Test Description
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
3. Determines if the Onstar® status LED has the necessary Green LED signal circuit voltage.
5. If the Green LED signal is shorted to voltage then the Onstar® three button assembly has been damaged and the Onstar® three button assembly must be replaced.