If the vehicle can no longer be centrally locked with the SmartKey, use the mechanical key.
► Close the front-passenger door, the rear doors and the tailgate.
► Press the locking button .
► Make sure that the locking knobs on the doors are still visible. Press down the locking knobs by hand, if necessary.
► Close the driver's door from the outside.

► 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.
► 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.
Engine number
1 Emission control information plate,
including the certification of both federal
and Californian emissions standards
2 Engine number (stamped into the
crankcase)
3 VIN (on the lower edge of th ...
Qualified specialist workshop
An authorized Mercedes-Benz Center is a
qualified specialist workshop. It has the
necessary specialist knowledge, tools and
qualifications to correctly carry out the work
required on your vehicle. ...
Occupant Classification System
(OCS)
Method of operation
WARNING
If the indicator lamp
illuminates
when an adult or someone larger than a small
individual is in the front passenger seat, have
the front passenger reposition himself ...