HEADLIGHT NOT WORKING?

Driving with a malfunctioning headlight is a situation no driver wants to face, as it not only poses the risk of a fine but also endangers safety. For the issue of one headlight not working, there are many possible causes. Therefore, this article aims to thoroughly examine the common reasons for one headlight failure and provide solutions to help you quickly and accurately diagnose and address the issue, ensuring you can effectively deal with the problem and resolve any headlight malfunctions promptly.

Before we delve into the potential causes of a malfunctioning headlight, it is important to have a basic understanding to headlight systems operation. So that we can understand why those reasons may be the culprit of a headlight not working.

HOW DO HEADLIGHTS WORK?

Most vehicles have a relatively simple design for their headlight working system, of course, some modern vehicles will have adaptive headlights or a design where the headlights share the same bulb as the daytime running lights. But it basically involves a car battery, fuses, a light switch, relays and bulbs. When the headlight control switch is activated on the car signal lever or panel, it triggers a relay that allows the flow of electricity from the battery to the headlights, enabling headlights working. During this process, the fuse will act as a supervisor and protect the normal circuitry, in the event of excessive current or a short circuit, the fuse will blow itself and stop the whole system working.