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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Headlamp Leveling Malfunction (Automatic) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Front Leveling Position Sensor Voltage parameter is between 0.5 and 4.9 V.
    • If the parameter is not between 0.5 and 4.9 V 

      Refer to Headlamp Leveling Sensor Malfunction.

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

      Refer to Headlamp Leveling Sensor Malfunction.

    • If the parameter is between 0.5 and 4.9 V 
  4. Verify the left and right headlamps operate to the UP and DOWN positions when commanding the Headlamps Vertical Motors 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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