TL* THE CONTACT OWNS A 2007 MERCEDES BENZ ML350. WHILE DRIVING APPROXIMATELY 30 MPH AND ACTIVATING THE SEAT WARMER, THE LEFT SIDE OF THE DRIVER SEAT WAS EXTREMELY HOT AND BURNED THE CONTACT'S SHIRT AND LEFT ARM. MEDICAL ATTENTION WAS NOT RECEIVED. THE CONTACT NOTICED THAT THERE WAS SMOKE EMITTING FROM THE DRIVER SEAT AND TURNED OFF THE SEAT WARMER. THE FAILURE BURNED THE LOWER LEFT SIDE OF THE DRIVER SEAT. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 87,653.