See also:

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. ...

Important safety notes
Do not leave the SmartKey in the trunk/cargo compartment. You could otherwise lock yourself out. WARNING When leaving the vehicle, always remove the SmartKey from the ignition lock. Always ...

General information
The ECO start/stop function is only available for the S 63 AMG. The ECO start/stop function is only available in drive program C. The ECO start/stop function switches the engine off automatica ...