COMMENTS ON TROUBLE SYMPTOM
When the headlights cannot be switched from low beam to high beam and vice versa on an automatic basis frequently, any of the followings are suspected: bad weather (heavy rain, snow, icing), unfavorable road condition, ambient environment, blocked FCM/LDW/AHB-ECU sensor or its surroundings (cracks, contamination, icing, fog on the windshield or the sensor), a faulty FCM/LDW/AHB-ECU.