The heated seats system for the driver and passenger seats consists of the following components:

The driver and front passenger seats are heated using electric heater elements located in the seat cushions and seat backs. The driver seat module (DSM) controls the voltage supply and the ground circuits to the driver and passenger seat heater elements. When a heated seat function is commanded active, the seat module will switch battery voltage to the heater element supply circuits and ground is provided through low side drive control circuits. During heated seat operation both the seat back and cushion heater elements are supplied battery voltage. The seat module grounds the appropriate control circuits for driver or passenger heated seat operation, and opens or closes the active control circuits, as necessary, in order to maintain the desired seat temperature. The heated seat switch and a heat sensor located in the seat cushion are connected in series and provide a single input to the DSM. A 5-volt reference voltage is supplied to the heated seat switch from the DSM. When the heated seat switch is in the high or low positions voltage is supplied through one of the internal resistors to the switch signal circuit. The heated seat switch signal circuit is grounded through the seat heat sensor which is a temperature sensitive variable resistor. The heated seat switch signal circuit input to the DSM is spliced from the circuit between the switch and the heat sensor, where the voltage level is determined by the resistance of both components. The passenger heated seat switch must be enabled through the seat belt switch in order for heated seat operation to occur.