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Home >> Cadillac >> 2002 >> DeVille Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Interlock Systems >> Self-Diagnostic System >> Diagnostic System Check >> Diagnostic Procedure

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 DIM, PCM and the 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.
    NOTE: If vehicle is a 2001 model year, go to step  4 . If vehicle is a 2002 model year, continue with step  3 .
    3. NOTE: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  3. Access the Ignition Switch parameter in the body control module (BCM) inputs data display list. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? If so, go to next step. If not, check for power mode mismatch concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. 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, PCM, or RIM? If so, go to next step. If not, attempt diagnosis by symptom. See SYMPTOM TESTS  .
  5. 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.
  6. 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.
  7. 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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