Mercedes-Benz 2005 M-Class Operator's Manual page 106

Controls in detail
Seats
Disengage belt and engage hook 2
( page 103) in ceiling mount.
Pull on free end of belt until tight.
Install head restraint in openings
provided in seat cushion.
Install cargo floor plates ( page 165).
Warning!
After folding the seats up, manually place
the lap belt portion of the seat belt behind
the seat (arrow). Otherwise, the lap belt may
be subject to damage and could rip.
104
Removing single seat
G
1 Hook
2 Tensioner
3 Hook and loop fastener strip
4 Release lever
Lift tensioner 2 upward to a horizon-
tal position to release tension of the
belt.
Disengage hook 1 while holding onto
the seat firmly with one hand.
Attach belt at hook and loop fastener
strip 3 on underside of seat.
Move release lever 4 upward and re-
move seat.
Installing single seat
Place seat into the mounting clamps
and click the seat into place.