What would cause headlights not to work?

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. The cause: A burned out bulb, or a problem with the high beam switch or relay. The fix: Replace the bulb, switch, or relay.

How do you fix headlight failure?

Headlight Failure

1. First, try your dimmer switch. Often that will turn them back on again.
2. Try the headlight switch a few times. If that does not work, use your parking lights, hazard lights, or turn signals.
3. Pull off the road as soon as you can and leave your hazard lights on so that other cars can see you.

How do you diagnose headlight problems?

Diagnosing the issue is a straightforward process.

1. Turn on your headlights. Replace whichever headlight bulbs do not turn on.
2. Open the engine compartment fuse box. Pull the fuse that operates on the non-functioning headlight circuit.
3. Connect the negative lead of the voltmeter to the negative terminal on the car battery.

Will AutoZone fix my headlight?

Autozone doesn’t offer mechanic services, though they are able to replace headlight bulbs in certain situations. Make sure the bulbs you’re getting are going to fit your vehicle or you can go to AutoZone.com or follow the AutoZone app.

What are the signs of a bad headlight switch?

Usually a bad or failing headlight switch will produce a few symptoms that can alert the driver of a potential issue.

• Issues switching between modes. One of the most common symptoms of a faulty headlight switch is issues switching between headlight modes.
• Issues with the high beams.
• None of the lights work.

What should I do if my headlight light is not working?

The best way to do this is to turn the headlight switch on, connect the negative lead on your meter to a known good ground, and touch the positive lead to each headlight connector terminal. One of the terminals should show battery voltage, and the other two should show nothing if the problem is burned out bulbs.

What to do if your HID light bulb is not working?

The easiest way to verify that your HID headlight capsule is bad is to carefully remove both bulbs and replace the one that doesn’t work with the one that does. If the known-good bulb fails to turn on when placed in the other socket, then you’re dealing with a more complicated issue.

Why are my high intensity discharge ( HID ) headlights not working?

High intensity discharge (HID) headlights can also fail due to other associated components. Neither of the headlights work. The cause: Burned out bulbs, or an issue with power or ground. The fix: Check for power and ground, and fix if necessary. Otherwise, replace the bulbs.

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.