Audi Q7 User Manual

19
System characteristics of the reversible seat belt tensioners
• After reducing seat belt slack, the seat belt is released again.
• If a seat belt is not worn, slack is not reduced for this seat belt.
• If thr front passenger airbag is "o", slack is not reduced on the
front passenger side.
Longitudinal dynamics function
• The reversible seat belt tensioners, front left seat belt tensioner
control unit J854 and front right seat belt tensioner control
units J855 are connected to the airbag control unit J234 via a
sub-bus system. The airbag control unit J234 instructs the seat
belt tensioners to reduce the belt slack.
• In the case of Audipresensebasic, tensioning of the reversible
seat belt tensioners can take place at a speed of higher than
30kph when the longitudinal and transverse dynamics func-
tions are active. To activate longitudinal dynamics, the vehicle
must be moving forwards.
An exception here is the crash function in the low relative speed
range (refer to page20).
Hazard braking
If the brake pressure reaches a defined value during a hazard
braking manoeuvre, Audipresensebasic initiates electrical partial
tensioning of the reversible seat belt tensioners. A message
indicating that Audipresense is active appears in the instrument
cluster. No audible signal is given.
Emergency braking
During an emergency braking manoeuvre, the seat belt tensioners
are either partially or fully tensioned. Depending on the situation,
the ABS control unit J104 can instruct the hazard warning flash-
ers
1)
to be activated. A distinction is made between the following
two criteria for emergency braking.
• An emergency braking situation exists if the ABS control unit
J104 detects that brake pressure had reached a specific value
within a defined period of time. If the conditions are met, Audi
presensebasic initiates electrical full tensioning of the revers-
ible seat belt tensioners. A message indicating that
Audipresense is active appears in the instrument cluster. No
audible signal is given.
1)
Not available in all countries.
System characteristics
• If Electronic Stability Control (ESC) is set to "lift/oroad" of
"o" using the TCS/ESP button E256, the seat belts are not
partially tensioned.
• If Audidriveselect is set to "dynamic" or "lift/oroad", the
seat belts are not partially tensioned.
• If Audipresense is switched o in the MMI, the seat belts are
not partially tensioned either.
• An emergency braking situation exists if the given conditions
are not met, but if the ABS control unit J104 has detected an
emergency braking manoeuvre based on the pedal rates. If the
conditions are met, Audi presensebasic initiates electrical
partial tensioning of the reversible seat belt tensioners.
Amessage indicating that Audipresense is active appears in
the instrument cluster. No audible signal is given.
637_019
Drive profile selection
switch module
E592
TCS/ESP button
E256
637_041
Audi pre sense
Operating unit 1 for drive and comfort/
convenience functions
E791
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Audi Q7 Specifications

General

Brand	Audi
Model	Q7
Category	Automobile
Language	English