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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 76 (Auto Headlamp Leveling System Diagnosis (HEV)) >> DTC C1604: ECU Fault >> Component Inspection

Component Inspection

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■ Check AHLS-ECU 

  1. Connect scantool to Data Link Connector (DLC).
  2. Engine "ON" and Head lamp "ON".
  3. Erase the DTC with scantool.
  4. Is it possible to erase the DTC with Scantool?

    YES 

    NO 

    • Substitute with a known-good "AHLS-ECM (SENSOR)" and check for proper operation. If the problem is corrected, replace "AHLS-ECM (SENSOR)" and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.
    CAUTION: Perform Vehicle Selection and Level Initialization with scantool if AHLS ECM is replace. (Auto Levelling Sensor)
    Fig 1: Screen Display - Vehicle Selection And Leveling Initialization 1
    G10602913Courtesy of HYUNDAI MOTOR AMERICA
    Fig 2: Screen Display - Vehicle Selection And Leveling Initialization 2
    G10602914Courtesy of HYUNDAI MOTOR AMERICA
    Fig 3: Screen Display - Vehicle Selection And Leveling Initialization 3
    G10602915Courtesy of HYUNDAI MOTOR AMERICA
    Fig 4: Screen Display - Vehicle Selection And Leveling Initialization 4
    G10602916Courtesy of HYUNDAI MOTOR AMERICA