Just came across this site and wandered into this area. Very funny because I just spent 45 minites trying to get the passenger low beam bulb out of my 2002 S60. I'm 6'2" and i'm very mechanically inclined, but this thing drove me nuts. First you need hands the size of a 5 year old to get behind the bulb area. Well, i got the cover off and then the problem i had is that I could not get the plug off of the bulb itself. I know it has the metal retaining clip, which was ok, but getting the plug off was not happening. I called my dealer and he said, "oh it's asy, just pull off the plug". No *%@% Sherlock!
He then said i need to squeeze the clips on the plug and then pull off. Well, i've seen many of these types of wiring harnesses and plugs, but could not find any piece to squeeze in. After 45 minutes I said to heck with this, and now i have to stop into the dealer for them to show me what he is talking about since i now have 52k miles on it and i want to be able to change my own stinking bulbs. Anyway, goo dluck to all!