Adjusting the head restraints of the rear seats mechanically
WARNING Risk of injury due to head restraints which are not fitted or are adjusted incorrectly
If head restraints are not fitted or are adjusted incorrectly, they cannot provide protection as intended.
There is an increased risk of injury in the head and neck area, e.g. in the event of an accident or when braking.
Always drive with the head restraints fitted.
Before driving off, make sure for every vehicle occupant that the centre of the head restraint supports the back of the head at about eye level.
Do not interchange the head restraints of the front and rear seats. Otherwise, you will not be able to adjust the height and angle of the head restraints correctly.
Adjust the head restraint fore-and-aft position so that it is as close as possible to the back of your head.
To raise:
pull the head restraint up. To lower:
press the release knob 
in the direction of the arrow and push the head restraint down.