Component Description

Seating - Heated

Component Description

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:
- Position 0 (open circuit)
- Position 1 (6,849 - 8,371 ohms)
- Position 2 (5,724 - 6,996 ohms)
- Position 3 (4,599 - 5,621 ohms)
- Position 4 (3,474 - 4,246 ohms)
- 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:
- comfort seats - cushion (4.36- 5.32 ohms), backrest (4.91- 6 ohms)
- sport seats - cushion (4.6- 5.63 ohms), backrest (4.6- 5.63 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).