See also:

For better control
The indicator lamp flashes: DTC controls the drive forces and brake forces. The indicator lamp lights up: DSC and DTC has failed. DTC activated: The indicator lamp lights up and TRACTION ...

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

Switching the interior lamps on and off
Press the button. To switch off permanently: press the button for approx. 3 seconds. Switch back on: press button. ...