Fog Lamps Always On
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.
Fog Lamps Always On
| 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 front fog lamps are always ON. Do the front fog lamps operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Remove the FOG LAMP fuse in the underhood fuse block. Do the front fog lamps turn OFF? |
Go to Step 4 | Go to Step 7 |
| 4 |
|
Go to Step 5 | Go to Step 9 |
| 5 | Test the front fog lamp relay control circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 10 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 10 | Go to Step 8 |
| 7 | Repair the short to voltage in the front fog lamp supply voltage circuit. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 10 | - |
| 8 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 10 | - |
| 9 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement
. Did you complete the repair? |
Go to Step 10 | - |
| 10 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |