Adjusting the head restraints of the rear seats mechanically
WARNING Risk of injury due to head restraints not being fitted or being adjusted incorrectly
If head restraints have not been installed or have not been adjusted correctly, 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.
For vehicles with sports seats, it is not possible to adjust the outer head restraints.
To raise:
pull the head restraint up. To lower:
press release knob 
in the direction of the arrow and push the head restraint down.