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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 872 (Door Lock Systems & Door Handles) >> Diagnostic Information & Procedures >> DTC B3135 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet 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 in connector C3.
  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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