C0161: Abs/TCS Brake Switch Circuit Malfunction: Notes

Fig 1: ABS/TCS Brake Switch Circuit Malfunction Schematic

Courtesy of GENERAL MOTORS CORP.

The normally-open stop lamp switch supplies battery voltage to the ECM when the brake pedal is pressed. The ECM sends a brake pedal applied serial data message to the Electronic Brake and Traction Control Module (EBTCM) and to the Transmission Control Module (TCM).