Controlling system for unlocking and locking of doors of motor vehicle, has vehicle sided transmit-receiver for authentication communication which is actuated on detection of access- or locking-request generated by acoustic signal

摘要

System has a user sided portable ID-transmitter (10) and vehicle side transmit-receiver (20) for a radio-based authentication communication with the ID-transmitter. The authentication communication is started by sending a radio-start signal by a vehicle side transmit-receiver if an access- or locking-request is detected. An acoustic signal is generated as access- or locking-request. An acoustic sensor (40) is provided for detecting access- or locking-request at vehicle side.