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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0719: TCC Brake Switch Circuit Low Input (Switch Stuck On) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Before clearing the DTCs, use the scan tool to record the failure records for reference. Using the CLEAR INFO function will erase the stored failure records from the PCM. Record the failure records. Clear the DTCs. With a scan tool, observe the TCC brake switch parameter. Does the scan tool display CLOSED? If so, see DIAGNOSTIC AIDS  . If not, go to next step.
    3. NOTE: The condition that affects this circuit may exist in other connecting branches of the circuit.
  3. Remove the fuse from the ignition "1" voltage circuit. Inspect the fuse for an open. Replace the fuse if necessary. Was the fuse open? If so, go to next step. If not, go to step  5 .
    4. NOTE: The condition that affects this circuit may exist in other connecting branches of the circuit.
  4. Test the ignition "1" voltage circuit (CKT 339) of the TCC brake switch for a short to ground between the fuse block and the brake switch. Did you find and correct the condition? If so, go to step  10 .
  5. Disconnect the TCC brake switch 4-way connector. Connect a fused jumper wire from terminal "C" to terminal "D" of the TCC brake switch connector. Turn ignition on, engine off. With a scan tool, observe the TCC brake switch parameter. Does the scan tool display CLOSED? If so, go to step  8 . If not, go to next step.
  6. Test the ignition "1" voltage circuit (CKT 339) of the TCC brake switch for an open between the fuse block and the brake switch. Did you find and correct the condition? If so, go to step  10 . If not, go to next step.
  7. Test the signal circuit (CKT 420) of the TCC brake switch for an open between the PCM and the brake switch. Did you find and correct the condition? If so, go to step  10 . If not, go to step  9 .
  8. Replace the TCC brake switch (stoplamp switch). See STOPLAMP SWITCH  under REMOVAL & INSTALLATION. Did you complete the repair? If so, go to step  10 .
  9. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the repair? If so, go to next step.
  10. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • Turn ignition on, engine off.
    • The TCC brake switch must be closed (pedal released) for more than 2 seconds.
    • Select SPECIFIC DTC.
    • Enter DTC P0719.

    Has the test run and passed? If so, system is okay. If not, go to Step  1 .

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