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Diagnostic System Check

  1. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article.
  2. Turn ignition on, engine off. Attempt to establish communications with Body Control Module (BCM) and Memory Mirror Module. If scan tool communicates with BCM and Memory Mirror Module, go to step  4 . If scan tool does not communicate with BCM and Memory Mirror Module, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
  3. Access CLASS 2 power mode in diagnostic circuit check on scan tool. Rotate ignition switch through all positions while observing IGNITION SWITCH POWER mode parameter. If IGNITION SWITCH parameter reading matches ignition switch position for all switch positions, go to next step. If IGNITION SWITCH parameter does not match ignition switch position, see appropriate BODY CONTROL MODULES article.
  4. Select display DTCs function on scan tool for BCM and Memory Mirror Module. If scan tool displays any DTCs, go to next step. If no DTCs are present, see SYMPTOM INDEX  under SYSTEM TESTS.
  5. If scan tool displays any DTCs which begin with a "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article. If scan tool does not display any codes which begin with a "U", go to next step.
  6. If scan tool displays DTC B1000 or DTC B1005, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
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