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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Headlamp Leveling Malfunction (Automatic) >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool Front Leveling Position Sensor Voltage parameter is between 0.5 and 4.9V.
    • If the parameter is not between 0.5 and 4.9V 

      Refer to Headlamp Leveling Sensor Malfunction.

    • If the parameter is between 0.5 and 4.9V 
  3. Verify the scan tool Rear Leveling Position Sensor Voltage parameter is between 0.5 and 4.9V.
    • If the parameter is not between 0.5 and 4.9V 

      Refer to Headlamp Leveling Sensor Malfunction.

    • If the parameter is between 0.5 and 4.9V 
  4. Verify the left and right headlamps operate to the UP and DOWN positions when commanding the DHL Motor Control UP and DOWN with a scan tool.
    • If the left and right headlamps do not operate UP and DOWN  

      Refer to Headlamp Leveling Actuator Malfunction

    • If the left and right headlamps operate UP and DOWN  
  5. All OK.
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