Audi TT (2007 year). Manual — part 220
13
Front passenger airbag
Airbag igniter 1, front passenger side N131
Airbag igniter 2, front passenger side N132
An airbag module with a two-stage hybrid gas generator is used in the Audi TT Coupé ‘07 on the front
passenger side.This module is already in use in the Audi Q7. However, it has been adapted for the TT Coupé.
Two pyrotechnic propellant charges integrated in a pressurised gas bottle are activated separately by the
airbag control unit.
The so-called cold gas in the pressurised gas bottle is under approx. 250 bar of pressure and is a mixture of
approx. 98 % argon and approx. 2 % helium.
361_002
Igniter II
Pressurised gas bottle
Gas: approx. 98 % argon
approx. 2 % helium
Pressure: approx. 250 bar
Ignition charge I
Filter
Igniter I
Propellant charge I
Coil spring
Ignition charge II
Propellant charge II
Coil spring
Rupture disc
Reference
For more information about the
function of the front passenger front
airbag, refer to Self-Study Programme
361 Audi Q7.
14
Side airbags
Side airbag igniter, driver side N199
Side airbag igniter, front passenger side N200
Airbag modules which cover both the body and
head areas - so-called head-thorax airbags - are
used as side airbags.
Tubular gas generators filled with solid propellant
inflate the airbags with gas in the event of a crash.
Occupant protection
The airbag control unit J234 energises the corresponding side airbag igniter. The ignition charge which is
ignited by the igniter in turn ignites the actual propellant charge. The developing gas is treated and cooled by
the metal filter, whereupon it unfolds and inflates the airbag.
361_022
Air outlet
Air outlet
Metal filter
Ignition charge
Propellant charge
Detonator
380_004
15
The Audi TT Coupé ‘07 is equipped with redesigned
belt tensioners for the driver and front passenger.
These belt tensioners are so-called "band
tensioners".
The TT Coupé for the North American market is also
equipped with these belt tensioners.
If the rear seats in the TT Coupé are equipped with
Isofix fixing eyelets, belt tensioners are also
installed for these seats.
The workshop manual (ElsaWin) applicable to the
vehicle describes the tests which must be made to
detect an activated belt tensioner (band tensioner).
An activated belt tensioner can be detected, among
other things, by virtue of the fact that the foil
located on the side of the belt tensioner housing is
detached from the housing.
Driver seat belt tensioner igniter -1- N153
Front passenger seat belt tensioner igniter -1- N154
A metal band is wrapped around the seat belt
retractor shaft.
Both open ends are connected to the seat belt
retractor shaft.
The closed end is looped around the belt tensioner
igniter.
380_027
Metal band
Electrical connector
Seat belt retractor
shaft
Detonator
Metal band loop
380_030
Seat belt
Inertia-reel seatbelt
Foil
Belt tensioner unit
16
The belt tensioner igniter is located inside the metal
band loop.
When the igniter is activated by the airbag control
unit, the resultant pressure causes the
loop of the metal band to expand.The movement of
the metal band exerts a pull on the seat belt
retractor shaft, which thereupon begins to rotate,
tensioning the seat belt.
Occupant protection
380_028
Metal band
Electrical connector
Seat belt retractor
shaft
Detonator
Metal band loop
The casing and casing cover surface between which
the metal band moves are coated in a layer of
silicon. When the metal band moves, it thrusts
a part of this silicon layer ahead of itself and
thereby ensures that a tight seal is maintained.
Pressure losses are thus reduced.
380_026
Casing
Silicon layer
Casing cover
Metal band
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