2. Functionality
The driver identification control unit is integrated into the Start/Stop button of the Keyless drive authorisation system (DAS) and identifies the driver when the Start button is pressed by way of the sensor integrated in the button. The fingerprint identification compares a fingerprint with one or more stored fingerprints. Since every person's fingerprint has characteristic features, a software program analyses whether the fingerprints match. For two fingerprints to be compared at all, at least 80% of the image areas under comparison must match. A very small number of people are unable to register because the fingerprint sensor is unable to produce usable images of their finger. Possible causes of this include very dry, cracked hands, and skin infections. Those people cannot use the fingerprint identification system.
Following successful identification of a user with terminal S on, the control unit issues a user ID via K-CAN on the basis of which the individual control units activate their user-specific settings and store changes in the course of a terminal 15 cycle. Starting of the vehicle is independent of the identification of the user. It is dependent on the presence of an authorised vehicle key in the vehicle interior.