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*Brake Lamp Switch Failure: Testing

  1. With the DRBIII(R) in Inputs/Outputs, read the brake lamp switch state. Press and release the brake pedal. Does the DRBIII(R) display PRESSED and RELEASED? Yes: The brake lamp switch is OK. Perform ABS VERIFICATION TEST VER-1  . No: Go to next step.
  2. Disconnect the brake lamp switch harness connector. Using a 12-volt test light connected to ground, check the brake lamp switch fused B+ circuit. See WIRING DIAGRAM  . Does the test light illuminate brightly? Yes: Go to next step. No: Repair the brake lamp switch fused B+ circuit for an open. Perform ABS VERIFICATION TEST VER-1  .
  3. Disconnect the brake lamp switch harness connector. Connect a jumper wire between the brake lamp switch B+ and output circuits. With the DRBIII(R) in Inputs/Outputs, read the brake lamp switch state. Does the DRBIII(R) display PRESSED? Yes: Replace and adjust the brake lamp switch. See DISC & DRUM article. Perform ABS VERIFICATION TEST VER-1  . No: Go to next step.
  4. Disconnect the CAB harness connector. Disconnect the brake lamp switch harness connector. Check the brake lamp switch output circuit for a short to voltage and for an open. Is the brake lamp switch output circuit shorted or open? Yes: Repair the brake lamp switch output circuit for a short to voltage or an open. Perform ABS VERIFICATION TEST VER-1  . No: Replace the Controller Anti-Lock Brake. See CONTROLLER ANTI-LOCK BRAKE (CAB)  . Perform ABS VERIFICATION TEST VER-1  .
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