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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 >> DTC B3135 >> 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.
  1. Disconnect the IP fuse block and connect a test lamp from battery voltage to the door unlock control circuit terminal A2 X3.
  2. Verify that the test lamp does not illuminate.
    • If the test lamp illuminates test the door lock control circuit for a short to ground. If the circuit tests normal replace the BCM.
  3. If the circuits test normal replace the IP fuse block.
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