Abstract: The vehicle-installed remote control unit includes a receiver receiving a command signal transmitted from a transmitter dedicated to a vehicle, and a controller controlling a part of the vehicle in accordance with the command signal received by the receiver. The controller has a noise-decision function of deciding whether or not a signal received by the receiver is a noise, a record function of recording noise information including at least information specifying a time at which the signal received by the receiver is decided to be the noise by the noise-decision function in a memory included in the controller, and an output function of outputting the noise information recorded in the memory to an external device in response to a command received from the external device.

Abstract: In a keyless entry system for a vehicle, an in-vehicle device controls door-lock or door-unlock according to a remote-controlling wireless signal from a transmitter. The in-vehicle device determines whether a demodulated signal compliant with a communications rule is obtained from the received wireless signal, and then whether authentication data included in the received wireless signal accords with that stored in the vehicle. The in-vehicle device stores a result of the determination as an analysis result of received electric waves. When a read-out request is received from a diagnosis tool, the stored analysis result is thereby outputted to the diagnosis tool. Based on the outputted analysis result, it is determined whether a cause of non-operation abnormality is a transmitting function of the transmitter or a receiving function of the in-vehicle device.

Abstract: The vehicle-installed remote control unit includes a receiver receiving a command signal transmitted from a transmitter dedicated to a vehicle, and a controller controlling a part of the vehicle in accordance with the command signal received by the receiver. The controller has a noise-decision function of deciding whether or not a signal received by the receiver is a noise, a record function of recording noise information including at least information specifying a time at which the signal received by the receiver is decided to be the noise by the noise-decision function in a memory included in the controller, and an output function of outputting the noise information recorded in the memory to an external device in response to a command received from the external device.