Mercedes-Benz GLS Owner's Manual page 123

120 Seats and stowing
Vehicles with a third row of seats
The head restraints on the third row of seats
have a usage position and a non-usage position.
The usage position is the extended, top position
in which the head restraint engages; the non-
usage position is the bottom, retracted position
of the head restraint. If the seats on the third
row of seats are being used, the head restraint
must be in the top, engaged usage position.
If the third row of seats is occupied: move
#
the head restraints to the very top and have
them engage there.
If the third row of seats is not occupied:
#
move the head restraints to the very bottom.
Fitting/removing the head restraint of the
middle rear seat on the second row
Removing
Release the middle rear seat backrest and
#
fold it forward slightly ( page 139).
/
Pull the head restraint upwards as far as it
#
will go.
Push release knob 1 in the direction of the
#
arrow and pull out the head restraint.
Installing
Insert the head restraint such that the
#
notches on the bar are on the left when
viewed in the direction of travel.
Push the head restraint down until it
#
engages.
Fold the middle rear seat backrest back until
#
it engages.
Adjusting the luxury head restraints of the
rear seats mechanically
Mercedes-Maybach vehicles: you can set only
the side bolsters mechanically. You can adjust
the angle of the head restraint electrically.