I've got an 05 Touran, and no probs.- I would have thought that the marker lights would have been on the same circuit as the "tail" lights.The Touran beeps 5 or 6 times inside when you start up without the seatbelt on-have you tried it with the seatbelt fastened, just in case it's coincidental?
Just about to head off for the w/e - hope you manage to get it sorted.