Seat Heater Mat
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Each seat cushion heater mat is equipped with a temperature sensor (thermistor) which provides feedback to the heated seat module. The heater mats are serviced by installing a new backrest or cushion foam. The cushion and backrest heater mats are connected in series.