Circuit 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 steering wheel control are simple momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The truck body computer (TBC) determines which switch has been pressed by the voltage drop across the corresponding resistance value.