See also:

Problems with PARKTRONIC
...

Operating the on-board computer
The on-board computer is activated as soon as you turn the SmartKey to position 2 in the ignition lock. You can control the multifunction display and the settings in the on-board computer using ...

Switching on DISTRONIC, storing andmaintaining the current speed
WARNING   The vehicle can be braked when DISTRONIC is activated. For this reason, deactivate DISTRONIC if the vehicle is to be set in motion by other means (e.g. in a car wash or by tow ...