See also:

Switching on/off directly
1. "Settings" 2. "Climate" 3. "Activate parked-car vent." The symbol on the automatic climate control flashes if the system is switched on. ...

Closing the windows and glass sunroof/panoramic glass sunroof
Driving with the glass sunroof/panoramic glass sunroof and windows open results in increased air resistance and raises fuel consumption. ...

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