See also:

Displaying navigation instructions
In the Navi menu, the multifunction display shows navigation instructions. Further information. Activate COMAND. Press the or button on the steering wheel to select the Navi menu. ...

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 ...

Lowering the vehicle
  Turn the crank of the jack counterclockwise until the vehicle is once again standing firmly on the ground.   Place the jack to one side.   Tighten the wheel bolts evenly in a ...