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.

Window (with RPO AN3) and radio RAP functions are separate RAP functions controlled by serial data messages and the specific module. These functions are not effected by the BCM internal RAP relay circuit.
Window RAP (without AN3) function is controlled by the BCM internal RAP relay.