See also:

After the ignition is switched off
The roof can still be operated for approx. 1 minute, as long as no door has been opened. ...

Malfunction
A message is displayed in the instrument cluster. HDC is not available, e.g., due to elevated brake temperatures. ...

Example: dialing a phone number
1. Briefly press the button on the steering wheel. 2. ›Dial number‹ The system says: »Please say the number«. 3. For instance, ›123 456 790‹ The system says: »123 456 790. Continue?   ...