Mercedes-Benz M-Class Owners Manual

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General notes
If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged. - Check the battery in ...

Inflating the collapsible spare wheel
WARNING Inflate the collapsible spare wheel only after the wheel is properly attached. Inflate the collapsible spare wheel using the tire inflation compressor before lowering the vehicle. ...

Removing a wheel
  Unscrew the wheel bolts. Do not place wheel bolts in sand or on a dirty surface. The bolt and wheel hub threads could otherwise be damaged when you screw them in.   Remove the w ...