Circuit/System Testing

NOTE:

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

Ignition ON.
Verify that DTC C0131 4B is not set.
- If DTC C0131 4B is set
  Refer to Brake Pressure Modulator Valve Pressure Sensor Calibration .
- If DTC C0131 4B is not set
Replace the brake pressure modulator valve assembly and verify the DTC does not reset.
- If DTC resets
  Replace the K17 Electronic Brake Control Module.
- If DTC does not reset
All OK.