If the vehicle can no longer be locked with the SmartKey, use the mechanical key.
■ Open the driver's door.
■ Close the front-passenger door, the rear doors and the tailgate.
■ Press the locking button .
■ Check whether the locking knobs on the front-passenger door and the rear doors are still visible. Press down the locking knobs manually, if necessary .
■ Close the driver's door.
■ Take the mechanical key out of the SmartKey .
■ Insert the mechanical key into the lock of the driver's door as far as it will go.

1 To lock
■ Turn the mechanical key clockwise as far as it will go to position 1.
■ Turn the mechanical key back and remove it.
■ Make sure that the doors and the tailgate are locked.
■ Insert the mechanical key into the SmartKey.
If you lock the vehicle as described above, the fuel filler flap is not locked. The antitheft alarm system is not armed.
Winter operation
Please bear the following in mind
At the onset of winter, have your vehicle
winterproofed at a qualified specialist
workshop, e.g. at an authorized Mercedes-
Benz Center.
Observe the notes in the ...
Adjusting the head restraints
Important safety notes
WARNING
For safety reasons, always drive with the rear
head restraints in the upright position when
the rear seats are occupied.
Keep the area around head restraints clea ...
Warning triangle
Setting up the warning triangle
1 Press-stud
2 Reflectors
3 Feet
► Fold feet 3 down and out to the side.
► Pull side reflectors 2 up to form a triangle
and lock them at the top usi ...