Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Headlights Schematics | |||
1 | Did you perform the Lighting Diagnostic System Check? | Go to Step 2 | |
2 | Verify the fault is present. Does the system operate normally? | Go to Testing for Electrical Intermittents in Wiring Systems | Go to Step 3 |
3 |
Do the headlamps come on? | Go to Step 4 | |
4 | With the scan tool, read the flash to pass switch status as you move the switch. Does the scan tool display the switch status change? | Go to Step 10 | Go to Step 5 |
5 | Connect a test lamp (back probe) between the flash to pass battery feed circuit at the headlamp dimmer switch connector C201C and a good ground. Does the test lamp illuminate? | Go to Step 6 | Go to Step 7 |
6 |
Does the test lamp illuminate? | Go to Step 8 | Go to Step 9 |
7 | Repair the flash to pass battery feed circuit open between the engine wiring harness junction block and the switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 11 | -- |
8 | Repair the open in the flash to pass signal circuit between the switch and the BCM. Refer to Wiring Repairs in Wiring Systems. If no open is found, replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the repair? | Go to Step 11 | -- |
9 | Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in steering wheel and column - tilt. Did you complete the replacement? | Go to Step 11 | -- |
10 | Replace BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 11 | -- |
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
