See also:

Problems with the rear window defroster
The rear window defroster has deactivated itself prematurely or cannot be activated. - Switch off any consumers that are not required, e.g. reading lamps or interior lighting. When the battery ...

Cleaning the headliner and carpets
Roof lining: use soft brushes or dry shampoo if it is particularly dirty. Carpets: use carpet and textile cleaners that have been approved and recommended by Mercedes-Benz. ...

Increasing the volume
In some cases, the volume of the AUX device may be quieter or louder, or the usual maximum possible volume cannot be reached. On some devices, it is possible to adjust the volume separately. I ...