Why does high beam work but not low beam?

Headlight Fuse or Relay These are designed to ‘blow’ and break the circuit if too much power comes through them. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. If this relay goes bad, it could allow power to the high beams, but not the low beams.

Why is my low beam not working?

The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. About the only cause that is an easy fix is a blown fuse. Consult your owner’s manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.

Why do my LED headlights only work on high beam?

It’s likely that the LED headlight is built for a power switched system, which is why it only works on a single mode and may be wired “backward of correct” to even get that high beam working. Red/green is high beam and Red/yellow is low beam, the other wire is power.

What are the most probable causes for one low beam headlamp not working?

Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working.

What would cause one headlight to not work?

One headlight doesn’t work This is usually caused by a burned out bulb. You can Replace the bulb. If it still doesn’t work, suspect a wiring or fuse problem.

Why won’t my headlights turn on but my brights will?

2. Headlight Fuse or Relay is Bad. Like all electrical systems, the headlights in your vehicle have a fuse in the circuit to prevent too much electricity from reaching the bulb. There will also be a headlight relay that switches power from the low beams to the high beams.

Why won’t my high beams stay on?

By far the most common reason your brights will stop working is from a blown fuse or a bad relay. Or, it could be a bad relay. If the headlight relay has failed, it may not respond when you attempt to switch the high beams on. Replacing the relay should restore the system and get your high beams working once again.

Can a low beam headlight dimmer switch work?

Test Summary. The most common (and well, probably the only one) is usually the low beam headlights don’t work. In my personal experience, when the Low-High Beam Headlight Dimmer Switch has failed, you’ll only be able to roll around using the high beams only. Well, in this article, I’ll show you how to test it in a step-by-step way.

Why are the lights on my VW Beetle not working?

If the fuses and bulbs are fine, the switch is the likely issue. To remove, press the dial into the switch and turn it clockwise. In between “off” and the first setting, you should be able to pull the switch free from its housing by pulling it toward you.

Why are my headlights not working in high beam?

If just one bulb fails to work in either high beam mode or low beam mode, it may be the bulb. Most headlight failures that are limited to just high or low beams are related to a relay or the high beam control switch.

What are the headlights on a VW Beetle?

Once in, there are a few fuses that you’ll need to check. 18 and 19 are the high beams, 20 and 21 are the low beams, and 22 and 23 are the parking lights. Check each of these individually and replace them as needed.

Why are my low beam headlights not working?

If a headlight fuse blows, it could cause the headlights to stop working. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. If this relay goes bad, it could allow power to the high beams, but not the low beams.

Why does MY BMW headlight fog up when high beam is on?

Headlight fogging is caused when polycarbonate is exposed to ultraviolet light and exhaust emissions, as a chemical reaction occurs which causes the headlights to fog up. With headlight fogging, the light released from the headlight is hard to see even when both the high and low beams are switched on. How can these problems be resolved?