Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the scan tool Rear Fog Lamp Switch parameter while pressing and releasing the rear fog lamp switch. The reading should change between Active and Inactive.
- If not the specified value, refer to the rear fog lamp switch circuit test .
- Ignition ON, command the Rear Fog Lamps ON and OFF with a scan tool. Verify the front fog lamp turns on and off.
- If the front fog lamp is always on or always off, refer to the fog lamp control circuit test .