Audi A8 2019 Service Training page 91

Process diagram showing how Audi Pre sense front responds to pedestrians/cyclists
Key:
Visual advance warning
and/or indication of cor-
rective action
Reconfiguration of
hydraulic brake assist
Closing of the side
windows apart from a
residual gap
Driver take-over prompt
System characteristics of Audi pre sense front
› If an emergency braking maneuver is initiated by the
vehicle, Audi pre sense city can help reduce the vehicle's
speed by up to 37.2 mph (60 km/h).
› Depending on the situation, ABS/ESC Control Module
J104 can instruct the hazard warning flashers (emergency
braking warning) to be activated.
1)
› If the driver takes clear evasive action or applies the
brakes during the collision warning or corrective braking
phases of an Audi pre sense front action, the current
actions of Audi pre sense front (for example, early
warning) will be suppressed or cancelled. If the obstacle
is no longer relevant after this, Audi pre sense front will
cease to provide driver assistance.
› If Audi pre sense is deactivated in the MMI, the warning
and braking functions of Audi pre sense front will be
deactivated, too.
Audible warning beep
Acute warning by braking
impulse
Closing the panoramic
sunroof
› If ESC is set to "off", certain functions of
Audi pre sense front will only be available to a limited
extent or will be unavailable.
› If the functionality of Driver Assistance Systems Front
Camera R242 is impaired due to bad visibility and light
conditions such as darkness or fog, Audi pre sense front
will only be available to a limited extent or will be
unavailable.
› If driver is not wearing a seat belt, certain functions of
Audi pre sense front will only be available to a limited
extent or will be unavailable.
› The front camera for driver assist systems self-initializes
after the ignition is switched on. It may, therefore, be
the case that Audi pre sense front is not available for up
to 20 seconds after turning on the ignition. The
non-availability Audi pre sense front is indicated by the
initialization lamp.
Prefilling of the brake
system
Target braking
Partial tensioning
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