Abstract: An electric heating device for a vehicle may comprise: a switch element configured to allow an electric current to flow through an electric heater; a switch element control unit generating a switch element control signal and a switch element drive signal; and a switch element drive unit driving the switch element with the switch element drive signal. The switch element control unit generates a new switch element control signal based on a switch element function diagnosis signal for diagnosing an abnormality in the switch element or in the switch element drive unit and on a switch element functional abnormality detection signal that includes an indication of a presence or an absence of the abnormality. The switch element control unit generates a new switch element drive signal based on the new switch element control signal and on the switch element function diagnosis signal.

Abstract: An air conditioner for a vehicle includes a body which has a suction port including an inside air inlet and an outside air inlet and a blowout port, an intake door configured to close one of the inside air inlet and the outside air inlet, a fan configured to take inside or outside air from the suction port to send the taken inside or outside air through the blowout port to a vehicle room as an air-conditioned air, a component emitting device, the component emitting device generating and emitting air including a desired component in the body while the fan is driven to send the desired air to the vehicle room with the air-conditioned air, and a control device configured to close the outlet air inlet by the intake door while the component emitting device generates the desired component.