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Lighting Systems Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC) located under left side of instrument panel. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on. Attempt to communicate with Body Control Module (BCM) and Powertrain Control Module (PCM). If scan tool communicates with BCM and PCM, go to next step. If scan tool does not communicate with BCM and PCM, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Display BCM and PCM DTCs on scan tool. If any DTC are set, go to next step. If no DTCs are set, courtesy light diagnosis is necessary. See INTERIOR LIGHTS article.
  4. Using scan tool, check for any DTCs that begin with "U" (communication DTCs) stored in BCM. If no communication DTCs exist in BCM or PCM, go to next step. If any communication DTCs exists, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  5. If scan tool displays DTC B0605, go to DTC B0605: BCM INTERNAL MEMORY MALFUNCTION  under DIAGNOSTIC TESTS. If DTC B0605 is not set, go to next step.
  6. If scan tool displays DTC P0562 or P0563, see GENERATORS & REGULATORS - CORVETTE article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTC P0562 or P0563, diagnose system by symptom.
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