Lighting System Diagnostic System Check
- Install scan tool. If scan tool works, go to next step. If scan tool does not work, go to SCAN TOOL INOPERATIVE .
- Turn ignition on. Attempt to communicate with BCM. If BCM communicates with scan tool, go to next step. If BCM does not communicate with scan tool, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
- Check BCM DTCs. If any BCM DTCs exist, go to DIAGNOSTIC TESTS and perform appropriate diagnostic test procedure. If no BCM DTCs exist, go to INTERMITTENTS .