AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of ECM, Linkage and actuator. The SIECM which is mounted in rear wheel suspention detects the change of vehicle vertical location and control actuator ( which changes the vertical direction of the headlamp) based on the driving and load condition.The EEPROM is equipped with a temperatutre sensor which is used to avoid damage related to overtemperature.

The ECM sets DTC C1621 if measured temperature at temperature sensor in EEPROM is over 120 degree C for 2 seconds.