What is the reason the headlight adjustment screw doesn't work?
2 Answers
If the misalignment is caused by an accident, the positioning needs to be readjusted. However, in many cases, it's due to improper adjustment where turning the screw to the limit has no effect - this isn't caused by accidents or damage. In such situations, an experienced technician should perform the adjustment. Another possibility is that the bulb's original angle is incorrect, making adjustment impossible; in this case, simply replacing the bulb will suffice. Detailed information about headlight adjustment is as follows: 1. Standard for car headlight adjustment: Park the car 7.6 meters away from a wall, turn on the headlights, and adjust the beam position according to the light pattern on the wall, adjusting both high and low beams sequentially. Alternatively, you can drive the car onto a level road, align the low beam's focal point at 30 meters with two points overlapping, and adjust the high beam to be parallel with the ground. 2. Headlight height adjustment: The headlight height adjustment switch uses a rotary wheel marked with numerical gears. The numbers indicate the headlight height level - the higher the number, the higher the headlight beam points. Correct adjustment of headlight beam height is crucial, as the directional height of the beam not only affects actual illumination effectiveness but also significantly impacts driving safety for both your vehicle and others.
Last time I drove long-distance, I found the headlight adjustment screw was stuck and the beam remained misaligned. Driving at night was truly unbearable. I suspect the main causes are rusted screw threads seizing up, dirt or mud clogging the rotating parts, or internal gear wear causing looseness. It's also possible the car was bumped, shifting the position and deforming the entire mechanism. I recommend first trying some rust remover spray. If that doesn't work, avoid forcing it to prevent cracking the lamp housing. If the issue persists, promptly visit a professional auto repair shop for inspection. Proper headlight alignment isn't just about illumination - misaligned beams during turns can obscure roadside visibility and lead to accidents. This is a critical safety issue that requires immediate attention as it directly impacts driving safety.
