Audi Q7 2017 Manual page 24

Audi pre sense rear now initiates the following actions,
which can be subdivided into two phases.
Phase 1
1. Initially, the indicators flash rapidly for about 3 second.
This flashing cycle is known as the RECAS warning,
RECAS is the abbreviation for Rear End Collision Avoid-
ance System. Due to the high frequency at which the
indicators are activated, humans see these signals as
flashes of light. The flashing of the indicators alerts
the drivers in following vehicles to a critical situation
ahead and animates them to take appropriate action,
for example, initiate braking. The time of activation of
the RECAS warning depends on the severity of the
critical situation and the relative speed
ing vehicles. Vehicle Electrical System Control Module
J519 activates the RECAS warning.
If the driver in the following vehicle reacts during this
phase, for example, brakes or takes evasive action, and
Audi lane assist control modules J769 and J770 no longer
detect a critical situation, then no further action is taken.
Phase 2
1. If the critical situation still exists, the side windows
and the panoramic glass sunroof are closed. If the
vehicle is equipped with pneumatic front sport seats
or with individual contour seats
the side bolsters of the seat bases and seat backs are
inflated on the driver and front passenger seats.
2. Approximately 1 second after activating the side
windows, the panoramic glass sunroof and inflation of
the side bolsters (the seat bases and seat backs), the
2)
instrument cluster indicates that Audi pre sense is
active.
Optional equipment.
2)
The relative speed is the difference in speed between one's own vehicle and the following vehicle.
3)
20
of the follow-
3)
2)
(PR no. Q1J or Q2J),
2)
RECAS warning
Audi pre sense
637_020
637_105
637_041