Rear Fog Lamps Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Rear Fog Lamps Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Fog Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Verify that the rear fog lamp is inoperative. Does the rear fog lamp operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Inspect for an open rear fog lamp bulb filament or poor connections/corroded terminals at the lamp socket. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find a condition? |
Go to Step 8 | Go to Step 4 |
| 4 | Use the scan tool to monitor the rear fog lamp switch input in the auxiliary body control module (XBCM) data list while depressing the switch several times. Does the scan tool parameter change from Active to Inactive? |
Go to Step 6 | Go to Step 5 |
| 5 | Test for an open or high resistance in the rear fog lamp switch signal circuit and fog lamp switch ground circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 11 | Go to Step 10 |
| 6 | Test for an open or high resistance in the rear fog lamp supply voltage circuit and fog lamp ground circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you complete the repair? |
Go to Step 11 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the auxiliary body control module (XBCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 11 | Go to Step 9 |
| 8 | Clean the socket terminals and/or replace the rear fog lamp bulb. Refer to Rear Fog Lamp Bulb Replacement (Cadillac Export) . Did you complete the repair? |
Go to Step 11 | - |
| 9 | Replace the XBCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 11 | - |
| 10 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? |
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 |