Abstract: A vehicle includes a multifunction receiver that receives signals from a wireless key system and a tire pressure monitoring system. When a power supply of the vehicle is activated and the vehicle is traveling or stopped, the multifunction receiver is set to receive signals from the tire pressure monitoring system. When the power supply of the vehicle is deactivated, the multifunction receiver is set to receive signals from the wireless key system regardless of the travel state of the vehicle.

Abstract: A valve identification information registration system includes a door sensor that detects an open vehicle door. A transmitter is arranged in a vehicle to transmit a tire valve activation signal when the door sensor detects the open door. A tire valve is attached to a vehicle tire and activated by the tire valve activation signal that emanates from the vehicle from the open door and transmits a response signal including identification information. A registration control circuit receives the response signal from the tire valve and registers the identification information of the tire valve included in the received wireless response signal in association with a tire location corresponding to the detection of the door sensor.

Abstract: An anti-theft apparatus including a first memory, which stores an ID code registered in a portable device, a GPS receiver, which determines the present position of the vehicle, a second memory, which stores a predetermined registered position, and a control circuit, which enables registration of the ID code to the first memory when the present position of the vehicle matches the registered position stored in the second memory.

Abstract: An electronic key system has a portable apparatus, an operation control device and an update control device. The portable apparatus selectively transmits a first signal and a second signal. The operation control device authorizes an operation of a key based on reception of the first signal. The update control device transmits an update signal in a private region of the owner of the portable apparatus. The portable apparatus has a counter and a portable apparatus controller. When receiving the update signal, the portable apparatus controller resets the counter. When the counting value of the counter is equal to or less than a predetermined limit value, the controller selects the first signal as a signal to be transmitted. When the counting value is in excess of the limit value, the controller selects the second signal as a signal to be transmitted.

Abstract: An anti-theft apparatus including a first memory, which stores an ID code registered in a portable device, a GPS receiver, which determines the present position of the vehicle, a second memory, which stores a predetermined registered position, and a control circuit, which enables registration of the ID code to the first memory when the present position of the vehicle matches the registered position stored in the second memory.

Abstract: An electronic key system has a portable apparatus, an operation control device and an update control device. The portable apparatus selectively transmits a first signal and a second signal. The operation control device authorizes an operation of a key based on reception of the first signal. The update control device transmits an update signal in a private region of the owner of the portable apparatus. The portable apparatus has a counter and a portable apparatus controller. When receiving the update signal, the portable apparatus controller resets the counter. When the counting value of the counter is equal to or less than a predetermined limit value, the controller selects the first signal as a signal to be transmitted. When the counting value is in excess of the limit value, the controller selects the second signal as a signal to be transmitted.