Belt Force Limiters - Mercedes-Benz 2013 SL Operator's Manual

If after six seconds the driver or front
passenger have not fastened their seat belts
and the doors are closed, the ü seat belt
warning lamp lights up:
until the driver's or front passenger's seat
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belt is fastened
if a vehicle speed of 15 mph (25 km/h) is
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exceeded, a warning tone also sounds with
increasing intensity for a maximum of
60 seconds or until the driver or front
passenger have fastened their seat belts.
If the driver/front passenger unfasten their
seat belt while the vehicle is in motion, the
ü seat belt warning lamp lights up and a
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 ü seat belt
warning lamp stops flashing but remains
illuminated.
After the vehicle comes to a standstill, the
warning tone is reactivated and the ü seat
belt warning lamp flashes again if the vehicle
speed again exceeds 15 mph (25 km/h).
The ü 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 ü seat
belt warning lamp, see "Warning and
indicator lamps in the instrument cluster,
seat belt" ( page 270).
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Emergency Tensioning Devices, seat
belt force limiter
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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.
Occupant safety
! 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.
The seat belts are equipped with Emergency
Tensioning Devices and 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, seat belt force limiters help
to reduce the peak force exerted by the seat
belt on the vehicle occupant.
The seat belt force limiters are synchronized
with the front air bags, which 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 three-point 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, in certain situations where the vehicle
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overturns, the system determines that it
can provide additional protection
If the ETDs are deployed, you will hear a bang,
and a small amount of powder may also be
page 53).
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