Audi A8 2019 Service Training page 93

Turning to the left, example
The driver wants to turn to the left with his vehicle (1). Turn
assist can only assist the driver with turning to the left if
the vehicle (1) is traveling at a speed of less than 6.2 mph
(10 km/h).
As described under "Function", the radar sensor, the front
camera and the laser scanner continuously monitor the
traffic in front of one's own vehicle (1). When the turn
signal is switched to the left position, the oncoming traffic
is also monitored. When the turn signal is switched to the
left position, the ACC control module knows that the driver
intends to turn off to the left. If J1122 detects that turning
now would result in a critical situation involving oncoming
Process diagram showing the working principle of Audi pre sense turn assist
Key:
Reconfiguration of
hydraulic brake assist
Audible warning beep
System characteristics of the turn assist function
› Turn assist is only available while turning left or traveling
at speeds below 6.2 mph (10 km/h).
› The turn signals must be activated before turning.
› If turn assist is active, it is indicated both visually and
audibly.
traffic (2), it instructs the ABS/ESC Control Module J104 to
reconfigure hydraulic brake assist. If the driver (1) were
now to continue with the turning maneuver and start to
drive away, this will be detected by the ACC control module
through the wheel speed sensor signals of ABS/ESC Control
Module J104. In this case, the ACC control module instructs
J104 to initiate an automatic emergency braking maneuver.
The vehicle (1) comes to a standstill in its own lane due to
the emergency braking maneuver. Visual and audible mes-
sages indicating that Audi pre sense is active appear in the
instrument cluster.
Automatic braking up to
emergency braking inten-
sity
Visual advance warning
and/or indication of cor-
rective action
662_167
89