Ford Ecosport: Front Seats / Description and Operation - Front Seats - System Operation and Component Description

System Operation

Heated Seats

The driver and passenger heated seat control buttons and indicators are located on the HVAC module. The heated seat system functions independently from the climate control system. Each time the heated seat button is pressed, the HVAC module decreases one setting (the sequence is high, medium, low, off, high, etc.). When a heated seat is set to high, all 3 LED indicators above that heated seat's control button illuminate. When a heated seat is set to medium, only two LED indicators above that switch illuminate. When a heated seat is set to low, only one LED indicator above that switch illuminates. When off, no indicators illuminate.

When activated, the HVAC module monitors inputs from a temperature sensor located in each seat cushion heater mat, and maintains seat temperature by cycling the heater circuits on/off. Each seat 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 heated seat remains ON until the heated seat switch is pressed or the ignition is set to OFF.

Component Description

Seat Control Switch

The seat control switch contains normally closed contacts (which are grounded). When a specific adjustment position is selected, an individual circuit is switched to voltage.

Seat Track

There are 2 front seat track bi-directional motors present on the power seat track. The horizontal (fore/aft) and height (rear up/down) motors are serviced as part of the seat track assembly. The seat track motors move the power seat forward/backward and up/down depending on the polarity of voltage supplied from the seat control switch.

Seat Backrest

The seat backrest contains a bi-directional recliner motor which is integral to the seat backrest assembly. The seat backrest motor moves the seat backrest forward/backward depending on the polarity of voltage supplied from the seat control switch.

HVAC Module

The heated seat control switches are part of the HVAC module. The HVAC module monitors the seat cushion temperature sensors and supplies heater current to the seat cushion and backrest heater mats until the desired setpoint temperature is reached. Once the setpoint temperature is reached, the HVAC module cycles the heater circuits on/off as required to maintain the setpoint temperature.

Backrest Heater Mat

The cushion and backrest heater mats are connected in series.

Cushion Heater Mat

The seat cushion heater mat is equipped with a temperature sensor (thermistor) which provides feedback to the heated seat module. The cushion and backrest heater mats are connected in series.