It is an extremely quick and simple task to check the bulbs of lamps outside the car for burnout failures. However, it is not so simple to maintain a comprehensive system of exterior lamps. Timely maintenance of exterior lights is very important to the driver, because it not only affects the comfort of driving, but also directly affects the safety of driving. It is often difficult for car owners to realize that the headlights, taillights, turn signals or parking lights are not working properly before being reminded. By the way, the work of replacing a burnt out bulb is very simple, and the cost of DIY is lower than the charging standard for maintenance of the lighting system at the repair station.
In more cases, the failure of car lights is by no means limited to small problems such as bulb burnout, rusty socket or damaged plug. It is often necessary to adopt professional diagnostic techniques to analyze the root cause of the failure. Even for the most expensive cars, the internal and external lamps are controlled by the main computer; while for luxury cars, only the headlights are controlled by three computers.
If the car is equipped with DRLs (Daytime Running Lamps), you must first understand the working principle of these devices. For example, some daytime running lights cannot be turned on before the engine is started; for some daytime running lights, if the parking brake has not been cancelled, even if the engine has been started, the daytime running lights still cannot work normally. If the vehicle is equipped with light-controlled lights (that is, when the external light is dim to a certain degree, the system has the function of automatically turning on the headlights), you may wish to check the working conditions of the lights during the light sensitivity from the weakest to the strongest state. Of course Don’t neglect to check the automatic shutdown timer. If the system is equipped with a timer, please set it to the maximum delay.
If the headlights are damaged, they are usually replaced with similar lamps. Some cars are equipped with high-intensity discharge headlights HID, which generates high-density light sources through 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 surface cracks will not affect the lighting performance of the headlights, moisture will penetrate into the lamps along the cracks, which will inevitably reduce the service life of the bulb.
The calibration of the direction of the headlights should also be included in the list of maintenance items, because in order to ensure the maximum safety of the driver, the headlights must be able to provide good forward lighting for the moving vehicle.
While grasping the key, don’t forget to check other light systems, such as turn signals, license plate lights, width lights, parking lights, reversing lights, and brake lights (including the middle-high brake lights CHMSL). In addition, many vehicles also use fog lights as standard equipment or popular options. Fog lights are generally installed at a lower position on the car, so they are easily damaged by stones. When maintaining them, in addition to checking the lighting system In addition to itself, the cracks in the headlight lens should not be ignored.
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Link to this article：Introduction to the correct maintenance of exterior lamps
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