See also:

Important safety notes
WARNING If you tow the vehicle, you must use a rigid towing bar if: the engine is not running. there is a brake system malfunction. there is a malfunction in the power supply or the vehi ...

The windshield wipers are obstructed
Leaves or snow, for example, may be obstructing the windshield wiper movement. The wiper motor has been deactivated. - For safety reasons, you should remove the SmartKey from the ignition lock. ...

Transfer case
The vehicle has permanent 4-wheel drive (4MATIC). Power is always transmitted to both axles. Performance tests may only be carried out on a 2-axle dynamometer. The brake system or transfer ca ...