See also:

External temperature
External temperature warning If the display drops to +37 ℉/ +3 ℃, a signal sounds. A Check Control message is displayed. There is the increased danger of ice. Ice on roads Even ...

Activation/deactivation
Press the button. ...

Automatic deactivation during forward travel
The system switches off when a certain driving distance or speed is exceeded. Switch the system back on if necessary. ...