Emergency Tensioning Devices - Mercedes-Benz C-Class Coupe Operator's Manual

If the driver or front passenger have not
fastened their seat belt after 6 seconds and
the doors are closed, the 7 seat belt
warning lamp lights up.
until the driver or the front passenger have
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fastened their seat belts
if a vehicle speed of 15 mph (25 km/h) is
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exceeded once, a warning tone with
increasing intensity sounds additionally for
a maximum of 60 seconds or until the driver
or front passenger have fastened their seat
belts.
If the driver or front passenger undo their seat
belts during the journey, the 7 seat belt
warning lamp lights up and the warning tone
sounds again.
The warning tone ceases even if the driver or
front passenger have still not fastened their
seat belt after 60 seconds. The 7 seat belt
warning lamp stops flashing but continues to
be lit.
Once the vehicle is stationary, the warning
tone is reactivated and the 7 seat belt
warning lamp starts to flash again if the
vehicle speed exceeds 15 mph (25 km/h)
once.
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,
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seat belt" ( page 227).
Emergency Tensioning Devices, 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.
Occupant safety
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.
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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 ETDs 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
if, in the event of a side impact, on the side
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opposite the impact the vehicle
decelerates or accelerates rapidly in a
lateral direction
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.
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