Code A041: Brake Switch Circuit Open

When the brake pedal is pressed, the anti-lock brake controller senses voltage at the brake apply input. If voltage is absent, anti-lock brake controller will ground through circuit No. 20 or the brakelights. Code A041 will also set if hazard lights are turned on and stoplight is non-functional. To set Code A041, the following conditions must occur.

• Battery voltage is not sensed at brake apply input (brake switch open).
• Anti-lock brake controller does not sense ground through circuit No. 20 (Brake-Apply Input).

1. Isolates open to circuit No. 20 between brake switch and BRAKE warning indicator light (light off), or circuit No. 20 between brake switch and anti-lock brake controller (light on).
2. Observe state of brake switch. If brake switch is closed, anti-lock brake controller is sensing correct input.
3. Isolate open to circuit No. 20 between brake switch and anti-lock brake controller if zero volt is measured. If circuit No. 20 is okay, replace anti-lock brake controller.

Fig 1: Code A041 Schematic, Brake Switch Circuit Open

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code A041 Flow Chart, Brake Switch Circuit Open

Courtesy of GENERAL MOTORS CORP.

Fig 3: Code A041 Flow Chart, Brake Switch Circuit Open