Circuit/System Description

The driver and front passenger heated seat heating elements are controlled by a common high current relay internal to the seat heating control module and the low side by individual element control circuits. The seat heating control module connects the heated seat heater element supply voltage circuits for both seats to a common reference point. This reference point is biased to approximately 2.0 V. Before the control module will allow heated seat operation, it checks to see if this reference voltage is shorted to ground or battery voltage. Once the control module verifies that it is not closing to a shorted heating element, it allows heated seat operation. After which it continues to monitor for a shorted circuit.