Checking the lamp failure of the exterior lamp is an extremely quick and simple task. However, comprehensive system maintenance of the exterior lighting is not that simple.
Timely maintenance of the exterior lights is critical to the driver as it not only affects the comfort of the drive, but is also directly related to the safety of the drive. Usually, before getting a reminder, it is difficult for the owner to realize that the headlights, taillights, turn signals or parking lights are not working properly. Incidentally, the replacement of the burnt bulb is very simple, and the cost of DIY is lower than the charging standard for the maintenance of the lighting system at the repair station.
In more cases, the failure of the lamp is not limited to small problems such as lamp burnout, socket rust or plug damage. It is often necessary to take professional diagnostic techniques to analyze the root cause of the fault. Even for low-priced cars, the internal and external luminaires are controlled by the host computer; for those luxury cars, only the front headlights are controlled by three computers.
If your car is equipped with Daylight Running Lamps (DRLs), you must first understand how these devices work. For example, some daytime running lights are not turned on before the engine is started; there are some daytime running lights. If the parking brake has not been canceled, the daytime running lights will still not work properly even if the engine has been started. If the vehicle is equipped with a light control lamp (that is, when the external light is dim to a certain extent, the system has the function of automatically turning on the headlights), it is worth checking the operation of the lamp during the process from the weakest to the strongest. Also don't ignore checking the auto-off timer. If the system is equipped with a timer, set it to the maximum delay.
If the headlights are damaged, they are usually replaced with similar luminaires. Some vehicles are equipped with a high-intensity discharge headlight HID that generates a high-density light source through a high-voltage arc discharge generated by its pre-designed electronic system. Note that ordinary quartz-halogen bulbs cannot be used here. In addition, check the headlight lens for cracks, because although the surface crack does not affect the lighting performance of the headlights, moisture will penetrate into the lamp along the cracks, which will definitely reduce the life of the lamp.
The calibration of the headlights' illumination direction should also be included in the list of maintenance items, as the headlights must be able to provide good forward illumination for the vehicle in order to ensure maximum safety for the driver.
Grasp the key, but also must not forget to check other lights, such as turn signals, license plate lights, width lights, parking lights, backup lights and brake lights (including the middle high brake light CHMSL). In addition, many vehicles also use fog lamps as standard equipment or popular options. Fog lights are generally installed in the lower position of the car, so they are extremely vulnerable to stone damage. In addition to checking the lighting system during maintenance Outside, the cracks in the headlight lens should not be ignored.
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