Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Transmission Range Switch Logic for valid combinations of switch signal circuits A, B, C and Parity. In the Transmission Range Switch Logic table, HI indicates an ignition voltage signal and LOW indicates a zero voltage signal.