TL* THE CONTACT OWNS A 2010 FORD F-150. WHILE ATTEMPTING TO START THE VEHICLE, THE REAR DEFROSTER WAS ACTIVATED AND THE REAR WINDOW SHATTERED. THE PASSENGER SIDE FIXED SECTION SHATTERED BECAUSE OF THE FAILURE OF THE DEFROSTER. THE CONTACT HAD ALSO NOTICED THAT THE DEFROSTER WIRES WERE BURNED AND WERE HEATED, WHICH CAUSED THE GLASS TO SHATTER. THE FAILURE RECURRED MULTIPLE TIMES. THE VEHICLE WAS NOT TAKEN TO A MECHANIC; HOWEVER, THE WINDOW WAS REPLACED MULTIPLE TIMES. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE MULTIPLE TIMES. THE APPROXIMATE FAILURE MILEAGE WAS 34,000.