WHILE DRIVING, A SMELL OF BURNING MATTER RAPIDLY INCREASED IN THE CAR, THEN IMMEDIATELY FOLLOWED BY A SHARP BURNING SENSATION IN MY LEFT THIGH. I STOPPED THE CAR, GARBED MY EXTINGUISHER AND LOOKED AROUND THE SEAT FOR ANY SIGNS OF FIRE. THEN I NOTICED A BLACK BURNED HOLE ON THE SEAT BOTTOM LEFT BOLSTER EXACTLY WHERE MY THIGH BURNED. IT SEEMED THAT THE SEAT WARMER OVERHEATED, AND BURNED A HOLE IN THE LEATHER. TURNING ON THE CAR AND WARMER AGAIN FOR COUPLE SECONDS, RESULTED IN SPARKS APPEARING THROUGH THE HOLE. I CONTACTED BMW OF NORTH AMERICA, AND THEY INFORMED ME THAT THE CAR IS NOT COVERED BY A WARRANTY ANYMORE, AND THAT THERE WAS NO RECALLS RELATED TO THE SEATS ISSUED FOR MY CAR. TO CONTACT MY BMW DEALERSHIP FOR REPAIRS. THAT I WOULD BE RESPONSIBLE FOR THE DIAGNOSTIC FEE AND THAT THEY MIGHT COVER A PORTION OF THE REPAIRS. CHECKING SIMILAR COMPLAINTS ON NHTSA, I AM SURPRISED BMW HAS NOT ISSUED A RECALL FOR THE SEAT HEATERS FOR OUR CARS, SPECIALLY SINCE IT IS A SERIOUS SAFETY ISSUE. *TR