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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 439 (Lighting System) >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction (With T4Q) >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, Headlamps OFF, command the Low Beams ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states.
  2. Headlamps OFF, command the DRL ON and OFF with a scan tool. The daytime running lights should turn ON and OFF when changing between the commanded states.
    • If the daytime running lights do not change between the commanded states, refer to Daytime Running Lamp Malfunction.
  3. Observe the scan tool Ambient Light Status parameter while supplying sufficient light to simulate daylight conditions to the ambient light sensor. After 30 seconds, the parameter should be Day.
    • If not the specified value, refer to Ambient Light Sensor Malfunction.
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