The driver and front passenger heated seats each consist of the following components.

The driver door module (DDM), passenger door module (PDM), and the rear integration module (RIM) are also involved in the operation of the heated seats.

Battery positive voltage is supplied to both front heated seat modules from the rear fuse block IGN 3 Fuse. This allows the heated seats to operate only when the ignition in the ON position. Battery positive voltage is also supplied at all times to the heated seat modules from the rear fuse block; HTDST LF Fuse for the left heated seat module, or, HTDST RF for the right heated seat module. Both modules are grounded through the module ground circuits to G301.

The heated seat system is designed in order to warm the seat cushion and seat back to approximately 42°C (107.6°F) when in the high heat position, and 37°C (98.6°F) when in the low heat position. The heated seat module monitors the seat temperature through the temperature sensor signal circuit and the temperature sensor (thermistor) that is located in the seat cushion. The temperature sensor is a variable resistor, it's resistance changes as the temperature of the seat changes. When the temperature sensor resistance indicates to the heated seat module that the seat has reached the desired temperature, the module opens the ground path of the seat heating elements through the heated seat element control circuit. The module will then cycle the element control circuit open and closed in order to maintain the desired temperature.

The driver and passenger heated seats are controlled by separate heated seat switches. Both heated seat switches are grounded through a ground circuit provided by the associated door control module. When the heated seat switch is pressed, the heated seat switch signal circuit of the door control module is momentarily grounded indicating either a high, low, or heat off command.

When the driver heated seat switch is pressed, the driver door module (DDM) sends a class 2 message to the rear integration module (RIM) indicating the driver heated seat command. In response to this signal, the RIM momentarily sends a one shot pulse signal that is pulled low through the heated seat high/low signal circuit to the heated seat module. The heated seat module then applies or removes battery positive voltage through the element supply voltage circuit to the seat heating elements.

When the passenger heated seat switch is pressed, the passenger door module (PDM) sends a simple bus interface (SBI) message to the DDM indicating the passenger heated seat command. The DDM then sends a class 2 message to the RIM indicating the passenger heated seat command. In response to this signal, the RIM momentarily sends a 35 millisecond one shot pulse signal that is pulled low through the heated seat high/low signal circuit to the heated seat module. The heated seat module then applies or removes battery positive voltage through the element supply voltage circuit to the seat heating elements.

When the heated seat is off and the heated seat switch is pressed once, the heated seat module will set the heated seat temperature to high heat. The door module then applies battery positive voltage through the high temperature indicator control circuit to the heated seat switch illuminating the high temperature indicator. When pressed again, the heated seat temperature is then set to low heat and the door module applies battery positive voltage through the low temperature indicator control circuit to the heated seat switch illuminating the low temperature indicator. After a third press of the heated seat switch, the door module removes battery positive voltage from the heated seat switch low temperature indicator, and the heated seat module removes the battery voltage from the seat heating elements. The heated seat module will also turn off the heated seats whenever the ignition switch has been turned to the OFF position.

The ON/OFF status of the heated seats is reported to the RIM through the status output signal circuit of each heated seat module. During Load Shed Level 1, the RIM recognizes the heated seat status signal as active, and will cycle the heated seat operation 16.0 seconds ON and 4.0 seconds OFF. During Load Shed Level 2, the RIM will signal the heated seat module to deactivate the heated seat operation, and the door modules will turn off the appropriate heated seat switch temperature indicators.