Seat Belt Force Limiter; Automatic Comfort-Fit Feature - Mercedes-Benz 2011 SL550 Roadster Operator's Manual

If after these 6 seconds the driver's or the
passenger's seat belt (with the passenger
seat occupied) is not fastened with both
doors closed,
the seat belt telltale 7 remains
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illuminated for as long as either the driver's
or passenger's seat belt is not fastened.
and if the vehicle speed once exceeds
R
15 mph (25 km/h), the seat belt telltale
7 starts flashing and a warning chime
sounds with increasing intensity for a
maximum of 60 seconds or until the
driver's and passenger's seat belt are
fastened.
If you and/or your passenger release the
seat belt during driving, the seat belt
telltale 7 starts flashing and the
warning chime sounds as described before.
If the driver's or the passenger's seat belt
remains unfastened after 60 seconds, the
warning chime stops sounding, the seat
belt telltale 7 stops flashing but
continues to be illuminated.
After a vehicle standstill, the warning chime
is reactivated and the seat belt telltale
7 is flashing again if the vehicle speed
once exceeds 15 mph (25 km/h).
The seat belt telltale 7 will only go out if
both the driver's and the passenger's seat
belt (with the passenger seat occupied) are
fastened, or the vehicle is standing still and a
door is opened.
For more information, see "Practical hints"
( Y page 256).
Emergency Tensioning Device (ETD),

seat belt force limiter

The seat belts are equipped with ETDs and
seat belt force limiters.
Occupant safety
The ETDs are designed to activate in the
following cases:
in frontal or rear-end impacts exceeding
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the system's preset deployment threshold
if the restraint systems are operational and
R
functioning correctly, see "SRS indicator
lamp" ( Y page 38)
in certain vehicle rollovers if the system
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determines an additional degree of
protection
The ETDs will only activate if the seat belts are
fastened (latch plate properly inserted into
buckle).
In an impact, the ETDs remove slack from the
seat belts in such a way that the seat belts fit
more snugly against the body. Seat belt force
limiters, when activated, are employed to
help reduce the peak force exerted by the
seat belts on occupants during a crash.
i The ETDs do not correct an incorrect seat
position or incorrectly worn seat belts.
The ETDs do not pull occupants back
toward the seat backrest.
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.
Automatic comfort-fit feature seat belt
The automatic comfort-fit feature reduces the
retracting force of the seat belts when they
are in normal use.
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