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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1557 (Door Lock System & Door Handles) >> Diagnostic Information and Procedures >> DTC B3125, B3130, or B3135 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X7 harness connector at the BCM.
  2. Ignition ON, test for greater than 9 volts between the control circuit terminal listed below and ground.
    • Terminal 6
    • Terminal 9
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the I/P fuse block
  3. Connect a 15A fused jumper wire between the control circuit terminal 6 and ground. Verify the driver door latch performs the UNLOCK function.
    • If the driver door latch does not perform as specified, test the control for a short to voltage. If the circuit tests normal, replace the I/P fuse block.
  4. Connect a 15A fused jumper wire between the control circuit terminal 9 and ground. Verify the passenger door latches perform the UNLOCK function.
    • If the passenger door latches do not perform as specified, test the control for a short to voltage. If the circuit tests normal, replace the I/P fuse block.
  5. Verify that a test lamp illuminates between the control circuit terminal 7 and B+.
    • If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the I/P fuse block.
  6. Connect a 15A fused jumper wire between the control circuit terminal 7 and B+. Verify the door latches perform the LOCK function.
    • If the door latches do not perform as specified, test the control for a short to ground. If the circuit tests normal, replace the I/P fuse block
  7. If all circuits test normal, replace the BCM.
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