The contact owns a 2017 Ford F-150. The contact stated that while her husband was driving 5 MPH out of the driveway, there was an abnormal burning odor coming from the vehicle. There were no warning lights illuminated. The contact’s husband then heard an abnormal sound coming from the vehicle, and the rear window cracked. The contact called an independent mechanic and was informed that the defroster had heated up and cracked the rear window. The vehicle was not diagnosed by an independent mechanic or the dealer. The local dealer was contacted; however, the vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 120,000.