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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 991 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Power Door Locks Inoperative - Front (w/AN3) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Front Door Lock Circuit Test

  1. Disconnect the harness connector at the affected door latch, and connect a test lamp between the listed lock actuator control circuit terminals.
    • Driver terminal 5 to 6
    • Passenger terminal 2 to 3
  2. Verify that the test lamp illuminates while the lock switch is operated to lock and unlock.
    • If the test lamp does not illuminate, test the lock actuator control circuits for an open/high resistance or a short to ground. If the circuit tests normal replace the affected door latch.
  3. If the circuits test normal replace the affected door lock and side window switch.
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