Triggering - Mercedes-Benz Citan 2015 Operating Instructions Manual

In the event of a side impact, the windowbag is
deployed on the side on which the impact
occurs.
If the system determines that it can offer addi-
tional protection to that provided by the seat
belt, a windowbag may be deployed in other
Y
accident situations (
Deployment of belt tensioners and air-
bags
Important safety notes
G
WARNING
After the airbag deploys, the airbag parts are
hot. There is a risk of injury.
Do not touch the airbag parts. Have a
deployed airbag replaced at a qualified spe-
cialist workshop as soon as possible.
G
WARNING
Pyrotechnic seat belt tensioners that have
been deployed are no longer operational and
are unable to perform their intended protec-
tive function. This poses an increased risk of
injury or even fatal injury.
Therefore, have pyrotechnic belt tensioners
which have been triggered immediately
replaced at a qualified specialist workshop.
Mercedes-Benz recommends that you have the
vehicle towed to a qualified specialist workshop
after an accident. This is particularly important if
a belt tensioner or an airbag has been triggered.
If the belt tensioners or airbags are deployed,
you will hear a bang, and a small amount of
powder may also be released. The 6
restraint system warning lamp lights up.
Only in rare cases will the bang affect your hear-
ing. The powder that is released generally does
not constitute a health hazard, however it may
cause short-term breathing difficulties to per-
sons suffering from asthma or other pulmonary
conditions. If it is safe to do so, you should leave
the vehicle immediately or open a window in
order to prevent breathing difficulties.
page 35).
Occupant safety
Mode of operation
During the first stage of a collision, the restraint
system control unit evaluates important physi-
cal data relating to vehicle deceleration or accel-
eration, such as:
duration
R
direction
R
intensity
R
Based on the evaluation of this data, the
restraint system control unit triggers the belt
tensioners in the event of a frontal or rear colli-
sion.
A belt tensioner can only be triggered if:
the ignition is switched on
R
the components of the restraint system are
R
operational. You can find further information
under "Restraint system warning lamp"
Y
( page 29)
The belt tensioner can only be triggered if:
the ignition is switched on
R
the components of the restraint system are
R
operational. You can find further information
under "Restraint system warning lamp"
Y
( page 29)
If the restraint system control unit detects a high
accident severity, additional components of the
restraint system are activated independently of
one another in certain frontal collision situa-
tions:
Driver's airbag
R
Co-driver's airbag
R
The activation thresholds for the belt tensioner
and airbag are determined by evaluating the
vehicle deceleration or vehicle acceleration that
occurs at different points in the vehicle. This
process is pre-emptive in nature. The triggering
process must take place in good time at the
start of the collision.
The vehicle's rate of deceleration or accelera-
tion and the direction of the force are essentially
determined by:
the distribution of the force during the impact
R
the collision angle
R
the deformation characteristics of the vehicle
R
the characteristics of the object with which
R
the vehicle has collided
Factors which can only be seen and measured
after the collision has occurred do not play a
decisive role in the deployment of an airbag. Nor
35
Z