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A Mercedes Benz ML350 sport utility vehicle with a mileage of about 20 thousand km in 2012. User response: the meter indicates the headlight failure. Inspection and analysis: the maintenance personnel tried the car and found that the left headlamp of the vehicle could not turn off. Further tests also found that the left headlamp swung normally at the time of self test after the vehicle started, but there was no swing at the top and bottom. Detect headlamp control unit and find fault code B168401---- left front lamp elevation swing to execute motor fault. Since the motor can not be replaced individually, the headlamp assembly must be replaced if the fault occurs. The price of headlamp assembly is high, so it is necessary to further clarify the cause of the failure before making a replacement decision.