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Home >> Pontiac >> 2002 >> Aztek AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0724: Brake Switch Circuit - High Input >> Diagnostic Procedure
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Diagnostic Procedure

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: Before clearing the DTCs, use the scan tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the PCM.
  2. Install a scan tool. Turn ON the ignition with the engine OFF. Record the Failure Records. Clear the DTCs. With the scan tool, observe the TCC Brake Switch parameter. Apply the brake pedal. Does the scan tool display Open? If yes, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
    3. CAUTION: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. See appropriate AIR BAG RESTRAINT SYSTEMS article in ACCESSORIES & EQUIPMENT. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.
  3. Turn OFF the ignition. Disconnect the TCC brake switch 4-way connector C2. Turn ON the ignition with the engine OFF. With a scan tool, observe the TCC Brake Switch parameter. Does the scan tool display Open? If yes, go to step  5. If no, go to next step.
  4. Test the signal circuit (CKT 420) of the TCC brake switch for a short to power between the PCM and the TCC brake switch. Did you find and correct the condition? If yes, go to step  7. If no, go to step  6.
  5. Replace the TCC brake switch. After repairs, go to step  7.
  6. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  7. Perform the following procedure in order to verify the repair:
    • Select DTC.
    • Select Clear Info.
    • Turn ON the ignition with the engine OFF.
    • Apply the brake pedal.
    • The TCC brake switch must be Open for more than 2 seconds.
    • Select Specific DTC.
    • Enter DTC P0724.

    Has the test run and passed? If yes, system is okay. If no, go to step  1.

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