Diagnostic Aids

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.
If a single switch function is inoperative, test the suspect switch. Refer to Component Testing .
A poor connection at the right switch could cause the left switch to malfunction or be inoperative.