Unlocking the driver's door (mechanical key)
If the vehicle can no longer be unlocked with the SmartKey, use the mechanical key.
If you use the mechanical key to unlock and open the driver's door, the anti-theft alarm system will be triggered.
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
counterclockwise to position 1.
The door is unlocked.
Turn the mechanical key back and
remove it.
Insert the mechanical key into the
SmartKey.
See also:
"Electronic crumple zone": even more safety in the M-Class
As ever, the best accident is one which does not happen at all. The safety
engineers at the Mercedes Technology Center are working intensively on this
rather simple sounding statement, which in pr ...
Emergency Tensioning Devices, beltforce limiters
The seat belts for the front seats are equipped
with ETDs/belt buckle tensioners and seat
belt force limiters. The outer seat belts in the
second row of seats are equipped with ETDs and seat belt f ...
Manual interior lighting control
To switch the front interior lighting on/off: press the c button.
To switch the rear interior lighting on/off: press the u button.
To switch the reading lamps on/off: press the p button. ...
