Restoring the factory settings
•► Press the 
and
buttons
simultaneously for approximately six
seconds until the battery check lamp
flashes twice.
See also:
Snow chains
For safety reasons, Mercedes-Benz
recommends that you only use snow chains
which have been specially approved for your
vehicle by Mercedes-Benz, or are of a
corresponding standard of quality.
...
Activating/deactivating
Turn the SmartKey to position 2
in the ignition lock.
To switch on: press the
button. The indicator lamp in the
button lights up. Airflow and air
distribution are set to automatic mode.
or ...
Load index
In addition to the load bearing index, the load
index may also be imprinted on the sidewall
of the tire. This specifies the load bearing
capacity more precisely. ...