Circuit/System Verification

NOTE:

Diagnose all other brake light DTCs or Symptoms prior to performing this diagnostic procedure.

Verify DTC U0140, C0277 or C0890 is not set.
- If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Verify the brake pedal position sensor or the brake pedal is not binding causing residual brake pressure to be detected, while the brake lights operate properly.
- If a condition is found, repair or replace the applicable component.
Apply and release the brake pedal. Verify the brake lamps operate properly.
- If the brake lamps do not operate properly, refer to Symptoms - Lighting .
Ignition ON, observe the scan tool EBCM BPP Signal parameter while applying and releasing the brake pedal. The reading should change between Applied and Released.
- If the parameter does not change between applied and released, refer to Brake Pedal Position Sensor Calibration .
Refer to Diagnostic Aids.