Hello. I need help figuring out what is wrong with the passenger side Xenon headlight on my '04 Touareg, which is not powering on unless I have it on high beam. The bulb itself is fine, but don't know what else is going on with it. Anybody else with experience in this issue? The mechanic I took it to said that it might be the ballast, but don't want to dish out money unless I know FOR SURE what is causing the issue. Please help with this! 
