Body Control Modules: Diagnosis Jeep Cherokee III

Programming Blank Sentry Keys Using Scan Tool

1. Once key blank is cut, insert key into ignition switch. Turn ignition switch to ON position.
2. Using scan tool, select THEFT ALARM, then SKIM. Select MISCELLANEOUS.
3. Using scan tool, select PROGRAM NEW KEY.
4. Enter 4-digit Personal Identification Number (PIN) code. This number can be obtained from vehicle invoice or calling Chrysler customer center.
5. When programming is completed, Sentry Key Immobilizer Module (SKIM) will exit SECURED ACCESS mode and display status of key. One of 5 different status messages may be displayed. PROGRAMMING SUCCESSFUL This will be displayed if SKIM smart key programming succeeds. LEARNED KEY IN IGNITION This will be displayed if key in ignition has already been programmed into vehicle's SKIM. 8 KEYS ALREADY LEARNED, PROGRAMMING NOT DONE This will be displayed if 8 keys have already been programmed into SKIM. If a new key needs to be added due to a lost or defective key, ERASE ALL KEYS function has to be performed. Original 7 keys plus additional new key may then be reprogrammed into SKIM. PROGRAMMING NOT ATTEMPTED This will be displayed after an ERASE ALL KEYS function is executed. PROGRAMING KEY FAILED This will be displayed if transponder is faulty, or transponder is programmed for another vehicle.
6. To program additional keys, turn ignition switch to OFF position. Remove current programmed key, then go to step 1 .

TROUBLE SHOOTING

Before proceeding with diagnosis, the following precautions MUST be followed

1. Vehicle must have a fully charged battery and functional charging system.
2. When testing voltage or continuity at any control module, use terminal side and not wire end. DO NOT probe a wire through insulation.
3. Only perform test steps indicated. It is not necessary to perform all steps in a test.
4. Turn ignition switch to OFF position before disconnecting or connecting components.
5. Use extreme care when connecting or disconnecting wiring during testing to prevent accidental grounding or shorting.
6. Unless instructed to do so in test steps, DO NOT use a test light in place of a DVOM.
7. Always disconnect scan tool after use.
8. Always disconnect scan tool before charging battery.
9. Always perform appropriate verification tests after repairs are made. See «VERIFICATION TESTS»(ref-91240-S26541222752001030600000) .

PRELIMINARY INSPECTION

Verify customer's concern by operating appropriate system. Check for blown fuses, damaged wiring or harness. Inspect for mechanical and/or electrical damage. If fault is found, repair as necessary. If no fault is found, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM .

SELF-DIAGNOSTIC SYSTEM

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

RETRIEVING & CLEARING DIAGNOSTIC TROUBLE CODES

Note. Before proceeding with diagnosis, certain precautions must be followed. See TROUBLE SHOOTING .

1. Connect scan tool to Data Link Connector (DLC). DLC is a 16-pin connector located on left side of steering column, above brake pedal. (Схема №1) Turn ignition switch to ON position. If scan tool display is not blank, go to next step. If scan tool display is blank, perform «SCAN TOOL BLANK SCREEN»(ref-91240-S06554007572001030600000) under COMMUNICATIONS under SYSTEM TESTS.
2. Using scan tool, select BODY SYSTEM, then BODY COMPUTER. Scan tool will perform a CCD bus test. If scan tool displays BUS OPERATIONAL, go to next step. If scan tool displays NO RESPONSE, perform appropriate test. See «SYMPTOM IDENTIFICATION»(ref-91240-S16870958032001030600000) table. If scan tool displays any other message, perform appropriate test under «COMMUNICATIONS»(ref-91240-S40423995972001030600000) under SYSTEM TESTS.
3. Using scan tool, select READ DTCs. If any fault messages are displayed, see «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table to identify which system is affected. If no fault messages are displayed, repair by symptom. See «SYMPTOM IDENTIFICATION»(ref-91240-S16870958032001030600000) table for list of identified systems. Fault messages or symptoms are diagnosed using a scan tool and/or DVOM. These problems may occur separately or in various combinations. When diagnosing a system with many apparent problems, a sequence of tests may be required. After repairs, ensure problem(s) or failure(s) have been corrected by performing appropriate verification test. See «VERIFICATION TESTS»(ref-91240-S26541222752001030600000).

DIAGNOSTIC TROUBLE CODE DEFINITIONS

SYMPTOM IDENTIFICATION

Scan Tool Blank Screen

Note. Low temperatures will affect visibility of display. Adjust contrast to compensate for condition.

1. Check continuity between ground and terminals No. 4 (Black wire) and No. 5 (Black/Tan wire) at Data Link Connector (DLC). (Схема №6) If continuity exists, go to next step. If continuity does not exist, repair open in appropriate wire.
2. Turn ignition switch to ON position. Measure voltage between ground and terminal No. 16 (Tan/Black wire) at DLC. If battery voltage does not exist, repair power distribution circuit as necessary. See DATA LINK CONNECTORS article in WIRING DIAGRAMS. If battery voltage exists, repair or replace scan tool or scan tool cable as necessary. Perform «BODY VERIFICATION TEST»(ref-91240-S24709081812001030600000) under VERIFICATION TESTS.

AIR BAG VERIFICATION TEST

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Connect scan tool to Data Link Connector (DLC). (Схема №1) Turn ignition switch to ON position. Using scan tool, erase all DTCs. Turn ignition switch to OFF position and wait 15 seconds.
2. Turn ignition switch to ON position and wait one minute. Read and record DTCs. If no DTCs are reset, repair is complete. If any DTCs reset, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM.

AW4 TRANS VERIFICATION TEST

Note. If replacing Powertrain Control Module (PCM), correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with a Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, perform appropriate diagnostic test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM. If all DTCs have been diagnosed and repaired, go to next step.
2. If repair procedure did not include replacing Powertrain Control Module (PCM), go to next step. If PCM has been replaced and has already been programmed, go to next step. If PCM has been replaced but has not been programmed, program PCM and clear DTCs. See «PROGRAMMING»(ref-91240-S01390139442001030600000) . After PCM is programmed, go to next step.
3. Using scan tool, clear PCM and Transmission Control Module (TCM) DTCs. Ensure transmission fluid is at proper level. Road test vehicle. Using scan tool, monitor engine RPM. Make 15-20 1st-2nd, 2nd-3rd and 3rd-4th upshifts. Perform shifts from a standing start to 45 MPH with a constant throttle opening of 20-25 degrees.
4. With vehicle speed less than 25 MPH, make 5-8 wide open throttle kickdowns to 1st gear. Allow at least 5 seconds each in 2nd and 3rd gear between each kickdown.
5. Using scan tool, monitor SIMILAR CONDITIONS and attempt to duplicate conditions that vehicle was operating at when DTC was set. If conditions can be duplicated, GOOD TRIP counter will change to one or more. If repaired DTC resets, proceed to appropriate DTC test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM. If conditions cannot be duplicated and GOOD TRIP counter changed to one or more, repair was successful and test is now complete.

BODY VERIFICATION TEST

Note. If 3 attempts are made to place Sentry Key Immobilizer Module (SKIM) in secured access mode using incorrect Personal Identification Number (PIN), secured access mode will be locked out for one hour. To exit lockout mode, turn ignition switch to ON position for one hour. Connect battery charger if necessary.

Note. Secured access mode is not required to check status of programmed sentry key. If Powertrain Control Module (PCM) is replaced, secret key data must be transferred from Sentry Key Immobilizer Module (SKIM) to PCM. SKIM will have to be placed in secured access mode.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If Sentry Key Immobilizer Module (SKIM) was replaced, go to step 3 . If Powertrain Control Module (PCM) was replaced, perform «POWERTRAIN VERIFICATION TEST VER-2»(ref-91240-S20021182262001030900000) . Once verification test has been performed, return to step 3 . If SKIM and/or PCM were not replaced, go to next step.
2. If Remote Keyless Entry (RKE) module was replaced, using scan tool, select THEFT ALARM, VTSS, MISCELLANEOUS and PROGRAM RKE. Program all transmitters for vehicle, see «REMOTE KEYLESS ENTRY (RKE)»(ref-91240-S20969660892001030600000) under PROGRAMMING. Proceed to step 8 .
3. Obtain vehicle Personal Identification Number (PIN) assigned to original SKIM. This number can be found on vehicle invoice or calling Chrysler customer center.
4. Using scan tool, select THEFT ALARM, SKIM MISCELLANEOUS and SKIM MODULE REPLACED. Enter SECURED ACCESS mode using unique 4 digit PIN.
5. Program country code into SKIM memory (U.S.). Program Vehicle Identification Number (VIN) into SKIM memory. Transfer vehicle unique secret key data from PCM. This process will require SKIM to be in SECURED ACCESS mode.
6. PIN must be entered into scan tool before SKIM will enter SECURED ACCESS mode. Once SECURED ACCESS mode is active, SKIM will remain in that mode for 60 seconds.
7. Program all sentry keys into SKIM memory. This requires that SKIM be in SECURED ACCESS mode. SKIM will immediately exit SECURED ACCESS mode after each sentry key is programmed.
8. Ensure all accessories are off and battery is fully charged. Turn ignition switch to ON position. Using scan tool, erase DTCs from all modules.
9. Start engine and let idle for 2 minutes. Operate malfunctioning system. Turn ignition switch to OFF position and wait 5 seconds. Turn ignition switch to ON position. Check for DTCs. If any DTCs exist, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM. If DTCs do not exist, repair is complete.

POWERTRAIN VERIFICATION TEST VER-1

Note. If Powertrain Control Module (PCM) has been replaced and correct Vehicle Identification Number (VIN) and mileage have not be entered into new PCM, Diagnostic Trouble Codes (DTC) will set in Anti-lock Brake System (ABS), Air Bag Control Module (ACM) and Sentry Key Immobilizer Module (SKIM). Secret key data must be updated prior to starting vehicle. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Check engine oil for fuel contamination. Change oil and filter if necessary.
2. Start engine and allow to run until operating temperature is reached. Using scan tool, ensure no DTCs have reset. If any DTCs reset, check for Technical Service Bulletins (TSB). If different DTCs set, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM. If DTCs do not exist, repair is complete. If no DTCs are set, repair is complete.

POWERTRAIN VERIFICATION TEST VER-2

Note. If replacing Powertrain Control Module (PCM), correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with a Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If test is being performed after performing a repair that did not involve a Diagnostic Trouble Code (DTC) test, go to next step. If test is being performed after performing a repair that involved a DTC test, go to step 3 .
2. Check if initial symptom still exists. If initial or another symptom exists, repair is not complete. Check for Technical Service Bulletins (TSB) that apply to symptom. If initial symptom no longer exists and no DTCs are present, test is complete.
3. If repair procedure did not include replacing PCM, go to next step. If PCM has been replaced and has already been programmed, go to next step. If PCM has been replaced but has not been programmed, program PCM and clear DTCs. See «PROGRAMMING»(ref-91240-S01390139442001030600000) . After PCM is programmed, go to next step.
4. Road test vehicle for at least 5 minutes. If repair involved A/C relay control circuit, ensure A/C is on during road test. Road test vehicle at a speed of at least 40 MPH at some point during road test. Stop vehicle. Turn engine off for at least 10 seconds. Start engine and continue road test. Ensure transmission shifts through all gears. After road test, turn engine off and go to next step.
5. Using scan tool, read DTCs. If original DTC did not return and there are no new DTCs, test is complete. If original DTC returns or another DTC is present, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM.

SKIS VERIFICATION TEST

Note. If 3 attempts are made to place Sentry Key Immobilizer Module (SKIM) in secured access mode using incorrect Personal Identification Number (PIN), secured access mode will be locked out for one hour. To exit lockout mode, turn ignition switch to ON position for one hour. Connect battery charger if necessary.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Obtain vehicle unique Personal Identification Number (PIN) assigned to Sentry Key Immobilizer Module (SKIM). This number can be obtained from vehicle invoice or calling Chrysler customer center.
2. Using scan tool, select THEFT ALARM, SKIM then MISCELLANEOUS. Select desired procedure and follow steps that will be displayed. If SKIM has been replaced, ensure all sentry keys are programmed to new SKIM. See «PROGRAMMING»(ref-91240-S01390139442001030600000) .
3. Using scan tool, display and erase all PCM and SKIM DTCs. Cycle ignition switch from OFF to ON positions 5 times, leaving ignition switch in ON position for a minimum of 90 seconds per cycle. Using scan tool, read and record SKIM DTCs. If original DTC did not return and there are no new DTCs, test is complete. If original DTC returns or another DTC is present, perform appropriate test in accordance with DTC retrieved. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91240-S30103003232001030600000) table under SELF-DIAGNOSTIC SYSTEM.