Heated Seat Operation

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.

The driver and passenger heated seat buttons are selected from the FCIM and FDIM (touchscreen). The heated seat system functions independently of the vehicle's climate control system. Each time the heated seat button is pressed, the system decreases one setting (the sequence is high, med, low, off, high, etc.).

When activated, the FCIM supplies voltage to the selected seat heater circuit. Each seat cushion heater mat and backrest heater mat is connected in a series circuit to the FCIM and powered by the output circuit for that seat. The FCIM monitors inputs from a temperature sensor located in each seat cushion heater mat, and maintains seat temperature by cycling the heater circuits on/off. The heated seat remains ON until the heated seat switch button is pressed to cycle the FCIM OFF or the ignition is set to OFF.

If a fault is detected by the FCIM, the module stops supplying voltage to that individual left or right seat that the fault was detected on until the ignition is turned OFF and then ON.