Motor vehicle heated seat control

摘要

A control for a resistive heating element embedded within a motor vehicle seat is disclosed. In one embodiment, a transistor is biased into conduction to energize the heating element when the temperature of the element is below a threshold that is adjusted by the vehicle operator. A fault sensing system monitors operation of the control unit and de-energizes the heating element if a fault is sensed. Sensed faults include both short circuits and undesirable open circuits. Power application to the resistive heating unit can be either pulsed or continuous. In one embodiment, once a fault is detected, the heating system cannot be re-energized until the vehicle ignition switch is turned off and then returned to its on position.