How to adjust H4 headlights?
2 Answers
The adjustment method for H4 headlights is as follows: 1. The H4 headlight adjustment button is located at the lower left of the driver's dashboard, and the vertically sliding wheel on the right is the headlight beam adjustment device. 2. Depending on the vehicle load, four beam levels (0, 1, 2, 3) are typically recommended. Adjust the light brightness by switching between these levels. 3. Additional information: Car headlights, also known as car front lights or car LED daytime running lights, serve as the 'eyes' of a vehicle. They not only affect the owner's external image but are also crucial for safe driving at night or under adverse weather conditions.
I've adjusted my H4 headlights several times, and it's quite simple. First, park on a level surface facing a wall about 5 meters away, then turn on the high beams to see the light pattern. Use a Phillips or hex screwdriver to adjust the vertical screw at the back of the headlight, turning it downward to fix the beam's center at a moderate height on the wall—don't set it too high to avoid dazzling other drivers. The horizontal adjustment screw usually doesn't need much tweaking. I check and readjust after every car wash or long trip since road vibrations can shift the alignment. DIY saves time and effort, requiring only basic tools. Beginners unsure about the process can refer to the car manual or online video tutorials for their specific model, ensuring the engine is off for safety. Proper headlight alignment reduces nighttime blind spots, greatly improving driving safety and preventing unnecessary bulb wear for longer lifespan.
