Never tamper with electronic components
and their software.
SRS (Supplemental Restraint System)
SRS reduces the risk of occupants coming
into contact with the vehicle's interior in the
event of an accident. It can also reduce the
forces to which occupants are subjected dur-
ing an accident.
SRS consists of:
R the 0081 SRS warning lamp
R belt tensioners
R belt force limiters
R airbags
The 0081
0081 SRS warning lamp The SRS functions are checked regularly
when you turn on the ignition and when the
engine is running. Therefore, malfunctions
can be detected in good time.
The 0081 SRS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out no later than afew seconds
after the engine is started. G
Risk of injury
If SRS is malfunctioning, individual systems
may be activated unintentionally or not be
deployed in the event of an accident with
heavy braking.
Am alfunction has occurred if the 0081SRS
warning lamp:
R does not light up when you switch on the
ignition
R does not go out after the engine has been
running for afew seconds
R lights up again once the engine is running
In this case, have SRS checked immediately
at aq ualifieds pecialist workshop. Triggering of belt tensioners, belt force
limiters and airbags In the event of
acollision, the airbagc ontrol
unit evaluates important physical data such
as duration, direction and force of the vehicle
deceleration or acceleration. Based on the
evaluation of this data and in the event of lon-
gitudinal deceleration, in acollision, and
depending on the rate of deceleration, the
airbagc ontrol unit pre-emptively triggers the
belt tensioners in the first stage.
i The belt tensioners can only be triggered
if the belt tongue is correctly engaged in the
seat belt buckle.
The front airbags are only deployed if there is
an even higher rate of vehicle deceleration in
al ongitudinal direction.
Your vehicle has adaptive, duals tage front
airbags. When the first activation threshold is
reached, the front airbagisf illedwith enough
propellant gas to reduce the risk of injuries.
The front airbagiso nly fullydeployed if asec-
ond threshold is reached within afew milli-
seconds, due to the control unit having detec-
ted further deceleration.
Criteria for triggering belt tensioners and
airbags
In the first stage of acollision, the airbagc on-
trol unit evaluates the duration and direction
of vehicle acceleration or deceleration, in
order to determine whether it is necessary to
trigger abelt tensioner or an airbag.
The belt tensioner and airbagt riggering
thresholds are variable and are adapted to the
rate of deceleration of the vehicle. This proc-
ess is pre-emptive in nature as the airbag
must be deployed during –and not at the end
of –t he collision.
i Airbags are not deployed in all types of
accidents. They are controlled by complex
sensor technology and evaluation logic.
This process is pre-emptive in nature as
airbagd eployment must take place during
the impact and must be adapted to provide Occupant safety
35Safety
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