For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Lighting System Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems
2 | Disconnect the headlamp/instrument panel (IP) lamp dimmer switch connector. Do the lamps turn off? | -- | Go to Step 3 | Go to Step 4
3 | Replace the headlamp/IP lamp dimmer switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Step 8 | --
4 | Disconnect the daytime running lamps (DRL) control module. Do the exterior lights turn off? | -- | Go to Daytime Running Lamps (DRL) Headlamps Inoperative | Go to Step 5
5 | Disconnect the theft deterrent relay. Do the exterior lights turn off? | -- | Go to Step 7 | Go to Step 6
6 | Repair a short to B+ in CKT 9. Is the repair complete? | -- | Go to Step 8 | --
7 | Refer to Diagnostic System Check - Theft Deterrent in Theft Deterrent. Is the repair complete? | -- | Go to Step 8 | --
8 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2