2019 AUDI TT ROADSTER ignition

Airbag system


ZA WARNING
If, in exceptional circumstances, you must in-
stall a forward-facing child restraint on the
front passenger's seat:
— Always make sure the forward-facing seat
has been designed and certified by its manu-
facturer for use on a front seat with a pas-
senger front and side airbag.
— Never put the forward-facing child restraint
up against or very near the instrument pan-
el.
— Always move the front passenger seat to the
highest position in the up and down adjust-
ment range and move it back to the rear-
most position in the seat's fore and aft ad-
justment range, as far away from the airbag
as possible, before installing the forward-
facing child restraint.
— Always make sure that the safety belt upper
anchorage is behind the child restraint and
not next to or in front of the child restraint
so that the safety belt will be properly posi-
tioned.
— Make sure that the PASSENGER AIR BAG
OFF 7; light comes on and stays on all the
time whenever the ignition is switched on.

— Improper installation of child restraints can
reduce their effectiveness or even prevent
them from providing any protection.
— An improperly installed child restraint can
interfere with the airbag as it deploys and
seriously
injure or even kill the child - even
with an Advanced Airbag System.
— Always carefully follow the manufacturer's
instructions provided with the child seat or
carrier.
— Always make sure that there is nothing on
the front passenger seat that will cause the
capacitive passenger detection system in
the seat to signal to the Airbag System that
the seat is occupied by a person when it is
not, or to signal that it is occupied by some-
one who is heavier than the person actually
sitting on the seat. The presence of addi-
tional objects could cause the passenger
front airbag to be turned on when it should
be off, or could cause the airbag to work ina
way that is different from the way it would
have worked without the object on the seat.



ZA WARNING
To reduce the risk of serious injury, make sure
that the PASSENGER AIR BAG OFF 3; light
will be displayed whenever a child restraint is
installed on the front passenger seat and the
ignition is switched on.
— If the PASSENGER AIR BAG OFF %; light
does not stay on, perform the checks descri-
bed > page 200, Monitoring the Advanced
Airbag System.
— Have the airbag system inspected by your
Audi dealer immediately.
— Always carefully follow instructions from
child restraint manufacturers when instal-
ling child restraints.

ZA WARNING
If, in exceptional circumstances, you must in-
stall a forward or rearward-facing child re-
straint on the front passenger's seat:

192

Airbag system


— Always make sure that the safety belt upper
anchorage is behind the child restraint and
not next to or in front of the child restraint
so that the safety belt will be properly posi-
tioned.
— Always make sure that there is nothing on
the front passenger seat that will cause the
capacitive passenger detection system in
the seat to signal to the Airbag System that
the
seat is occupied by a person when it is
not, or to signal that it is occupied by some-
one who is heavier than the person actually
sitting on the seat. The presence of addi-
tional objects could cause the passenger
front airbag to be turned on when it should
be off, or could cause the airbag to work ina
way that is different from the way it would
have worked without the object on the seat.
— Make sure that the PASSENGER AIR BAG
OFF 7%; light comes on and stays on all the
time whenever the ignition is switched on.
PET ew elem me eae
The front passenger seat in your vehicle has a lot
of very important parts of the Advanced Airbag
System in it. These parts include the capacitive
passenger detection system, wiring, brackets,
and more. The control unit monitors the system
on the front passenger seat when the ignition is
switched on and turns the airbag indicator light
on when a malfunction in the one of the system
components is detected > page 200. Because the
front passenger seat contains important parts of
the Advanced Airbag System, you must take care
to prevent it from being damaged. Damage to
the seat may prevent the Advanced Airbag Sys-
tem for the front passenger seat from doing its
job ina crash.

The front Advanced Airbag System consists
of the following:
— Crash sensors in the front of the vehicle that
measure vehicle acceleration/deceleration to
provide information to the Advanced Airbag
System about the severity of the crash.
— An electronic control unit, with integrated
crash sensors for front and side impacts. The
196
control unit “decides” whether to fire the front
airbags based on the information received from
the crash sensors. The control unit also “de-
cides” whether the safety belt pretensioners
should be activated.
— An Advanced Airbag with gas generator for the
driver inside the steering wheel hub.
— An Advanced Airbag with gas generator inside
the instrument panel for the front passenger.
— A capacitive passenger detection system under-
neath the front passenger seat cover. This sys-
tem measures the electrical capacitance of the
person in the seat. The information registered
is sent continuously to the electronic control
unit to regulate deployment of the front Ad-
vanced Airbag on the passenger side.
— An airbag monitoring system and indicator
light Ea in the instrument cluster.
—Asensor in each front seat registers the dis-
tance between the respective seat and the
steering wheel or instrument panel. The infor-
mation registered is sent continuously to the
electronic control unit to regulate deployment
of the front Advanced Airbags.
— The PASSENGER AIR BAG OFF #%; light comes
on and stays on in the headliner > page 200,
fig. 158 and tells you when the front Advanced
Airbag on the passenger side has been turned
off.
—Asensor in the safety belt latch for the driver
and for the front seat passenger that senses
whether that safety belt is latched or not and
transmits this information to the electronic
control unit.

ZA WARNING
Damage to the front passenger seat can pre-
vent the front airbag from working properly.
— Improper repair or disassembly of the front
passenger and driver seat will prevent the
Advanced Airbag System from functioning
properly.
— Repairs to the front passenger seat must be
performed by qualified and properly trained
workshop personnel.
— Never remove the front passenger or driver
seat from the vehicle. >

Airbag system

Deployment of the Advanced Airbag System and
the activation of the safety belt pretensioners de-
pend on the deceleration measured by the crash
sensors and registered by the electronic control
unit. Crash severity depends on speed and decel-
eration as well as the mass and stiffness of the
vehicle or object involved in the crash.
On the passenger side, regardless of safety belt
use,
the front passenger frontal airbag will be
turned off if the electrical capacitance measured
by the capacitive passenger detection system on
the front passenger seat is less than the amount
programmed in the electronic control unit. The
front passenger frontal airbag will also be turned
off if the capacitance measured by the system for
the front passenger seat equals that of an infant
of about one year of age in one of the child seats
that was used to certify the Advanced Airbag Sys-
tem under Federal Motor Vehicle Safety Standard
208. The PASSENGER AIR BAG OFF #; light
comes on and stays on to tell you when the front
Advanced Airbag System on the passenger side
has been turned off > page 200.

Z\ WARNING
To reduce the risk of injury when an airbag in-
flates, always wear safety belts properly.
— If you are unrestrained, leaning forward, sit-
ting sideways or out of position in any way,
your risk of injury is much higher.
— You will also receive serious injuries and
could even be killed if you are up against the
airbag or too close to it when it inflates -
even with an Advanced Airbag > page 189.
More important things to know about front
airbags



g
e
z &

Fig. 157 Inflated front airbags
198
Safety belts are important to help keep front seat
occupants in the proper seated position so that
airbags can unfold properly and provide supple-
mental protection in a frontal collision.
The front airbags are designed to provide addi-
tional protection for the chest and face of the
driver and the front seat passenger when:
— safety belts are worn properly,
— the seats have been positioned so that the oc-
cupant is properly seated as far as possible
from the airbag.
Because airbags inflate in the blink of an eye with
great force, things you have on your lap or have
placed on the seat could become dangerous pro-
jectiles, and be pushed into you if the airbag in-
flates.
When an airbag deploys, fine dust is released.
This is normal and is not caused by a fire in the
vehicle. This dust is made up mostly of a powder
used to lubricate the airbags as they deploy. It
could irritate skin.
It is important to remember that while the sup-
plemental airbag system is designed to reduce
the likelihood of serious injuries, other injuries,
for example swelling, bruising and minor abra-
sions, can also happen when airbags inflate. Air-
bags do not protect the arms or the lower parts
of the body. Front airbags supplement the three
point safety belts only in some frontal collisions
in which the vehicle deceleration is high enough
to deploy the airbags.
Front airbags will not deploy:
— if the ignition is switched off when a crash oc-
curs,
— in side collisions,
—in rear-end collisions,
—in rollovers,
— when the crash deceleration measured by the
airbag system is less than the minimum thresh-
old needed for airbag deployment as registered
by the electronic control unit.
The front passenger airbag will also not
deploy:
—when the front passenger seat is not occupied, >

Airbag system


sitting on the seat. The presence of an ob-
ject could cause the passenger front airbag
to be turned on when it should be off, or
could cause the airbag to work in a way that
is different from the way it would have
worked without the object on the seat.

ZX WARNING
The fine dust created when airbags deploy can
cause breathing problems for people with a
history of asthma or other breathing condi-
tions.
—To reduce the risk of breathing problems,
those with asthma or other respiratory con-
ditions should get fresh air right away by
getting out of the vehicle or opening win-
dows or doors.
— Ifyou are in a collision in which airbags de-
ploy,
wash your hands and face with mild
soap and water before eating.
— Be careful not to get the dust into your eyes,
or into any cuts or scratches.
— If the residue should get into your eyes,
flush them with water.

Monitoring the
Advanced Airbag System
Airbag monitoring indicator light
Two separate indicators monitor the function of
the Advanced Airbag System: the 2] light and
the PASSENGER AIR BAG OFF 4; ON @ light.
The Advanced Airbag System as well as the side
airbags with ejection mitigation features (includ-
ing the electronic control unit, sensors and sys-
tem wiring) are all monitored continuously to
make sure that they are functioning properly
whenever the ignition is on. Every time you turn
on the ignition, the airbag system indicator light
B¥ will come on for a few seconds (function
check).
The system must be inspected when the
indicator light Ba:
— does not come on when the ignition is switched
on,
200
— does not go out a few seconds after you have
switched on the ignition, or
— comes on while driving.
If an airbag system malfunction is detected, the
indicator light will come on to serve as a constant
reminder to have the system inspected immedi-
ately.
If a malfunction occurs that turns the front air-
bag on the passenger side off, the PASSENGER
AIR BAG OFF 8%; light will come on and stay on
whenever the ignition is on.

Z\ WARNING
An airbag system that is not functioning prop-
erly cannot provide supplemental protection
in a frontal crash.
— If the airbag indicator light > page 18
comes when the vehicle is being used, have
the system inspected immediately by your
authorized Audi dealer. It is possible that
the airbag will inflate when it is not sup-
posed to, or will not inflate when it should.

PASS eae VNR) de ALO) MU Lig


Fig. 158 Section from the headliner: PASSENGER AIR BAG
OFF 2%; ON @ light
The PASSENGER AIR BAG OFF %; ON @ light is
located in the headliner > fig. 158.
The PASSENGER AIR BAG OFF %; light will come
on and stay on to tell you when the front Ad-
vanced Airbag on the passenger side has been
turned off by the electronic control unit. If the
bulb for the PASSENGER AIR BAG OFF #%; ON @
light burns out, the airbag indicator light ka will
come on to signal a malfunction in the Advanced
Airbag System. Although the burned-out bulb >

8S8012721BA
Airbag system

will not change the way the front passenger's
frontal airbag works, it will no longer be possible
to use the PASSENGER AIR BAG OFF %; ON @
light to make sure that the airbag on/off status is
correct for the occupant on the front passenger
seat. Have the airbag system inspected immedi-
ately by your authorized Audi dealer.
The PASSENGER AIR BAG OFF 3%; ON @ light
will blink for about 5 seconds when:
— the capacitive passenger detection system,
which switches the front seat passenger's fron-
tal Advanced Airbag on and off, detects a
change in the status of the front passenger
seat.
As soon as the PASSENGER AIR BAG OFF 7¥; ON
® light stops blinking, always make sure that the
airbag status (on or off) as shown by the light is
proper for the age, size and electrical capacitance
of the person occupying the front passenger seat.
Always make sure that the safety belt for the
front passenger seat is properly fastened.
The PASSENGER AIR BAG OFF %¥; / PASSENGER
AIR BAG ON @ light will show the status of the
front seat passenger's frontal Advanced Airbag.
The PASSENGER AIR BAG OFF %; light:
—will come on if the front passenger seat is not
occupied;
— will come on if the electrical capacitance meas-
ured by the capacitive passenger detection sys-
tem for the front passenger seat equals the
combined capacitance of an infant up to about
one year of age and one of the rearward-facing
or forward-facing child restraints listed in Fed-
eral Motor Vehicle Safety Standard 208 with
which the Advanced Airbag System in your vehi-
cle was certified; For a listing of the child re-
straints that were used to certify your vehicle's
compliance with the U.S. Safety Standard
> page 212.
— will go out if the front passenger seat is occu-
pied by an adult as registered by the capacitive
passenger detection system.
— The PASSENGER AIR BAG OFF #; light must
come on and stay on if the ignition is on and...
—acar bed has been installed on the front pas-
senger seat, or
—arearward-facing child restraint has been in-
stalled on the front passenger seat, or
—a forward-facing child restraint has been instal-
led on the front passenger seat,
—and if the electrical capacitance registered on
the front passenger seat is equal to or less than
the combined capacitance of a typical 1 year-
old infant and one of the rearward-facing or
forward-facing child restraints listed in Federal
Motor Vehicle Safety Standard 208 with which
the Advanced Airbag System in your vehicle was
certified.
If the front passenger seat is not occupied, the
front airbag will not deploy, and the PASSENGER
AIR BAG OFF 3; light will stay on.
Never install a rearward-facing child restraint on
the front passenger seat > page 190, Child re-
straints on the front seat - some important
things to know and & page 210, Child safety.
If the PASSENGER AIR BAG OFF #; light
comes on...
If the PASSENGER AIR BAG OFF 3%; light comes
on when one of the conditions listed above is
met, be sure to check the light regularly to make
certain that the PASSENGER AIR BAG OFF #;
light stays on continuously whenever the ignition
is on. If the PASSENGER AIR BAG OFF %; light
does not appear on and does not stay on all the
time, stop as soon as it is safe to do so and
— reactivate the system by turning the ignition off
for more than 4 seconds and then turning it on
again;
— remove and reinstall the child restraint. Make
sure that the child restraint is properly installed
and that the safety belt for the front passenger
seat has been correctly routed through the
child restraint as described in the child restraint
manufacturer's instructions;
— make sure that the convertible locking retractor
on the safety belt for the front passenger seat
has been activated and that the safety belt has
been pulled tight.
— make sure that no electrical device (such as a
laptop, CD player, electronic games device,
power inverter or seat heater for child seats) is
placed or used on the front passenger seat if
201
>

Airbag system

the device is connected to the 12-volt socket or
the cigarette lighter socket;
— make sure that no seat heater has been retrofit-
ted or otherwise added to the front passenger
seat;
— make sure that nothing can interfere with the
safety belt buckles and that they are not ob-
structed;
— make sure that there are no wet objects (such
as a wet towel) and no water or other liquids on
the front passenger seat cushion.
If the PASSENGER AIR BAG OFF &; light still
does not come on...
If the PASSENGER AIR BAG OFF 3, light still
does not come on and does not stay on continu-
ously (when the ignition is switched on),
— take the child restraint off the front passenger
seat and have the airbag system inspected by
your Audi dealer immediately.
The PASSENGER AIR BAG OFF 3; light
should NOT come on...
The PASSENGER AIR BAG OFF 3%; light should
NOT come on when the ignition is on and an adult
is sitting in a proper seating position on the front
passenger seat. If the PASSENGER AIR BAG OFF
#¥; light comes on and stays on while driving, un-
der these circumstances, make sure that:
— the adult on the front passenger seat is proper-
ly seated on the center of the seat cushion with
his or her back up against the backrest and the
backrest is not reclined,
— the adult is not taking weight off the seat by
holding on to the passenger assist handle
above the front passenger door or supporting
their weight on the armrest,
— the safety belt is being properly worn and that
there is not a lot of slack in the safety belt web-
bing,
— there are no aftermarket seat covers or cush-
ions or other things (such as blankets) on the
front passenger seat that might cause the ca-
pacitive passenger detection system to miscal-
culate electrical capacitance.
202
Important safety instructions on
monitoring the Advanced Airbag System
ZA WARNING
— If the status of the Advanced Airbag System
has changed while the vehicle is moving, the
PASSENGER AIR BAG OFF #¥; ON ® light
blinks for about 5 seconds to catch the driv-
er's attention. If this happens, always stop
as soon as it is safe to do so and check the
steps described above.
— If the PASSENGER AIR BAG OFF %; light
does not go off when an adult who is not
very small is sitting on the front passenger
seat after taking the steps described above,
have the airbag system inspected by your
authorized Audi dealer before transporting
anyone on the front passenger seat.

ZA WARNING
An airbag system that is not functioning prop-
erly cannot provide supplemental protection
in a frontal crash.
— If the airbag indicator light > page 18
comes when the vehicle is being used, have
the system inspected immediately by your
authorized Audi dealer. It is possible that
the airbag will inflate when it is not sup-
posed to, or will not inflate when it should.

ZA\ WARNING
If the front airbag inflates, a child without a
child restraint, or in a rearward-facing child
safety seat, or in a forward-facing child re-
straint that has not been properly installed
will be seriously injured and can be killed.
— If you must install a rearward-facing child
seat on the front passenger seat because of
exceptional circumstances and the PASSEN-
GER AIR BAG OFF #¥; light does not appear
and stay on, have the airbag system inspect-
ed by your Audi dealer.
— If, in exceptional circumstances, you must
install a forward-facing child restraint on
the front passenger seat, always move the
seat into its rearmost position in the seat's
fore and aft adjustment range, as far away

8S8012721BA
Airbag system


from the airbag as possible. The backrest
must be adjusted to an upright position.
Make sure that the PASSENGER AIR BAG
OFF %; light comes on and stays on all the
time whenever the ignition is switched on.


ZA WARNING
If the PASSENGER AIR BAG OFF %; light does
not go out when an adult is sitting on the
front passenger seat after taking the steps
described above, have the airbag system in-
spected by your Audi dealer before transport-
ing anyone on the front passenger seat.

@ Tips
If the capacitive passenger detection system
determines that the front passenger seat is
empty, the frontal airbag on the passenger
side will be turned off, and the PASSENGER
AIR BAG OFF 3; light will stay on.
Repair, care and disposal of the airbags
Parts of the airbag system are installed at many
different places on your Audi. Installing, remov-
ing, servicing or repairing a part in an area of the
vehicle can damage a part of an airbag system
and prevent that system from working properly
in a collision.
There are some important things you have to
know to make sure that the effectiveness of the
system will not be impaired and that discarded
components do not cause injury or pollute the
environment.

ZA WARNING
Improper care, servicing and repair proce-
dures can increase the risk of personal injury
and death by preventing an airbag from de-
ploying when needed or deploying an airbag
unexpectedly:
— Never cover, obstruct, or change the steer-
ing wheel horn pad or airbag cover or the in-
strument panel or modify them in any way.
— Never attach any objects such as cup holders
or telephone mountings to the surfaces cov-
ering the airbag units.


— For cleaning the horn pad or instrument
panel, use only a soft, dry cloth or one mois-
tened with plain water. Solvents or cleaners
could damage the airbag cover or change
the stiffness or strength of the material so
that the airbag cannot deploy and protect
properly.
— Never repair, adjust, or change any parts of
the airbag system.
— All work on the steering wheel, instrument
panel, front seats or electrical system (in-
cluding the installation of audio equipment,
cellular telephones and CB radios, etc.)
must be performed by a qualified technician
who has the training and special equipment
necessary.
— For any work on the airbag system, we
strongly recommend that you see your au-
thorized Audi dealer or qualified workshop.
— Never modify the front bumper or parts of
the vehicle body.
— Always make sure that the side airbag can
inflate
without interference:
— Never install seat covers or replacement
upholstery over the front seatbacks that
have not been specifically approved by Au-
di.
— Never use additional seat cushions that
cover the areas where the side airbags in-
flate.
— Damage to the original seat covers or to
the seam in the area of the side airbag
module must always be repaired immedi-
ately by an authorized Audi dealer.
— The airbag system can deploy only once. Af-
ter an airbag has been deployed, it must be
replaced with new replacement parts de-
signed and approved especially for your Audi
model version. Replacement of complete
airbag systems or airbag components must
be performed by qualified workshops only.
Make sure that any airbag service action is
entered in your Audi Warranty & Mainte-
nance booklet under AIRBAG REPLACEMENT
RECORD.
— For safety reasons in severe accidents, the
alternator and starter are separated from


203

8S58012721BA
Airbag system

Remember too, airbags will deploy only once and
only in certain kinds of accidents - your safety
belts are always there to offer protection in those
accidents in which airbags are not supposed to
deploy or when they have already deployed, for
example when your vehicle strikes or is struck by
another after the first collision.
This is just one of the reasons why an airbag is
not a substitute for the safety belt. The airbag
system works most effectively when used with
the safety belts. Therefore, always wear your
safety belts correctly.
It is important to remember that while the sup-
plemental knee airbag system is designed to re-
duce the likelihood of serious injuries, other inju-
ries, for example, swelling, bruising and minor
abrasions and friction burns can also occur when
an airbag inflates.
The knee airbag system basically consists of:
— The electronic control module
— Two inflatable airbags (airbag and gas genera-
tor), one for the driver and one for the front
Passenger
— The airbag warning light in the instrument clus-
ter
The knee airbag system will not deploy:
— when the ignition is switched off
— in frontal collisions when the deceleration
measured by the control unit is too low
— in side collisions
—in rear-end collisions
—in rollovers
— in the event of a system malfunction (warning/
indicator light is on) > page 18.


Z\ WARNING
— Safety belts and the airbag system can only
provide protection when occupants are in
the proper seating position > page 198.
— If the airbag indicator light > page 18
comes when the vehicle is being used, have
the system inspected immediately by your
authorized Audi dealer. It is possible that
the airbag will inflate when it is not sup-
posed to, or will not inflate when it should.

aati S1e Rel
The risk of injury to the leg area can be reduced
by fully inflated knee airbags.
> 8 e z S
>...
Fig. 160 Inflated airbags protecting in a frontal collision

The knee airbag system has been designed so
that the airbags for the driver and front passen-
ger deploy in certain but not all frontal collisions.
If the front airbags deploy, the knee airbags also
deploy in frontal collisions when the deployment
threshold stored in the control unit is met.
When the system deploys, the airbags fill with a
propellant gas, and inflate between the lower
part of the instrument panel and the driver and
the lower part of the instrument panel and the
front passenger > page 198, fig. 157.
Although they are not a soft pillow, they can
“cushion” the impact and in this way they can
help to reduce the risk of injury to the lower ex-
tremities.
All of this takes place in the blink of an eye, so
fast that many people don't even realize that the
airbags have deployed. The airbags also inflate
with a great deal of force and it is important for
occupant safety that nothing should be in their
way when they deploy.
Fully inflated airbags in combination with proper-
ly worn safety belts slow down and limit the oc-
cupant's forward movement and help to reduce
the risk of injury.
205