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Home >> Buick >> 2007 >> Rainier 5.3 M, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 414 (Cruise Control System) >> Diagnostic Information & Procedures >> DTC P1574 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, verify the TCC/Cruise Brake Pedal parameter displays Released.
    • If the parameter reads Applied, test the TCC Brake Switch/Cruise Control Release Signal circuit for a short to voltage. If the circuit tests normal, test or replace the stop lamp switch.
  2. Disconnect the stop lamp switch.
  3. Ignition ON, test for B+ at terminal D of the stop lamp switch harness.
    • If less than the specified value, test the ignition voltage supply circuit for an open/high resistance or short to ground.
  4. Reconnect the stop lamp switch and apply the brake pedal. Verify the TCC/Cruise Brake Pedal parameter displays Applied.
    • If the parameter reads Released, test the TCC Brake Switch/Cruise Control Release Signal circuit for an open/high resistance or short to ground. If the circuit tests normal, test or replace the stop lamp switch.
  5. If all circuit and component tests are normal, replace the ECM.
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