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Safety
Occupant safety
2
Activation of emergency tensioning re-
tractors, belt force limiters and airbags
In the event of a collision, the sensor in the
airbag control unit evaluates important
physical data, such as duration, direction
and rate of vehicle deceleration or acceler-
ation. Based on the evaluation of this data
and depending on the vehicle’s rate of lon-
gitudinal deceleration in a collision, in the
first stage, the airbag control unit pre-emp-
tively triggers the emergency tensioning
retractors.
The front airbags are not triggered unless a
second activation threshold is exceeded,
i.e. if there is a greater rate of vehicle de-
celeration in a longitudinal direction.
Criteria for triggering of emergency ten-
sioning retractors and airbags
To determine whether it is necessary to
trigger an emergency tensioning retractor
or airbag, the airbag control unit evaluates
the duration and direction of deceleration
or acceleration during the initial phase of
the collision.
The emergency tensioning retractor and
airbag activation thresholds are variable
and are adapted to the rate of the vehicle
deceleration. This process is pre-emptive
in nature as the airbag must be deployed
during – and not at the end of – the colli-
sion.
In this case, have the SRS system checked
and repaired immediately at a qualified spe-
cialist workshop which has the necessary
specialist knowledge and tools to carry out
the work required.
The manufacturer recommends that you use
an authorized Sprinter Dealer for this pur-
pose. In particular, work relevant to safety
or on safety-related systems must be car-
ried out at a qualified specialist workshop.
i
Airbags are not triggered in all types of
accident. They are actually controlled
by complex sensor technology and
evaluation logic. This process is pre-
emptive in nature as airbag deployment
must take place during the impact and
must be adapted to provide calculated,
additional protection for the vehicle oc-
cupants. Not all airbags are triggered in
an accident.
The various airbag systems work inde-
pendently of each other. However, all
systems depend on the type (head-on
or side impact) and severity (in particu-
lar vehicle deceleration or accelera-
tion) of accident determined in the
initial phase of the accident.