Fog Lamps Always On
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fog Lamps Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Fog Lights Schematics | |||
| 1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 | Verify that the front fog lamps are always on. Do the front fog lamps operate normally? |
Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems | Go to Step 3 |
| 3 | Remove the front fog lamp relay. Do the front fog lamps turn OFF? |
Go to Step 4 | Go to Step 6 |
| 4 |
|
Go to Step 5 | Go to Step 8 |
| 5 | Inspect for poor connections at the harness connector of the Body Control Module (BCM). Refer to CIRCUIT TESTING
and WIRING REPAIRS
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 7 |
| 6 | Repair the short to voltage in the front fog lamp supply voltage circuit. Refer to WIRING REPAIRS
in Wiring Systems. Did you complete the repair? |
Go to Step 9 | - |
| 7 |
IMPORTANT:
Perform the setup procedure for the BCM. Replace the body control module (BCM). Refer to BODY CONTROL MODULE REPLACEMENT
in Body Control System.Did you complete the replacement? |
Go to Step 9 | - |
| 8 | Replace the front fog lamp relay. Refer to Fog Lamp Relay Replacement (RPO T96) Fog Lamp Relay Replacement (RPO T79) . Did you complete the repair? |
Go to Step 9 | - |
| 9 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |