Mercedes-Benz 2005 M-Class Operator's Manual page 48

Getting started
Driving
Seat belt height adjustment
Seat belt height can be adjusted for the fol-
lowing seats:
Driver's seat
Passenger seat
Outer rear seats
Adjust seat belt so that the shoulder por-
tion is located as close as possible to the
middle of the shoulder (it should not touch
the neck or pass under the arm).
46
1 Release button
Adjusting seat belt higher
Slide belt outlet upward.
The belt outlet engages in various posi-
tions.
Adjusting seat belt lower
Press and hold release button 1.
Slide belt outlet in desired position.
Let go of release button 1.