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DTC C0281: Stoplight Switch Circuit

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, observe brake switch status parameter in 4WAL 3-sensor data list. If scan tool displays OFF, go to next step. If scan tool does not display OFF, go to step  4.
  3. Apply brake pedal. Using scan tool, observe brake switch status parameter. If brake switch status parameter changes state, problem is intermittent. If brake switch status parameter does not change status, go to next step.
  4. Turn ignition off. Disconnect stoplight switch. Turn ignition on, with engine off . Using scan tool, observe brake switch status parameter. If scan tool displays OFF, go to step  7. If scan tool does not display OFF, go to next step.
  5. Check EBCM brake switch input circuit for short to voltage. Repair as necessary. After repairs, go to step  10. If circuit is okay, go to next step.
  6. Check for poor connections at EBCM harness connector. Repair as necessary. After repairs, go to step  10. If connections are okay, go to step  8.
  7. Check for poor connections at stoplight switch harness connector. Repair as necessary. After repairs, go to step 10. If connections are okay, go to step  9.
  8. Replace EBCM. After replacing EBCM, go to step  10.
  9. Replace stoplight switch. After replacing switch, go to next step.
  10. Using scan tool, clear DTCs. Recheck for DTCs. If DTC resets, go to step  2. If DTC does not reset, system is okay.
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