Circuit/System Verification

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

Ignition ON, verify that DTC C0277 or C029C is not set.
- If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the stop lamps while applying and releasing the brake pedal. Verify the stop lamps operate properly.
- If the stop lamps do not operate properly, refer to Symptoms - Lighting .