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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1552 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1480CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U

Circuit/System Testing

2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. 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 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.
    • If the DTC resets, test or replace the inoperative component.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.