Mercedes-Benz 2003 M-Class Operator's Manual page 98

Controls in detail
Seats
Removing single seat
1 Hook
2 Tensioner
3 Hook and loop strip
4 Release lever
98
Lift tensioner 2 upward to a horizontal
position to release tension of the belt.
Disengage hook 2 while holding onto
the seat firmly with one hand.
Attach belt at hook and loop 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.