Mercedes-Benz M-Class 2007 Owners Manual - Manual (Page 81)

80
Safety and Security
Occupant safety
Emergency Tensioning Device (ETD),
seat belt force limiter
Depending on vehicle production date, the
seat belts for the front and rear or rear
outer seats are equipped with emergency
tensioning devices and belt force limiters.
The ETD is designed to activate in the
following cases:
ț in frontal or rear-end impacts
exceeding the system deployment
threshold
ț in certain vehicle rollovers
ț if the restraint systems are operational
and functioning correctly, see
1 indicator lamp (
୴ page 423)
In an impact, emergency tensioning
devices remove slack from the belts in
such a way that the seat belts fit more
snugly against the body. Belt force limiters,
when activated, are employed to help
reduce the peak force exerted by the seat
belts on occupants during a crash. Active head restraint
The active head restraints are intended to
offer the driver and front passenger
increased protection from whiplash type
injuries. In the event of a rear-end collision,
the active head restraints on the driver’s
and front passenger’s seats are designed
to move forward in the direction of travel,
providing the head with increased support
earlier on in the collision sequence. The
active head restraints move forward
whether the seat is occupied or not.
i The ETDs for the front seats will only acti-
vate if the respective front seat belt is fastened
(latch plate properly inserted into buckle).
The ETDs for the rear or rear outer seats (de-
pending on vehicle production date) will activate
with or without the respective seat belt fastened.
Warning!
G
A pyrotechnic emergency tensioning device
(ETD) that was activated must be replaced.
When disposing of the pyrotechnic emer-
gency tensioning device, our safety instruc-
tions must be followed. These are available
at your authorized Mercedes-Benz Light
Truck Center.
Warning!
G
Only use seat or head restraint covers which
have been tested and approved by
Mercedes-Benz for your vehicle model.
Using other seat or head restraint covers
may interfere with or prevent the activation
of the active head restraint. Contact an
authorized Mercedes-Benz Light Truck
Center for availability.