Emergency Tensioning Devices, beltforce limiters
The seat belts for the front seats are equipped with ETDs/belt buckle tensioners and seat belt force limiters. The outer seat belts in the second row of seats are equipped with ETDs and seat belt force limiters. The seat belts for the third row of seats are equipped with ETDs.
The ETDs/belt buckle tensioners tighten the seat belts in an accident, pulling them close against the body.
The ETDs/belt buckle tensioners do not correct incorrect seat positions or incorrectly fastened seat belts.
The ETDs do not pull vehicle occupants back towards the backrest.
Seat belt force limiters, when triggered, help to reduce the peak force exerted by the seat belt on the vehicle occupant.
The seat belt force limiters for the front seats are synchronized with the front air bags.
These take on a part of the deceleration force.
Thus, the force exerted on the occupant is distributed over a greater area.
The ETDs/belt buckle tensioners can only be activated when:
• the ignition is switched on.
• the restraint systems are operational; see
"SRS warning lamp"
• the belt tongue is engaged in the buckle on
each of the lap-shoulder belts in the front.
• the front-passenger seat is occupied and
the belt tongue is engaged in the buckle on
the front-passenger side.
The ETDs on the outside seats in the second row and on the seats in the third row are triggered independently of the lock status of the seat belts.
The ETDs are triggered depending on the type and severity of an accident:
• if, in the event of a head-on or
rear-end
collision, the vehicle decelerates or
accelerates rapidly in a longitudinal
direction during the initial stages of the
impact
• if, in the event of a side impact, on the
side
opposite the impact the vehicle decelerates or accelerates rapidly in a
lateral direction
• if in certain situations where the vehicle
overturns and the system determines that
it can provide additional protection
If the Emergency Tensioning Device/belt buckle tensioners are triggered, you will hear a bang, and a small amount of powder may also be released. Only in rare cases will the bang affect your hearing. The powder that is released generally does not constitute a health hazard. The SRS warning lamp lights up.
If the belt buckle tensioners have been triggered on the front seats, the buckle will be pulled down and will be almost flush with the upper edge of the seat. The SRS warning lamp is lit.
WARNING
The belt buckle tensioners on the front seats
only function if the belt buckles can be pulled
down unobstructed. They must not be
restricted in any way. Therefore, do not grab
the belt buckles and do not place any objects
under the belt buckles. Otherwise, the
tensioning of the belt by the buckle is
restricted or will not function, and will not
provide any additional protection.
WARNING
Pyrotechnical ETDs/belt buckle tensioners
that were activated must be replaced.
For your safety, when disposing of the
pyrotechnic ETDs/belt buckle tensioners
always follow our safety instructions. These
instructions are available from any authorized
Mercedes-Benz Center.
The PRE-SAFE® system is equipped with
electrically reversible pre-tensioners that do
not need replacing after deployment.
If the front-passenger seat is not occupied, do not engage the seat belt tongue in the buckle on the frontpassenger seat. Otherwise, the Emergency Tensioning Device/belt buckle tensioner could be triggered in the event of an accident.
See also:
Adjusting the multicontour seat
You can adjust the contour of the front seats
individually so as to provide optimum support
for your back and sides.
► Make sure that the SmartKey is in
position
2 in the ignition lock.
...
MB Info call button
– Press and hold MB Info call button 1 for
more than two seconds.
This initiates a call to the Mercedes-Benz
Customer Assistance Center. The indicator
lamp in MB Info call button 1 flashes ...
"Minispare" emergency spare wheel
The specified tire pressure is printed in yellow on the emergency spare wheel. ...