Do you ever get into your vehicle, turn on your lights, and find out that your headlights just aren’t what they used to be? It could be that one doesn’t turn on, or both don’t turn on, or that they’re just a little dim, or that they get dimmer sometimes and brighten up other times. In any situation, none of these are good and all should get looked at by your dealer so that your lights will be back in business ASAP. Check out what could be going on below!

When one headlight doesn’t work – Usually caused by a burned out bulb. High-intensity discharge (HID) headlights can also die because of other components.

When neither of the headlights work – Bulbs usually don’t burn out together, but it’s still important to rule that out by checking for power, but it was probably caused by a bad component like a fuse, relay, or module, or even by bad wiring.

When your high beam headlights don’t work or your low beams don’t work – If just one bulb won’t work in either high beam mode or low beam mode, it could be a busted bulb. Most headlight failures that are limited to just high or low beams are related to a relay or the high beam control switch.

When your headlights work but seem dim – If your headlights always seem dim, the problem could be foggy lenses or worn out bulbs. If they get dimmer and brighter intermittently, it could be a problem in your charging system. Give your headlights a wash with some cleaning solution to make sure they’re not just dirty.

Information from https://www.lifewire.com/fix-non-working-headlights-4137021