Audi TT (2007 year). Manual — part 219
9
380_005
J234 Airbag control unit
J285 Control unit with display in dash panel insert
J393 Convenience system central control unit
J533 Data bus diagnostic interface (Gateway)
J623 Engine control unit
K19
Seat belt warning system warning lamp
K75
Airbag warning lamp
K145 Front passenger side airbag deactivated
warning lamp (PASSENGER AIRBAG OFF)
N95
Airbag igniter, driver side
N250 Driver side airbag igniter -2-
N131 Front passenger side airbag igniter 1
N132 Front passenger side airbag igniter 2
N153 Driver seat belt tensioner igniter -1-
N154 Front passenger seat belt tensioner igniter -1-
N199 Side airbag igniter, driver side
N200 Side airbag igniter, front passenger side
N253 Battery isolation igniter
T16
16-pin connector, diagnosis connection
10
Occupant protection
Airbag control unit J234
Airbag control unit J234 and integrated electronics have the task of detecting a collision.
In the Audi TT Coupé ‘07 the airbag control unit is attached to the vehicle body in the area of the handbrake
lever.
The airbag control unit is integrated in the CAN powertrain data bus so that it can exchange information with
other control units.
The airbag electronics basically have the following
main tasks:
–
Collision detection (front, side, rear)
–
Defined deployment of the belt tensioners,
airbags and battery disconnect
–
Defined deployment of the second front airbag
stage
–
Evaluation of all input information
–
Permanent monitoring of the complete airbag
system
–
Independent energy supply via capacitor for
a defined period of time
(approx. 150 ms)
–
Fault display via failure warning lamp
–
Storage of error / and crash information
–
Indication of a collision event to other system
components via the powertrain CAN bus or
discrete collision output (conventionally wired)
–
Activate seat belt reminder
To find out which components need replacing after an accident, refer to the valid Workshop Manual in
ElsaWin.
An airbag control unit can only be replaced with a VAS tester running the "Guided Fault Finding" or "Guided
Functions" application.
380_008
Reference
For more information about the
airbag control unit J234, refer to Self-
Study Programmes 323 Audi A6 `05
and 361 Audi Q7.
11
Belt-on warning
The Audi TT Coupé ‘07 has a belt-on warning function for the driver.
The airbag control unit evaluates the information from the driver side belt switch E24 after ignition "on". If the
driver is not wearing a seat belt, a visual warning is given by the seat belt warning system warning lamp K19
integrated in the dash panel insert.If the system determines that the vehicle is moving, an audio warning is
given in addition to the visual warning.As long as the ignition is on, the airbag control unit monitors the
switched condition of seat belt switch E24. If seat belt status changes while terminal 15 is "on", the seat belt
reminder will be reactivated.
361_016
Time diagram for seat belt reminder
Visual and audio signals
- Delayed seat belt fastening
Terminal 15
Road speed
Seat belt fastened
Seat belt warning system warning lamp
Audio signal
ON
OFF
V > 25 kph
v < 25 kph
yes
OFF
ON
OFF
No
ON
Time
Driver side belt switch E24
The "belt-on warning" function needs information
on whether the driver's seat belt is fastened or not.
Seat belt switch E24 in the belt buckle is
a mechanically actuated open-close switch.
The airbag control unit uses a resistance
measurement to establish whether the seat belt is
fastened or not.
380_065
12
Occupant protection
Airbag
The Audi TT Coupé ‘07 has two-stage front airbags on the driver and front passenger sides.
The airbag control unit selects the time interval between the two ignition stages (approx. 5 ms to 30 ms)
according to severity and type of crash.
The loads acting on the driver or front passenger during an accident can be reduced through time-staggered
ignition of the propellant charges.
Both propellant charges are always ignited. This ensures that no propellant charge remains active after the
airbag is deployed.
Driver airbag
Airbag igniter I, driver side N95
Airbag igniter II, driver side N250
A gas generator with two pyrotechnic propellant charges is integrated in the driver's airbag.
Igniter I is activated electrically by the airbag control unit J234. The igniter flame passes through the container
and ignites the ignition charge in the container. If the pressure produced by the ignition of the ignition charge
is high enough, the flame will break through the container and reach the propellant charge through the
perforated tube. Propellant charge I ignites and combusts. The developing gas destroys the foil seal, and
filtered gas flows through the air outlet into the airbag. After a defined interval has expired, the airbag control
unit activates igniter II, which in turn ignites propellant charge II directly. The gas produced by combustion of
the propellant material flows through the raised end cap into the combustion chamber of propellant charge I.
From here the gas flows through the filter into the airbag.
380_003
Casing
Air outlet
Filter
Igniter I
Perforated tube
End cap
Ignition charge container
Propellant charge II
Igniter II
Filter
Foil seal
Air outlet
Foil seal
Propellant charge I
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