Audi Q7 User Manual

12
Seat belts
Front automatic belt retractor
Depending on country version and trim level, 2 dierent automatic
belt retractors are used on the Audi Q7.
• Automatic belt retractor with seat belt tensioner and active
belt force limiter
• Automatic belt retractor with belt tensioner, reversible seat
belt tensioner and active belt force limiter
If the vehicle is equipped with Audipresensebasic, the front
automatic belt retractors are equipped with pyrotechnic belt
tensioners, with active belt force limiters and with reversible seat
belt tensioners with electric motors.
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. Seat belt tensioner control units J854 and J855 are purely
actuators. They have no "intelligence" and are activated by the
airbag control unit.
When Audi pre sense basic detects specific driving situations,
corresponding signals are sent to the data bus. The airbag control
unit evaluates the signals and, if necessary, instructs the seat belt
tensioner control unit to partially or fully tension the seat belts via
an electric motor. For further information about Audi pre sense,
refer tothe chapter "Active safety" on page18.
The automatic seat belt retractors use pyrotechnic ball tensioners.
If an automatic seat belt retractor with reversible seat belt ten-
sioner is replaced, it is not necessary to carry out basic setting
using the Guided Fault Finding system.
637_085
Outer automatic seat belt retractors of the 2nd and 3rd seat rows
Depending on country version and trim, the automatic seat belt
retractors of the 2nd and 3rd seat rows are equipped with pyro-
technic belt tensioners.
The automatic seat belt retractors use pyrotechnic push rod ten-
sioners.
637_087
Automatic seat belt
retractor 3rd seat row
Reversible belt tensioner
with electric motor
Pyrotechnic seat
belt tensioner
Active belt force limiter
Automatic seat belt
retractor 2nd seat row
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Audi Q7 Specifications

General

Brand	Audi
Model	Q7
Category	Automobile
Language	English