2007 BMW X3 Sav electrical system problems

Turned on heated seat on driver's side. After approximately 2 minutes, felt burning on left side of seat. Turned off the heated seat, turned on the light and the seat was smoking substantially. A small hole was burned through the leather seat (about the size of a dime) and through my pants. I have a small red mark on the top of the back of my leg. The vehicle smells like smoke. Luckily, I was in the driveway when this happened or an accident might have occurred. Very concerning and will likely be a costly repair.

BMW x3 needs new computer system due to water damage allegedly emanating from a clogged drain in the sunroof. New computer costs appx $2,000. Dealer and BMW say the drain can't be seen or accessed by owner and it isn't cleaned as part of any servicing. Clear design flaw. I know of others who have had the same situation and bmws response is to try and file an insurance claim.