Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Verify that the ground connection for the STRTR relay ground circuit is clean and tight.
Inspect the terminals for the STRTR relay in the underhood fuse block for poor connections.