Heated Seats

WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

The driver and passenger heated seat control buttons and indicators are located on the touchscreen interface (FDIM ). The FDIM is mounted directly to the APIM . The heated seat system functions independently of the vehicle's climate control system. Each time the heated seat button is pressed, the APIM sends the request to the FCIM using the I-CAN . The FCIM sends the message to the IPC using the I-CAN . The IPC sends the request message to the BCM over the HS-CAN . Finally, the BCM sends the request to the HVAC module which decreases one setting (the sequence is high, low, off, high, etc.).

When activated, the HVAC module supplies voltage to the selected seat's heater circuit. Each seat's cushion heater mat and backrest heater mat is connected in a series circuit to the HVAC module and powered by the output circuit for that seat. The HVAC module monitors inputs from a temperature sensor located in each seat's 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 HVAC module OFF or the ignition is set to OFF.

If a fault is detected by the HVAC module, 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.