Adjusting the height: electrical
The head restraints on the left and right rear passenger seats extend automatically whenever a passenger in the rear seat fastens his or her safety belt.

In addition, the height of the head restraint can be adjusted electrically.
Extending the head restraint
To prevent possible personal injury and property damage, always ensure that the area above the head restraints is clear and unobstructed before extending them upward.
The height adjustment of the head restraint is deactivated when the safety switch for the rear windows, has been pressed.
See also:
Configuring the warning time
After the warning function is switched on, the
warning time can be set via the iDrive. For a late
warning time, prewarning is deactivated.
These settings have no effect on the time of the
warni ...
Adjusting the height
▷ To raise: pull.
▷ To lower: press the button, arrow 1, and
push the head restraint down. ...
Notes
Always make sure that safety belts are being
worn by all occupants before driving away.
Although airbags enhance safety by providing
added protection, they are not a substitute for
safety belts ...
