OK-Here's a question. Parked in the lot at the gym, car idling with the door open (sunny, dry day). Was leaning out, tying my shoes when I felt little shocks (VERY slight-like the kind from a 9-volt battery) every time my calves touched the black hard plastic part that covers the door sill. I looked closer and noticed what seems to be rubber weather stripping imbedded in there and that's what I was hitting and what was providing the current. I was never aware of this before and wonder what this is? There is definitely something live there-and in normal use you would never come into contact with it (unless you're in shorts leaning out tying your shoes). So what is it? The system that monitors 'door ajar'? Just curious-and do all Cadillacs have this built-in 'shock therapy' option? (BTW: '99 Deville Concours).