Why is the low beam not working?

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When the low beam of the headlight is not working, the possible issue could be a burnt-out filament. The solution is to replace the high-low beam bulb. During inspection, first check if the switch has power. If not, then examine whether the fuse has any abnormalities as a preliminary diagnosis. Additional information: 1. The low beam is designed for close-range illumination, with requirements focusing on a wide coverage area, short projection distance, and non-adjustable focus. 2. The low beam must be turned on under the following circumstances: (1) Driving in areas without streetlights at night, or during dusk when it's dark or at dawn when daylight is just emerging. (2) In conditions of heavy fog, snow, or heavy rain where visibility is obstructed, the low beam must be turned on even during the day. (3) On certain road sections where lighting is available but insufficient, the low beam should also be activated.