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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1293 (Lighting Systems) >> Diagnostic Information and Procedures >> Park, License, and/or Tail Lamps Malfunction >> Circuit/System Testing >> Exterior Lamps Circuit Test

Exterior Lamps Circuit Test

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate park, marker, license, or tail lamp.
  2. Verify that a test lamp illuminates when connected between B+ and the listed ground circuit terminal.
    • Front park lamp terminal G
    • Tail lamp terminal GRD
    • Marker and clearance lamps terminal A
    • License lamp terminal B
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, connect a test lamp between the listed control circuit terminal and ground.
    • Front park lamp terminal MAJ
    • Tail lamp terminal MNR
    • Marker and clearance lamps terminal B
    • License lamp terminal A
  4. Command the parking lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the appropriate lamp.
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