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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 >> DTC B2976 >> 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 harness connector at the driver door lock.
  2. Ignition ON, verify the scan tool Driver Door Ajar Sw parameter is Door Closed.
    • If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
      • Signal circuit terminal 4 (without RPO AU3)
      • Signal circuit terminal 6 (with RPO AU3)
  3. If all circuits test normal, test or replace driver door lock.
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