Car headlight maintenance
Includes the following points: check the sealing of the headlights, clean the rearview mirror, clean the bulb, adjust the direction of the light beam, etc. Car headlights, also known as car headlights and LED daytime running lights, as the eyes of the car, are not only related to the external image of a car owner, but also closely related to safe driving at night or in bad weather conditions. The use and maintenance of car lights cannot be ignored.
- Check the sealing of the headlights: If water vapor invades the headlights, the service life of the bulb will be reduced, so pay attention to check the sealing of the headlights. If the sealing ring between the light distribution mirror and the reflector is found to be damaged, it should be replaced in time.
- Clean the reflector: If the reflector of the semi-enclosed headlight becomes black and the light intensity decreases, it should be replaced. If there is only dust on the mirror, do not replace it, but blow it clean with compressed air. For mirrors that cannot be blown clean, if the coating material of the mirror is chrome-plated, due to its high hardness, deerskin dipped in anhydrous ethanol (content above 95%) can be used to gently and carefully wipe it from the inside of the mirror to the outside in a spiral shape. If the mirror is silver-plated or aluminum-plated, due to poor hardness, it can only be cleaned with clean cotton dipped in hot water, and never wipe it to avoid damaging the mirror coating.
- Clean the bulb: When there is dust on the halogen bulb, it can be scrubbed with absorbent cotton soaked in ethanol (90%). When scrubbing, be careful not to do it when the light has just gone out and there is residual heat in the bulb. After cleaning, it should be wiped dry instead of drying. Do not turn on the power immediately after touching the bulb with your hands or rags, otherwise it will lose its luster or even cannot be restored.
- Adjust the direction of the beam: During the driving of the car, the vibration of the car body will cause the direction of the beam to deviate, so the direction of the beam will be specially checked during the annual inspection. During regular maintenance, technicians can also be asked to check and adjust the direction of the beam. Generally, screen adjustment is used. Before checking, pay attention to ensure that the tire pressure reaches the standard value.
What is the reason why the car headlights are not on? According to different fault phenomena, analyze the specific causes of the fault.
Led headlights are not on 1. Fault: When the switch is turned on, all lights are off, or when the light switch is turned on to a certain position, all lights in that position are off. 2. Cause of fault: (1) The power line before the light switch is open or grounded; (2) The fuse in the line is tripped or burned out; (3) The bimetallic contact of the light switch is poor or not closed, or the light switch is damaged; (4) After a certain position of the light switch is turned on, part of the light line is grounded, causing the bimetallic contact to disconnect; (3) When diagnosing and troubleshooting a fault, the diagnosis range should be determined first. You can explore according to the order of the light lines. In order to find an open circuit or short circuit somewhere. (1) Test by pressing the horn or turning the signal switch. If the horn sounds and the turn signal lights up, it means that the power line before the fuse is intact. Therefore, the wiring precautions of the ammeter, ignition switch terminal, light switch terminal, etc. can be checked in sequence. If the line connection is good, the light switch may be damaged. (2) Try to press the horn and pay attention to safety. It means that the power line before the fuse is open or the wiring is poor. If the fuse trips, it means that there is a ground in the line behind the fuse. You can remove the power cord of the horn and turn signal, and then press the fuse button to test. If there is no tripping again, the light will light up after the light switch is turned on, indicating that the grounding point is on the horn or turn signal circuit. If the fuse still trips, the grounding position can be found in sequence by the short-circuit method. (3) Whether the power terminal of the light switch has a good ignition test. When the light switch is turned on in a certain gear, the bimetallic contact is often disconnected and the light does not light up, which means that the light line of this gear is grounded somewhere. (4) When driving at night, all lights suddenly go out. In this case, stop the car immediately and test with the horn. If the horn sounds, it means that the power supply is still good, and you still need to find out in sequence whether the light line is grounded or disconnected. If the horn does not sound, it may be caused by vibration during driving, power cord falling off, or wire breakage.
