Heater Mat
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The cushion heater mats are each equipped with a temperature sensor (thermistor) which provides feedback to the FCIM (heated seats only) or SCME (heated/ventilated seats). The cushion and backrest heater mats are connected in series.