Device for locking and unlocking a motor vehicle door

摘要

A vehicle mounted transmitter(s) initiates a control unit (SG) to unlock the door on receipt of an access authorization code signal from a transponder (T). A further authorization code signal is required to enable the car to be driven away for which an additional memory (SP) is provided on the car. This is programmed to meet unusual conditions, e.g. children playing with the transponder during a journey.