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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 227 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P1574 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Fix any Brake System related DTCs or symptoms before using this diagnostic.
  1. Ignition ON, perform the brake pedal position (BPP) sensor calibration procedure and verify the BPP is calibrated properly. Refer to Brake Pedal Position Sensor Calibration .
    • If the BPP will not calibrate properly, replace the BPP.
  2. Ignition ON, apply the brake pedal and observe the Stoplamp Pedal Switch parameter.
    • If the parameter reads On or Applied, refer to Stop Lamps Always On . If the stop lamps operate normal, replace the ECM/PCM.
    • If the parameter reads Released, test the stop lamp switch signal circuit for an open/high resistance or short to ground. If circuit tests normal, replace the ECM/PCM.
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