Rear Heated Seats

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

The heated seats are controlled by the heated seat module located under the RH seat cushion. When the heated seat switch is pressed, a momentary ground signal is sent to the heated seat module. When the heated seat feature is active, the heated seat module supplies voltage to the heater circuit. The seat cushion and backrest heater mats are wired in series. The heated seat module monitors input from a temperature sensor, located in each backrest heater mat and maintains seat temperature by cycling output voltage to the heater grids as necessary to maintain the set point temperature. The heated seat module supplies voltage to the auxiliary climate control assembly to illuminate the appropriate indicator circuit(s) in the heated seat switch when the system is active. In high mode, both indicators on the heated seat switch illuminate. In low mode, only the low indicator illuminates. The heated seat module does not time out and remains on until switched off or ignition is off.

The heated seat module does not report Diagnostic Trouble Codes (DTCs) and does not communicate on any network. If a fault is detected, the affected seat system is disabled. The faults detected are:

a heater feed circuit short to battery, ground or open.
sensor circuit short to battery or open.
heated seat switch stuck closed to ground.

After the fault is corrected, the heated seat module needs to be reset by cycling the ignition OFF and then ON. After the heated seat module has been reset, the module returns to an off state.