Diagnostic Aids

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The radio and window RAP function are separate RAP functions controlled by serial data and the specific module. These functions are not effected by the BCM RAP relay circuits.
A short to ground or open/high resistance in the RAP relay switched voltage circuits will cause only part of the RAP functions to be inoperative. Diagnose these symptoms within the respective system sections.
A short to voltage on the RAP relay control or switched voltage circuits would cause the relay controlled RAP functions to remain on past the designated time.
If all relay controlled RAP functions are inoperative (radio RAP functions) and DTC B1475 is not set, test or replace the RAP relay.
If all RAP functions are inoperative (including radio) and DTC B1475 is not set, replace the BCM.