The function of car headlights
The headlights of a car mainly provide road lighting at night or in low-visibility environments, ensuring that drivers can clearly identify obstacles ahead. At the same time, they have a warning function to enhance driving safety.
Core function
Youdaoplaceholder0 lighting : It illuminates the road ahead in low visibility conditions such as at night and in rainy or foggy weather, clearly identifying obstacles within 100 meters to ensure driving safety.
Youdaoplaceholder0 Anti-glare : By adjusting the beam Angle, it avoids glare for drivers of oncoming vehicles and reduces the risk of traffic accidents.
Youdaoplaceholder0 Warning function : Daytime running lights can enhance vehicle recognition and reduce the risk of accidents during the day.
Specific application
Youdaoplaceholder0 high and low beam lamps : Low beam lamps are used on sections with street lamps, while high beam lamps are suitable for roads without lighting. Alternating the use of the two can enable communication with other drivers.
Youdaoplaceholder0 fog lamp : Strong penetration, enhancing vision in rainy and foggy weather.
Youdaoplaceholder0 Turn signal : indicates lane changing or turning, ensuring lane changing safety.
The headlight designs of different vehicle models vary. For instance, structures such as closed and projected ones can enhance the lighting effect and the overall image of the vehicle.
Car headlight malfunctions may be caused by various reasons. The following are common causes and solutions:
Bulb problem
Youdaoplaceholder0 Bulb damage : Long-term use or quality issues may cause the filament to burn out. A new bulb needs to be replaced.
Youdaoplaceholder0 filament aging : After long-term use, it may turn black and lose brightness, and a new bulb needs to be replaced.
Circuit problem
Youdaoplaceholder0 Fuse blowout : Overload or line fault may cause the fuse to blow. It is necessary to check and replace it with a fuse of the same specification.
Youdaoplaceholder0 line fault : Short circuit, open circuit or poor contact in the line can cause abnormal power supply. The line needs to be inspected and repaired.
Youdaoplaceholder0 Relay fault : Burning or poor contact of the lighting relay will interrupt the current transmission and the relay needs to be replaced.
Power supply issue
Youdaoplaceholder0 Low battery : Insufficient battery power can cause the lights to dim or fail to illuminate. It needs to be charged or the battery replaced.
Youdaoplaceholder0 Generator failure : Abnormal output voltage of the generator may affect the stability of the lighting and requires maintenance or replacement.
Control system problem
Youdaoplaceholder0 Control module abnormality : ECU or sensor failure may cause the light adjustment to fail. A diagnostic tool should be used to read the fault code.
Youdaoplaceholder0 automatic leveling fault : Abnormal data from the body attitude sensor or motor jamming may affect the dimming. The sensor needs to be recalibrated or the motor repaired.
If you have difficulty troubleshooting by yourself, it is recommended that you contact a professional technician for inspection and repair.
The core method to eliminate the fault code of the headlight is to use the OBD-II scanner to clear the fault code, the system will automatically clear it after replacing the faulty bulb, or disconnect the negative terminal of the battery to reset the system. If it is caused by modification (such as replacing LED bulbs), compatibility issues (such as adding resistors or changing the code) need to be resolved before clearing.
Basic elimination method
The following methods are applicable to most scenarios where headlight fault codes are eliminated. It is necessary to first ensure that there are no physical faults in the bulbs, circuits, etc.
Youdaoplaceholder0 To clear using the OBD-II scanner: Connect the vehicle to the diagnostic tool and operate through the "Special Features" or "Fault Code Clearing" menu. The specific steps vary depending on the model of the tool. Please refer to the manual or contact the manufacturer for support.
Youdaoplaceholder0 automatically clear after replacing the faulty bulb : If the fault is caused by a damaged bulb, the system usually automatically resets the fault code after replacing a new bulb. The operation steps include:
Unplug the power socket of the bulb (with moderate force to avoid damaging the wiring).
Remove the waterproof cover (made of soft rubber or plastic, and gently break it off).
Pinch the steel wire retaining ring to remove the old bulb, install the new one and fix it.
Reinstall the waterproof cover and the power socket.
Youdaoplaceholder0 Disconnect the negative terminal of the battery to reset : After the vehicle is turned off, disconnect the connection wire of the negative terminal of the battery and wait for 15 seconds before reconnecting. This can clear the system error code.
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