lock relay output circuit (Orange/Black wire) at lock relay connector. If resistance is less than 5 ohms, repair short to ground in Orange/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace fuse No. 10. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
8. Using DRB in voltmeter mode, check voltage on battery feed circuit (Red/White wire) to fuse No. 10 in fuse panel. If voltage is less than 10 volts, repair Red/White wire as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
9. Reinstall fuse No. 10. Remove door lock and door unlock relays from micro relay center located behind center, console. Door lock relay is fourth relay from right, bottom row. Door unlock relay is third relay from right, bottom row. Using DRB in voltmeter mode, check voltage on battery feed circuit (Red/White wire) to fuse No. 10 in fuse panel. If voltage is less than 10 volts, repair open Red/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
10. Using an external ohmmeter, check resistance between door lock relay connector terminal "A" (Orange/Black wire) and door unlock relay connector terminal "A" (Pink/Black wire). If resistance is more than 5 ohms, repair Orange/Black wire or Pink/Black wire as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
11. Using DRB in ohmmeter mode, check resistance of all ground circuits (Black wires) at door lock relay connector and door unlock relay connector. If resistance is more than 5 ohms on any circuit, repair appropriate open circuit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms on all circuits, replace door lock and door unlock relays. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 19C - DIAGNOSING DOOR LOCK & UNLOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Remove appropriate door panel to gain access to inoperative door lock switch. Using DRB in voltmeter mode, backprobe fused battery feed circuit (Pink wire) at door lock switch. If voltage is less than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
2. Backprobe switched door lock output circuit (Orange/Violet wire) at door lock switch. Observe DRB while depressing power door lock switch to LOCK position. If voltage is less than 10 volts when switch is depressed, replace defective door lock switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
3. Backprobe switched door unlock output circuit (Pink/Violet wire) at door lock switch. Observe DRB while depressing power door lock switch to LOCK position. If voltage is less than 10 volts when switch is depressed, replace defective door lock switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts when switch is depressed, repair open Pink/Violet wire and Orange/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 19D - DIAGNOSING DOOR LOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, actuate door locks. If doors do not lock, go to step 4). If doors lock, turn ignition off and remove key. Go to next step. NOTE: Ensure left front door remains open in following step.
2. Using DRB, read key-in ignition status. If DRB does not display KEY IN IGN:OPEN, go to «TEST 39B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-39b-diagnosing-no-chime) . If DRB displays KEY IN IGN:OPEN, go to next step.
3. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in voltmeter mode, check voltage on switched battery feed circuit (Orange/Violet wire) at Blue BCM connector terminal No. 8. Observe DRB voltage while depressing each power door lock switch to LOCK position. If voltage is more than 10 volts when each switch is depressed, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts when each switch is depressed, repair open Orange/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. Stop door lock actuation. Gain access to Body Control Module (BCM). BCM is located behind center console. Using DRB in voltmeter mode, backprobe door lock relay control circuit (Orange/White wire) at Blue BCM connector terminal No. 17. If voltage does not pulsate between zero and more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage pulsates between zero and more than 10 volts, go to next step.
5. Stop door lock actuation. Remove door lock relay (fourth relay from right, bottom row) from micro relay center, located behind center console. Check voltage on door lock relay control circuit (Orange/White wire) at door lock relay connector. Using DRB, actuate door locks while observing DRB voltage. If voltage does not pulsate between zero and more than 10 volts, repair open Orange/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage pulsates between zero and more than 10 volts, go to next step.
6. Stop door lock actuation. Using DRB in voltmeter mode, check voltage on fused battery feed circuit (Red wire) at door lock relay connector. If voltage is less than 10 volts, repair open Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
7. Using DRB in ohmmeter mode, check resistance of lock relay ground circuit (Black wire) at door lock relay connector terminal "E". If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step. NOTE: Ensure door unlock relay is installed in following step.
8. Check resistance of door lock relay output circuit (Orange/Black wire) at door lock relay connector (Orange/Black wire). If resistance is less than 5 ohms, replace door lock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
9. Remove door unlock relay (third relay from right, bottom row) from micro relay center, located behind center console. Using DRB in ohmmeter mode, check resistance of system ground circuit (Black wire) at door unlock relay connector terminal "D". If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace door unlock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 19E - DIAGNOSING DOOR LOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Gain access to inoperative door lock switch. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Go to next step.
2. Using an external ohmmeter, check resistance of door lock switch output lock circuit (Orange/Violet wire) between Blue BCM connector terminal No. 8 (Orange/Violet wire) and power lock switch. If resistance is more than 5 ohms, repair open Orange/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace open door lock switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 19F - DIAGNOSING DOOR UNLOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove door unlock relay (third relay from right, bottom row) from micro relay center, located behind center console. Using DRB in voltmeter mode, check voltage on door lock switch output unlock circuit (Pink/Violet wire) at door unlock relay connector. Observe DRB voltage while depressing each power door lock switch to UNLOCK position. If voltage is less than 10 volts when each switch is depressed, repair open Pink/Violet wire. Perform test VER-1B. If voltage is more than 10 volts when each switch is depressed, go to next step.
2. Check voltage on fused battery feed circuit (Red wire) at door unlock relay connector. If voltage is less than 10 volts, repair open Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
3. Using DRB in ohmmeter mode, check resistance of unlock relay ground circuit (Black wire) at door lock relay connector terminal "E". If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
4. Ensure door lock relay is installed (fourth relay from right, bottom row). Using DRB in ohmmeter mode, check resistance of unlock relay output circuit (Pink/Black wire) at door unlock relay connector. If resistance is less than 5 ohms, replace door unlock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms go to next step.
5. Remove door lock relay. Check resistance of system ground circuit (Black wire) at door lock relay connector terminal "D". If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace door lock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 19G - DIAGNOSING DOOR UNLOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Turn ignition off. Gain access to inoperative door lock switch. Remove door unlock relay (third relay from right, bottom row) from micro relay center, located behind center console. Using an external ohmmeter, check resistance of door lock switch unlock output circuit (Pink/Violet wire) between door unlock relay connector and door lock switch. If resistance is more than 5 ohms, repair open Pink/Violet wire. Perform TEST VER-1B . If resistance is less than 5 ohms, replace door lock switch. Perform TEST VER-1B .

TEST 19H - DIAGNOSING DOOR LOCK/UNLOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. If problem is with sliding side door lock, check door contacts before proceeding. Repair door contacts as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If contacts are okay and on all other doors, go to next step.
2. Turn ignition off. Gain access to inoperative door lock switch. Disconnect door lock motor connector. Using DRB in voltmeter mode, check voltage on door lock relay output circuit (Orange/Black wire) at door lock switch connector.
3. Observe DRB while depressing door lock switch to lock position. If voltage is less than 10 volts, repair open Orange/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
4. Check voltage on door unlock relay output circuit (Pink/Black wire) at door lock switch connector. Observe DRB while depressing door lock switch to unlock position. If voltage is less than 10 volts, repair open Pink/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace door lock motor. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

Note. Test sequence skips from TEST 19H to TEST 19J. No test procedures have been omitted.

TEST 19J - DIAGNOSING DOOR LOCK CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, read door locks status. If DRB does not display AUTO DOOR LOCKS ARE ENABLED, use DRB to enable door locks and retest system. If DRB displays AUTO DOOR LOCKS ARE ENABLED, go to next step.
2. Using DRB, actuate door locks. If doors do not lock, go to «TEST 19A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19a-identifying-power-door) . If doors lock, ensure left front door is closed. Using DRB, read door ajar switch status. If DRB does not display LF DOOR AJAR:OPEN, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB displays LF DOOR AJAR:OPEN, go to next step.
3. Ensure right front door is closed. Read door ajar switch status. If DRB does not display RF DOOR AJAR:OPEN, go to «TEST 41A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-41a-diagnosing-door-ajar) . If DRB displays RF DOOR AJAR:OPEN, go to next step.
4. Ensure side door is closed. Read door ajar switch status. If DRB does not display SIDE DR AJR:OPEN, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) . If DRB displays SIDE DR AJR:OPEN, go to next step.
5. Ensure liftgate is closed. Read door ajar switch status. If DRB does not display GATE AJAR:OPEN, go to «TEST 43A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-43a-diagnosing-door-ajar) . If DRB displays GATE AJAR:OPEN, go to next step.
6. Read Body Control Module (BCM) monitors. If TPS percentage does not increase as throttle is opened, see appropriate TESTS W/CODES article in this section to diagnose TPS trouble codes. If TPS percentage increases as throttle is opened, go to next step.
7. Raise and support vehicle. Start engine and shift vehicle into Drive (1st gear on manual transmission). Using DRB, read BCM monitors. If MPH does not increase as throttle is opened, see appropriate TESTS W/CODES article in this section to diagnose VSS faults. If MPH increases as throttle is opened, turn ignition off and circuit is operating properly. Retest system.

TEST 20A - POWER DOOR LOCK PROBLEMS W/ RKE ID

1. Diagnostics for power door locks for vehicles equipped with Remote Keyless Entry (RKE), are separated into 17 groups. Verify failure(s) or customer complaint, and ensure vehicle is experiencing failure(s) or complaint at this time. Go to next step.
2. Lower both front door windows. Close all doors. Lock and unlock doors from both front door switches. If doors lock and unlock properly, go to next step. If doors fail to lock or unlock properly, see «DIAGNOSING RKE POWER DOOR LOCK CIRCUIT»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table, and perform appropriate test. DIAGNOSING RKE POWER DOOR LOCK CIRCUIT Problem Perform TEST All Doors Fail To Lock & Unlock From Any Switch «TEST 19B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19b-diagnosing-door-lock) All Doors Fail To Lock & Unlock From One Switch «TEST 19C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19c-diagnosing-door-lock) All Doors Fail To Lock From Any Switch «TEST 19D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19d-diagnosing-door-lock) All Doors Fail To Lock From One Switch «TEST 19E»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19e-diagnosing-door-lock) All Doors Fail To Unlock From Any Switch «TEST 19F»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19f-diagnosing-door-unlock) All Doors Fail To Unlock From One Switch «TEST 19G»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19g-diagnosing-door-unlock) One Door Fails To Lock & Unlock From Any Switch «TEST 19H»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19h-diagnosing-door-lockunlock) LF Door Fails To Lock & Unlock From Any Switch «TEST 20B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20b-repairing-power-door) LF Door Fails To Lock From Any Switch «TEST 20C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20c-repairing-power-door) LF Door Fails To Unlock From Any Switch «TEST 20D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20d-repairing-power-door) All Doors Except LF Fail To Lock & Unlock «TEST 20E»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20e-repairing-power-door) All Doors Except LF Fail To Lock «TEST 20F»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20f-repairing-power-door) All Doors Except LF Fail To Unlock «TEST 20G»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20g-repairing-power-door)
3. Using RKE transmitter, operate door locks and trunk. If door locks and trunk fail to operate, see owner's manual to check transmitter batteries or to program a known-good transmitter. If after programming and using a known-good transmitter, RKE still does not operate go to «TEST 20H»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-20h-repairing-power-door) . If RKE operates, go to next step.
4. Turn ignition off, but leave key in ignition switch. Open left front door. Lock doors from either switch. If doors lock, go to «TEST 39B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-39b-diagnosing-no-chime) . If doors do not lock, and vehicle is equipped with speed sensitive locks, go to 6next step. If vehicle is not equipped with speed sensitive locks, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Drive vehicle with all doors closed and unlocked. Reach a speed of 15 MPH. If doors fail to lock, go to «TEST 19J»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19j-diagnosing-door-lock) . If doors lock, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 20B - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

Note. RKE module may be accessed by carefully prying each end of instrument panel top cover and sliding cover forward to disengage front clips.

1. Gain access to Remote Keyless Entry (RKE) module. RKE module is located under instrument panel top cover, behind information center. Disconnect RKE module Black connector. Go to next step.
2. Using DRB in ohmmeter mode, check resistance of RKE ground circuit (Black wire) at RKE module Black connector. If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Connect a jumper wire between ground circuit (Black wire) and LF door unlock driver circuit (Dark Blue wire) at RKE module Black connector. Depress door lock switch to LOCK position. If LF door operates, replace RKE module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If LF door lock does not operate, go to next step.
4. Remove jumper wire. Using DRB in voltmeter mode, check voltage on battery feed circuit (Pink wire) at RKE module Black connector. If voltage is less than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
5. Check voltage on door lock switch lock output circuit (Orange/Violet wire) at RKE module Black connector. Depress door lock switch to LOCK position while observing DRB voltage. If voltage is less than 10 volts while switch is in LOCK position, repair open Orange/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
6. Check voltage on door lock switch unlock output circuit (Pink/Violet wire) at RKE module Black connector. Depress door lock switch to UNLOCK position while observing DRB voltage. If voltage is less than 10 volts while switch is in UNLOCK position, repair open Pink/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
7. Reconnect RKE module Black connector. Using DRB in voltmeter mode, backprobe LF door unlock driver circuit (Dark Blue wire) at RKE module connector. Depress door lock switch to UNLOCK position while observing DRB voltage. If voltage is less than 10 volts while switch is in UNLOCK position, replace RKE module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
8. Remove LF door panel. Disconnect LF door lock motor connector. Using DRB in voltmeter mode, check voltage on lock relay output circuit (Orange/Black wire) at LF door lock motor connector. If voltage is less than 10 volts, repair open Orange/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
9. Check voltage on LF door lock driver circuit (Dark Blue wire) at LF door lock motor connector. Depress door lock switch to UNLOCK position while observing DRB voltage. If voltage is less than 10 volts, repair open Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace door lock motor.

TEST 20C - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

Note. RKE module may be accessed by carefully prying each end of instrument panel top cover and sliding cover forward to disengage front clips.

1. Gain access to Remote Keyless Entry (RKE) module. RKE module is located under instrument panel top cover, behind information center. Disconnect RKE module Black connector. Go to next step.
2. Connect a jumper wire between ground circuit (Black wire) and LF door unlock driver circuit (Dark Blue wire) at RKE module Black connector. Depress door lock switch to LOCK position. If LF door operates, replace RKE module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If LF door lock does not operate, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 20D - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

Note. RKE module may be accessed by carefully prying each end of instrument panel top cover and sliding cover forward to disengage front clips.

1. Gain access to Remote Keyless Entry (RKE) module. RKE module is located under instrument panel top cover, behind information center. Disconnect RKE module Black connector. Go to next step.
2. Using DRB in voltmeter mode, check voltage on battery feed circuit (Pink wire) at RKE module Black connector. If voltage is less than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
3. Check voltage on door lock switch unlock output circuit (Pink/violet wire) at RKE module Black connector. Depress door lock switch to UNLOCK position while observing DRB voltage. If voltage is less than 10 volts while switch is in UNLOCK position, repair open Pink/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace RKE module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 20E - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

1. Remove door unlock relay (third relay from right, bottom row) from micro relay center, located behind center console. Using DRB in ohmmeter mode, check resistance of unlock relay output circuit (Pink/Black wire) at unlock relay connector. If resistance is more than 10 ohms, repair open Pink/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 10 ohms, go to next step.
2. Check resistance of both ground circuits (Black wires) at unlock relay connector. If resistance on either wire is more than 5 ohms, repair appropriate open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms on both wires, replace unlock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 20F - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

1. Remove door lock relay (fourth relay from right, bottom row) from micro relay center located behind center console. Using DRB in ohmmeter mode, check resistance of ground circuit (Black wire) at lock relay connector terminal "E". If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
2. Using DRB in voltmeter mode, check voltage on door lock relay control circuit (Orange/White wire) at door lock relay connector. Depress door lock switch to LOCK position while observing DRB voltage. If voltage is more than 10 volts, replace door lock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
3. Gain access to Body Control Module (BCM). BCM is located behind center console. Using DRB in voltmeter mode, backprobe door lock relay control circuit (Orange/White wire) at Blue BCM connector terminal No. 17. If voltage is more than 10 volts, repair open Orange/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 20G - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

1. Remove door unlock relay (third relay from right, bottom row) from micro relay center located behind center console. Using DRB in ohmmeter mode, check resistance of ground circuit (Black wire) at unlock relay connector terminal "E". If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
2. Using DRB in voltmeter mode, check voltage on door lock switch unlock output circuit (Pink/Violet wire) at door unlock relay connector. Depress door lock switch to UNLOCK position while observing DRB voltage. If voltage is more than 10 volts, replace door unlock relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair open Pink/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 20H - REPAIRING POWER DOOR LOCK PROBLEMS W/ RKE

Note. RKE module may be accessed by carefully prying each end of instrument panel top cover and sliding cover forward to disengage front clips.

1. Gain access to Remote Keyless Entry (RKE) module. RKE module is located under instrument panel top cover, behind information center. Disconnect RKE module Black connector. Go to next step.
2. Using DRB in voltmeter mode, check voltage on battery feed circuit (Pink wire) at RKE module Black connector. If voltage is less than 10 volts, repair open Pink wire. If voltage is more than 10 volts, go to next step.
3. Using DRB in ohmmeter mode, check resistance of RKE module program enable circuit (Dark Green wire) at RKE module Black connector. If resistance is less than 10 ohms, repair short to ground in Dark Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 10 ohms, go to next step.
4. Using DRB in voltmeter mode, check voltage on LF door unlock driver circuit (Dark Blue wire) at RKE module Black connector. Using DRB, actuate door lock relay while observing DRB voltage. If voltage is less than 10 volts, repair open Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
5. Check voltage on door lock switch unlock output circuit (Pink/Violet wire) at RKE module Black connector. Press door lock switch to UNLOCK position while observing DRB voltage. If voltage is less than 10 volts, repair open Pink/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
6. Check voltage on door lock switch lock output circuit (Orange/Violet wire) at RKE module Black connector. Press door lock switch to LOCK position while observing DRB voltage. If voltage is less than 10 volts, repair open Orange/Violet wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace RKE module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 21A - DIAGNOSING SIDE DOOR MEMORY LOCK

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition on and ensure left front door is open and side door is closed. Using DRB, actuate door locks. If side door does not lock, go to step 5). If side door locks, go to next step.
2. Stop door lock actuation. Ensure side door is closed and read door ajar switch status. If DRB does not display SIDE DR AJAR:OPEN, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) . If DRB displays SIDE DR AJAR:OPEN, go to next step.
3. Open side door. Read door ajar switch status. If DRB does not display SIDE DR AJAR:CLOSED, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) . If DRB displays SIDE DR AJAR:CLOSED, go to next step. NOTE: Left front door MUST remain open in following steps.
4. Turn ignition off and remove key. Using DRB, read key-in ignition status. If DRB does not display KEY IN IGN:OPEN, go to «TEST 39B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-39b-diagnosing-no-chime) . If DRB displays KEY IN IGN:OPEN, replace body control module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Stop the door lock actuation procedure. If the front doors do not lockproperly, proceed to «TEST 19A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19a-identifying-power-door) . If the front doors lock, proceed to «TEST 19H»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19h-diagnosing-door-lockunlock) .

TEST 22A - DIAGNOSING INTERMITTENT WIPER PROBLEM

Note. For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Diagnostics for windshield wiper system are separated into 4 groups. Verify failure(s) or customer complaint and ensure vehicle is experiencing failure(s) or customer complaint at this time. See DIAGNOSING INTERMITTENT WIPER PROBLEM table and perform appropriate test.

DIAGNOSING INTERMITTENT WIPER PROBLEM

TEST 23A - IDENTIFYING INTERMITTENT WIPER PROBLEM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, actuate wiper motor. If wipers operate during actuation, go to «TEST 23B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-23b-diagnosing-intermittent-wiper) . If wipers do not operate during actuation, gain access to Body Control Module (BCM). BCM is located behind center console. Go to next step.
2. Using DRB in voltmeter mode, backprobe intermittent wiper switch mode sense circuit (Dark Green wire) at Blue BCM connector terminal No. 24. While probe is connected, actuate wiper motor using DRB. If voltage pulsates from more than 10 volts to less than 5 volts, go to step 4). If voltage does not pulsate from more than 10 volts to less than 5 volts, go to next step.
3. Turn ignition off. Disconnect Blue BCM connector. Turn ignition on. Check voltage on wiper switch mode sense circuit (Dark Green wire) at Blue BCM connector terminal No. 24. If voltage is less than 10 volts, repair open Dark Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. Turn ignition off. Gain access to multifunction switch connector. Disconnect multifunction switch connector. Go to next step.
5. Turn ignition on. Using DRB in voltmeter mode, backprobe wiper switch mode sense circuit (Dark Green wire) at multifunction switch connector terminal No. 7. Using DRB, actuate wiper motor while observing DRB voltage. If voltage does not pulsate from more than 10 volts to less than 5 volts, repair open Dark Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage pulsates from more than 10 volts to less than 5 volts, go to next step.
6. Backprobe wiper switch mode sense circuit (Dark Green wire) at multifunction switch connector terminal No. 8. Using DRB, actuate wiper motor while observing DRB voltage. If voltage does not pulsate from more than 10 volts to less than 5 volts, repair open Dark Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage pulsates from more than 10 volts to less than 5 volts, replace multifunction switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 23B - DIAGNOSING INTERMITTENT WIPER PROBLEM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Gain access to Body Control Module (BCM). BCM is located behind center console. Disconnect Blue BCM connector. Turn ignition on. Go to next step.
2. Using DRB in voltmeter mode, check voltage on intermittent wiper level sense circuit at Blue BCM connector terminal No. 9 (Dark Green/Yellow wire). With probe connected, slide wiper switch to each intermittent mode. If voltage is present in each intermittent mode, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is not present in each intermittent mode, turn ignition off.
3. Disconnect multifunction switch. Using an external ohmmeter, check resistance of intermittent wiper level sense circuit (Dark Green/Yellow wire) between Blue BCM connector terminal No. 9 and multifunction switch connector terminal No. 1.
4. If resistance is less than 5 ohms, replace multifunction switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, repair open Dark Green/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 24A - DIAGNOSING WASHER PUMP PROBLEM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Check washer fluid level. Add fluid if necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If fluid level is okay, go to next step.
2. Ensure washer fluid lines and nozzles are undamaged and unrestricted. Repair lines and nozzles as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If lines and nozzles are okay, go to next step.
3. Disconnect washer pump motor connector. Using DRB in voltmeter mode, check voltage on washer pump control switch output circuit (Brown wire) at washer pump connector. Engage washers while observing DRB voltage. If voltage is more than 10 volts while engaging washers, go to step 5). If voltage is less than 10 volts while engaging washers, go to next step.
4. Gain access to multifunction switch connector. Check voltage on washer pump control switch output circuit (Brown wire) at multifunction switch connector terminal No. 3. With probe connected, engage washers. If voltage is more than 10 volts while engaging washers, repair open Brown wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts while engaging washers, replace multifunction switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Turn ignition off. Using DRB in ohmmeter mode, check resistance of ground circuit (Black wire) at washer pump connector. If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace washer pump motor. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 24B - DIAGNOSING WIPER PROBLEM DURING WASH CYCLE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Attempt to operate wipers in intermittent mode. If wipers do not operate in intermittent mode, go to «TEST 23A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-23a-identifying-intermittent-wiper) . If wipers operate in intermittent mode, go to next step.
2. Gain access to Body Control Module (BCM). BCM is located behind center console. Using DRB in voltmeter mode, backprobe washer pump switch output circuit (Brown wire) at Blue BCM connector terminal No. 10. With probe connected, engage washers. If voltage is more than 10 volts while engaging washers, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts while engaging washers, go to next step.
3. Gain access to multifunction switch connector. Backprobe washer pump control switch output circuit (Brown wire) at multifunction switch connector terminal No. 3. With probe connected, engage washers. If voltage is less than 10 volts while engaging switch, replace multifunction switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts while engaging washers, go to next step.
4. Turn ignition off. Disconnect multifunction switch connector. Disconnect Blue BCM connector. Using an external ohmmeter, check resistance of washer pump control switch output circuit (Brown wire) between Blue BCM connector terminal No. 10 and multifunction switch connector terminal No. 3. If resistance is more than 5 ohms, repair open Brown wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 24C - DIAGNOSING WIPER PARK SWITCH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Gain access to wiper motor connector. Using DRB in voltmeter mode, backprobe park switch sense circuit (Dark Green wire) at wiper motor connector. Go to next step.
2. Turn ignition on and wiper switch to LO position. If voltage does not pulsate during wiper operation, go to step 5). If voltage pulsates during wiper operation, go to next step.
3. Turn ignition off. Disconnect wiper motor connector. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Go to next step.
4. Using an external ohmmeter, check resistance of park switch sense circuit (Dark Green wire) between Blue BCM terminal No. 20 and wiper motor connector Dark Green wire. If resistance is more than 5 ohms, repair open Dark Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Turn wiper switch off. Disconnect wiper motor connector. Turn ignition on. Using DRB in voltmeter mode, measure voltage on fused ignition feed circuit (Dark Blue wire) at wiper motor connector. If voltage is less than 10 volts, repair open Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace wiper motor. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 25A - DIAGNOSING ILLUMINATED ENTRY SYSTEM

Note. Liftgate lights are not a part of this system.

1. Move dimmer control lever to center position. Turn courtesy lights on by opening left front door. If courtesy lights are off, go to «TEST 28A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-28a-diagnosing-courtesy-light) . If courtesy lights are on, go to next step.
2. Lower left front window. Close and manually lock left front door. Turn ignition off. Wait 60 seconds. Actuate illuminated entry system by lifting left front door handle. If courtesy lights are off, go to «TEST 26A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-26a-diagnosing-left-front) . If lights are on, go to next step.
3. Lower right front window. Close and manually lock right front door. Turn ignition off. Wait 60 seconds. Actuate illuminated entry system by lifting right front door handle. If courtesy lights are off, go to «TEST 26B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-26b-diagnosing-right-front) . If lights are on, system is okay at this time.

TEST 26A - DIAGNOSING LEFT FRONT DOOR ILLUMINATED ENTRY SW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Gain access to Body Control Module (BCM). BCM is located behind center console. Using DRB in voltmeter mode, backprobe illuminated entry sense circuit (White wire) at Blue BCM connector terminal No. 7. If voltage is less than 4 volts, go to «TEST 27A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-27a-repairing-illuminated-entry) . If voltage is more than 4 volts, go to next step.
2. With probe connected, lift and hold left door handle. If voltage is less than 4 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 4 volts, go to next step.
3. Remove left front door panel and disconnect illuminated entry switch connector. Connect jumper wire between illuminated entry switch connector terminal No. 1 (Black wire) and terminal No. 2 (White wire). If courtesy lights illuminate, replace left door illuminated entry switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If courtesy lights do not illuminate, go to next step.
4. Connect a jumper wire between illuminated entry switch connector terminal No. 2 (White wire) and ground. If courtesy lights illuminate, repair open Black wire between illuminated entry switch connector and ground. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If courtesy lights do not illuminate, repair open in White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 26B - DIAGNOSING RIGHT FRONT DOOR ILLUMINATED ENTRY SW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Gain access to Body Control Module (BCM). BCM is located under right side of instrument panel. Using DRB in voltmeter mode, backprobe illuminated entry sense circuit (White wire) at Blue BCM connector terminal No. 7. If voltage is less than 4 volts, proceed to «TEST 27A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-27a-repairing-illuminated-entry) . If voltage is more than 4 volts, go to next step.
2. With probe connected, lift and hold right door handle. If voltage is less than 4 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 4 volts, go to next step.
3. Remove right front door panel and disconnect illuminated entry switch connector. Connect a jumper wire between illuminated entry switch connector terminal No. 1 (Black wire) and terminal No. 2 (White wire). If courtesy lights illuminate, replace right door illuminated entry switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If courtesy lights do not illuminate, go to next step.
4. Connect jumper wire between illuminated entry switch connector terminal No. 2 (White wire) and ground. If courtesy lights illuminate, repair open Black wire between illuminated entry switch connector and ground. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If courtesy lights do not illuminate, repair open White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 27A - REPAIRING ILLUMINATED ENTRY SHORT TO GROUND

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. Using DRB in ohmmeter mode, check resistance of illuminated entry sense circuit (White wire) at Blue BCM connector terminal No. 7. If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
2. Remove front left door panel. Disconnect illuminated entry switch connector. Check resistance of sense circuit (White wire) at illuminated entry switch connector terminal No. 1. If resistance is more than 5 ohms, replace left door illuminated entry switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Remove right door panel. Disconnect illuminated entry switch connector. Check resistance of sense circuit (White wire) at illuminated entry switch connector terminal No. 1. If resistance is more than 5 ohms, replace right door illuminated entry switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 28A - DIAGNOSING COURTESY LIGHT SYSTEM

Note. For wiring diagrams, see WIRING DIAGRAMS in this article.

Courtesy light system diagnostics are separated into 8 categories. Verify customer complaint and identify problem area before performing appropriate test. See DIAGNOSING COURTESY LIGHT SYSTEMS table.

DIAGNOSING COURTESY LIGHT SYSTEMS

TEST 28B - DIAGNOSING COURTESY LIGHT CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, actuate courtesy lights. If courtesy lights cycle on and off, go to «TEST 29A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-29a-courtesy-light-door) . If courtesy lights do not cycle on and off, go to next step.
2. Turn ignition off. Access left pod switch Black connector. Using DRB in voltmeter mode, check voltage on fused battery feed circuit (Pink wire) at left pod switch Black connector terminal No. 4. If voltage is more than 10 volts, go to step 4). If voltage is less than 10 volts, go to next step.
3. Remove and inspect IOD fuse in fuse block. If fuse is blown, go to «TEST 28C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-28c-diagnosing-courtesy-light) . If fuse is okay, check voltage on battery feed circuit (Black/Red wire) at IOD fuse. If voltage is more than 10 volts, repair open Black/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair Pink wire as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. With dimmer control lever in center position, check voltage on courtesy light switch output circuit (Pink/Light Blue wire) at left pod switch Black connector terminal No. 5. If voltage is less than 10 volts, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
5. Gain access to rear dome light terminals. Check voltage on courtesy light switch output circuit (Pink/Light Blue wire) at dome light connector. If voltage is less than 10 volts, repair open Pink/Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
6. Check voltage on courtesy lights driver circuit (Yellow wire) at dome light connector. If voltage is less than 10 volts, replace open bulb. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, repair open Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 28C - DIAGNOSING COURTESY LIGHT BATTERY FEED CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Note. Ensure vanity mirror, glove box and under seat lights are off. All doors MUST be closed during the following test steps.

1. Using DRB in ohmmeter mode, check resistance of fused battery feed circuit (Pink wire) at IOD fuse in Power Distribution Center (PDC). If resistance is more than 5 ohms, replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
2. Disconnect Black left pod switch connector. Check resistance of fused battery feed circuit (Pink wire) at Black left pod switch connector. If resistance is less than 5 ohms, go to step 4). If resistance is more than 5 ohms, go to next step.
3. Check resistance of switch output circuit (Pink/Light Blue wire) at Black left pod switch connector terminal No. 5. If resistance is less than 5 ohms, repair short to ground in Pink/Light Blue wire and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace left pod switch and IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. Disconnect Body Control Module (BCM) connectors. BCM is located behind center console. Ensure probe is still connected to IOD fuse connector (Pink wire). If resistance is more than 5 ohms, replace BCM and IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
5. Disconnect instrument cluster connector. Check resistance at IOD fuse connector (Pink wire). If resistance is more than 5 ohms, repair or replace instrument cluster and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
6. Disconnect radio connector. Check resistance at IOD fuse connector (Pink wire). If resistance is more than 5 ohms, replace radio and fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Pink wire and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 29A - COURTESY LIGHT DOOR SWITCHES

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, stop courtesy light actuation. Open left front door. Using DRB, read left front door ajar switch status. If DRB does not display LF DOOR AJAR:CLOSED, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB displays LF DOOR AJAR:CLOSED, go to next step.
2. Open right front door. Using DRB, read right front door ajar switch status. If DRB does not display RF DOOR AJAR:CLOSED, go to «TEST 41A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-41a-diagnosing-door-ajar) . If DRB displays RF DOOR AJAR:CLOSED, go to next step.
3. Open side door. Using DRB, read side door ajar switch status. If DRB does not display SIDE DR AJAR:CLOSED, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) . If DRB displays SIDE DR AJAR:CLOSED, go to next step.
4. Open liftgate door. Using DRB, read gate ajar switch status. If DRB does not display GATE AJAR:CLOSED, go to «TEST 43A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-43a-diagnosing-door-ajar) . If DRB displays GATE AJAR:CLOSED, go to next step.
5. Turn ignition off. Gain access to Body Control Module (BCM), located behind center console. Disconnect Blue BCM connector. Using DRB in voltmeter mode, check voltage on fused battery feed circuit (Pink wire) at Blue BCM connector terminal No. 16. If voltage is less than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 30A - DIAGNOSING COURTESY LIGHT CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. If only rear overhead console lights are inoperative, go to step 5). Gain access to inoperative courtesy lights. Remove and inspect inoperative bulbs. Replace any open bulbs. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If bulbs are not okay, go to next step.
2. Using DRB in voltmeter mode, check voltage on switched battery feed circuit (Pink/Light Blue wire) at each inoperative bulb. If voltage is less than 10 volts, repair open Pink/Light Blue wire to bulb. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
3. Turn ignition off. Gain access to Body Control Module (BCM), located behind center console. Disconnect Blue BCM connector. Go to next step.
4. Using an external ohmmeter, check resistance of courtesy light control circuit (Yellow wire) between Blue BCM connector terminal No. 25 and inoperative courtesy light bulb connector. If resistance is more than 5 ohms, repair open Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, reconnect courtesy bulbs and BCM, then retest system.
5. Gain access to overhead console lights. Remove and inspect bulbs. Replace any open bulbs. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If bulbs are okay, go to next step.
6. Using DRB in voltmeter mode, check voltage on switch output circuit (Gray wire) at each inoperative bulb. If voltage is less than 10 volts, repair open Gray wire to bulb. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, repair open Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 31A - DIAGNOSING DOME LIGHT SWITCH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Gain access to Black left pod switch connector. Ensure all doors are closed. Connect jumper wire between switch sense circuit (Black/Light Blue wire) at Black left pod switch connector terminal No. 2 and ground. If courtesy lights illuminate, go to step 4). If courtesy lights do not illuminate, go to next step.
2. Turn ignition off. Disconnect Black left pod switch connector and Body Control Module (BCM) connectors. BCM is located behind center console. Go to next step.
3. Using an external ohmmeter, check resistance of switch sense circuit (Black/Light Blue wire) between Blue Body Control Module (BCM) connector terminal No. 1 and Black left pod switch connector. If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair open in Black/Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
4. Turn ignition off and disconnect Black left pod switch connector. Using an external ohmmeter, check resistance of system ground circuit (Black wire) at Black left pod switch connector terminal No. 6. If resistance is more than 5 ohms, repair open Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 32A - COURTESY LIGHTS ON AT ALL TIMES

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure all doors are closed and dimmer switch on left pod switch is in center position. Using DRB, read door ajar switch status. If DRB does not display LF DOOR AJAR:OPEN, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB displays LF DOOR AJAR:OPEN, go to next step.
2. If DRB does not display RF DOOR AJAR:OPEN, go to «TEST 41A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-41a-diagnosing-door-ajar) . If DRB displays RF DOOR AJAR:OPEN, go to next step.
3. If DRB does not display SIDE DR AJAR:OPEN, go to «TEST 42A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42a-diagnosing-door-ajar) . If DRB displays SIDE DR AJAR:OPEN, go to next step.
4. If DRB does not display GATE AJAR:OPEN, go to «TEST 43A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-43a-diagnosing-door-ajar) . If DRB displays GATE AJAR:OPEN, go to next step.
5. Turn ignition off. Gain access to Body Control Module (BCM), located behind center console. Disconnect BCM connectors. If courtesy lights stay on all the time, repair short to ground in Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If courtesy lights do not stay on all the time, go to next step.
6. Using DRB in ohmmeter mode, check resistance of switch sense circuit (Black/Light Blue wire) at Blue BCM connector terminal No. 1. If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
7. Disconnect Black left pod switch connector. Check resistance of switch sense circuit (Black/Light Blue wire) at Blue BCM connector terminal No. 1. If resistance is more than 5 ohms, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Black/Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 33A - DIAGNOSING KEY-IN LIGHT CIRCUIT

Key-in light system diagnostics is separated into 2 categories. Verify customer complaint and identify problem area before performing appropriate test. See DIAGNOSING KEY-IN LIGHT SYSTEMS table.

DIAGNOSING KEY-IN LIGHT SYSTEMS

TEST 33B - CHECKING FOR OPEN KEY-IN LIGHT CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Using DRB in voltmeter mode, check voltage on key-in light driver circuit (Yellow/Red wire) at Blue BCM connector terminal No. 19. If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step. NOTE: Key-in ignition switch connector MUST remain connected during following steps.
3. Gain access to key-in ignition switch connector. Using DRB in voltmeter mode, backprobe key-in light driver circuit (Yellow/Red wire) at key-in ignition switch connector terminal No. 4. If voltage is more than 10 volts, repair open Yellow/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
4. Backprobe courtesy light switch output circuit (Pink/Light Blue wire) at key-in ignition switch connector terminal No. 3. If voltage is less than 10 volts, repair open Pink/Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, repair or replace key-ignition bulb or socket as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure)

TEST 33C - CHECKING FOR OPEN KEY-IN LIGHT CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Access Body Control Module (BCM). BCM is located behind center console. Disconnect Blue BCM connector. If key-in light turns off, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If key-in light does not turn off, go to next step.
2. Disconnect key-in ignition switch connector. Using DRB in ohmmeter mode, check resistance of key-in light driver circuit (Yellow/Red wire) at key-in ignition switch connector terminal No. 4. If resistance is more than 5 ohms, replace ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Yellow/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 34A - HEADLTS WILL NOT TURN OFF/DIAG HEADLT TIME DLY CKT

Headlight time delay system diagnostics is separated into 2 categories. Verify customer complaint and identify problem area before performing appropriate test. See DIAGNOSING HEADLIGHT TIME DELAY SYSTEM table.

DIAGNOSING HEADLIGHT TIME DELAY SYSTEM

TEST 34B - TIME DELAY WILL NOT TURN OFF

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure headlight switch is off. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. If headlights go off, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If headlights are still on, go to next step.
2. Remove headlight low beam relay from relay block. If headlights are still on, go to step 6). If headlights go off, gain access to back of relay block. Go to next step.
3. Using DRB in ohmmeter mode, check resistance of relay control circuit (Orange/White wire) at low beam relay connector. If resistance is more than 5 ohms, replace headlight low beam relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
4. Disconnect left pod switch assembly. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Check resistance of relay control circuit (Orange/White wire) at low beam relay connector. If resistance is less than 5 ohms, repair short to ground in Orange/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace left pod switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Remove fuses No. 17 and 18 from fuse block. If both headlights go off, repair short to voltage in Violet/White wire between headlight low beam relay and fuses. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If both headlights do not go off, go to next step.
7. If right headlight does not go off, repair short to voltage in Red/Orange wire between high beam relay and right headlight. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If left headlight does not go off, repair short to voltage in Violet/White wire between high beam relay and left headlight. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 35A - TIME DELAY WILL NOT TURN ON

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Note. This test is only for vehicles equipped with Compass/mini -trip computer.

1. Turn ignition on. Turn low beam headlights on. If park lights and headlights do not operate properly by headlight switch, check headlight switch circuit and repair as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If park lights and headlights operate properly, go to next step.
2. Turn ignition off. Turn headlights off. If headlights remain on for 60 seconds and then go off, headlight time delay circuit is operational. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If headlights do not remain on for 60 seconds and then go off, go to next step.
3. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
4. Connect a jumper wire between low beam relay control circuit (Orange/White wire) at Natural BCM connector terminal No. 15. Check headlights. If headlights are off, repair open Orange/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If headlights are on, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 36A - IDENTIFYING LIFTGATE RELEASE PROBLEM

Verify customer complaint and identify problem area before performing test. If vehicle is experiencing liftgate problem at this time, go to TEST 36C . If system is operating at this time, perform TEST VER-1B .

Note. Test sequence skips from TEST 36A to TEST 36C. No test procedures have been omitted.

TEST 36C - REPAIRING LIFTGATE RELEASE PROBLEM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Note. Liftgate release will not work if liftgate is open or vehicle is moving. Ensure liftgate mechanical linkage is operating properly before proceeding with test.

1. Ensure liftgate is closed and vehicle is not moving. Turn ignition on. depress and release liftgate switch. If liftgate solenoid does not operate, go to step 3). If liftgate solenoid operates, go to next step.
2. If liftgate opened when switch was depressed, liftgate release is operating properly. If liftgate did not open, gain access to liftgate release solenoid. Inspect solenoid and linkage. Repair linkage as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If linkage is okay, adjust liftgate latch as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
3. Ensure liftgate is closed. Using DRB, read liftgate ajar switch status. If DRB does not display GATE AJAR:CLOSED, go to «TEST 43A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-43a-diagnosing-door-ajar) . If DRB displays GATE AJAR:CLOSED, go to next step.
4. Remove and inspect fuse No. 4 from fuse panel. If fuse is blown, go to «TEST 36D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-36d-repairing-shorted-liftgate) . If fuse is okay, go to next step.
5. Reinstall fuse No. 4. Remove liftgate release relay from relay block. Using DRB in voltmeter mode, check voltage on fused battery supply circuit (Dark Green/Yellow wire) at liftgate release relay connector. If voltage is less than 10 volts, repair open Dark Green/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 10 volts, go to next step.
6. Check voltage on switch output circuit ((Yellow/Black wire) at liftgate release relay connector. Depress liftgate release switch while observing DRB voltage. If voltage is more than 10 volts, go to step 9). If voltage is less than 10 volts, go to next step.
7. Disconnect liftgate release switch connector. Check voltage on fused battery supply circuit (Light Green/Black wire) at liftgate release switch connector. If voltage is less than 10 volts, repair open Light Green/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
8. Connect a jumper wire between fused battery supply circuit (Light Green/Black wire) and switch output circuit (Yellow/Black wire) at liftgate release connector. If voltage is less than 10 volts, repair open Yellow/black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace liftgate release switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
9. Connect a jumper wire between fused battery supply circuit (Dark Green/Yellow wire) and liftgate release relay output circuit (Light Green/Black wire) at liftgate release relay connector. If liftgate release solenoid operated with jumper wire connected, go to step 11). If solenoid did not operate, go to next step.
10. Disconnect liftgate release solenoid connector. Ensure jumper wire is still connected. Check voltage on fused liftgate release relay output circuit (Light Green/Black wire) at liftgate release solenoid connector. If voltage is less than 10 volts, repair open Light Green/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, replace liftgate release solenoid. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
11. Disconnect jumper wire. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Using an external ohmmeter, check resistance of liftgate release relay control circuit (Brown/Light Blue wire) between liftgate release relay connector and Blue BCM connector terminal No. 18. If resistance is more than 5 ohms, repair open Brown/Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
12. Reinstall liftgate release relay. Connect a jumper wire between liftgate release relay control circuit (Brown/Light Blue wire) at Blue BCM connector terminal No. 18 and ground. Depress liftgate release switch. If liftgate solenoid does not operate, replace liftgate release relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If solenoid operates, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 36D - REPAIRING SHORTED LIFTGATE CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove liftgate release relay from relay block. Using DRB in ohmmeter mode, check resistance of liftgate release relay output circuit (Light Green/Black wire) at liftgate release relay connector. If resistance is less than 5 ohms, go to step 6). If resistance is more than 5 ohms, go to next step.
2. Check resistance of fuse battery supply circuit (Dark Green/Yellow wire) at liftgate release relay connector. If resistance is more than 5 ohms, repair short to ground in Dark Green/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Check resistance of release switch output circuit (Yellow/Black wire) at liftgate release relay connector. If resistance is more than 5 ohms, replace liftgate release relay. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms and vehicle is not equipped with Remote Keyless Entry (RKE), repair short to ground in Yellow/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If vehicle is equipped with RKE, go to next step. NOTE: RKE module may be accessed by carefully prying each end of instrument panel top cover and sliding cover forward to disengage front clips.
4. Gain access to Remote Keyless Entry (RKE) module. RKE module is located under instrument panel top cover, behind information center. Disconnect RKE module connectors. Go to next step.
5. Check resistance of release switch output circuit (Yellow/Black wire) at liftgate release relay connector. If resistance is more than 5 ohms, replace RKE module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Yellow/Black wire). go to next step.
6. Disconnect liftgate release solenoid connector. Check resistance of release switch output circuit (Yellow/Black wire) at liftgate release relay connector. If resistance is more than 5 ohms, replace liftgate release solenoid. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Yellow/Black wire). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 37A - DIAGNOSING SEAT BELT WARNING LIGHT CIRCUIT

Seat belt warning light system diagnostics is separated into 2 categories. Verify customer complaint and identify problem area before performing appropriate test. See DIAGNOSING SEAT BELT WARNING LIGHT SYSTEM table.

DIAGNOSING SEAT BELT WARNING LIGHT SYSTEM

TEST 37B

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure left front seat belt is not fastened. Using DRB, read seat belt switch status. If DRB does not display SEAT BELT CLOSED, go to «TEST 37D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-37d-checking-for-open) . If DRB displays SEAT BELT CLOSED, go to next step.
2. Fasten left front seat belt. If DRB does not display SEAT BELT OPEN, go to «TEST 37E»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-37e-checking-for-short) . If DRB displays SEAT BELT OPEN, go to next step.
3. Using DRB, actuate seat belt warning light test. If seat belt warning light flashes, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If seat belt warning light does not flash, go to next step.
4. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Turn ignition on. Using DRB in voltmeter mode, check voltage on seat belt light driver circuit (Dark Blue/Red wire) at Blue BCM connector terminal No. 21. If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
6. Turn ignition off. Disconnect information center connector. Turn ignition on. Check voltage on fused ignition switch output circuit (Dark Blue/Yellow wire) at information center connector No. 9. If voltage is less than 10 volts, repair open in Dark Blue/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
7. Inspect seat belt warning light bulb and connector. If bulb is blown or connector is damaged, repair as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If bulb and connector are okay, repair open in Dark Blue/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 37C - CHECKING FOR SHORT IN SEAT BELT WARNING LIGHT CKT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Turn ignition on. If seat belt warning light is off, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If seat belt warning light is on, repair short to ground in seat belt switch output circuit (Dark Blue/Red wire). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 37D - CHECKING FOR OPEN IN SEAT BELT SWITCH CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect left front seat belt switch connector. Connector is located under left front seat. Connect a jumper wire between seat belt switch input circuit (Light Green/Red) and system ground circuit (Black wire) at seat belt switch connector. Using DRB, read seat belt switch status. If DRB displays SEAT BELT CLOSED, replace left front seat belt switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display SEAT BELT CLOSED, go to next step.
2. Disconnect jumper wire. Connect jumper wire between seat belt switch input circuit (Light Green/Red wire) at seat belt switch connector and ground. If DRB displays SEAT BELT CLOSED, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display SEAT BELT CLOSED, go to next step.
3. Gain access to Body Control Module (BCM). BCM is located behind center console. Connect a jumper wire between seat belt switch input circuit (Light Green/Red wire) and ground circuit (Black wire) at Blue BCM connector. If DRB displays SEAT BELT CLOSED, repair open in Light Green/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display SEAT BELT CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 37E - CHECKING FOR SHORT IN SEAT BELT SWITCH CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect left front seat belt switch connector. Connector is located under left front seat. Using DRB, read seat belt switch status. If DRB does not display SEAT BELT CLOSED, replace left front seat belt switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays SEAT BELT CLOSED, go to next step.
2. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
3. Using DRB in ohmmeter mode, check resistance of seat belt switch input circuit (Light Green/Red wire) at Blue body connector terminal No. 3. If resistance is more than 10 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 10 ohms, repair short to ground in Light Green/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 38A - IDENTIFYING CHIME SYSTEM PROBLEM

Chime system diagnostics is separated into 3 categories. Verify customer complaint and identify problem area before performing appropriate test. See DIAGNOSING CHIME SYSTEM table.

DIAGNOSING CHIME SYSTEM

TEST 38B - CHIME DOES NOT OPERATE

Close all doors. Turn ignition on. Using DRB, actuate chime test. If chime does not operate, replace body control module. Perform TEST VER-1B . If chime operates, system is operating properly at this time. Perform TEST VER-1B .

TEST 38C - DIAGNOSING CHIME WITH SEAT BELT BUCKLED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Close driver's door and buckle driver's seat belt. Turn ignition on. If chime operates for 6 seconds, system is operating properly at this time. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If chime does not operate for 6 seconds, go to next step.
2. Using DRB, read seat belt switch status. If DRB does not display SEAT BELT CLOSED, replace Body Control Module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays SEAT BELT CLOSED, go to next step.
3. Disconnect seat belt switch (located under driver's seat). Using DRB, read seat belt switch status. If DRB does not display SEAT BELT CLOSED, replace seat belt switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays SEAT BELT CLOSED, go to next step.
4. Disconnect Blue BCM connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of seat belt switch sense circuit (Light Green/Red wire) at Blue BCM connector terminal No. 3. If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Light Green/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 38D - DIAGNOSING CHIME WITH DRIVER'S DOOR OPEN

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove key from ignition, turn exterior lights off and open driver's door. If chime does not operate, system is operating properly at this time. If chime operates, go to next step.
2. Using DRB, read key-in ignition status. If DRB displays KEY IN IGN:CLOSED, go to step 5). If DRB does not display KEY IN IGN:CLOSED, go to next step.
3. Using DRB, read headlamp status. If DRB displays HEADLAMPS:OFF, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display HEADLAMPS:OFF, go to next step.
4. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in voltmeter mode, check voltage on fused park light relay output circuit (Tan wire) at Natural BCM connector terminal No. 16. If voltage is more than 10 volts, repair short to battery voltage in Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Disconnect key-in ignition switch connector (4-wire connector located at ignition). Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
6. Using DRB, read key-in ignition status. If DRB does not display KEY IN IGN:CLOSED, replace ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays KEY IN IGN:CLOSED, go to next step.
7. Disconnect Blue BCM connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of key-in ignition sense circuit (Light Blue wire) at Blue BCM connector terminal No. 4. If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 39A - DIAGNOSING NO CHIME WITH EXTERIOR LIGHTS ON

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove key from ignition, turn headlights on and open driver's door. If chime operates, system is operating properly at this time. If chime does not operate, go to next step.
2. Using DRB, read left front door ajar switch status. If DRB does not display LF DOOR AJAR:CLOSED, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB displays LF DOOR AJAR:CLOSED, go to next step.
3. Using DRB, read headlight status. If DRB does not display HEADLAMPS ON, go to «TEST 8A - EIC»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8a-eic-or-compassmini-trip) . If DRB displays HEADLAMPS ON, go to next step.
4. Using DRB, read ignition voltage. If voltage is less than 10 volts, go to «TEST 38B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-38b-chime-does-not) . If voltage is more than 10 volts, replace body control module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 39B - DIAGNOSING NO CHIME WITH KEY IN IGNITION

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off, but ensure key is in ignition. Open driver's door. If chime operates, system is operating properly at this time. If chime does not operate, go to next step.
2. Using DRB, read left front door ajar switch status. If DRB does not display LF DOOR AJAR:CLOSED, go to «TEST 40A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-40a-diagnosing-door-ajar) . If DRB displays LF DOOR AJAR:CLOSED, go to next step.
3. Using DRB, read key-in ignition status. If DRB does not display KEY IN IGN:CLOSED, go to step 5). If DRB displays KEY IN IGN:CLOSED, go to next step.
4. Using DRB, read ignition voltage. If voltage is less than 10 volts, go to «TEST 38B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-38b-chime-does-not) . If voltage is more than 10 volts, replace body control module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Disconnect key-in ignition switch connector (4-wire connector located at ignition). Connect a jumper wire between ignition switch sense circuit (Light Blue wire) and system ground (Black wire) at key-in ignition switch connector. If DRB displays KEY IN IGN:CLOSED, replace ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display KEY IN IGN:CLOSED, go to next step.
6. Connect a jumper wire between ignition switch sense circuit (Light Blue wire) and chassis ground. If DRB displays KEY IN IGN:CLOSED, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display KEY IN IGN:CLOSED, go to next step.
7. Gain access to Body Control Module (BCM). BCM is located behind center console. Connect a jumper wire between key-in ignition switch sense circuit at Blue BCM connector terminal No. 4 (Light Blue wire) and ground. If DRB displays KEY IN IGN:CLOSED, repair open in Light Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display KEY IN IGN:CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 39C - DIAGNOSING NO CHIME WITH SEAT BELT FASTENED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Close driver's door and unbuckle driver's seat belt. Turn ignition on. If chime operates for 6 seconds, system is operating properly at this time. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If chime does not operate for 6 seconds, go to next step.
2. Using DRB, read seat belt switch status. If DRB does not display SEAT BELT CLOSED, replace go to «TEST 37D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-37d-checking-for-open) . If DRB displays SEAT BELT CLOSED, go to next step.
3. Using DRB, read ignition voltage. If voltage is more than 10 volts, go to «TEST 38B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-38b-chime-does-not) . If voltage is less than 10 volts, go to next step.
4. Using DRB in voltmeter mode, check voltage on fused ignition switch output circuit (Dark Blue/White wire) at Blue BCM connector terminal No. 12. If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair open Dark Blue/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 39D - DIAGNOSING NO CHIME WITH TURN SIGNALS ON

1. If speedometer is not working properly, go to «TEST 4A - ELECTRONIC INSTRUMENT CLUSTER»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-4a-electronic-instrument-cluster) for electronic instrument cluster models, or «TEST 10A - FAULTY»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-10a-faulty-gauge-on) GAUGE for electro/mechanical instrument cluster. If speedometer is working properly, go to next step.
2. Turn ignition on. Ensure turn signals operate correctly. If turn signals do not operate correctly, check and repair system as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If turn signals operate correctly, go to next step.
3. Turn left turn signal on. Using DRB, read left turn signal status. If DRB does not display ON then OFF, go to «TEST 39E»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-39e-repairing-left-turn) . If DRB displays ON then OFF, go to next step.
4. Turn right turn signal on. Using DRB, read right turn signal status. If DRB does not display ON then OFF, go to «TEST 39F»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-39f-repairing-right-turn) . If DRB displays ON then OFF, system is working properly at this time. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 39E - REPAIRING LEFT TURN SIGNAL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Turn ignition on. Go to next step.
2. Using DRB in voltmeter mode, check voltage on left turn signal sense circuit (Light Green wire) at Blue BCM connector terminal No. 5. If voltage is pulsing between zero and 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is not pulsing between zero volt and 10 volts, repair open in Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 39F - REPAIRING RIGHT TURN SIGNAL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Turn ignition on. Go to next step.
2. Using DRB in voltmeter mode, check voltage on right turn signal sense circuit (Tan wire) at Natural BCM connector terminal No. 14. If voltage is pulsing between zero and 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is not pulsing between zero volt and 10 volts, repair open in Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 40A - DIAGNOSING DOOR AJAR CIRCUIT (LEFT FRONT DOOR)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure left front door is aligned properly. Align or adjust door as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If door is aligned properly, go to next step.
2. Close left front door. Turn ignition on. Using DRB, read left front door ajar switch status. If DRB does not display LF DOOR AJAR:OPEN, go to step 7). If DRB displays LF DOOR AJAR:OPEN, go to next step.
3. Open left front door. Using DRB, read door ajar switch status. If DRB displays LF DOOR AJAR:CLOSED, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display LF DOOR AJAR:CLOSED, go to next step.
4. Disconnect left front door ajar switch connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Connect a jumper wire between left door ajar sense circuit (Tan wire) at left front door ajar switch connector and ground. If DRB displays LF DOOR AJAR:CLOSED, replace left front door ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display LF DOOR AJAR:CLOSED, go to next step
6. Disconnect jumper wire. Gain access to Body Control Module (BCM). BCM is located behind center console. Connect a jumper wire between left door ajar sense circuit (Tan wire) at Blue BCM connector terminal No. 2 and ground. If DRB displays LF DOOR AJAR:CLOSED, repair open in Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display LF DOOR AJAR:CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
7. Disconnect left front door ajar switch connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
8. If DRB displays LF DOOR AJAR:OPEN, replace left front door ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display LF DOOR AJAR:OPEN, go to next step.
9. Turn ignition off. Disconnect Blue BCM connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
10. Using DRB in ohmmeter mode, check resistance of front door ajar sense circuit (Tan wire) at Blue BCM connector terminal No. 2. If resistance is less than 5 ohms, repair short to ground in Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 41A - DIAGNOSING DOOR AJAR CIRCUIT (RIGHT FRONT DOOR)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure right front door is aligned properly. Align or adjust door as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If door is aligned properly, go to next step.
2. Close right front door. Turn ignition on. Using DRB, read right front door ajar switch status. If DRB does not display RF DOOR AJAR:OPEN, go to step 7). If DRB displays RF DOOR AJAR:OPEN, go to next step.
3. Open right front door. Using DRB, read door ajar switch status. If DRB displays RF DOOR AJAR:CLOSED, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display RF DOOR AJAR:CLOSED, go to next step.
4. Disconnect right front door ajar switch connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Connect a jumper wire between right door ajar sense circuit (Tan/Red wire) at right front door ajar switch connector and ground. If DRB displays RF DOOR AJAR:CLOSED, replace right front door ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display RF DOOR AJAR:CLOSED, go to next step.
6. Disconnect jumper wire. Gain access to Body Control Module (BCM). BCM is located behind center console. Connect a jumper wire between right door ajar sense circuit (Tan/Red wire) of Natural BCM connector terminal No. 2 and ground. If DRB displays RF DOOR AJAR:CLOSED, repair open Tan/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display RF DOOR AJAR:CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
7. Disconnect right front door ajar switch connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
8. If DRB displays RF DOOR AJAR:OPEN, replace right front door ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display RF DOOR AJAR:OPEN, go to next step.
9. Turn ignition off. Disconnect Natural BCM connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
10. Using DRB in ohmmeter mode, check resistance of front door ajar sense circuit (Tan/Red wire) at Natural BCM connector terminal No. 2. If resistance is less than 5 ohms, repair short to ground in Tan/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 42A - DIAGNOSING DOOR AJAR CIRCUIT (SIDE DOOR)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure side door is aligned properly. Align or adjust door as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If door is aligned properly, go to next step.
2. Close side door. Turn ignition on. Using DRB, read side door ajar switch status. If DRB does not display SIDE DR AJAR:OPEN, go to step 7). If DRB displays SIDE DR AJAR:OPEN, go to next step.
3. Open side door. If DRB displays SIDE DR AJAR:CLOSED, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display SIDE DR AJAR:CLOSED, go to next step.
4. Disconnect side door ajar switch connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Connect a jumper wire between side door ajar sense circuit switch connector (Tan/Yellow wire) and ground. If DRB does not display SIDE DR AJAR:CLOSED, go to «TEST 42B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-42b-diagnosing-door-ajar) . If DRB displays SIDE DR AJAR:CLOSED, go to next step.
6. Remove jumper wire. Connect jumper wire between side door ajar sense circuit (Tan/Yellow wire) and system ground circuit (Black wire) at side door ajar switch connector. If DRB does not display SIDE DR AJAR:CLOSED, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays SIDE DR AJAR:CLOSED, replace side door ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
7. Disconnect side door ajar switch connector. If DRB displays SIDE DR AJAR:OPEN, replace side door ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display SIDE DR AJAR:OPEN, go to next step.
8. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of side door ajar sense circuit (Tan/Yellow wire) at Natural BCM connector terminal No. 3. If resistance is less than 5 ohms, repair short to ground in Tan/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 42B - DIAGNOSING DOOR AJAR CIRCUIT (SIDE DOOR)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect jumper wire (if connected). Gain access to Natural Body Control Module (BCM) connector. BCM is located behind center console. Go to next step.
2. Connect a jumper wire between side door ajar sense circuit (Tan/Yellow wire) at Natural BCM connector terminal No. 3 and ground. If DRB displays SIDE DR AJAR:CLOSED, repair open in Tan/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display SIDE DR AJAR:CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 43A - DIAGNOSING DOOR AJAR CIRCUIT (LIFTGATE)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure liftgate is aligned properly. Align or adjust liftgate as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If liftgate is aligned properly, go to next step.
2. Close liftgate. Turn ignition on. Using DRB, read liftgate ajar switch status. If DRB does not display GATE AJAR:OPEN, go to step 7). If DRB displays GATE AJAR:OPEN, go to next step.
3. Open liftgate. Using DRB, read gate ajar switch status. If DRB displays GATE AJAR:CLOSED, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display GATE AJAR:CLOSED, go to next step.
4. Disconnect liftgate ajar switch connector. Connector is located at bottom of liftgate behind trim panel. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Connect a jumper wire between liftgate ajar sense circuit (Tan/Black wire) at liftgate ajar switch connector and ground. If DRB displays GATE AJAR:CLOSED, replace liftgate ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display GATE AJAR:CLOSED, go to next step.
6. Gain access to Body Control Module (BCM). BCM is located behind center console. Connect a jumper wire between liftgate ajar sense circuit (Tan/Black wire) at Natural BCM connector terminal No. 4 and ground. If DRB displays GATE AJAR:CLOSED, repair open in Tan/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display GATE AJAR:CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
7. Disconnect liftgate ajar switch connector. Connector is located at bottom of liftgate behind trim panel. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
8. If DRB displays GATE AJAR:OPEN, replace liftgate ajar switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display GATE AJAR:OPEN, go to next step.
9. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
10. Using DRB in ohmmeter mode, check resistance of liftgate ajar sense circuit (Tan/Black wire) at Natural BCM connector terminal No. 4. If resistance is less than 5 ohms, repair short to ground in Tan/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 44A - REPAIRING FAULTY WASHER FLUID LEVEL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Check washer fluid level. If washer fluid is not full, add fluid as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If washer fluid is full, go to next step.
2. Using DRB, read washer fluid switch status. If DRB displays CIRCUIT OPEN, go to step 6). If DRB does not display CIRCUIT OPEN, go to next step.
3. Disconnect washer fluid level switch connector. If DRB displays CIRCUIT OPEN, replace washer fluid level switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT OPEN, go to next step.
4. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
5. Using DRB in ohmmeter mode, check resistance of washer fluid level sense circuit (Black/Tan wire) at Natural BCM connector terminal No. 13. If resistance is less than 5 ohms, repair short to ground in Black/Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Disconnect washer fluid level switch connector. Connect a jumper wire between Black/Tan and Black wires of washer fluid level switch connector. If DRB displays CIRCUIT CLOSED, replace washer fluid level switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT CLOSED, go to next step.
7. Disconnect jumper wire. Connect a jumper wire between washer fluid level sense circuit (Black/Tan wire) at washer fluid level switch connector and ground. If DRB displays CIRCUIT CLOSED, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT CLOSED, go to next step.
8. Gain access to BCM. BCM is located behind center console. Connect a jumper wire between washer fluid level sense circuit (Black/Tan wire) at BCM connector terminal No. 13 and ground. If DRB displays CIRCUIT CLOSED, repair open in Black/Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display CIRCUIT CLOSED, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 45A - REPAIRING FUEL LEVEL SENDING UNIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect fuel pump/sending unit connector. Connector is located underneath vehicle along frame rail. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Using DRB, read fuel level sensor voltage. If voltage is more than 8 volts, go to step 6). If voltage is less than 8 volts, go to next step.
3. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
4. Turn ignition on. Using DRB in voltmeter mode, check voltage on fused ignition feed circuit (Dark Blue/White wire) at Blue BCM connector terminal No. 12. If voltage is less than 10 volts, repair open in Dark Blue/White wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than 10 volts, go to next step.
5. Turn ignition off. Using DRB in ohmmeter mode, check resistance of fuel sense signal circuit (Dark Blue wire) at Blue BCM connector terminal No. 11. If resistance is less than 5 ohms, repair short to ground in Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Connect a jumper wire between fuel level sense circuit (Dark Blue wire) and system ground circuit (Black wire) at fuel pump/sending unit connector. Using DRB, read fuel level status. If DRB displays less than .2 volt, go to step 10). If DRB displays more than .2 volt, go to next step.
7. Disconnect jumper wire. Connect a jumper wire between fuel level sense circuit (Dark Blue wire) at fuel pump/sending unit connector and ground. If DRB displays less than .2 volt, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays more than .2 volt, go to next step.
8. Disconnect jumper wire. Gain access to BCM. BCM is located behind center console. Leave BCM connectors connected. Backprobe a jumper wire between fuel level sense circuit (Dark Blue wire) at Blue BCM connector terminal No. 11 and ground. If DRB displays less than .2 volt, repair open in Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display .2 volt, go to next step.
9. Turn ignition off. Disconnect Blue BCM connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
10. Disconnect fuel tank sending unit located on top of fuel tank. Reconnect fuel pump/sending unit connector. Using DRB, read fuel level sensor voltage. If voltage is less than 8 volts, repair short to ground in Dark Blue wire. If voltage is more than 8 volts, go to next step.
11. Connect a jumper wire between fuel level sense circuit (Dark Blue wire) and system ground circuit (Black wire) at fuel tank sending unit connector. Using DRB, read fuel level status. If DRB displays less than .2 volt, replace fuel level sensor. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays more than .2 volts, go to next step.
12. Disconnect jumper wire. Connect a jumper wire between fuel level sense circuit (Dark Blue wire) at fuel tank sending unit connector and ground. If DRB displays less than .2 volt, repair open in Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays more than .2 volt, repair open Dark Blue wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 46A - REPAIRING OIL PRESSURE SENDING UNIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Check engine oil level, and top off as necessary. If oil level is okay, remove oil pressure sending unit, and connect an oil pressure gauge in its place. Go to next step.
2. Start engine and check oil pressure reading. If oil pressure is less than 4 psi (.28 kg/cm 2 ) at idle, check engine condition. See appropriate article in ENGINES section. If oil pressure is more than 4 psi (.28 kg/cm 2 ) at idle, go to next step.
3. Allow engine to reach normal operating temperature and check oil pressure reading. If oil pressure is less than 4 psi (.28 kg/cm 2 ) at idle, check engine condition. See appropriate article in ENGINES section. If oil pressure is more than 4 psi (.28 kg/cm 2 ) at idle, go to next step.
4. Turn ignition off. Remove oil pressure test gauge. Reinstall oil pressure sending unit. If instrument cluster is not equipped with an oil gauge, go to «TEST 46B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46b-diagnosing-oil-indicator) . If instrument panel is equipped with an oil pressure gauge, go to «TEST 47A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-47a-diagnosing-oil-press) .

TEST 46B - DIAGNOSING OIL INDICATOR LIGHT (WITHOUT OIL GAUGE)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Note. This test is for vehicles equipped with a base instrument cluster (without oil gauge).

1. Turn ignition on. Using DRB, read oil pressure sending unit status. If DRB does not display OIL PRS LOW:CLOSED, proceed to «TEST 46C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46c-open-oil-pressure) . If DRB displays OIL PRS LOW:CLOSED, check oil indicator light. If oil indicator light is not on, repair open in Gray wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If oil indicator light is on, go to next step.
2. Start engine. Using DRB, read oil pressure sending unit status. If DRB does not display OIL PRS LOW:OPEN, go to next step. If DRB displays OIL PRS LOW OPEN, turn ignition off. System is operating properly at this time. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
3. Disconnect oil pressure sending unit connector. If indicator light goes out, replace oil pressure sending unit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If indicator light does not go out, go to next step.
4. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Turn ignition on. If indicator light goes out, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If indicator light does not go out, go to next step.
5. Disconnect instrument cluster connector (located behind instrument cluster assembly). Using DRB in ohmmeter mode, check resistance of oil pressure sending unit sense circuit (Gray wire) at instrument cluster connector terminal No. 8. If resistance is less than 5 ohms, repair short to ground in Gray wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace instrument cluster. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 46C - OPEN OIL PRESSURE SENDING UNIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect oil pressure sending unit connector. Connect a jumper wire between oil pressure sending unit sense circuit (Gray wire) at oil pressure sending unit connector and ground. Go to next step.
2. Using DRB, read oil pressure sending unit status. If DRB displays OIL PRS LOW:CLOSED, replace oil pressure sending unit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display OIL PRS LOW:CLOSED, leave jumper wire connected and go to next step.
3. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of oil pressure sending unit sense circuit (Gray wire) at Natural BCM connector terminal No. 9. If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, repair open in Gray wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 47A - DIAGNOSING OIL PRESS SENDING UNIT (W/ OIL GAUGE)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition on. Using DRB, read oil pressure voltage. If voltage is less than 8 volts, go to «TEST 47B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-47b-grounded-oil-pressure) . If voltage is more than 8 volts, go to next step.
2. Using DRB, read oil pressure sending unit status. If DRB does not display OIL PRS LOW:CLOSED, go to «TEST 46C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-46c-open-oil-pressure) . If DRB displays OIL PRS LOW:CLOSED, go to next step.
3. Start engine. Using DRB, read oil pressure voltage. If voltage is more than 5 volts, go to «TEST 47C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-47c-open-oil-pressure) . If voltage is less than 5 volts, go to next step.
4. Using DRB, read oil pressure sending unit status. If DRB does not display OIL PRS LOW:OPEN, go to «TEST 47D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-47d-grounded-oil-pressure) . If DRB displays OIL PRS LOW:OPEN, turn ignition off. System is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 47B - GROUNDED OIL PRESSURE SENDING UNIT SIGNAL CKT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect oil pressure sending unit connector. Using DRB, read oil pressure sending unit voltage. If voltage is more than 8 volts, replace oil pressure sending unit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 8 volts, go to next step.
2. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of oil pressure sending unit signal circuit (Gray/Yellow wire) at Natural BCM connector terminal No. 22. If resistance is less than 5 ohms, repair short to ground in Gray/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 47C - OPEN OIL PRESSURE SENDING UNIT SIGNAL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect oil pressure sending unit. Connect a jumper wire between oil pressure sending unit signal circuit (Gray/Yellow wire) and ground. Using DRB at oil pressure sending unit connector. Using DRB, read oil pressure sending unit voltage. If voltage is less than one volt, replace oil pressure sending unit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
2. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of oil pressure sending unit signal circuit (Gray/Yellow wire) at Natural BCM connector terminal No. 22. If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, repair open in Gray/Yellow wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 47D - GROUNDED OIL PRESSURE SENDING UNIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect oil pressure sending unit. Using DRB, read oil pressure sending unit status. If DRB displays OIL PRS LOW:OPEN, replace oil pressure sending unit. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display OIL PRS LOW:OPEN, go to next step.
2. Turn ignition off. Disconnect Natural Body Control Module (BCM) connector. BCM is located behind center console. Using DRB, read oil pressure sending unit status. If DRB displays OIL PRS LOW:OPEN, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB does not display OIL PRS LOW OPEN, go to next step.
3. Turn ignition off. Disconnect instrument cluster connector. Instrument cluster connector is located behind instrument cluster. Using DRB in ohmmeter mode, check resistance of oil pressure sending unit sense circuit (Gray wire) at instrument cluster connector terminal No. 8. If resistance is less than 5 ohms, repair short to ground in Gray wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace instrument cluster. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 48A - ELECTRONIC INSTRUMENT CLUSTER NO RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Electronic Instrument Cluster (EIC) connector. EIC connector is located behind instrument cluster. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Turn ignition on. Using DRB in voltmeter mode, check voltage of CCD BUS positive circuit (Violet/Brown wire) at EIC connector terminal No. 10. If voltage is less than one volt, repair open in Violet/Brown wire between Data Link Connector DLC and EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
3. Check voltage of CCD BUS negative circuit (White/Black wire) at EIC connector terminal No. 9. If voltage is less than one volt, repair open in White/Black wire between DLC and EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is more than one volt, go to next step.
4. Turn ignition off. Using DRB in ohmmeter mode, check resistance of ground circuit (Black/Light Green wire) at EIC connector terminal No. 7. If resistance is more than 5 ohms, repair open in Black/Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
5. Turn ignition on. Using DRB in voltmeter mode, check voltage of fused ignition feed circuit (Dark Blue/White wire) at EIC connector terminal No. 11. If voltage is less than 10 volts, go to «TEST 48B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-48b-electronic-instrument-cluster) . If voltage is more than 10 volts, go to next step.
6. Check voltage of fused battery feed circuit (Pink wire) at EIC terminal No. 2. If voltage is more than 10 volts, replace electronic instrument cluster. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
7. Remove and inspect IOD fuse in Power Distribution Center (PDC). PDC is located in front of left front strut tower. If fuse is open, go to «TEST 48D»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-48d-repairing-instrument-cluster) . If fuse is okay, install fuse and go to next step.
8. Using DRB in voltmeter mode, check voltage of battery feed circuit (Black/Red wire) side of IOD fuse. If voltage is more than 10 volts, repair open in Pink wire between PDC and EIC. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair or replace PDC as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 48B - ELECTRONIC INSTRUMENT CLUSTER NO RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove and inspect fuse No. 15 (ignition feed circuit) from fuse block. If fuse is open, go to step 5). If fuse is okay, install fuse. Turn ignition on and go to next step.
2. Using DRB in voltmeter mode, check voltage of ignition feed circuit (Dark Blue wire) at fuse No 15. If voltage is more than 10 volts, repair open in fused ignition feed circuit (Dark Blue/White wire) between fuse panel and Electronic Instrument Cluster (EIC). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
3. Gain access to ignition switch connector. Using DRB in voltmeter mode, check voltage of ignition feed circuit (Dark Blue wire) at ignition switch connector terminal No. 2. If voltage is more than 10 volts, repair open in Dark Blue wire between ignition and fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
4. Check voltage of battery feed circuit (Red wire) at ignition switch connector terminal No. 7. If voltage is more than 10 volts, replace ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair open in Red wire between battery and ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Turn ignition off. Disconnect Body Control Module (BCM) connectors. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of fused ignition feed circuit (Dark Blue/White wire) at fuse No. 15. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire and replace fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
6. Reconnect BCM connectors. Check resistance of fused ignition feed circuit (Dark Blue/White wire) at fuse No. 15. If resistance is less than 5 ohms, replace BCM and fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
7. Reconnect EIC connector. Using DRB in ohmmeter mode, check resistance of fused ignition feed circuit (Dark Blue/White wire) at fuse No. 15. If resistance is less than 5 ohms, replace EIC and fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

Note. Test sequence skips from TEST 48B to TEST 48D. No test procedures have been omitted.

TEST 48D - REPAIRING INSTRUMENT CLUSTER BATTER POWER SUPPLY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Replace IOD fuse in Power Distribution Center (PDC). PDC is located in front of left front strut tower. Remove and inspect new IOD fuse. If fuse is open, go to step 5). If fuse is okay, go to next step.
2. Reinstall IOD fuse. If vehicle is not equipped with power door locks or power mirrors, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If vehicle is equipped with either power door locks or power mirrors, go to next step.
3. If vehicle is not equipped with power door locks, go to next step. Depress any door lock switch to LOCK position then to UNLOCK position. If door locks do not operate properly, reconnect all disconnected components and go to «TEST 19A»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-19a-identifying-power-door) . If vehicle is not equipped with power mirrors, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If vehicle is equipped with power mirrors, go to next step.
4. Operate power mirrors in all directions. Remove and inspect IOD fuse. If fuse is open, see POWER MIRRORS under ACCESSORIES & EQUIPMENT to repair short in power mirror switch circuits. If fuse is okay, system is operating properly. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
5. Ensure courtesy light switch, located on slider dimmer switch, is off. Ensure hood is closed. Ensure vanity mirror and glove box lights are off. Close all doors. Disconnect Black left pod switch connector. Go to next step.
6. Using DRB in ohmmeter mode, check resistance of fused battery feed circuit (Pink wire) at IOD fuse. If resistance is less than 5 ohms, go to step 8). If resistance is more than 5 ohms, go to next step.
7. Check resistance of courtesy light switch output circuit (Pink/Light Blue wire) at Black left pod switch connector. If resistance is less than 5 ohms, repair short to ground in Pink/Light Blue wire and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, repair short to ground in Pink wire and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
8. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Using DRB in ohmmeter mode, check resistance of fused battery feed circuit (Pink wire) at IOD fuse. If resistance is more than 5 ohms, replace BCM and IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
9. Disconnect Electronic Instrument Cluster (EIC) connector. Check resistance of fused battery feed circuit (Pink wire) at IOD fuse. If resistance is more than 5 ohms, replace EIC and IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
10. Disconnect vehicle radio. Using DRB in ohmmeter mode, check resistance of fused battery feed circuit (Pink wire) at IOD fuse. If resistance is more than 5 ohms, replace vehicle radio and IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, repair short to ground in Pink wire and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 49A - REPAIRING BODY CONTROL MODULE (BCM) NO RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Blue Body Control Module (BCM) connector. BCM is located behind center console. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If connector is okay, go to next step.
2. Leave Data Link Connector (DLC) connected in following steps. Using an external ohmmeter, check resistance of CCD BUS positive circuit (Violet/Brown wire) between Blue BCM connector terminal No. 14 and DLC terminal No. 4. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Check resistance on CCD BUS negative circuit (White/Black wire) between Blue BCM connector terminal No. 15 and DLC terminal No. 3. If resistance is more than 5 ohms, repair open White/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
4. Using DRB in ohmmeter mode, check resistance of signal ground circuit (Black/Light Green wire) at Blue BCM connector terminal No. 13. If resistance is more than 5 ohms, repair open Black/Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
5. Using DRB in voltmeter mode, check voltage on fused ignition feed circuit (Dark Blue/White wire) at Blue BCM connector terminal No. 12. If voltage is less than 10 volts, go to «TEST 49B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-49b-repairing-bcm-ignition) . If voltage is more than 10 volts, go to next step.
6. Check voltage of fused battery feed circuit (Pink wire) at Blue BCM connector terminal No. 16. If voltage is more than 10 volts, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, go to next step.
7. Remove and inspect IOD fuse. If fuse is blown, go to «TEST 49C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-49c-repairing-bcm-battery) . If fuse is okay, reinstall IOD fuse and go to next step.
8. Check voltage of battery feed circuit (Black/Red wire) at IOD fuse. If voltage is more than 10 volts, repair open Pink wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair open Black/Red wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 49B - REPAIRING BCM IGNITION POWER SUPPLY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Remove and inspect fuse No. 15 from fuse block. If fuse is blown, go to step 3). If fuse is okay, reinstall fuse No. 15. Ensure ignition is on and go to next step.
2. Using DRB in voltmeter mode, check voltage of ignition switch output circuit (Dark Blue wire) at fuse No. 15. If voltage is more than 10 volts, repair open Dark Blue/White wire between fuse No. 15 and Body Control Module (BCM). Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, repair open Dark Blue wire between fuse No. 15 and ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
3. Turn ignition off. Using DRB in ohmmeter mode, check resistance of fused ignition feed circuit (Dark Blue/White wire) at fuse No. 15. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire and replace fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
4. Reconnect Blue BCM connector. Check resistance of fused ignition feed circuit (Dark Blue/White wire) at fuse No. 15. If resistance is less than 5 ohms, replace BCM and fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace fuse No. 15. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 49C - REPAIRING BCM BATTERY POWER SUPPLY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Ensure courtesy light switch, located on slider dimmer switch, is off. Ensure vanity mirror, glove box, and all courtesy lights are off. Close all doors except left front door. Go to next step. NOTE: Ensure left front door ajar switch is held in CLOSED position in following step.
2. Using DRB in ohmmeter mode, check resistance of fused battery supply circuit (Pink wire) at IOD fuse. If resistance is less than 5 ohms, repair short to ground in Pink wire and replace IOD fuse. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, go to next step.
3. Reconnect Blue Body Control Module (BCM) connector. Using DRB in ohmmeter mode, check resistance of fused battery feed circuit (Pink wire) at IOD fuse. If resistance is more than 5 ohms, replace IOD fuse. Perform 6 «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 50A - COMPASS/MINI TRIP MODULE NO RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect compass/mini trip module connector. Check connector, and clean or repair connector as necessary. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .If connector is okay, go to next step.
2. Using DRB in ohmmeter mode, check resistance of system ground circuit (Black/Light Green wire) at compass/mini trip module connector terminal No. 5. If resistance is more than 5 ohms, repair open Black/Light Green wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Turn ignition on. Using DRB in voltmeter mode, check voltage on fused ignition switch output circuit (Tan wire) at compass/mini trip module connector terminal No. 7. If voltage is less than 10 volts, go to step 6). If voltage is more than 10 volts, go to next step.
4. Connect a jumper wire between CCD BUS negative circuit (White/Black wire) at compass/mini trip module connector terminal No. 11 and Ground. Using DRB, read CCD BUS status. If DRB does not display BUS SHORTED TO 6GROUND, repair open White/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays BUS SHORTED TO GROUND, go to next step.
5. Disconnect jumper wire. Connect jumper wire between CCD BUS positive circuit (Violet/Brown wire) at compass/mini trip module connector terminal No. 12 and ground. If DRB does not display BUS SHORTED TO GROUND, repair open Violet/Brown wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If DRB displays BUS SHORTED TO GROUND, replace compass/mini trip module. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
6. Remove and inspect fuse No. 7 from fuse block. If fuse is okay, go to step 7). If fuse is open, turn ignition off. Using DRB in ohmmeter mode, check resistance of fused ignition switch output circuit (Tan wire) at fuse No. 7 connector. If resistance is less than 5 ohms, repair short to ground in Tan wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is more than 5 ohms, replace fuse No. 7. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .
7. Using DRB in voltmeter mode, check voltage on ignition switch output circuit (Black/White wire) at fuse No. 7 connector. If voltage is less than 10 volts, repair short to ground in Black/White wire from fuse panel to ignition switch. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If voltage is less than 10 volts, replace fuse No. 7. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST 51A - REPAIRING PCM NO RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located between data link connector and battery on fenderwell. DO NOT disconnect DRB from Data Link Connector (DLC). Go to next step.
2. Using an external ohmmeter, check resistance on CCD BUS positive circuit (Violet/Brown wire) between PCM connector terminal No. 26 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, go to next step.
3. Check resistance on CCD BUS negative circuit (White/Black wire) between PCM connector terminal No. 46 and DLC. If resistance is more than 5 ohms, repair open White/Black wire. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) . If resistance is less than 5 ohms, replace PCM. Perform «TEST VER-1B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1b-verification-procedure) .

TEST VER-1B - VERIFICATION PROCEDURE

Ensure ignition is off. Reconnect all previously disconnected components and connectors. Ensure all repairs have been made. Turn ignition on. Actuate system that was not operational. If system operates properly, repair is complete. If system does not operate properly, go to TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS .

Note. Some vehicles may not have specific module/system listed in test. If vehicle is not equipped with module/system specified in test step, proceed to next step. For module/system options available, see MODULE APPLICATIONS table.

MODULE APPLICATIONS

VEHICLE COMMUNICATIONS TESTS

Note. In the following self-diagnostic tests, illustrations are courtesy of Chrysler Corp. TEST VER-1 - VERIFICATION PROCEDURE is near end of article.

TEST 1A - TROUBLE CODES

Battery must be fully charged before proceeding. Trouble codes displayed will fit 2 categories: DRB trouble codes and CCD BUS trouble codes. Connect DRB to data link connector to read trouble codes. See TROUBLE CODES table and proceed to appropriate test. If DRB screen is blank, go to TEST 2A - BLANK DRB MESSAGE SCREEN .

TROUBLE CODES

TEST 2A - BLANK DRB MESSAGE SCREEN

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Disconnect DRB. Using an external voltmeter, check Chrysler Collision Detection (CCD) Data Link Connector (DLC) positive battery circuit (Red wire) for voltage. Connector is located underneath dash at left side of steering column. If voltage is less than 10 volts, repair positive battery circuit as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If voltage is more than 10 volts, turn ignition off. Using an external ohmmeter, check resistance between CCD DLC ground circuit (Black/Light Green wire) and ground. If resistance is more than 20 ohms, repair open ground circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If resistance is less than 20 ohms, try a different DRB cable. If DRB screen is no longer blank, replace defective DRB cable. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If DRB screen is still blank, try a different DRB cartridge. If DRB screen is no longer blank, replace defective DRB cartridge. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB screen is still blank, replace defective DRB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 3A - RAM TEST FAILURE

1. Disconnect and reconnect DRB. DO NOT touch keypad. If DRB does not display RAM TEST FAILURE, proceed to next step. If DRB displays RAM TEST FAILURE, replace DRB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . Return to TEST 1A - TROUBLE CODES.
2. If DRB displays KEY PAD TEST FAILURE, replace DRB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB does not display KEY PAD TEST FAILURE, return to TEST 1A - TROUBLE CODES.

TEST 4A - CARTRIDGE ERROR

1. Disconnect and reconnect DRB. DO NOT touch keypad. If DRB does not display CARTRIDGE ERROR, proceed to next step. If DRB displays CARTRIDGE ERROR, replace DRB cartridge. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . Return to «TEST 1A - TROUBLE CODES»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-1a-trouble-codes) .
2. If DRB displays KEY PAD TEST FAILURE, replace DRB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB does not display KEY PAD TEST FAILURE, return to TEST 1A - TROUBLE CODES.

TEST 5A - KEY PAD TEST FAILURE

Disconnect and reconnect DRB. DO NOT touch keypad. If DRB does not display KEY PAD TEST FAILURE, return to TEST 1A - TROUBLE CODES . If DRB dis-plays KEY PAD TEST FAILURE, replace DRB. Perform TEST VER-1 .

TEST 6A - LOW/HIGH BATTERY

Using an external voltmeter, check battery voltage. If battery voltage is 11.7-13.0 volts, replace DRB. Perform TEST VER-1 . If battery voltage is not 11.7-13.0 volts, repair charging system as necessary.

TEST 7A - SHORT TO BATTERY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, indicate whether vehicle is equipped with specific module. For module/system options available, refer to the «MODULE APPLICATIONS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table under IDENTIFICATION. Turn ignition off. Disconnect Transmission Control Module (TCM) connector, if equipped. TCM is located on left side of engine compartment near cowl. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, replace TCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located on fenderwell between CCD Data Link Connector (DLC) and battery.
3. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, go to «TEST 7B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-7b-short-to-battery) . If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped.
4. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, go to «TEST 7C»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-7c-short-to-battery) . If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC) connector. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, go to «TEST 7E»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-7e-short-to-battery) . If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect Vehicle Theft Security System (VTSS) module connector, if equipped.
5. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect compass/mini trip module connector, if equipped. Compass/mini trip module is located at center of roof, above visors. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, replace compass/mini trip module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect Automatic Temperature Control module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, replace ATC control module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If DRB displays BUS SHORT TO BATTERY, turn ignition off. Disconnect Body Control Module (BCM) connectors, if equipped. BCM is located behind knee panel below dashboard. Turn ignition on. If DRB does not display BUS SHORT TO BATTERY, go to «TEST 7F»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-7f-short-to-battery) . If DRB displays BUS SHORT TO BATTERY, disconnect DRB.
8. Using an external voltmeter, check voltage between CCD DLC, CCD BUS positive circuit (Violet/Brown wire) and ground. If voltage is more than 8 volts, repair short to voltage in CCD BUS positive circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
9. If voltage is less than 8 volts, check voltage between CCD DLC, CCD BUS negative circuit (White/Black wire) and ground.
10. If voltage is more than 8 volts, repair short to voltage in CCD BUS negative circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If voltage is less than 8 volts, replace DRB cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 7B - SHORT TO BATTERY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using an external ohmmeter, check resistance between Powertrain Control Module (PCM) connector terminals No. 26, CCD BUS positive circuit (Violet/Brown wire), and No. 7, 8-volt supply circuit (Orange wire). If resistance is less than 5 ohms, repair short between Violet/Brown wire and White/Black or Orange wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If resistance is more than 5 ohms, check resistance between PCM connector terminals No. 46, CCD BUS negative circuit (White/Black wire), and No. 7, 8-volt supply circuit (Orange wire).
3. If resistance is less than 5 ohms, repair short between White/Gray or White/Black wire and White/Gray or Orange wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is more than 5 ohms, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 7C - SHORT TO BATTERY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB in voltmeter mode, check voltage at Controller Anti-Lock Brake (CAB) module connector terminal No. 41, pedal travel sensor return circuit (Red/Black wire).
2. If voltage is more than 10 volts, repair short to voltage in Red/Black wire and replace CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If voltage is less than 10 volts, replace CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

Note. Test procedures skip from TEST 7C to TEST 7E. No test procedures have been omitted.

TEST 7E - SHORT TO BATTERY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB in ohmmeter mode, check instrument cluster connector ground circuit (Black/Light Green wire).
2. If resistance is more than 5 ohms, repair open circuit in Black/Light Green wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace instrument cluster. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 7F - SHORT TO BATTERY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using an external ohmmeter, check resistance between BCM Blue connector terminals No. 14, CCD BUS positive circuit (Violet/Brown wire), and No. 19, key-in light driver circuit (Yellow/Red wire). If resistance is less than 5 ohms, repair Violet/Brown wire shorted to Yellow/Red wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 15, CCD BUS negative circuit (White/Black wire), and No. 19, key-in light driver circuit (Yellow/Red wire). If resistance is less than 5 ohms, repair White/Black wire shorted to Yellow/Red wire. Perform 6 «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 14, CCD BUS positive circuit (Violet/Brown wire), and No. 21, seat belt light output circuit (Dark Blue/Red wire). If resistance is less than 5 ohms, repair Violet/Brown shorted to Dark Blue/Red wires. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 15, CCD BUS negative circuit (White/Black wire), and No. 21, seat belt light driver circuit (Dark Blue/Red wire). If resistance is less than 5 ohms, repair White/Black shorted to Dark Blue/Red wires. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If resistance is more than 5 ohms, use DRB in ohmmeter mode to check resistance between BCM case and ground. If resistance is more than 5 ohms, repair BCM case ground. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If resistance is less than 5 ohms, check resistance of Blue BCM connector terminal No. 13, ground circuit (Black/Light Green wire). If resistance is more than 15 ohms, repair open Black/Light Green wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 15 ohms, replace BCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 8A - SHORT TO 5 VOLTS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, indicate whether vehicle is equipped with specific module. For module/system options available, refer to the «MODULE APPLICATIONS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table under IDENTIFICATION. Turn ignition off. Disconnect Transmission Control Module (TCM) connector, if equipped. TCM is located on left side of engine compartment, near cowl. Turn ignition to RUN position. If DRB does not display BUS SHORT TO 5 VOLTS, replace TCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located between Data Link Connector (DLC) and battery, on fenderwell. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, proceed to «TEST 8B - SHORT TO 5 VOLTS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8b-short-to-5) .
3. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, replace CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC) connector. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, go to «TEST 8E - SHORT TO 5 VOLTS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8e-short-to-5) .
5. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Vehicle Theft Security System (VTSS) module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect compass/mini-trip module connector, if equipped. Compass/mini-trip module is located at center of roof, above visors. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, replace compass/mini-trip module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Overhead Travel Information System (OTIS) module connector, if equipped. OTIS module is located at center of roof, above visors. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, replace OTIS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
8. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Automatic Temperature Control (ATC) module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, go to «TEST 8F - SHORT TO 5 VOLTS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8f-short-to-5) .
9. If DRB displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Body Control Module (BCM) connectors, if equipped. BCM is located under lower knee panel of dashboard. Turn ignition on. If DRB does not display BUS SHORT TO 5 VOLTS, go to «TEST 8G»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-8g-short-to-5) . If DRB displays BUS SHORT TO 5 VOLTS, disconnect DRB.
10. Using an external voltmeter, check voltage between CCD DLC, CCD BUS positive circuit (Violet/Brown wire) and ground. If voltage is more than 8 volts, repair short to voltage in CCD BUS positive circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
11. If voltage is less than 8 volts, check voltage between CCD DLC, CCD BUS negative circuit (White/Black wire) and ground.
12. If voltage is more than 8 volts, repair short to voltage in CCD BUS negative circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If voltage is less than 8 volts, replace DRB cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 8B - SHORT TO 5 VOLTS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using an external ohmmeter, check resistance between Powertrain Control Module (PCM) connector terminals No. 26, CCD BUS positive circuit (Violet/Brown wire), and No. 6, 5-volt supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair Violet/Brown wire shorted to Violet/White wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If resistance is more than 5 ohms, check resistance between PCM connector terminals No. 46, CCD BUS negative circuit (White/Black wire), and No. 6, 5-volt supply circuit (Violet/White wire).
3. If resistance is less than 5 ohms, repair White/Black shorted to Violet/White wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is more than 5 ohms, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

Note. Test procedures skip from TEST 8B to TEST 8E. No test procedures have been omitted.

TEST 8E - SHORT TO 5 VOLTS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Using DRB in ohmmeter mode, check resistance at instrument cluster connector, ground circuit (Black/Light Green wire). If resistance is more than 5 ohms, repair open circuit in Black/Light Green wire. Perform TEST VER-1 . If resistance is less than 5 ohms, replace MIC or EIC. Perform TEST VER-1 .

TEST 8F - SHORT TO 5 VOLTS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB in ohmmeter mode, check resistance at Automatic Temperature Control (ATC) module connector ground circuit (Black wire).
2. If resistance is more than 5 ohms, repair open circuit in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace ATC module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 8G - SHORT TO 5 VOLTS

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using an external ohmmeter, check resistance between Blue Body Control Module (BCM) connector terminals No. 2, left front door ajar switch sense circuit (Tan wire), and No. 14, CCD BUS positive circuit (Violet/Brown wire). If resistance is less than 5 ohms, repair Tan wire shorted to Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 2, left front door ajar switch sense circuit (Tan wire), and No. 15, CCD BUS negative circuit (White/Black wire). If resistance is less than 5 ohms, repair Tan wire shorted to White/Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 4, key-in ignition switch sense circuit (Light Blue wire), and No. 14, CCD BUS positive circuit (Violet/Brown wire). If resistance is less than 5 ohms, repair Light Blue wire shorted to Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 4, key-in ignition switch sense circuit (Light Blue wire), and No. 15, CCD BUS negative circuit (White/Black wire). If resistance is less than 5 ohms, repair Light Blue wire shorted to White/Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 3, seat belt switch sense circuit (Light Green/Red wire), and No. 14, CCD BUS positive circuit (Violet/Brown wire). If resistance is less than 5 ohms, repair Light Green/Red wire shorted to Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If resistance is more than 5 ohms, check resistance between Blue BCM connector terminals No. 3, seat belt switch sense circuit (Light Green/Red wire), and No. 15, CCD BUS negative circuit (White/Black wire). If resistance is less than 5 ohms, repair Light Green/Red wire shorted to White/Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If resistance is more than 5 ohms, check resistance between BCM case and ground using DRB in ohmmeter mode. If resistance is more than 5 ohms, repair BCM case ground. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, check resistance between Blue BCM connector terminal No. 13, ground circuit (Black/Light Green wire), and ground.
8. If resistance is more than 15 ohms, repair open Black/Light Green wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 15 ohms, replace BCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 9A - SHORT TO GROUND

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, indicate whether vehicle is equipped with specific module. For module/system options available, refer to the «MODULE APPLICATIONS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table under IDENTIFICATION. Turn ignition off. Disconnect Transmission Control Module (TCM) connector, if equipped. TCM is located on left side of engine compartment, near cowl. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace TCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located between Data Link Connector (DLC) and battery, on fenderwell. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, go to «TEST 9B»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-9b-short-to-ground) .
4. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC) connector. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace MIC or EIC. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect Vehicle Theft Security System (VTSS) module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect compass/mini-trip module connector, if equipped. Compass/mini-trip module is located at center of roof, above visors. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace compass/mini-trip module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect Automatic Temperature Control (ATC) module connector, if equipped. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace ATC module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
8. If DRB displays BUS SHORT TO GROUND, turn ignition off. Disconnect Body Control Module (BCM) connectors, if equipped. BCM is located under lower knee panel of dashboard. Turn ignition on. If DRB does not display BUS SHORT TO GROUND, replace BCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB displays BUS SHORT TO GROUND, disconnect DRB.
9. Using an external ohmmeter, check resistance between CCD DLC, CCD BUS positive circuit (Violet/Brown wire) and ground. If resistance is more than 5 ohms, repair short to ground in CCD BUS positive circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
10. If resistance is less than 5 ohms, check resistance between CCD DLC, CCD BUS negative circuit (White/Black wire) and ground.
11. If resistance is more than 5 ohms, repair short to ground in CCD BUS negative circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace DRB cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 9B - SHORT TO GROUND

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Using DRB in voltmeter mode, check voltage at CAB connector terminal No. 41, pedal travel sensor return circuit (Red/Black wire). If voltage is more than 10 volts, repair short to voltage in Red/Black wire and replace CAB module. Perform TEST VER-1 . If voltage is less than 10 volts, replace CAB module. Perform TEST VER-1 .

TEST 10A - BUS + & BUS - SHORTED TOGETHER

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, indicate whether vehicle is equipped with specific module. For module/system options available, refer to the «MODULE APPLICATIONS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table under IDENTIFICATION. Turn ignition off. Disconnect Transmission Control Module (TCM) connector, if equipped. TCM is located on left side of engine compartment, near cowl.
2. Turn ignition on. If DRB does not display BUS + & BUS -SHORTED TOGETHER, replace TCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located between Data Link Connector (DLC) and battery, on fenderwell. Turn ignition on. If DRB does not display BUS + & BUS -SHORTED TOGETHER, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped. Turn ignition on. If DRB does not display BUS + & BUS - SHORTED TOGETHER, replace CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC) connector. Turn ignition on. If DRB does not display BUS + & BUS - SHORTED TOGETHER, replace MIC or EIC. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect Vehicle Theft Security System (VTSS) module connector, if equipped. Turn ignition on. If DRB does not display BUS + & BUS - SHORTED TOGETHER, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect compass/mini-trip module connector, if equipped. Compass/mini-trip module is located at center of roof, above visors. Turn ignition on. If DRB does not display BUS + & BUS - SHORTED TOGETHER, replace compass/mini-trip module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
8. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect Automatic Temperature Control (ATC) module connector, if equipped. Turn ignition on. If DRB does not display BUS + & BUS - SHORTED TOGETHER, replace ATC module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
9. If DRB displays BUS + & BUS - SHORTED TOGETHER, turn ignition off. Disconnect Body Control Module (BCM) connectors, if equipped. BCM is located under lower knee panel of dashboard. Turn ignition on. If DRB does not display BUS + & BUS - SHORTED TOGETHER, replace BCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB displays BUS + & BUS - SHORTED TOGETHER, disconnect DRB.
10. Using an external ohmmeter, check resistance between CCD DLC, CCD BUS positive circuit (Violet/Brown wire) and ground. If resistance is more than 5 ohms, repair short to ground in CCD BUS positive circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
11. If resistance is less than 5 ohms, check resistance between CCD DLC, CCD BUS negative circuit (White/Black wire) and ground.
12. If resistance is more than 5 ohms, repair short to ground in CCD BUS negative circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace DRB cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 11A - NO TERMINATION

NO TERMINATION trouble code test is separated by body code. See NO TERMINATION TEST APPLICATIONS table for appropriate test number by body code.

NO TERMINATION TEST APPLICATIONS

Note. Test procedures skip from TEST 11A to TEST 11E. No test procedures have been omitted.

TEST 11F - NO TERMINATION (EXC WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

Scheme 61

1. Turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between PCM pins No. 26 and 46. If resistance is not 100-140 ohms, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
2. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between PCM connector terminal No. 26 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
3. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between PCM connector terminal No. 46 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
4. If resistance is less than 5 ohms and vehicle is not equipped with anti-lock brakes, go to step 8). If resistance is less than 5 ohms and vehicle is equipped with anti-lock brakes, disconnect Controller Anti-Lock Brake (CAB) module connector. Check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
5. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
6. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, go to next step.
7. If vehicle is not equipped with a Vehicle Theft Security System (VTSS) module, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If vehicle is equipped with a VTSS module, go to next step.
8. Disconnect VTSS module connector. Check resistance between VTSS module pins No. 1 and 2. (Scheme 61) (Scheme 61): Identifying VTSS Module Pins
9. If resistance is not 100-140 ohms, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between VTSS module connector terminal No. 2 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
10. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between VTSS module connector terminal No. 1 and DLC.
11. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).

Note. Test procedures skip from TEST 11F to TEST 11J. No test procedures have been omitted.

TEST 11J - NO TERMINATION (WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Disconnect Controller Anti-Lock Brake (CAB) module connector. Using an external ohmmeter, check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (White/Violet wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open White/Violet wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (Orange wire) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open Orange wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 12A - BUS BIAS LEVEL OR BUS (+/-) OPEN

BUS BIAS LEVEL OR BUS (+/-) OPEN trouble code test is separated by body code. See BUS BIAS LEVEL OR BUS (+/-) OPEN TEST APPLICATIONS table.

BUS BIAS LEVEL OR BUS (+/-) OPEN TEST APPLICATIONS

Note. Test procedures skip from TEST 12A to TEST 12E. No test procedures have been omitted.

TEST 12F - BUS BIAS LEVEL OR BUS (+/-) OPEN (EXC WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

This test covers following BUS BIAS LEVEL OR BUS (+/-) OPEN trouble codes. Ignition off during BUS test is the most common cause for these messages.

1. BUS BIAS LEVEL TOO LOW
2. BUS BIAS LEVEL TOO HIGH
3. BUS + OPEN
4. BUS - OPEN
5. BUS + & BUS - OPEN If ignition was off, turn ignition on (engine off). If ignition was on, disconnect Automatic Temperature Control (ATC) module connector, if equipped. Disconnect scan tool from Data Link Connector (DLC). Using an external voltmeter, check voltage between Data Link Connector (DLC), CCD BUS positive circuit (Violet/Brown wire) and ground. If voltage is not 2.3-2.6 volts, go to step 3). If voltage is 2.3-2.6 volts, check voltage between DLC, CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) and ground. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between PCM pins No. 26 and 46. If resistance is not 100-140 ohms, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between PCM connector terminal No. 26 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between PCM connector terminal No. 46 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, disconnect Vehicle Theft Security System (VTSS) module connector, if equipped. If vehicle is not equipped with VTSS, go to step 12). Using an external ohmmeter, check resistance between VTSS module pins No. 1 and 2. (Scheme 61) If resistance is not 100-140 ohms, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between VTSS module connector terminal No. 2 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between VTSS module connector terminal No. 1 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on VTSS module connector terminal No. 3, fused ignition switch output circuit (Dark Blue/White wire on XJ body; White/Black wire on ZJ body). If voltage is less than 10 volts, repair open fused ignition switch output circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of VTSS module connector terminals No. 11 or 19, system ground circuit (Black wire). If resistance is more than 5 ohms, repair open to ground in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector. Check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on CAB connector terminal No. 53, fused ignition switch output circuit (Light Green/Yellow wire on XJ body; Light Green/Dark Green wire on ZJ body). If voltage is less than 10 volts, repair open fused ignition switch output wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CAB connector terminal No. 1, ground circuit (Black wire). If resistance is more than 5 ohms, repair open to ground in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 5 ohms, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).

Note. Test procedures skip from TEST 12F to TEST 12J. No test procedures have been omitted.

TEST 12J - BUS BIAS LEVEL OR BUS (+/-) OPEN (WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

This test covers following BUS BIAS LEVEL OR BUS (+/-) OPEN trouble codes. Ignition off during BUS test is the most common cause for these messages.

1. BUS BIAS LEVEL TOO LOW
2. BUS BIAS LEVEL TOO HIGH
3. BUS + OPEN
4. BUS - OPEN
5. BUS + & BUS - OPEN If ignition was off, turn ignition on (engine off). If ignition was on, disconnect scan tool from Data Link Connector (DLC). Using an external voltmeter, check voltage between Data Link Connector (DLC), CCD BUS positive circuit (White/Violet wire) and ground. If voltage is not 2.3-2.6 volts, go to step 3). If voltage is 2.3-2.6 volts, check voltage between DLC, CCD BUS negative circuit (Orange wire) and ground. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped. Check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (White/Violet wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open White/Violet wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (Orange wire) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open Orange wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on CAB connector terminal No. 53, fused ignition switch output circuit (Yellow/Dark Green wire). If voltage is less than 10 volts, repair open Yellow/Dark Green wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CAB connector terminal No. 1, ground circuit (Black wire). If resistance is more than 5 ohms, repair open to ground in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 13A - NO BUS BIAS

NO BUS BIAS trouble code test is separated by body classification. See NO BUS BIAS TEST APPLICATIONS table.

NO BUS BIAS TEST APPLICATIONS

Note. Test procedures skip from TEST 13A to TEST 13F. No test procedures have been omitted.

TEST 13F - NO BUS BIAS (EXC WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Ignition off during BUS test is the most common cause for this message. If ignition was off, turn ignition on (engine off). If ignition was on, disconnect scan tool from Data Link Connector (DLC). Disconnect Powertrain Control Module (PCM) connector. Using an external voltmeter, check voltage of CCD BUS positive circuit (Violet/Brown wire) between DLC and ground. If voltage is not 2.3-2.6 volts, go to step 3).
2. If voltage is 2.3-2.6 volts, check voltage of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between DLC and ground. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If vehicle is not equipped with anti-lock brakes, go to «TEST 13G»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-13g-no-bus-bias) . If vehicle is equipped with anti-lock brakes, disconnect Controller Anti-Lock Brake (CAB) module connector. Check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, go to next step.
6. If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on CAB connector terminal No. 53, fused ignition switch output circuit (Light Green/Yellow wire on XJ body; Light Green/Dark Green wire on ZJ body). If voltage is less than 10 volts, repair open fused ignition switch output circuit. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CAB connector terminal No. 1, ground circuit (Black wire). If resistance is more than 5 ohms, repair open to ground in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 13G - NO BUS BIAS (EXC WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Disconnect VTSS module connector. Check resistance between VTSS module pins No. 1 and 2. (Scheme 61)
2. If resistance is not 100-140 ohms, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between VTSS module connector terminal No. 2 and Data Link Connector (DLC). If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
3. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between VTSS module connector No. 1 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire.
4. If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on VTSS module connector terminal No. 3, fused ignition switch output circuit (Dark Blue/White wire on XJ body; White/Black wire on ZJ body). If voltage is less than 10 volts, repair open fused ignition switch output wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).
5. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of VTSS module connector terminal No. 11, system ground circuit (Black wire). If resistance is more than 15 ohms, repair open to ground in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure). If resistance is less than 15 ohms, replace VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure).

Note. Test procedures skip from TEST 13G to TEST 13J. No test procedures have been omitted.

TEST 13J - NO BUS BIAS (WRANGLER)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION in this article. For appropriate wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Ignition off during BUS test is the most common cause for this message. If ignition was off, turn ignition on (engine off). If ignition was on, disconnect scan tool from Data Link Connector (DLC). Using an external voltmeter, check voltage between Data Link Connector (DLC), CCD BUS positive circuit (White/Violet wire) and ground. If voltage is not 2.3-2.6 volts, go to step 3).
2. If voltage is 2.3-2.6 volts, check voltage between DLC CCD BUS negative circuit (Orange wire) and ground. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped. Check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (White/Violet wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open White/Violet wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (Orange wire) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open Orange wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on CAB connector terminal No. 53, fused ignition switch output circuit (Yellow/Dark Green wire). If voltage is less than 10 volts, repair Yellow/Dark Green wire as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CAB connector terminal No. 1, ground circuit (Black wire). If resistance is more than 5 ohms, repair open to ground in Black wire. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If resistance is less than 5 ohms, replace CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST 14A - NOT RECEIVING BUS MESSAGES CORRECTLY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

1. Using DRB, indicate whether vehicle is equipped with specific module. For module/system options available, refer to the «MODULE APPLICATIONS»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer) table under IDENTIFICATION. Turn ignition off. Disconnect Transmission Control Module (TCM) connector, if equipped. TCM is located on left side of engine compartment, near cowl. Turn ignition on. If DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace TCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
2. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located between Data Link Connector (DLC) and battery, on fenderwell. Turn ignition on. If DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace PCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
3. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector, if equipped. Turn ignition on. If the DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace the CAB module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
4. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC) connector. Turn ignition on. If DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace MIC or EIC. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
5. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect Vehicle Theft Security System (VTSS) module connector, if equipped. Turn ignition on. If the DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace the VTSS module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
6. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect compass/mini-trip module connector, if equipped. Compass/mini-trip module is located at center of roof, above visors. Turn ignition on. If the DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace the compass/mini-trip module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
7. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect Automatic Temperature Control (ATC) module connector, if equipped. Turn ignition on. If the DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace the ATC module. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .
8. If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, turn ignition off. Disconnect Body Control Module (BCM) connector, if equipped. BCM is located behind right knee panel below dashboard.
9. Turn ignition on. If DRB does not display NOT RECEIVING BUS MESSAGES CORRECTLY, replace BCM. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) . If DRB displays NOT RECEIVING BUS MESSAGES CORRECTLY, replace DRB cable or cartridge as necessary. Perform «TEST VER-1»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-ver-1-verification-procedure) .

TEST VER-1 - VERIFICATION PROCEDURE

1. Ensure ignition is off and DRB is connected. Reconnect all previously disconnected components and connectors. Turn ignition on. If DRB screen is blank, go to «TEST 2A - BLANK DRB MESSAGE SCREEN»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-2a-blank-drb-message) . If DRB screen is not blank, go to next step.
2. If there is a BUS failure message on DRB, go back to «TEST 1A - TROUBLE CODES»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-1a-trouble-codes) . If there is no BUS failure message on DRB, select module in question. If DRB shows NO RESPONSE, go back to «TEST 1A - TROUBLE CODES»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-1a-trouble-codes) .
3. If DRB does not show NO RESPONSE, inspect vehicle for original complaint. If original complaint is present, go to «TEST 1A - TROUBLE CODES»(/jeep/grand-cherokee/zj-1992-1996/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__test-1a-trouble-codes) . If original complaint is not present, repair is complete.

Wiring Diagram (2.5L & 4.0L - Cherokee - 1 Of 2). Scheme 62

Wiring Diagram (2.5L & 4.0L - Cherokee - 2 Of 2). Scheme 63

Wiring Diagram (2.5L & 4.0L - Wrangler - 1 Of 2). Scheme 64

Wiring Diagram (2.5L & 4.0L - Wrangler - 2 Of 2). Scheme 65

Wiring Diagram (4.0L - Grand Cherokee - 1 Of 2). Scheme 66

Wiring Diagram (4.0L - Grand Cherokee - 2 Of 2). Scheme 67

Wiring Diagram (5.2L - Grand Cherokee - 1 Of 2). Scheme 68

Wiring Diagram (5.2L - Grand Cherokee - 2 Of 2). Scheme 69

See also:
• COMPUTER RELEARN PROCEDURES
• ENTERING ON-BOARD DIAGNOSTICS
• TEST VER-1
• PRETEST INSPECTION
• TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS
• VEHICLE COMMUNICATIONS
• TEST 1A - TROUBLE CODES
• TEST 48A
• WIRING DIAGRAMS
• TEST VER-1B
• TEST 49A
• TEST 50A
• TEST 51A
• TEST 2A
• TEST 9A
• TEST 15A
• TEST 19A
• TEST 21A
• TEST 22A
• TEST 25A
• TEST 28A
• TEST 33A
• TEST 34A
• TEST 36A
• TEST 37A
• TEST 38A
• TEST 40A
• TEST 3A - ELECTRONIC INSTRUMENT CLUSTER (EIC) TROUBLE CODES
• TEST 4A - ELECTRONIC INSTRUMENT CLUSTER (EIC) PROBLEMS
• TEST 2B
• TEST 4B - EIC
• TEST 4C - EIC
• TEST 5A - EIC
• TEST 7A - EIC
• TEST 8A - EIC
• TEST 6A - EIC
• TEST 45A
• TEST 46A
• TEST 12D
• TEST 41A
• TEST 42A
• TEST 43A
• TEST 44A
• TEST 8C - REPAIRING SHORT
• TEST 8D - REPAIRING OPEN
• TEST 8F - REPAIRING OPEN
• TEST 8E - REPAIRING SHORT
• TEST 8B - REPAIRING PARK LIGHT OPERATION
• TEST 10A - FAULTY GAUGE
• TEST 11A - ELECTRO/MECH
• TEST 12A - FAULTY ELECTRO/MECH
• TEST 12E - REPAIRING FAULTY
• TEST 10B
• TEST 10C
• TEST 14A - REPAIRING VOLTAGE
• TEST 12B - FAULTY
• TEST 12C - REPAIRING INOPERATIVE
• TEST 13A - REPAIRING DOOR AJAR
• TEST 48B
• TEST 48D
• TEST 15B
• TEST 15C
• TEST 20A
• TEST 19B
• TEST 19C
• TEST 19D
• TEST 19E
• TEST 19F
• TEST 19G
• TEST 19H
• TEST 39B
• TEST 19J
• TEST 28C
• TEST 20B
• TEST 20C
• TEST 20D
• TEST 20E
• TEST 20F
• TEST 20G
• TEST 20H
• TEST 23A
• TEST 24A
• TEST 24B
• TEST 24C
• TEST 23B
• TEST 26A
• TEST 26B
• TEST 27A
• TEST 28B
• TEST 30A
• TEST 31A
• TEST 32A
• TEST 29A
• TEST 33B
• TEST 33C
• TEST 34B
• TEST 35A
• TEST 36C
• TEST 36D
• TEST 37B
• TEST 37C
• TEST 37D
• TEST 37E
• TEST 38B
• TEST 38C
• TEST 38D
• TEST 39A
• TEST 39C
• TEST 39D
• TEST 39E
• TEST 39F
• TEST 42B
• TEST 46B
• TEST 47A
• TEST 46C
• TEST 47B
• TEST 47C
• TEST 47D
• TEST 49B
• TEST 49C
• TEST 2A - BLANK DRB MESSAGE SCREEN
• TEST 3A - RAM TEST FAILURE
• TEST 4A - CARTRIDGE ERROR
• TEST 5A - KEY PAD TEST
• TEST 6A - LOW/HIGH BATTERY
• TEST 7A - SHORT TO BATTERY
• TEST 8A - SHORT TO 5 VOLTS
• TEST 10A - BUS + & BUS - SHORTED
• TEST 11A - NO TERMINATION
• TEST 12A - BUS BIAS LEVEL
• TEST 13A - NO BUS BIAS
• TEST 14A - NOT RECEIVING
• TEST 7B
• TEST 7C
• TEST 7E
• TEST 7F
• TEST 8B - SHORT TO 5 VOLTS
• TEST 8E - SHORT TO 5 VOLTS
• TEST 8F - SHORT TO 5 VOLTS
• TEST 8G
• TEST 9B
• TEST 11F
• TEST 11J
• TEST 12F
• TEST 12J
• TEST 13F
• TEST 13J
• TEST 13G