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DTC P0703: Brake Switch #2 Circuit: Testing

NOTE: Brakelight switch may also be referred to as brake switch, brake lamp switch or stoplamp switch.
  1. Ensure the brake lamp switch is adjusted properly before continuing. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the brake lamp switch harness connector. Using a 12-volt test light connected to ground, check the (F32) fused B+ circuit in the brake lamp switch harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the (F32) fused B+ circuit. Inspect the related fuse and repair as necessary.
  3. Turn the ignition off. Disconnect the brake lamp switch harness connector. Disconnect the PCM harness connectors. Turn the ignition on. Measure the voltage of the (K29) brake switch signal circuit in the brake lamp switch harness connector. Is the voltage above 1.0 volts? If yes, repair the short to voltage in the (K29) brake switch signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the brake lamp switch harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K29) brake switch signal circuit at the brake lamp switch harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (K29) brake switch signal circuit. If no, go to next step.
    5. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the brake lamp switch harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K29) brake switch signal circuit from the brake lamp switch harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K29) brake switch signal circuit.
  6. Turn the ignition off. Disconnect the brake lamp switch harness connector. Measure the resistance between ground and the (Z1) ground circuit at the brake lamp switch harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (Z1) ground circuit.
  7. Turn the ignition off. Disconnect the brake lamp switch harness connector. Measure the resistance between the ground circuit terminal and the brake switch sense terminal in the brake lamp switch. Apply and release the brake pedal while monitoring the ohmmeter. Does the resistance change from below 5.0 ohms to open circuit? If yes, go to next step. If no, replace the brake lamp switch.
  8. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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