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Home >> Chevrolet >> 2025 >> Traverse Z71 >> Repair and Diagnosis >> Electrical >> Body Electrical >> Power Outlets >> Diagnostic Information and Procedures >> DTC B1A4B >> Circuit/System Testing

Circuit/System Testing

WARNING:

To help avoid personal injury, always treat the accessory power receptacle, accessory DC/AC power inverter module, AC circuit wires, and connectors as if AC high-voltage is present.

  1. Ignition OFF. Disconnect the X1 connector at the T1 DC/AC Converter Control Module. Ignition ON.
  2. Verify a test lamp does not illuminate between control circuit terminal 1 and ground.
    • If test lamp does illuminate 
    1. Test for a short to voltage on circuit 4629.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Test for a short to voltage on circuit 4628.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    3. Replace the X50A Engine Wiring Harness Junction Block.
    • Go to next step: If the test lamp does not illuminate 
  3. Replace the T1 DC/AC Converter Control Module.
  4. Clear DTCs. Operate the vehicle under Conditions for Running the DTC.
  5. Verify DTC B1A4B does not reset.
    • If DTC does reset 

      Replace the K9 Body Control Module.

    • Go to next step: If the DTC does not reset 
  6. All OK.
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