Car headlights function
The main role of car headlights includes the following aspects :
Provide illumination : Headlights provide sufficient visibility for the driver to see roads, pedestrians, other vehicles and obstacles at night or in low visibility conditions. The irradiation distance of the near-light lamp is about 30-40 meters, the irradiation range is wide, about 160°, and the light of the high-beam lamp is concentrated, the brightness is high, and the light can be irradiated to a farther place .
improved visibility : By illuminating the road, headlights help to improve visibility for drivers and other road users, thereby reducing the risk of accidents .
At night or in low visibility environments, headlights can ensure that the driver can see the road ahead clearly, reducing traffic accidents caused by poor vision.
Avoid glare : Headlights are usually designed to prevent light from shining directly into the line of sight of other drivers, thus reducing the possibility of glare .
When meeting at night, switching to the low light can avoid the interference of the high beam on the other driver's line of sight, ensuring that both sides can drive safely.
Compliance : In many areas, drivers are required to turn on their headlights at night or in low visibility conditions to comply with local traffic laws .
In addition, the lighting effect of headlights directly affects the operation and traffic safety of driving at night. Traffic management departments all over the world generally provide for the lighting standards of car headlights in the form of laws .
Enhanced safety : Headlights are especially important in adverse weather conditions, such as fog, rain, snow, and other conditions that reduce visibility. They help drivers see the road ahead better, thereby reducing the risk of accidents .
The main causes of car headlight failure include the following :
bulb damage : the bulb may burn out or the filament age due to too long use, resulting in dimming or even no light. In this case, replacing the bulb with a new one can solve the problem .
circuit fault : loose, corrosion or short circuit of the headlight circuit connection will affect the normal transmission of current, resulting in the headlight is not bright. Electrical problems need to be checked and fixed .
blown fuse : When the current of the headlamp exceeds the rated value of the fuse, the fuse will blow, causing the headlamp to fail to light. The blown fuse needs to be found and replaced .
relay fault : The relay controls the switch of the headlight. If the relay is faulty, the headlight may not be on or off .
control system failure : vehicle light control system failure will also cause the headlights can not work normally, need to check and repair the control system problem .
filament blown or wiring problem : filament aging or wiring problems will cause the headlight is on when not on, need to be replaced in time or by professional investigation .
battery loss : when the battery can not effectively store electricity, the alternator-driven lighting engine speed change will affect the power generation efficiency, resulting in headlights on when not on .
conductor heating : conductor heating will lead to the headlamp line resistance increase, brightness decrease, serious will lead to short circuit .
generator problem : burnt out diodes and coils of the generator can also cause the headlights to go off .
Diagnosis and maintenance methods :
Appearance Check the cable connection : After the headlamp switch is turned on, carefully check whether the connector of the headlamp harness is firmly inserted, and observe whether the conductor is broken, lost, or burned .
bulb check : After disconnecting the headlamp wiring harness connector, use a multimeter to measure the resistance value of the far and near light filament. If the filament is burned out, it is necessary to replace the lamp .
fuse or fuse inspection : for vehicles equipped with fuses, check that the fuse button is disconnected. If it is blown, replace it with a new fuse .
relay and switch inspection : check that relays and switches are working properly and replace or repair them if necessary .
control system check : check whether the lighting control system is working properly, and repair it if necessary .
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