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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 >> Rear Fog Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, observe the scan tool Rear Fog Lamp Switch parameter while turning the rear fog lamp switch ON and OFF. The parameter should change between Active and Inactive.
    • If the parameter does not change between the selected states, refer to Rear Fog Lamp Switch Malfunction.
  2. Turn the rear fog lamps ON and OFF with the front fog lamps switch. The rear fog lamps should turn ON and OFF as selected.
    • If the rear fog lamps do not change between the selected states, refer to Rear Fog Lamps Malfunction.
  3. Command the Lamp Test ON and OFF with a scan tool. The rear fog lamps indicator should turn ON and OFF when changing between the commanded states.
    • If the rear fog lamps indicator illuminates during the test, replace the BCM.
    • If the rear fog lamps indicator does not illuminate during the test or remains illuminated at all times, replace the instrument cluster.
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