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Seating -- Electric: Other Ford Focus III

Seats 3 illustrations ~975 words

Heated Seats

The heated seat control switch adjusts the driver or passenger seat to the desired heat setting: 0 through 5 (setting 0 is off, 1 is the lowest and 5 is the highest). Each heated seat control switch position sends a unique voltage signal to the associated driver or passenger heated seat module. The heated seat module supplies heater current to the seat cushion and backrest heater mats while monitoring input from a temperature sensor (part of the seat cushion heater mat) to maintain the desired seat temperature (setpoint) selected by the heated seat control switch. The approximate temperature setpoints for each heated seat control switch position are

  1. Position 1: 26°C (78.8° F)
  2. Position 2: 30° C (86° F)
  3. Position 3: 35° C (94.9° F)
  4. Position 4: 42° C (107.5° F)
  5. Position 5: 52° C (125.5° F)

Heated Seat Control Switch

The heated seat control switch receives voltage from the ignition relay, and contains two 6-position rotary (potentiometer) switches (one for driver side, the other for passenger side). The heated seat control switch supplies a voltage signal to the corresponding driver or passenger heated seat module based upon the selected switch positions. The resistance values for each switch position are

  1. Position 0 (open circuit)
  2. Position 1 (6, 849 - 8, 371 ohms)
  3. Position 2 (5, 724 - 6, 996 ohms)
  4. Position 3 (4, 599 - 5, 621 ohms)
  5. Position 4 (3, 474 - 4, 246 ohms)
  6. Position 5 (2, 584 - 2, 636 ohms)

Heated Seat Module

The heated seat module is part of the cushion heater mat assembly (includes heated seat module, cushion heater mat and associated wiring) and cannot be serviced separately. The driver/passenger heated seat module receives voltage from the accessory relay. When commanded by the heated seat control switch, the heated seat module monitors the cushion temperature sensor 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 heated seat module cycles the heater circuits on/off as required to maintain the setpoint temperature. The driver/passenger heated seat module has internal overtemperature detection. If the temperature exceeds 115° C (238.8° F), the heated seat module output is switched off. The system reactivates automatically after the temperature drops below 100° C (211.9° F).

Heater Mat

The heated seat module is part of the cushion heater mat assembly (includes heated seat module, cushion heater mat and associated wiring) and cannot be serviced separately. The backrest heater mat can be serviced separately from the cushion heater mat. The cushion and backrest heater mats are connected in parallel. The individual heater mat resistance values are

  1. Comfort seats - cushion (4.36 - 5.32 ohms), backrest (4.91 - 6 ohms)
  2. Sport seats (cloth) - cushion (4.6 - 5.63 ohms), backrest (4.6 - 5.63 ohms)
  3. Recaro seats (partial leather and leather) - cushion (4.14 - 4.73 ohms), backrest (5.9 - 7.21 ohms)

The cushion heater mat is equipped with a temperature sensor (thermistor) which provides feedback to the heated seat module. The minimum/maximum operating range of the temperature sensor is -40° C (-39.9° F) (269K ohms) to 120° C (247.8° F) (311 ohms).

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

The seat track contains 2 bi-directional motors which are integral to 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 Recliner Motor

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

The Heated Seat is Inoperative or Does Not Operate Correctly - Driver

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Possible Sources

  1. Fuse
  2. Wiring, terminals or connectors
  3. Heated seat control switch
  4. Heater mat

The Heated Seat is Inoperative or Does Not Operate Correctly - Passenger

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

  1. Fuse
  2. Wiring, terminals or connectors
  3. Heated seat control switch
  4. Heater mat

The Power Seat is Inoperative or Does Not Operate Correctly - Driver

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

  1. Fuse
  2. Wiring, terminals or connectors
  3. Seat control switch
  4. Seat backrest
  5. Seat track

The Heated Seats are Inoperative - Driver and Passenger

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

  1. Fuse
  2. Accessory Relay
  3. Wiring, terminals or connectors
  4. BCM

Front Seat Backrest Cover

Special Tool(s)/General Equipment

Hog Ring Plier

Scheme 78

Scheme 78: Removal
Scheme 78: Removal

Scheme 79

Scheme 79
Scheme 79

Scheme 80

Scheme 80
Scheme 80
  1. WARNING: Before beginning any service procedure, refer to Safety Warnings in «GENERAL INFORMATION -- FOCUS ELECTRIC»(ref-566930) . Failure to follow this instruction may result in serious personal injury. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(ref-566930-S09442017172013071700000) .
  2. Remove the seat. Refer to: «FRONT SEAT»(ref-566988-S08022497012013071700000) .
  3. NOTE: This step is only necessary when installing a new component. Remove the head restraint guide sleeves. Refer to: «FRONT HEAD RESTRAINT GUIDE SLEEVE»(ref-566988-S11643593852013071700000) .
  4. If equipped with adjustable manual lumber.
  5. All vehicles.
  6. All vehicles.
  7. Vehicles with cloth seats.
  8. NOTE: Use care when separating the seat backrest cover from the hook-and-loop strip, or the hook-and-loop strip may be torn from the seat backrest foam pad. All vehicles.
  9. All vehicles.
  10. Vehicles with cloth seats.
  11. NOTE: This step is only necessary when installing a new component. Vehicles with leather seats.
  12. Vehicles with Recaro seats.
  13. Vehicles with Recaro seats.

Front Seat Cushion Cover

Special Tool(s)/General Equipment

Hog Ring Plier

Front Seat Cushion Heater Mat

Special Tool(s)/General Equipment

Hog Ring Plier

Rear Seat Cushion Cover - Vehicles With: 60/40 Split Seat

Special Tool(s)/General Equipment

Hog Ring Plier

Rear Seat Backrest

Special Tool(s)/General Equipment

Hog Ring Plier

Rear Seat Cushion

Special Tool(s)/General Equipment

Hog Ring Plier

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