Audi A8 2019 Service Training page 84

Function
The four radar sensors continuously monitor the traffic to
the side of as well as in front of and behind one's own
vehicle, even when Audi side assist and intersection assist
are inactive. The signals recorded by the radar sensors are
sent to Driver Assistance Systems Control Module J1121 as
data.
J1121 merges the data so that an exact map the vehicle
periphery can be created and evaluated. If critical objects are
detected on either side of one's own vehicle, the information
is sent to the Airbag Control Module J234. The airbag control
module evaluates the data and can instruct other systems to
initiate the appropriate actions.
In the case of Audi pre sense side, a critical situation is
when a vehicle approaching from the side will, with a high
degree of probability, collide into the side of your vehicle.
Process diagram of Audi pre sense side
Key:
Visual advance warning
and/or indication of cor-
rective action
Closing of the side
windows apart from a
residual gap
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If the airbag control module detects a critical situation, it
takes the following measures almost simultaneously:
› Raising of the vehicle on the collision-facing side (to be
implemented at a future date).
› Full tensioning of the reversible seat belt tensioners.
› Closing of the side windows apart from a residual gap.
› Closing of the panoramic sunroof.
› The electrical upper backrests move into an upright
position.
› The electrical head restraints move into an elevated
position.
› Locking of the doors.
› A visual message indicating that Audi pre sense is active
appears in the instrument cluster.
Raising of the vehicle on
the collision-facing side
Closing the panoramic
sunroof
Movement of the upper
backrests into the upright
position
Full tensioning
Locking of the doors
Movement of the electri-
cal head restraints into
the upright position
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