Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Test the fog lamp switch for sticking in the ON position.
Perform a visual inspection for loose or poor connections at all related components. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.