Mercedes-Benz 2009 M-Class Operator's Manual page 130

Controls in detail
Driving and parking
i Always engage the parking brake in
addition to shifting the automatic
transmission into park position P.
When parked on an incline, also turn the
front wheels towards the road curb.
i Observe instructions if you want the
automatic transmission to remain in
neutral position N, see "Remaining in
neutral position N" ( Y page 130).
With SmartKey
X
Turn the SmartKey in the starter switch to
position 0.
X
Remove the SmartKey from the starter
switch.
The immobilizer is activated.
If you turn off the engine using the SmartKey,
and remove the SmartKey from the starter
switch or open a front door, the automatic
transmission will shift into park position P
automatically.
G Warning!
Keep in mind that turning off the engine
alone only will shift the automatic
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transmission into neutral position N
automatically.
Always shift the automatic transmission
into park position P before turning off the
engine.
Otherwise the vehicle could roll away which
could result in an accident and/or serious
personal injury.
With KEYLESS-GO
X
Press the KEYLESS-GO start/stop button.
With the driver's door closed, the starter
switch is now in position 1. With the driver's
door opened, the starter switch is set to
position 0, same as the SmartKey removed
from the starter switch ( Y page 94).
If you turn off the engine using the KEYLESS-
GO start/stop button and open a front door,
the automatic transmission will shift into park
position P automatically.
G Warning!
Keep in mind that turning off the engine
alone only will shift the automatic
transmission into neutral position N
automatically.
Always shift the automatic transmission
into park position P before turning off the
engine.
Otherwise the vehicle could roll away which
could result in an accident and/or serious
personal injury.
i In an emergency you can turn off the
engine while driving by pressing and
holding the KEYLESS-GO start/stop button
for approximately 3 seconds.
If you have started the engine with the
KEYLESS-GO start/stop button and cannot
turn it off as described above:
X
Remove the KEYLESS-GO start/stop
button from the starter switch.
X
Insert the SmartKey into the starter switch.
The engine turns off. The starter switch is
in position 0 ( Y page 94).