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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1303 (Door Lock System & Door Handles) >> Diagnostic Information and Procedures >> Power Door Lock Key Cylinder Switches Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 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 less than 1 ohm between the low reference circuit terminal 8 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the DDM
  3. Ignition ON, verify the scan tool Door Key Cyl Unlock Switch parameter is Idle.
    • If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuits test normal, replace the DDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 9 and ground, verify the scan tool Door Key Cyl Unlock Switch parameter is Unlock.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the DDM.
  5. If all circuits tests normal, test or replace the driver door latch.
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