A key-less entry system including a transmitter for transmitting a door lock signal, and a vehicle onboard unit for executing a door automatic lock by detecting that a driver side door has made a transition from an open state to a closed state after reception of the lock signal. Accordingly, once the...http://www.google.com/patents/US7301437?utm_source=gb-gplus-sharePatent US7301437 - Key-less entry system
