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It’s common for one headlight to quit working on one setting, either high beam or low. That’s often a sign that the bulb is burnt out. But if one or both headlights go out completely, then it’s likely there’s a problem with the headlight relay, the fuse, the module, the headlight switch, the dimmer switch, or even a wiring fault.
A top-rated mobile mechanic will come to your home or office to determine the cause of the nonworking headlight, and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs.
The first step for the mechanic will be to check the fuse. If it’s blown, the mechanic will replace it and see what happens. If it isn’t blown, but the lights are still out, the technician will check for power at the fuse with a voltmeter or test light. If there's no power, there’s a problem in the wiring that will need to be tracked down. If there is power, the next step is to check the lighting relay.
If the relay rattles when shaken, it’s probably bad, but the mechanic will test it thoroughly. If it’s still good, then the technician will likely turn attention to the light switch itself. These items experience thousands of on-off actions throughout the car’s life, and some eventually succumb to wear.
A nonworking headlight presents a safety risk. Book a mechanic to perform a thorough inspection as soon as possible.