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both LOW BEAMS (you make this so hard not saying that...)
but challenging.....
is car in canada, or usa? or a?
does car have DRL. we dont know ,until you say.
and both types work different, non- and DRL.
my answer (roll dice, ) USA. no DRL
the system is simple (alldata.com)
2 fues, left and right
2 relays, one left, one right.
1 controller box.
1 switch combo.
the sequence of events
HL switch on,
this ground the Low pin on the mutiplex control box in fuse box.
this box sends 2 ground signals to both relays.
so if one headlight works you know the mpx box works
both relays close
and 12v is sent to both low beams , and there other side is grounded full time so they glow.
there are 2 fuse left and right. fuse #15 and 17
Check up dipped beam headlights fuse inside fuse box. For Audi A4 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram. If the dipped beam headlights fuse is OK, check up dipped beam headlights bulbs.
yes there is only one bulb but it has both high and low beam built into it you will have to take the bulb out and get a new one and when you put the new one in DONT TOUCH THE GLASS OF THE BULB
assume you have checked bulbs and are ok? check /try a new realay for dipped beam location is normally in engine bay box ? check your h/book for location ?
look in the o/m for a relay in the fuse panel that controls the headlights it's not a fuse its a little silver box about the size of the search box on this page sometimes these will go bad and cause the headlights to cycle
I've been troubleshooting this same problem on a different vehicle this week, and I can give you the steps I'd take.
1. If both sides went out at the same time, the problem is *NOT* likely to be the bulbs.
2. Check the fuses to see if both low beam lights are on the same fuse. Many cars have one fuse for low beam and another for high beam, so both lights out at the same time typically means fuse blown.
3. If the headlights are OK and the fuses are OK, then the problem is *LIKELY* the headlight switch. In my case, AutoZone has one and it can be installed easily; but in your case, that may not be as simple.
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