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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Lighting System) >> Diagnostic Information and Procedures >> DTC B1480 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X3 harness connector at the BCM.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the B+ circuit fuse is open, test the control circuit and components listed below for a short to ground. If all circuits and components test normal, replace the BCM.

    BCM Harness Connector X2 Terminal 1

    • Underhood Lamp
    • Front Courtesy/Reading Lamp
    • Middle Courtesy/Reading Lamp
    • Rear Courtesy/Reading Lamp
    • Left Sunshade Lamp
    • Right Sunshade Lamp
  3. If all circuits test normal, replace the BCM.
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