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Diagnostic Procedure

  1. Install a scan tool. Does the scan tool power up? If so, go to next step. If not, diagnose scan tool concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the Dash Integration Module (DIM), Powertrain Control Module (PCM) and the Rear Integration Module (RIM). Does the scan tool communicate with the DIM, the PCM and the RIM? If so, go to next step. If not, diagnose body control system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Select the display DTCs function on the scan tool for the DIM, the PCM and the RIM. Does the scan tool display any DTCs for the DIM, the PCM or the RIM? If so, go to next step. If not, attempt diagnosis by symptom. See SYMPTOM TESTS  .
  4. Does the scan tool display any DTCs which begin with a "U"? If so, diagnose body control system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If not, go to next step.
  5. Does the scan tool display DTC B1000, B1004, B1007 or B1009? If so, diagnose body control system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If not, go to next step.
  6. Does the scan tool display DTC B1327? If so, diagnose charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If not, attempt diagnosis by symptom. See SYMPTOM TESTS  .
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