I had the same problem behind your stereo there is a yellow wire whit a yellow-white wire they have to touch each other otherwise the low beams wont work.. i hope this wil work..
Relay K behind the ash tray. Check the socket also.
Al
This is the answer! We burned out the yellow white wire to the dimmer switch hooking up a radio. Reran that wire and hooked it up to the yellow white wire and now we have low beams. High beams would work (if you held in on the arm, parking lights worked, but not the low beams. Replaced the k fuse (after a 4 day wait) and still nothing. Tried this and it worked!-Thank you:-)