Q:

What does it mean when my headlights don't work but my high beams do?

A:

Quick Answer

When low-beam headlights do not work, but high beams are functioning correctly, the most likely cause is a bad dimmer switch. A bad dimmer switch can also result in the opposite problem, where low beams working but high beams are not. Dimmer switches are usually integrated in the steering column where the headlight switch is mounted.

Continue Reading
What does it mean when my headlights don't work but my high beams do?
Credit: Caspar Benson Getty Images

Full Answer

To test the dimmer switch, necessitates removing part of the steering wheel column and possibly the dash panels in order to access the wires. A multimeter is necessary for testing voltage, and a wire-piercing probe makes the test process easier. There are three relevant circuits; the high-beam headlight feed, the low-beam headlight feed and the headlight-switch input. Check the headlight-switch input first to make sure a signal is present. Test the low-beam feed next and determine whether any voltage is present in the feed. If, after several tests, the multimeter does not register voltage, the low-beam switch is faulty.

Repeat the testing with the high-beam headlight switch only if the low-beam switch is confirmed to be working. If, after several tests, the multimeter does not register voltage, then the low-high-beam dimmer switch is faulty.

Headlight bulbs contain both high-beam and low-beam filaments. If the dimmer switch is not at fault, one of the filaments may have gone bad, and the bulb must be replaced.

Learn more about Car Parts & Maintenance

Related Questions

  • Q:

    What are some distinct features of the Oldsmobile 98?

    A:

    The Oldsmobile 98 is a sedan with a front-positioned engine powering rear wheels.The Oldsmobile 98 included more advanced features such as a Hydramatic automatic transmission, an automatic headlight dimmer and a feature called Twilight Sentinel, which automatically turned the headlights on and off using a timer.

    Full Answer >
    Filed Under:
  • Q:

    How does one wire a two-way dimmer switch?

    A:

    To wire a two-way dimmer switch, you need a neon voltage tester, a flat-head screwdriver, needle-nose pliers and a dimmer switch. A two-way dimmer switch you can control the light from two different locations.

    Full Answer >
    Filed Under:
  • Q:

    What are dimmable CFL bulbs?

    A:

    Dimmable CFL bulbs are energy-saving light bulbs that dim room lighting when used with an installed dimmer switch. These bulbs are estimated to conserve about 75 percent more electricity than traditional incandescent bulbs. In addition, CFL bulbs last 10 times longer than regular light bulbs while generating less heat.

    Full Answer >
    Filed Under:
  • Q:

    What is a 3-way dimmer switch?

    A:

    A three-way dimmer switch is a light switch that works in conjunction with another light switch to operate a common lighting element. Either one or both of the light switches also control the intensity of the light output.

    Full Answer >
    Filed Under:

Explore