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Home >> Chevrolet >> 2009 >> Traverse LS, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2545 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Acadia, 2011 Chevrolet Traverse, and 2011 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the backup lamp.
  2. Test for less than 5 Ω between the ground circuit terminal listed below and ground:
    • RPO Z88 - terminal 1
    • RPO WDA - terminal 2
    • RPO W49/X88 - terminal B
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and the ground circuit terminal:
    • RPO Z88 - terminal 2
    • RPO WDA - terminal 1
    • RPO W49/X88 - terminal A
  4. Command the Backup 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 voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the backup lamp.
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