Mercedes-Benz 2005 M-Class Operator's Manual page 36

Getting started
Unlocking
i
The key can only be withdrawn in
position 0.
If necessary, move steering wheel
slightly to allow the key to be turned
clockwise to position 1.
A warning sounds when the driver's
door is opened and the key is in steer-
ing lock position 0 or 1.
The key can only be removed from the
steering lock with the gear selector le-
ver in position P.
!
To prevent accelerated battery dis-
charge and a possible dead battery, al-
ways remove the key from the steering
lock when the engine is not in opera-
tion.
For more information, see "Remote control
with folding key" ( page 88).
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