Heated Seats

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The heater mat on the front passenger seat cushion is not serviceable separately. If a new heater mat is needed on the front passenger seat cushion, a new occupant classification sensor (OCS) system service kit and a new heater mat must be installed. Refer to SUPPLEMENTAL RESTRAINT SYSTEM article.

NOTE: If a driver seat heater mat (cushion or backrest) or passenger seat backrest heater mat is faulty, a new foam pad must be installed with the new heater mat. Do not reuse the original foam pad.

Vehicles equipped with front heated seats have a heated seat module located under each front seat. The driver and passenger heated seat modules share a common battery voltage feed circuit and a common ignition voltage feed circuit. When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on either the high or low enable circuits to command the system ON or OFF in HI or LOW, respectively. The heated seat module also will ground the respective HI or LOW indicator circuit at the heated seat switch, providing a voltage path to indicate an ON state by illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats which are connected in parallel and operate together. Temperature is maintained by the heated seat module monitoring a temperature sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor and monitors the return signal for adjusting the current flow to the heater mat circuits. The heated seat module is designed to remain ON, heating the seat and maintaining temperature until switched OFF or the time-out period occurs. If the ignition voltage source is removed, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The temperature sensor is not serviceable separately, a new sensor must be installed as part of the cushion heater mat or foam pad.