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Spotlight Company Introduces The Inspection Method Of Car Light Failure


Spotlight Company  introduces the inspection steps for […]

Spotlight Company  introduces the inspection steps for car light failure as follows:


① Check the fuse box. Most cars are equipped with fuse boxes. During the inspection, it is necessary not only to check whether the insurance is blown but also to find out the reason for the blow. If a lamp fuse is frequently blown or the fuse is blown as soon as the lamp is turned on, it is mostly because the lamp circuit has a short circuit. During the inspection, remove the connection on the lamp, connect one end of the wire to the fuse box, and connect the other end to the live wire of the lamp to test. If the brightness of the light is normal, the fuse is intact; it indicates that there is a short circuit in the connecting wire between the fuse box and the lamp. If the fuse box has normal voltage under normal conditions, proceed to the next inspection.


②Check the bulb. Whether the bulb filament is burnt can usually be confirmed by visual inspection. If the bulb becomes black or the filament is burned out, replace it with a new bulb. If the bulb filament is frequently burnt, it is mostly caused by the damage of the generator regulator and the excessively high output voltage. In this regard, a voltmeter can be used to check. If the generator output voltage is too high, it means that the regulator is damaged.


③Check the grounding. If the fuse and the bulb are normal, and the bulb live wire has normal voltage, check whether the ground wire is broken or has poor contact. Connect one end of the wire to the ground end of the bulb and the other end to the frame or the negative electrode of the battery to test. If the light brightness is normal, it can be judged as bad grounding. At the same time, check whether the lamp holder is oxidized, corroded, and has poor contact. This point should be paid special attention to.


④Check the line. Automotive lighting systems are usually equipped with control devices, such as light relays and dimming switches in automotive lighting systems. Therefore, during the inspection, if the far and near lights of the headlamp are not bright, check whether the dimmer switch socket is loose and whether the light relay can conduct the light circuit. If the visual inspection fails to confirm, the fault location can be determined by the method of wire short-circuiting, that is, using the wire to short-circuit the white wire post and the blue wire post of the light relay. If there is a sound, it means that the light relay is normal, and most of the fault lies in the dimmer switch or the light switch.