Mercedes-Benz Black Series Operator's Manual page 52

Occupant safety
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If after six seconds the driver or front
passenger have not fastened their seat belts
and the doors are closed:
the 7 seat belt warning lamp remains lit
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as long as either the driver's or front-
passenger's seat belt is not fastened
and if the vehicle speed exceeds 15 mph
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(25 km/h) once, the 7 seat belt warning
lamp lights up. Additionally, a warning tone
sounds with increasing intensity for a
maximum of 60 seconds or until the
driver's and front passenger's seat belts
are fastened.
If the driver or front-passenger seat belt is
unfastened 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 lit.
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 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 belt" ( page 177).
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Emergency Tensioning Devices, seat
belt force limiters
The seat belts are equipped with ETDs and
seat belt force limiters.
! If the co-driver's seat is unoccupied, do
not insert the belt tongue into the buckle of
the co-driver's seat. This may otherwise
lead to the triggering of the Emergency
Tensioning Device in the event of an
accident, which will then need to be
replaced.
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 activated, are
employed to help reduce the peak force
exerted by the seat belts on occupants during
a crash.
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.
When the ignition is switched on, the ETDs
cannot be triggered unless:
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 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 are triggered depending on the type
and severity of an accident:
in the event of a head-on or rear-end
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collision, if the vehicle decelerates or
accelerates rapidly in a longitudinal
direction during the initial stages of the
impact
in the event of a side impact, if the vehicle
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is subjected to high lateral acceleration/
deceleration
in certain situations, if the vehicle rolls over
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and the system determines that it can
provide additional protection
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
page 37)
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