Side marker and full(high) beam working fine, but not dipped (low beam) headlights. Checked all fuses - ok. I looked at the cover of the fuse box above (pic below).

enter image description here Honda Accord 2005 under-bonnet fuse box Lid

Which covers these fuses & relays: enter image description here

The relays you can see only indicate fan controls, frost (!) and heating. Headlights are only shown in fuses F1,3,5 & 6 and as they are all fine I'm stumped what is causing the dipped main beam not to work. So I had someone switch the lights on and off from side to dipped main and a relay was clicking. Using feel I found the sound and vibration coming from the apparently sealed boxed section on the right of the bottom picture. After much wrangling, this covered portion of the fuse-box does not feel user-accessible even to replace a headlight faulty relay.

Q. IS the headlight relay inside this covered/almost sealed right side of the fuse box? If so how do you get to it?

(Bulbs are fine).

Thanks J

  • According to my factory service manual, the relay is either in that box or that box is some kind of all-in-one inclusive relay. The manual does not give any details as to how to replace that part or diagnose a bad relay, at least not that I can find.
    – zhang
    Jul 27, 2015 at 23:04

1 Answer 1


The headlight control unit is in the sealed portion of the box.

It is a CAN network controller and not just a relay.

If it has failed the whole box is to be replaced.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.