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Home >> Hummer >> 2010 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2575 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Canyon and 2010 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the HDLP relay.
  2. Connect a test lamp between the relay control circuit terminal 85 and B+.
  3. Ignition ON, command the Headlamps 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.
  4. If all circuits test normal, test or replace the relay.
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