Retrieving & Clearing Diagnostic Trouble Codes

NOTE: Before proceeding with diagnosis, certain precautions must be followed. See SERVICE PRECAUTIONS .

Diagnostic procedures are designed to detect system faults as quickly as possible. Computer system diagnostic fault messages are accessed through Data Link Connector (DLC). See Figure . Chrysler's Diagnostic Readout Box (DRBIII(R)) scan tool or generic scan tool, is used to access information from DLC.

Connect scan tool to Data Link Connector (DLC). DLC is a 16-pin connector located on left side of steering column, above brake pedal. Turn ignition on. If scan tool display is not blank, go to next step. If scan tool display is blank, check connections, scan tool cable and power at DLC terminal No. 16 (Pink/White wire). Try scan tool on another vehicle.
Using scan tool, check communication with air bag control module, instrument cluster, powertrain control module and sentry key immobilizer module. If scan tool can communicate with all modules, go to next step. If scan tool displays NO RESPONSE, perform appropriate test under SYSTEM TESTS. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table.
Using scan tool, select READ DTCs. If any fault messages are displayed, perform appropriate test under SYSTEM TESTS. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. If no DTCs exist, but a symptom is present, repair by symptom. See SYMPTOM IDENTIFICATION table. After repairs, ensure problem(s) or failure(s) have been corrected by performing appropriate verification test under VERIFICATION TESTS.

DIAGNOSTIC TROUBLE CODE IDENTIFICATION

Affected System

Scan Tool Display

Air Bag

⁽¹⁾

Instrument Cluster

ACM MESSAGE NOT RECEIVED BY MIC

.....

AIR BAG LIGHT CIRCUIT OPEN

.....

AIR BAG LIGHT CIRCUIT SHORT

.....

CHECKSUM FAILURE

.....

PANEL DIMMER OPEN

.....

PCM MESSAGE NOT RECEIVED BY MIC

.....

SKIM MESSAGE NOT RECEIVED BY MIC

Vehicle Theft Security Systems

.....

.....

.....

.....

.....

.....

STACK OVERFLOW FAILURE

.....

PCM STATUS FAILURE

.....

SERIAL LINK EXTERNAL FAULT

.....

ROLLING CODE FAILURE

.....

VIN MISMATCH

.....

TRANSPONDER CYCLIC REDUNDANCY CHECK (CRC) FAILURE

.....

TRANSPONDER COMMUNICATION FAILURE

.....

TRANSPONDER ID MISMATCH

....

TRANSPONDER RESPONSE MISMATCH

⁽¹⁾	For air bag system diagnostic trouble codes and testing procedures, see appropriate AIR BAG RESTRAINTS - JEEP WRANGLER article in RESTRAINTS.

SYMPTOM IDENTIFICATION

Affected System	Problem
Chime	CHIME INOPERATIVE AT ALL TIMES
.....	CHIME INOPERATIVE WITH DRIVER'S SEAT BELT UNFASTENED
.....	CHIME INOPERATIVE WITH EXTERIOR LIGHTS ON & DRIVER'S DOOR OPEN
.....	CHIME INOPERATIVE WITH KEY IN IGNITION, DRIVER'S DOOR OPEN
.....	CHIME SOUNDS WITH DRIVER'S SEAT BELT FASTENED
.....	CHIME SOUNDS WITH DRIVER'S DOOR OPEN, KEY REMOVED
Communications	BUS (+) &/OR BUS (-) OPEN OR NO RESPONSE FROM INSTRUMENT CLUSTER
.....	BUS (+) &/OR BUS (-) OPEN OR NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE
.....	NO RESPONSE FROM AIR BAG CONTROL MODULE
.....	NO RESPONSE FROM CONTROLLER ANTI-LOCK BRAKE
.....	NO RESPONSE FROM POWERTRAIN CONTROL MODULE (PCI BUS)
.....	NO RESPONSE FROM POWERTRAIN CONTROL MODULE (SCI ONLY)
.....	PCI BUS COMMUNICATION FAILURE
Electrically Heated Systems	REAR WINDOW DEFOGGER RELAY OPEN
.....	REAR WINDOW DEFOGGER RELAY SHORT TO VOLTAGE
.....	REAR WINDOW DEFOGGER SWITCH INDICATOR INOPERATIVE
.....	REAR WINDOW DEFOGGER GRID INOPERATIVE
Instrument Cluster	4WD INDICATOR INOPERATIVE
.....	ABS INDICATOR INOPERATIVE
.....	AIR BAG INDICATOR INOPERATIVE
.....	ALL GAUGES INOPERATIVE
.....	ANY PCI BUS INDICATOR INOPERATIVE
.....	BRAKE WARNING INDICATOR ALWAYS ON
.....	BRAKE WARNING INDICATOR INOPERATIVE
.....	FOGLIGHT INDICATOR INOPERATIVE
.....	HIGH BEAM INDICATOR INOPERATIVE
.....	NO BUS IN VF DISPLAY
.....	NO FUSE IN VF DISPLAY
.....	ONE GAUGE INOPERATIVE
......	PANEL DIMMING INOPERATIVE
.....	SEAT BELT INDICATOR NOT OPERATING PROPERLY
.....	VF DISPLAY INOPERATIVE
.....	VF Odometer Inoperative With Door Open
Interior Lighting	COURTESY LIGHTS INOPERATIVE - ALL LIGHTS
.....	COURTESY LIGHTS ON AT ALL TIMES
.....	ILLUMINATED ENTRY INOPERATIVE