How to adjust car headlights
The adjustment of car headlights is an important part of daily vehicle maintenance. Correctly adjusting headlights can not only improve driving safety at night, but also avoid dazzling other drivers. This article will introduce in detail the adjustment steps, precautions and related data of car headlights to help car owners easily complete this operation.
1. Why should we adjust car headlights?
The illumination angle of car headlights can shift due to vehicle load, suspension system changes, or long-term use. Improperly adjusted headlights can cause the following problems:
1. The irradiation distance is too close, which reduces the range of vision at night.
2. The illumination angle is too high, affecting the driver’s view of oncoming vehicles.
3. The left and right lights are asymmetrical, forming a blind spot in the field of vision
2. Preparations before adjustment
| Project | request |
|---|---|
| vehicle status | Empty (no passengers and cargo), fuel tank half full |
| Venue requirements | Flat ground with a vertical wall in front (5-10 meters away) |
| Tool preparation | Phillips screwdriver, tape measure, tape |
| Time selection | At dusk or night, it is easy to observe the lighting effect |
3. Detailed adjustment steps
1.Positioning adjustment screw: Most vehicles have vertical and horizontal adjustment screws behind the headlights, usually marked "UP/DOWN" and "LEFT/RIGHT".
2.Measurement base height:
| Measurement items | method |
|---|---|
| Headlight center height | Vertical distance from the ground to the center point of the headlight |
| wall mark height | Mark a horizontal line on the wall 2-5 cm lower than the center of the headlight |
3.Low beam adjustment:
• Turn on the low beam headlights and observe the light pattern tangent line
• Adjust the vertical screws to align the light pattern tangent with the wall mark
• Adjust the horizontal screws to align the center of symmetry of the light pattern with the centerline of the vehicle
4.High beam inspection:
• Switch to high beam mode
• Make sure the center of the light spot is slightly higher than the dipped beam tangent line
• Left and right lights should be symmetrical
4. Adjustment differences of different types of headlights
| Headlight type | Adjustment features |
|---|---|
| Halogen headlights | Obvious light pattern, easy to observe tangent lines |
| xenon headlights | Please pay attention to the startup time and adjust the brightness after it is stable. |
| LED headlight | Most are integral designs with small adjustment ranges |
| Laser headlights | It is recommended to be adjusted by professionals |
5. Frequently Asked Questions
1.Q: What should I do if the lighting is still not ideal after adjustment?
A: Check whether the headlight lens is aging and yellowing, or consider replacing the light bulb.
2.Q: Do automatic headlights need to be adjusted manually?
A: Automatic headlights usually have a self-checking function, but the basic angle still needs to be checked regularly.
3.Q: Is it normal for the left and right lights to be inconsistent in height after adjustment?
A: Some models are designed to be lower on the left and higher on the right to avoid irradiating oncoming drivers.
6. Professional advice
For car owners who are not familiar with vehicle structure, it is recommended to go to a professional repair shop for light inspection every 2 years or after replacing the light bulb. Regular repair stations use optical calibration instruments to ensure that the adjustment accuracy reaches ±0.1 degrees, which is an accuracy that is difficult to achieve with manual adjustment.
Correctly adjusted car headlights should meet the following standards:
| Test items | Qualification standards |
|---|---|
| Low beam irradiation distance | There is an obvious light tangent line at 40-50 meters |
| High beam irradiation distance | There is a clear light spot at 100-150 meters |
| Left and right deviation | No more than 1.5 degrees |
| Upper and lower deviation | Not more than 1 degree |
Through the above steps and standards, car owners can ensure that their car headlights are in optimal working condition, which not only ensures their own driving safety, but also avoids causing interference to other road users.
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