Hello.
I've read all the posts here and elsewhere(or a lot of them) about this issue. I have checked all the fuses, replaced the headlight switch, and tried to locate the "low beam cut relay". I've replaced the relays in the underhood fuse box.
My question is: Where in the world is the low beam cut relay"? I've seen the pictures, pretty much removed most of my lower dash, and cannot find it in the location listed. I do Not have DRLs. Is the cut relay only used with DRLs?
I'm at the point to start tracing wires. Very frustrating.
Any help would be appreciated.
Thanks
jeff
2003 Honda Civic LX

Has your car had the recall(s) done yet?
(see recall links in signature below)

If the high beams DO work, the relays and fuses are fine.
Relays supply positive to the bulbs.....

headlight switch controls the ground to each side of each bulb, no relays involved in this section.

The dash fusebox is the common junction point for the harnesses involved

So... just double checking because you didn't mention this in your initial post.. Did you check the filaments in the bulbs? H4's are dual filament: one for low beams, one for high beams. There's a chance that the low beam filament could be out but the high beams still in tact.

All,
Thanks for all the responses. I did pull the bulbs and look at each one, and they looked fine, as far as I could tell. They were the *only* thing, other than tracking wires, that I hadn't replaced.
With the chance of being a loony that just likes to do a lot of work for the hell of it, I broke down and bought 2 bulbs. I replaced them and everything worked. I just couldn't believe they would both go out at the same time, and reading all the assorted forums on the net led me to believe the worse.
So, lesson learned. I have about 50 bucks into this and about 3 hours. Took me 5 minutes to change the bulbs.
Again, thanks for the help. I will try to be a bit more intelligent the next time around...
jeff

What I've done in the past to verify bulbs working (also, always start at the cheapest thing to fix, at least testing-wise) is connect leads directly to the bulb prongs to test functionality. 2001-2003 civics are ground switching lights with a common +12vdc. Chances are there was a minimal break in the low beam filament

I had a car that burned out headlights within ONE DAY of each other. They were the exact same age and had the exact same amount of time being on, and all that.

I've had other cars that burned headlights within several days of each other.
Same for customers cars....that's why we always try to sell headlight bulbs in pairs at the shop

Almost a certainty the 2nd follows quickly. They draw considerable current so when one fails the voltage goes up on the 2nd light. Mine did the same thing failed the next night after the first one did.