Mercedes-Benz E-Class Owner's Manual page 155

Problems with the windscreen wipers
Problem
The windscreen wipers
are jammed.
The windscreen wipers
fail completely.
Possible causes/consequences and M Solutions
Leaves or snow, for example, may be obstructing the windscreen
wiper movement. The wiper motor has been deactivated.
X
For safety reasons, you should remove the key from the ignition
lock.
or
X
Switch off the engine using the Start/Stop button and open the
driver's door.
X
Remove the cause of the obstruction.
X
Switch the windscreen wipers back on.
The windscreen wiper drive is malfunctioning.
X
Select another wiper speed on the combination switch.
X
Have the windscreen wipers checked at a qualified specialist
workshop.
Windscreen wipers
153
Z