Circuit/System Testing
IMPORTANT:
Fix any Brake System related DTCs or symptoms before using this diagnostic.
- Ignition ON, perform the brake pedal position (BPP) sensor calibration procedure and verify the BPP is calibrated properly. Refer to Brake Pedal Position Sensor Calibration
.
- If the BPP will not calibrate properly, replace the BPP.
- Ignition ON, observe the BPP Circuit Signal parameter in the ECM while depressing the brake pedal.
- If the parameter reads Applied, test the stop lamp switch signal circuit for an open/high resistance, a short to ground or a short to voltage. If the circuit tests normal, replace the ECM.
- If the parameter reads Released, refer to Stop Lamps Malfunction .