See also:

Deactivating HDC
Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

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

Socket for OBD Onboard Diagnosis
Position There is an OBD socket on the driver's side for checking the primary components in the vehicle emissions. Emissions ▷ The warning lamp lights up: Emissions are deteriorating ...