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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2575 >> Circuit/System Testing

Circuit/System Testing

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Headlamp Relay Control Circuit Test

  1. Ignition OFF, disconnect the headlamp relay.
  2. Connect a test lamp between the relay coil control circuit terminal 86 and battery voltage.
  3. Ignition ON, command the headlamps on and off with a scan tool and verify that the test lamp turns on and off.
    • 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.
  4. If all circuits test normal, test or replace the relay.
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