TURNED ON THE SEAT HEATER. SEAT STARTED TO FEEL QUITE WARM, THEN I SMELLED SMOKE. PROMPTLY TURNED OFF SEAT HEATER AND LOOKED AT THE SEAT. WHEN I LOOKED DOWN I SAW A SMALL BURN HOLE IN THE SEAT. RECEIVED A MINOR BURN ON MY BUTT. GLAD I WAS NOT YET ON THE HIGHWAY. *NM