Principles of Operation

PRINCIPLES OF OPERATION

Power Seats
The 6-way power seat feature moves the seat in 6 possible directions: the base of the seat can be moved forward or rearward and the front and back of the seat cushion can be moved up and down independently. The power seat feature operates independent of the position of the ignition.

The power seat motors are hardwired to the seat control switch. The circuits are normally at ground through the seat control switch. An individual circuit is switched to power when a specific adjustment position is selected.

Heated Seats
The driver and passenger heated seats share a common battery feed to the heated seat relay junction box. The ignition circuit powers the logic board and illumination of the heated seat switches located internal to the electronic manual temperature control assembly (EMTC). The battery feed is used to provide voltage to the heater mats.

There are 2 power supplies to the heated seat relay. One power supply energizes the relay and heated switch LED when the key is in the RUN position and the heated seat switch is activated. This closes the relay and power is provided to the heated seat elements through the other power circuit. The heated seat module will remain ON until the heated seat switch button is depressed to cycle the heated seat module OFF or a 10-minute time-out period occurs. If ignition power is switched OFF, the heated seat module will enter an OFF state.

The driver seat cushion and backrest heater elements are wired in series as are the passenger seat cushion and backrest heater elements. The heated seat system is designed to maintain the temperature by the opening (no voltage to the heated seat mats) and closing (voltage supplied to the heated seat mats) of the bi-metallic thermostat.