Belt Force Limiters - Mercedes-Benz 2013 C-Class Coupe Operator's Manual

If the driver/front passenger unfasten their
seat belt while the vehicle is in motion, the
7 seat belt warning lamp lights up and a
warning tone sounds again.
The warning tone ceases even if the driver or
front-passenger seat belt has still not been
fastened after 60 seconds. The 7 seat belt
warning lamp stops flashing but remains
illuminated.
After the vehicle comes to a standstill, the
warning tone is reactivated and the 7 seat
belt warning lamp flashes again if the vehicle
speed again exceeds 15 mph (25 km/h).
The 7 seat belt warning lamp only goes
out if:
both the driver and the front passenger
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have fastened their seat belts.
or
the vehicle is stationary and a door is open.
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For more information on the 7 seat
belt warning lamp, see "Warning and
indicator lamps in the instrument cluster,
seat belts" ( page 234).
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Emergency Tensioning Devices, seat

belt force limiters

The seat belts 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.
When triggered, the seat belt force limiters
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.
They take on a part of the deceleration force,
resulting in the force exerted on the occupant
being distributed over a greater area.
Occupant safety
The ETDs can only be activated when:
the ignition is switched on
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the restraint systems are operational; see
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"SRS warning lamp" (
the belt tongue is engaged in the buckle on
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each of the lap-shoulder belts in the front
the front-passenger seat is occupied and
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the belt tongue is engaged in the buckle on
the front-passenger side
The ETDs on the seats in the rear
compartment are triggered independently of
the lock status of the seat belts.
The Emergency Tensioning Devices are
triggered depending on the type and severity
of an accident, if:
in the event of a head-on or rear-end
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collision, the vehicle decelerates or
accelerates rapidly in a longitudinal
direction during the initial stages of the
impact
in the event of a side impact, the vehicle
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decelerates or accelerates rapidly in a
lateral direction on the side opposite the
impact
If the Emergency Tensioning Devices (ETDs)
are triggered, you will hear a bang, and a small
amount of smoke may also be released. Only
in rare cases will the bang affect your hearing.
The smoke that is released generally does not
constitute a health hazard. The 6 SRS
warning lamp lights up.
G WARNING
Pyrotechnic ETDs that were activated must be
replaced.
For your safety, when disposing of the
pyrotechnic ETDs always follow our safety
instructions. These are available at any
authorized Mercedes-Benz Center.
! If the front-passenger seat is not
occupied, do not engage the seat belt
tongue in the buckle on the front-
passenger seat. Otherwise, the Emergency
Tensioning Device could be triggered in the
event of an accident.
page 41).
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