Switching the rear window wiper on/ off
Combination switch
1. 
Switch
2. 
To wipe with washer fluid
3. I To switch on intermittent wiping
4. 0 To switch off intermittent wiping
5. 
To wipe with washer fluid
•► Turn the SmartKey to position 1 or 2 in the ignition lock.
•► Turn switch 1 on the combination switch to the corresponding position.
When the rear window wiper is switched on, the icon appears in the instrument cluster.
See also:
Mercedes-Benz M-Class Owners Manual
...
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 trigg ...
Uniform Tire Quality Grading Standards
A uniform standard to grade the quality of
tires with regards to tread quality, tire traction
and temperature characteristics. Ratings are
determined by tire manufacturers using U.S. government ...