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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 >> Turn Signal Lamps and/or Indicators Malfunction >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, observe the scan tool Right Turn Signal Switch and Left Turn Signal Switch parameters while cycling the turn signal switch between the right and left positions. The readings should change between Active and Inactive.
    • If the parameters do not change between the selected states, refer to Turn Signal Switch Malfunction.
  2. Ignition ON, observe the right and left turn signal lamps while cycling the turn signal switch between the right and left positions. Verify the turn signal lamps turn ON and OFF.
    • If the turn signal lamps do not cycle between the selected states, refer to Turn Signal Lamp Malfunction.
  3. Command the Lamp Test ON and OFF with a scan tool. The left and right turn signal indicators should turn ON and OFF when changing between the commanded states.
    • If the left and right turn signal indicators illuminate during the test, replace the BCM.
    • If the left and right turn signal indicators do not illuminate during the test or remain illuminated at all times, replace the instrument cluster.
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