The key code number is part of the key ID. As there can only be a maximum of 10 keys per vehicle, key numbers 1 to 10 are stored in CAS. Key code numbers cannot be changed. The key code number is transferred to CAS when the remote control is used. When the key is in the ignition, CAS reads the key number directly from the transponder (memory) in the key. Each key code number occurs only once in CAS. If required, a key can be blocked in CAS by using the key code number. The function block/release remote control/key is used for this.
Personalisation numbers are required to read the Key Memory settings in the vehicle. When unlocking using the remote control, the remote control sends the personalisation number to CAS. CAS forwards the number to the other control units via the data busses. The control units then perform the settings saved in the Key Memory. A total of three different Key Memory settings are coded into each control unit. This means that the personalisation number can have a value from 1 to 3.