Why Would Both Headlights Go Out Simultaneously

Posted in Headlight Bulbs
  • I drive an 05 Honda civic and when i went to turn my headlights on this morning they both came on, and then simultaneously went out. I’ve checked both fuses and they look fine. Also, i did a visual check of the headlight bulbs and they also look fine. This morning was the coldest of the year thus far (20something degrees), which may or may not have anything to do with it.
    i drive an 05 Honda civic and when i went to turn my headlights on this morning they both came on, and then simultaneously went out. I’ve checked both fuses and they look fine. Also, i did a visual check of the headlight bulbs and they also look fine. This morning was the coldest of the year thus far (20something degrees), which may or may not have anything to do with it. ALSO, i am a broke college student AND its christmas time… if i had the money to just start replacing things until the headlights worked WE WOULDNT HAVE A QUESTION NOW WOULD WE
    also, the hi-beams work as do the parking lights. my cabin light and also the illumination behind the letters on the gear shifter have been acting kind of fishy lately as well. both occasionally take some “fonzie-ing” as i call it, to come on. seriously. you give it one swift light hit they come on
    and btw i AM kind of testy. hah i was supposed to be leaving for 3 days in my home town this evening at 10PM which can’t really happen now that my car has no headlights. merrrry christmas to me.

    There are 6 Answers for "Why Would Both Headlights Go Out Simultaneously"

    1. Ray E says:

      Did you replace the bulbs and the fuses? if you did then you would know if its them or a malfunction wire…. you can’t just “look” at them…. geez people, common sense.

    2. Mikey says:

      An electrical link that supplies power to both headlights at the same time is at fault. Could be either the headlight switch that you turned on or the dimmer switch. I would vote for the dimmer switch being worn out.

    3. Lbhietala says:

      Headlight relay has died. The switch you turn in the car doesn’t handle that kind of power, it just turns on another switch under the hood. It’s probably in the fusebox with other stuff, a black plastic cube-looking deal. They aren’t expensive, and replacing is just pulling out the old and plugging in the new.

      [edit] You might find an el cheapo replacement at a pull-a-parts yard or junkyard. Good luck with that of course, it’s the kind of thing that gets pulled first, but you never know.

      Now here’s a thought – I’m assuming you already tried every possible switch position out there. That’s what I’d do. And if you’re getting no joy on low beams, high beams, ceiling beams, whatever, I’m pretty sure it’s the relay. So try this:

      Pull it. Take it inside for an hour or two and let it warm up. Then plug it in again. If your lights come on now, then your relay simply isn’t up to the challenge of extreme cold. A new one might not have the problem, or might not have it for a few years (like yours), and maybe there’s a different one you could order that was intended for colder climates.

      Barring that, and this is the broke college student solution, pull it every time you park, and take it inside. Plug it in every time you go to start the car. It’s extra hassle but hey, if I didn’t have any ideas WE WOULDN’T HAVE AN ANSWER NOW WOULD WE.

      Go easy on that all-caps stuff. It makes you look testy.

      [edit] Okay, if both high beams come on, then the switch itself is wonky. And of course, it’s possible the headlights themselves really have both died simultaneously. If you’ve got a meter, you can test for continuity across the low beam terminals. If resistance = infinity, the filament’s dead.

    4. Unksly says:

      Check the dimmer switch and then check the headlight switch itself. Now if still no lights, check the headlights relay!

      “BRILLIANT”!!!!

    5. Jesse S says:

      Put a voltmeter or test-light on a headlight connector to see if you have power at the headlight, if so then the bulbs burnt out; and yes, I have had 2 burn out simultaneously. If there is no power at the lamps trace the circuit back. Or, just try rapping on all of the relays with a screwdriver handle.

    6. Keithhernadez says:

      Its probably your switch that is out on them..check the relay for them and also fuses to make sure they arent blowing

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