Code A041: Brake Switch Circuit Open
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1991 Pontiac Grand Prix, 1991 Oldsmobile Cutlass Supreme, 1991 Buick Regal, 1990 Pontiac Grand Prix, and 1990 Oldsmobile Cutlass Supreme. However, it is still accessible from the selected car via links, so may be relevant.
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).
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- 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).
- Observe state of brake switch. If brake switch is closed, anti-lock brake controller is sensing correct input.
- 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.
NOTE:
INTERMITTENTS is located under DIAGNOSIS & TESTING.