Mercedes-Benz E-Class: Emergency Tensioning Devices, belt
force limiters
The front seat belts and the outer seat belts in the rear are equipped with ETDs and seat belt force limiters.
The ETDs tighten the seat belts in an accident, pulling them close against the body.
The ETDs 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 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 rear compartment 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, the system determines that it
can provide additional protection
If the air bags are deployed, 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.
WARNING
Pyrotechnic Emergency Tensioning Devices
that have been deployed must be renewed.
For your safety, when disposing of Emergency Tensioning Devices, always observe the safety instructions. These are available from any authorized Mercedes-Benz Center.
The PRE-SAFE® system has electrically operated reversible pre-tensioners that do not require replacement after activation.
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 could be triggered in the event of an accident.
Belt warning for the driver and front
passenger
Regardless of whether the driver and front
passenger have fastened their seat belts
already, the seat belt warning lamp
lights up for 6 seconds after every engine
start. It then goes out if t ...
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