Abstract : 

A system and method accessing a vehicle using a wireless smart key device through the non-audible signal is disclosed. The system includes a communication unit in the vehicle and the electronic system in the wireless smart key device which does the entire operations for allowing the access. The communication unit includes a sensing unit, control unit, a speaker and a microphone. 

Communication unit is adapted to generate, send and receive tones, both the proximity tones and the user identification tones and to embed the tones with the required message. The method includes generating, sending, receiving, processing and authenticating the tones embedded with the message which utilizes the non audible communication. The system and method makes the accessing of the vehicle possible.