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*Brake Lamp Switch Failure: Testing

  1. With the DRBIII® in Inputs/Outputs, read the brake lamp switch state. Press and release the brake pedal. Does the DRBIII® 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. See ABS VERIFICATION TEST VER-1 .
  3. Disconnect the brake lamp switch harness connector. Connect a jumper wire between the brake lamp switch B+ and brake lamp switch output circuits. With the DRBIII® in Inputs/Outputs, read the brake lamp switch state. Does the DRBIII® display PRESSED? Yes, replace the brake lamp switch. See DISC 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. See ABS VERIFICATION TEST VER-1 . No, replace the Controller Anti-Lock Brake. Perform ABS VERIFICATION TEST VER-1 .
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