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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1557 (Door Lock System & Door Handles) >> Diagnostic Information and Procedures >> Power Door Lock Key Cylinder Switches Inoperative >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the driver door latch.
  2. Test for infinite resistance between the signal terminal 9 and the low reference terminal 8 with the switch in the open position.
    • If not the specified value, replace the driver door latch.
  3. Test for less than 2 ohms between the signal terminal 9 and the low reference terminal 8 with the switch in the Unlock position.
    • If greater than the specified range, replace the driver door latch.
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