See also:

Activating HDC
Press the button; the LED above the button lights up. ...

Manual transmission
Switching off the engine 1. With the vehicle at a standstill, press the Start/Stop button. 2. Shift into first gear or reverse. 3. Set the parking brake. ...

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