Key apparatus for vehicle, method of controlling starting of vehicle engine, and key system for vehicle

摘要

A key for a vehicle is provided with a transmitting circuit and an electric power receiving/signal transmitting circuit. The transmitting circuit transmits a wireless SW signal by radio waves in a case in which an instruction switch is on. The electric power receiving/signal transmitting circuit receives electric power from an electric power transmitting circuit provided in a key cylinder for a vehicle at a vehicle, and transmits a transponder code signal in a case in which the electric power receiving/signal transmitting circuit receives the electric power. When the key for a vehicle is inserted in the key cylinder for a vehicle, a light emitting device provided in the key cylinder for a vehicle emits light. In a case in which a receiver provided at the transmitting circuit receives the light, transmission of the wireless SW signal is prohibited.