Diagnostic System Check - Lighting Systems. Buick GL7 (Export) 2000

For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Attempt to operate the vehicle power door locks. Are the power door locks operational? | Go to Step 2 | Go to Body Control Module Inoperative in Body Control Systems
2 | Check for body control module (BCM) DTCs. Refer to On-Board Diagnostic Features in Body Control Systems. Does the BCM sound and flash DTC 2? | Go to DTC 2 Battery Feed To Courtesy Lamps | Go to Step 3
3 | Does the BCM sound and flash DTC 3? | Go to DTC 3 Courtesy Lamps | Go to Step 4
4 | Does the BCM display or sound any other DTCs? | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control Systems | Go to Symptoms - Lighting Systems