Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test Cw-1: Ebb Brake Pedal Switch Faults: Notes
Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.
Normal Operation and Fault Conditions
The brake pedal switch is an internal component of the EBB unit and cannot be serviced separately.
When the brake pedal is pressed, the ABS module sends a signal to the PCM along 2 hardwired circuits, the ABS module also sends out brake pedal position and pressure messages on the CAN. The ABS module monitors both brake pedal output circuits, if a circuit fault is detected such as a short to ground or an open circuit, a DTC is set.
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS C0040:01 | Brake Pedal Switch "A": General Electrical Failure | When the ABS module detects the brakelamp output signal is shorted to ground, this DTC is set. |
| ABS C0040:04 | Brake Pedal Switch "A": System Internal Failures | When the ABS module detects the brakelamp output signal is shorted to voltage, this DTC is set. |
| ABS C0041:01 | Brake Pedal Switch "B": General Electrical Failure | When the ABS module detects the brakelamp output signal is shorted to ground, this DTC is set. |
| ABS C0041:04 | Brake Pedal Switch "B": System Internal Failures | When the brake pedal is not being pressed, the ABS module detects greater than 1.95 volts on the BPS circuit. |
| ABS C0041:14 | Brake Pedal Switch "B": Circuit Short To Ground Or Open | When the ABS module detects the brakelamp output signal is shorted to voltage, this DTC is set. |
| ABS C0041:4B | Brake Pedal Switch "B": Over Temperature | Sets when the ABS module has calculated a possible over-termperature condition in the EBB unit. |
Possible Sources
- Wiring, terminals or connectors
- EBB unit
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.