I had the same problem last year. The site listed below will explain in detail how to change the light. It also has photos so it is pretty simple. Took me about 15 mins. Remember not to touch the halogen headlilght with your fingers. Use gloves. http://www.mohea.com/mike/words/000735.html
how to change a headlight on a 2003 passat
How do I change headlamp on 2006 Lincoln Town Car
i have a volkswagen passat 2006 the mirror indicators gone how can i change it please?
You can't change it. The daytime changes automatically.
http://www.tobio.info/passat/howtos/passat_air_filter.html
very carefully !! Read your owners manual and do it very carefully -those bulbs are VERY very cheap if broken !!
http://www.tobio.info/passat/howtos/passat_air_filter.html
how do I remove a tire from a VW 2003 Passat
Remove the wiring harness from the back of your 1999 Chevy Astro headlamp. Remove the headlamp retaining bolts. The headlamp will come out. Reverse the process to install the new headlamp.
http://www.tobio.info/passat/howtos/passat_air_filter.html
There is a white plastic box located under the passenger side headlamp (useful !!). The fuse can be found there. You will need to remove the front grill and the headlamp has three bolts securing it and not 2 as I found out the hard way. The first 2 are located in clear view on top of the headlamp. The third is hidden underneath. I did not work out how to get to it as I didn't know it was there and broke the bracket wiggling the headlamp. Hope this helps.
http://www.tobio.info/passat/howtos/passat_air_filter.html