How to adjust car headlights left and right
The adjustment of car headlights is an important part of ensuring night driving safety, especially the adjustment in the left and right directions, which directly affects the lighting range and avoids glare. The following is a summary of hot topics and practical methods on car headlight adjustment in the past 10 days across the Internet to help car owners quickly master the adjustment skills.
1. Why do you need to adjust the left and right directions of the headlights?
1.avoid glare: Improper left and right angles may dazzle drivers of oncoming vehicles and cause safety hazards.
2.Optimize lighting range: Make sure the lights cover the lane and road shoulders to avoid blind spots.
3.Compliance: Some countries and regions have clear regulatory requirements for the angle of illumination of vehicle lights.
2. Adjustment tools and preparation
| Tools/Materials | Purpose |
|---|---|
| Phillips screwdriver | Adjust headlight screws |
| tape measure | Measure distance and height |
| Wall or special target | Cast light reference |
| gloves | protect hands |
3. Detailed explanation of adjustment steps
Step 1: Choose the right environment
At night or in a dark environment, park the vehicle on flat ground, about 5-10 meters away from the wall.
Step 2: Mark the guide lines
Mark the following reference points on the wall:
- Vehicle centerline
- Headlight center height line
- Standard left and right irradiation range (usually low left and high right to avoid glare)
| reference line | Description |
|---|---|
| center line | Aligned with the longitudinal center axis of the vehicle |
| height line | Approximately the center height of the headlight from the ground |
| Left and right offset lines | The left light is deflected 10cm to the right, the right light is directed or slightly deflected |
Step 3: Find the adjusting screw
Open the hood and locate the lateral adjustment screw (usually marked "L-R" or left and right arrows) behind the headlight.
Step 4: Fine-tune the left and right angles
Turn on the low beam, use a screwdriver to slowly rotate the adjusting screw, and observe the movement of the light spot on the wall:
-clockwise: The light moves to the right
-Counterclockwise: The light moves to the left
4. Precautions
1. When adjusting on one side, the headlight on the other side needs to be blocked.
2. Some models require auxiliary adjustment through the central control menu.
3. If the adjustment is ineffective, the headlight bracket may be damaged and requires professional maintenance.
5. Popular questions and answers
| question | Answer |
|---|---|
| Can LED headlights be manually adjusted? | Yes, but some models require special tools |
| What should I do if the light diverges after adjustment? | Check whether the lampshade is aged or the lens is dirty |
| What is the difference between left and right adjustment and up and down adjustment? | Adjust up and down to control the irradiation distance, adjust left and right to control the horizontal range |
6. Summary
Correctly adjusting the left and right direction of the headlights can not only improve driving safety, but also avoid being punished by the traffic police. It is recommended to recalibrate every 1-2 years or after replacing the lamp. If you are not confident in the operation, you can go to a 4S shop or professional maintenance center to complete the adjustment.
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