Heater Mat
WARNING: This page is about a different car, the 2017 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
If equipped with heated seats, the cushion heater mats are each equipped with a temperature sensor (thermistor) which provides feedback to the FCIM. The heater mats are serviced by installing a new backrest/cushion foam. The cushion and backrest heater mats are connected in series.