Mercedes-Benz M-Class Operator's Manual page 56

Occupant safety
54
Problem
The PASSENGER AIR
BAG OFF indicator
lamp does not light up
and/or stays on.
The front-passenger
seat is:
unoccupied
R
occupied with the
R
weight of a child up
to twelve months old
in a child restraint
system
®
PRE-SAFE (anticipatory occupant
protection system)
Introduction
®
PRE-SAFE takes preemptive measures to
protect occupants in certain hazardous
situations.
Important safety notes
! Make sure that there are no objects in the
footwell or behind the seats when resetting
the seats. There is a risk that the seats
and/or the objects could be damaged.
Despite your vehicle being equipped with the
®
PRE-SAFE system, the possibility of
personal injuries occurring as a result of an
accident cannot be eliminated.
Always adapt your driving style to suit the
prevailing road and weather conditions and
maintain a safe distance from the vehicle in
front. Drive carefully.
Possible causes/consequences and M Solutions
The OCS is malfunctioning.
Make sure there is nothing between the seat cushion and the
X
child seat.
Make sure that the backrest and base of the child restraint
X
system are resting securely on the front-passenger seat. If
necessary, adjust the position of the front-passenger seat.
When installing the child restraint system, make sure that the
X
seat belt is tight. Do not pull the seat belt tight with the front-
passenger seat adjustment. This could result in the seat belt
being pulled too tightly.
Check the installation of the child restraint system.
X
Make sure that no objects are applying additional weight onto
X
the seat.
If the PASSENGER AIR BAG OFF indicator lamp remains off, have
X
the OCS system checked as soon as possible at a qualified
specialist workshop. Do not transport a child on the front-
passenger seat until the OCS has been repaired.
Observe the additional display messages in the multifunction
X
display ( page 293).
Y
Function
PRE-SAFE
R
R
R
PRE-SAFE
depending on the hazardous situation
detected:
R
R
®
intervenes:
in emergency braking situations, e.g. when
BAS is activated
in critical driving situations, e.g. when
physical limits are exceeded and the
vehicle understeers or oversteers severely
on vehicles with DISTRONIC PLUS: if
BAS PLUS intervenes powerfully or the
radar sensor system detects an imminent
danger of collision in certain situations.
®
takes the following measures
the front seat belts are pre-tensioned.
if the vehicle skids, the sliding sunroof and
the side windows are closed so that only a
small gap remains. On vehicles with a
panorama roof with power tilt/sliding
panel, they are closed completely.