Audi Q7 2017 Manual page 22

Transverse dynamics function
If the vehicle oversteers or understeers, the Electronic
Stability Control (ESC) will try to stabilize the vehicle. If the
vehicle becomes unstable because certain physical limits
have been exceeded, J234 initiates partial tensioning of
the electrically reversible safety belt tensioners. A message
indicating that Audi pre sense is active appears in the
instrument cluster. No audible signal is given.
If the vehicle can no longer be stabilized, the following
actions are initiated:
• The electrically reversible safety belt tensioners are fully
tensioned. A message indicating that Audi pre sense is
active appears in the instrument cluster. No audible
signal is given.
• The side windows and the panoramic glass sunroof are
closed when the safety belts are fully and partially ten-
sioned.
• When the safety belts are fully and partially tensioned,
the hazard warning flashers are activated as long as the
vehicle is unstable.
System characteristics
• If Audi drive select is set to "dynamic" or "lift / offroad",
the safety belts are not partially tensioned.
• If Audi pre sense is switched off in the MMI, the safety
belts are not partially tensioned either.
Crash function in the low relative speed range
If J234 detects a head-on collision at a low relative speed
and at a low rate of vehicle deceleration, the it decides
situation-specifically on the basis of the control module
algorithm whether to initiate electrical full tensioning.
The relative speed is the difference in speed between one's own vehicle and the following vehicle.
2)
18
• When the vehicle is unstable, if the Electronic Stability
Control is set to "lift / offroad" or "off" and if the driver
actively applies the brakes, the safety belts are fully
tensioned. A message indicating that Audi pre sense is
active appears in the instrument cluster. No audible
signal is given. The side windows and the panoramic
glass sunroof are closed. The emergency warning flash-
ers are activated as long as the vehicle is unstable.
If the above-mentioned conditions apply, pyrotechnic
2)
components such as the airbags do not deploy. No further
actions are initiated, for example, activation of the emer-
gency warning flashers, closing of the side windows or the
panoramic glass sunroof.
Audi pre sense
637_041