Body Control Computer: Overview Dodge Intrepid I

IDENTIFICATION

BODY IDENTIFICATION

DESCRIPTION & OPERATION

The body control computer 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 are relayed to the appropriate system module(s). This reduces the complexity of vehicle wiring and size of wiring harness. Body control computer systems covered in BODY CONTROL COMPUTER are as follows.

1. Chime system.
2. Door ajar system.
3. Exterior lighting.
4. Instrument cluster.
5. Lighting.
6. Intermittent wipers.
7. Message center.
8. Overhead Travel Information System (OTIS).
9. Power door locks.
10. Power windows.
11. Remote keyless entry.
12. Vehicle Information System.
13. Vehicle Theft Security System (VTSS).

Body control computer fault messages are accessed through 16-pin Data Link Connector (DLC) using Chrysler's Diagnostic Readout Box (DRB) scan tool or generic scan tool. DLC is located on left side of steering column, above brake pedal.

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB) scan tool. A generic scan tool may not be capable of performing all necessary test functions.

The Body Control Module (BCM) is located behind right side kick panel. BCM stores odometer information for electronic instrument cluster display and provides power and ground for a variety of systems.

BCM is the only module that has the capability of providing both "bias" and "termination" on the CCD bus system. Refer to CCD BUS SYSTEM . Systems are monitored by BCM through voltage drops.

Vehicle may be equipped with either a premium or base model BCM. Base body control computer is used on vehicles with a mechanical instrument cluster. Base BCM's only use 2 connectors.

Premium BCM can be identified by the presence of either the Automatic Temperature Control (ATC) system, Overhead Travel Information System (OTIS), or both. Premium BCM's use 3 connectors.

CONNECTOR IDENTIFICATION

Note. For terminal identification of body control system connectors use illustrations. (Scheme 1)- (Scheme 16). Connector terminal numbers are molded into connectors. If connector terminal identification differs from that shown in figure, use wire colors to ensure correct circuit is being tested.

CONNECTOR IDENTIFICATION DIRECTORY

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Note. Illustrations in following tests are courtesy of Chrysler Corp.

TEST 67A - FUEL GAUGE/LAMP OPERATION FULL AT ALL TIMES

Note. Perform TEST 55A or 58A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

1. Ensure fuel tank is not empty. Check if fuel gauge indicates empty continually. If fuel gauge does not indicate empty continually, go to next step. If fuel gauge indicates empty continually, go to «TEST 68A»(ref-138303-S28847570482002040400000) .
2. If fuel gauge displays between empty and full, go to «TEST 67B»(ref-138303-S10794536122002040400000) . If gauge displays full continually, go to next step.
3. Turn ignition on. Using scan tool, read fuel level sensor voltage. If voltage is more than 9 volts, replace fuel tank sending unit. If voltage is 9 volts or less, turn ignition off. Go to next step.
4. Turn ignition off. Disconnect Body Control Module (BCM) Gray connector. BCM is located behind right kick panel. Using scan tool in ohmmeter mode, measure resistance at terminal No. 23 (Dark Blue wire) on BCM Gray connector. If resistance is 5 ohms or greater, replace BCM. If resistance is less than 5 ohms, go to next step.
5. Determine if vehicle is flex fuel vehicle. If vehicle is flex fuel, go to next step. If vehicle is not flex fuel, repair short to ground in Dark Blue wire between fuel level sensor and BCM.
6. Disconnect flex fuel module connector. Flex fuel module is located in trunk, behind rear seat. Using scan tool in ohmmeter mode, measure resistance at terminal No. 23 (Dark Blue wire) on BCM Gray connector. If resistance is 5 ohms or greater, repair short to ground in Dark Blue wire between fuel level sensor and BCM. If resistance is less than 5 ohms, go to next step.
7. Using scan tool in ohmmeter mode, measure resistance at terminal No. 3 (Light Blue/Black wire) on flex fuel module connector. If resistance is less than 5 ohms, repair Light Blue/Black wire for short to ground. If resistance is 5 ohms or greater, go to next step.
8. Using scan tool in ohmmeter mode, measure resistance at terminal No. 5 (Black/Tan wire) on flex fuel module connector. If resistance is less than 5 ohms, repair open Black/Tan wire. If resistance is 5 ohms or greater, go to next step.
9. Turn ignition on. Using scan tool in voltmeter mode, measure voltage at terminal No. 6 (Red/White wire) on flex fuel module connector. If voltage is 10 volts or less, repair open Red/White wire. If voltage is greater than 10 volts, replace flex fuel module.

TEST 67B - INACCURATE FUEL GAUGE OPERATION

Note. Perform TEST 67A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

1. Using scan tool, read and record fuel level voltage. Add or remove 5 gallons of fuel. Read fuel level voltage. If fuel level voltage changed, system is currently functioning correctly. If voltage did not change, go to next step.
2. Remove fuel tank sending unit. Inspect fuel tank for contamination. Repair as needed. Inspect sending unit for bent or sticking float arm. Repair or replace as needed. If tank and float arm are okay, replace fuel tank sending unit.

TEST 68C - FUEL GAUGE/LAMP OPERATION

Note. Perform TEST 68A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

1. Gain access to Body Control Module (BCM). Turn ignition off. Disconnect BCM connectors. Turn ignition on. Go to next step.
2. Using scan tool in voltmeter mode, measure voltage at terminal No. 22 (Red/White wire) on BCM Bone connector. If voltage is 10 volts or less, repair open Red/White wire. If voltage is more than 10 volts, replace BCM.

TEST 105A - WIPER MOTOR HIGH SPEED OPERATION

Note. Perform TEST 103A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

1. Remove HI/LO wiper relay (relay No. 10) from Power Distribution Center (PDC). PDC is located on left front fender apron. see scheme 20 Using external voltmeter, measure voltage between ground and terminal "A" (Dark Blue wire) on HI/LO wiper relay socket. If voltage is 10 volts or less, repair open Dark Blue wire. If voltage is more than 10 volts, go to next step.
2. Turn wipers on HI speed. Measure voltage between terminals "A" (Dark Blue wire) and "C" (Violet wire) on HI/LO wiper relay socket. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, go to step 5).
3. Turn wipers on LO speed. Connect a jumper wire between terminals "B" (Light Green/Black wire) and "D" (Red/Yellow wire) on HI/LO wiper relay socket. If wipers operate in high speed mode, replace HI/LO relay. If wipers do not operate in high speed mode, go to next step.
4. Leave jumper wire connected. Disconnect wiper motor connector. Connector is located on engine compartment firewall, just right of power brake booster. Using voltmeter, measure voltage between ground and terminal No. 2 (Red/Yellow wire) on wiper motor connector. If voltage is 10 volts or less, repair open Red/Yellow wire. If voltage is more than 10 volts, replace wiper motor.
5. Install HI/LO relay. Gain access to Body Control Module (BCM). BCM is located behind right kick panel. Operate wipers in low speed mode. With BCM connectors connected, backprobe jumper wire between terminal No. 18 (Violet wire) on BCM Bone connector and ground. If wiper speed changes to high mode, go to next step. If wiper speed does not change, repair open Violet wire.
6. Disconnect jumper wire. Move wiper switch to high speed mode. Using scan tool in voltmeter mode, backprobe terminal No. 16 (Dark Green/Red wire) on BCM Bone connector. If voltage is more than 8 volts, replace BCM. If voltage is 8 volts or less, replace multifunction switch.

TEST 106A - WIPER MOTOR LOW SPEED OPERATION

Note. Perform TEST 103A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

1. Using scan tool, actuate wiper motor low speed. If wipers operate in low speed mode, go to step 6). If wipers do not operate in low speed, go to next step.
2. Remove HI/LO wiper relay (relay No. 10) from Power Distribution Center (PDC). PDC is located on left front fender apron. see scheme 20 Go to next step.
3. Connect a jumper wire between terminals "A" (Dark Blue wire) and "E" (Brown/White wire) on high low relay socket. If wiper motor operates in low speed mode, replace HI/LO wiper relay. If wiper motor does not operate in low speed mode, go to next step.
4. Leave jumper wire connected. Disconnect wiper motor connector. Connector is located on engine compartment firewall, just right of power brake booster. Go to next step.
5. Using scan tool in voltmeter mode, measure voltage at terminal No. 4 (Brown/White wire) on wiper motor connector. If voltage is 10 volts or less, repair open Brown/White wire. If voltage is more than 10 volts, replace wiper motor.
6. Stop wiper motor low speed actuation. Gain access to Body Control Module (BCM). BCM is located behind right kick panel. Leave BCM connectors connected. Move wiper switch to low. Go to next step.
7. Using scan tool in voltmeter mode, backprobe terminal No. 16 (Dark Green/Red wire) on BCM Bone connector. If voltage is more than 6 volts, replace BCM. If voltage is 6 volts or less, replace multifunction switch.

TEST 107A - WIPER MOTOR INTERMITTENT SPEED OPERATION

Note. Perform TEST 103A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

Turn ignition on. Move wiper switch through all 6 different delay (intermittent speed) levels. Using scan tool, read wiper switch status. If voltage is present at each position, replace BCM. If voltage is not present at each position, replace multifunction switch.

TEST 109A - WASHER PUMP OPERATION

Note. Perform TEST 103A before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring schematics, see WIRING DIAGRAMS in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE after each repair.

1. Ensure washer fluid reservoir is full. Check windshield washer pump operation. If washer pump does not operate, go to step 5). If washer pump operates and wipers operate, system is operating properly. If washer pump operates, but wipers do not operate, go to next step.
2. Using scan tool, read washer switch status while pushing wash button. If scan tool displays WASHER SW: CLOSED, replace Body Control Module (BCM). If scan tool does not display WASHER SW: CLOSED, go to next step.
3. Turn ignition off. Disconnect BCM Bone connector and multifunction switch connector. BCM is located behind right kick panel. Multifunction switch connector is located on upper part of steering column, behind trim cover. Go to next step.
4. Using an external ohmmeter, measure resistance between terminal No. 10 (Brown wire) on BCM Bone connector and terminal No. 2 (Brown wire) on multifunction switch connector. If resistance is 5 ohms or greater, repair open Brown wire. If resistance is less than 5 ohms, replace BCM.
5. Ensure washer fluid lines and nozzles are not damaged or restricted. Repair as necessary. If lines and nozzles are okay, go to next step.
6. Disconnect windshield washer pump connector. Using scan tool in ohmmeter mode, measure resistance at terminal No. 2 (Black wire) on windshield washer pump connector. If resistance is 5 ohms or greater, repair open Black wire. If resistance is less than 5 ohms, go to next step.
7. Push and hold windshield washer button on end of wiper/washer control. Using scan tool in voltmeter mode, measure voltage at terminal No. 1 (Brown wire) on windshield washer pump connector. If voltage is 10 volts or less, repair open Brown wire between wiper/washer switch and windshield washer pump connector. If voltage is more than 10 volts, replace windshield washer pump.