Mercedes-Benz 2009 M-Class Operator's Manual page 120

Controls in detail
Wipers
Rear window wiper indicator
6
X
Switch on the ignition.
The rear window wiper engages automatically
when the automatic transmission is shifted
into reverse gear R with the windshield wipers
switched on.
X
Activating intermittent wiping: Turn rear
window wiper switch to position &.
1
In the lower multifunction display you will
see rear window wiper indicator 6,
indicating that the rear window wiper is
activated.
X
Deactivating intermittent wiping: Turn
rear window wiper switch
1
(.
Indicator for the rear window wiper is
6
cleared from the lower multifunction
118
display, indicating that the rear window
wiper is deactivated.
X
Wiping with washer fluid: Turn and hold
rear window wiper switch
or until the rear window is clean.
% )
For information on filling up the washer
reservoir, see "Washer system and headlamp
cleaning system" (
Problems with wipers
! If anything blocks the windshield wipers
(leaves, snow, etc.), switch them off
immediately.
For safety reasons, stop the vehicle in a
safe location, and
remove the SmartKey from the starter
R -
switch
or
turn off the engine by pressing the
-
to position
KEYLESS-GO start/stop button and
open the driver's door (with the
driver's door open, starter switch is in
position 0, same as with SmartKey
removed from starter switch)
engage the parking brake
-
in position
1
Y page 244).
before attempting to remove any
blockage.
Remove blockage.
R
Turn the windshield wipers on again.
R
If the windshield wipers fail to function at
all with the combination switch in position
or V,
U
set the combination switch to the next
R
higher wiper speed
have the windshield wipers checked at
R
the nearest authorized Mercedes-Benz
Center