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