2004 jetta headlights going out when switching low/high beams

Some ideas here. It may be an issue in the headlights control module.

https://www.google.com/search?q=2014+VW+Jetta+TDI%3B+low+beams+stopped+working

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it can be ure headlight switch that is faulty,try to get one to test it

Sounds like the low/high beam relay switch is not functioning properly. The relay should turn both high and low beams off when the ignition is turned off.

check fuse and if thats not problem then see if power u have power at switch if u do then switch is bad

Check the headlight relay.

I have a 1993 vw jetta and the headlights don't work. I replaced the bulbs and that didn't work. The switch works. what could be the problem?

first check the wire make sure low beam power is there if there is power check your low beam fuse if fuse is good check the rely and if that good check head light module make its putting out power and if all that is goo then change you bulb it may be a double filament buld and the low beam side is blown

The problem is in the high beam switch assembly which also houses your turn signals and possibly cruise control, and yes, I'm sure. There are some electrical contacts in the assembly which dis-connect the low beams when you put the high beams on. Constant use of the high beam switch will create arcing on the low beam switch which makes the contacts not conduct electricity anymore. The daytime running lights send power to the low beams on a separate circuit. .

The repair is to either replace the assembly, $300 at dealer, $100 or less do it yourself, or take the assembly apart and clean it for free. (2 hours or less)

Instructions on taking your steering wheel off here: http://forums.tdiclub.com/showthread.php?t=151557

Instructions for fixing the switch here: http://forums.tdiclub.com/showthread.php?t=167831&page=4

P.S. If you own a VW, especially around model years 1999 to 2004, there is a rare but devastating problem with engine coolant being literally pumped through all electrical parts of your car.... destroying it. Repair cost = $8,000. It is called coolant migration. Check your VW right now (takes two seconds, literally), and do a two-minute procedure to fix your car to prevent the problem here: http://www.myturbodiesel.com/1000q/multi/coolant_migration.htm

https://s12.postimg.org/6o2zcv3hp/jetta_headlamps.jpg

Click on the link.
This is for 03 jetta gls
There are fuses for left and right low beams. Headlights on low beam, use a test light, see if voltage on fuse circuit? If no voltage that will lead us back to dimmer switch or problem with wiring circuit from dimmer switch.

the headlight fuses are always the first four going from left to righ on a volkswagen 1 for left lowbeam rigth low beam left high beam right high beam.