Seat Heater Mat
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Each seat backrest 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.