Circuit Description
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The ignition 1 voltage circuit supplies 12 volts to the traction control switch. The EBCM turns OFF the traction off indicator by applying ground to the service traction control signal circuit.