See also:

Mercedes-Benz M-Class Owners Manual
...

Centrally locking and unlocking the vehicle from the inside
You can centrally lock or unlock the vehicle from the inside. The central locking/unlocking button does not lock or unlock the fuel filler flap. The buttons are located on both front doors. Yo ...

Resetting values
You can reset the values of the following functions:  - Trip odometer  - Trip computer "From start"  - Trip computer "From reset" •► Press the butt ...