Door lock heater? I knew there was some sort of heated locks on an M6, but does a 635 have them as well? Please explain. Please forgive my ignorance, I've only had this car a couple of months. My only other BMW was a 2002. I check this board probably 10 times a day to learn as much as I can. This is by far the most complex car I've ever owned, and I don't have an owners manual. Thanks for your help! John H.