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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1129 (Theft Deterrent System) >> Diagnostic Information and Procedures >> Content Theft Deterrent (CTD) Does Not Disarm with Key Lock >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the door latch assembly.
  2. Ignition OFF, test for less than 10 ohms of resistance between the ground circuit terminal 8 (LHD) or 3 (RHD) 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 Key Cylinder Lock/Unlock Switch parameter is Idle.
    • If not the specified value, test the signal circuit terminal 9 (LHD) or 4 (RHD) for a short to ground. If the circuit tests normal, replace the DDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 9 (LHD) or 4 (RHD) and ground. Verify the scan tool Key Cylinder Lock/Unlock Switch parameter is Unlock.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.
  5. If all circuits test normal, test or replace the door latch assembly.
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