See also:

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

Parking lamps
Switch position     : the vehicle lamps light up on all sides, e.g., for parking. Do not use the parking lamps for extended periods; otherwise, the battery may become discharged ...

Switching the system on/off
Switching off At the lowest fan speed, press the left side of the button on the driver's side. Switching on Press any button. ...