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Home >> Chevrolet >> 2006 >> Chevy Express G3500, Van Passenger Extended >> Repair and Diagnosis >> External Pages >> Different car >> Section 1319 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B1480 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the appropriate harness connector at each component fed by the inadvertent power courtesy lamp control circuit.
  2. Ignition ON, verify that a test lamp illuminates between the inadvertent power courtesy lamp control circuit at each component harness connector and ground.
    • If the test lamp does not illuminate, test the inadvertent power courtesy lamp control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the BCM.
  3. Connect each component one at a time and verify with a scan tool if the DTC resets as current.
  4. If the DTC resets, test or replace the inoperative component.
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