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Home >> Chevrolet >> 2013 >> Impala LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Door System, Mirror System & Window System) >> Diagnostic Information and Procedures >> DTC B3125 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the Lock relay in the BEC. Verify the DTC resets.
    • If the DTC does not reset, replace the relay.
  2. Disconnect the BEC connector C1. Verify the DTC resets.
    • If the DTC does not reset, replace the BEC.
  3. Test for a short to ground in the door lock relay control circuit.
    • If all circuits/connections test normal, replace the BCM.
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