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Home >> Hummer >> 2008 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2645 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the ambient light sensor.
  2. Ignition ON, verify the scan tool ambient light sensor parameter is 0.02 volt.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ambient light sensor.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. If all circuits test normal, replace the BCM.
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