See also:

Problems with the cooling with air dehumidification function
When you press the button, the indicator lamp in the button flashes three times or remains off. You can no longer switch on the cooling with air dehumidification function. X Consult a qualified ...

Activating/deactivating
WARNING Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. The rear window defroster ...

The windshield wipers are inoperative
The windshield wiper drive is malfunctioning. Select another wiper speed on the combination switch. Have the windshield wipers checked at a qualified specialist workshop. ...