2008 AUDI TT ROADSTER sensor

......... _s_ a_ fe_ ty=-- b_ e _ lt_s ________________________________________________ _
Improperly worn safety belts
Incorrectly positioned safety belts can cause severe inju­
ries.
Wearing safety belts improperly can cause serious injury or
death. Safety belts can only work when they are correctly positioned on the body. Improper seating positions reduce
the effectiveness of safety belts and will even increase the
risk of injury and death by moving the safety belt to critical
areas of the body. Improper seating positions also increase
the risk of serious injury and death when an airbag deploys
and strikes an occupant who is not in the correct seating
position. A driver is responsible for the safety of all vehicle
occupants and especially for children. Therefore:
- Never permit anyone to assume an incorrect sitting posi­
tion in the vehicle while traveling~&.
& WARNING
Improperly worn safety belts increase the risk of serious personal
injury and death whenever a vehicle is being used.
• Always make sure that all vehicle occupants are correctly
restrained and stay in a correct seating position whenever the
vehicle is being used.
• Always read and heed all WARNINGS and other important infor­
mation =>
page 140. •
Safety belt tensioners
How safety belt pretensioners work
In front and side collisions above a particular severity,
safety belts in use are tensioned automatically.
The safety belts are equipped with safety belt pretensioners . The
system is activated by sensors in front and side collisions of great
severity . This tightens the belt and takes up belt slack=>&. in
"Service and disposal of safety belt pretensioner". Taking up the
slack helps to reduce forward occupant movement during a colli­
sion.
[ i] Tips
The safety belt pretensioner can only be activated once.
• In minor frontal and side collisions, in rear-end collisions, in a
rollover and in accidents involving very little impact force, the safety
belt pretensioner are not activated.
• When the safety belt pretensioner is activated, a fine dust is
released. This is normal and is not caused by a fire in the vehicle.
• The relevant safety requirements must be observed when the
vehicle or components of the system are scrapped . A qualified deal­
ership is familiar with these regulations and will be pleased to pass
on the information to you.
• Be sure to observe all safety, environmental and other regula ­
tions if the vehicle or individual parts of the system, particularly the
safety belt or airbag, are to be disposed. We recommend you have
your authorized Audi dealer perform this service for you. •

Airbag syst em -----------------=~-
& WARN ING (co ntinued)
• Make s ure th at the PA SSENGER AIR BAG OFF light come s on
a nd sta y s o n all the tim e whene ver the ign ition i s sw itched on . •
Advanced Airbag System components
The front passenger seat in your vehicle has a lot of very important
parts of the Advanced Airbag System in it. These parts inc lude the
weight -sensing mat, sensors, wiring, brackets, and more. The func ­
tion of the system in the front passenger seat is checked by the e lec ­
tronic contro l unit when the igni tion is on. The control unit monitors
the Advanced Airbag System and turns the airbag indicator light on
when a malfunction in the system components is detected . The
function of the airbag indicator light is described in greater detail
below. 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 for the front passenger seat from doing its job in a crash.
T he front A dvance d Airb ag Syst em con sis ts of th e
following:
• Crash sensors in the front of the vehicle that measure vehicle
acceleration/dece leration to prov ide 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 control unit "decides" whether to fire the
front airbags based on the information received from the crash sensors. The contro l unit a lso "decides" whether the safety belt
pretensioners should be activated .
• A dual -stage Advanced Airbag with gas generator for the driver
inside the steering wheel hub .
• A dual -stage Advanced Airbag and gas generator inside the
instrument pane l for the front passenger .
Controls and equip­
ment Safety first Vehicle operation
•
A weight -sensing mat under the upholstery padding of the front
passenger sea t cushion that measures the total weight on the seat .
The information registered is sent continuously to the e lectronic
control unit to regula te dep loyment of the front Advanced Airbag on
the passenger side.
• An airbag monitoring syste m and indica tor l ight in the instru ­
ment cluster=>
page 157.
• The PASSENGER AIR BAG OFF light comes on and stays on in the
center of the instrument panel=>
page 157, fig. 133 and tells you
when the front Advanced Airbag on the passenger side has been
turned off .
• A sensor be low the safety belt latch for the front seat passenger
to measure the tension on the safety belt . The tension on the safety
belt and the weight registered by the weight -se nsing mat help the
control unit "decide" whether the front airbag for the front
passenger sea t should be turned off o r not =>
page 147, "Child
restraints on the front seat -some important things to know" .
• A sensor in the safety belt latch for the dr iver and for the front
seat passenger that senses whether that safety be lt is latched or not
and t ransmits this information to the electronic control unit.
& WARNING
Damage to the front pa ssenger seat can prevent the front airbag
fr om worki ng properly .
• Improper repair or di sa ssembly of the front pa ssenger and
dri ver seat will prevent th e Adv an ced Airbag Sy stem from func­
tioning properly.
• Rep air s to the front p assenger seat must b e perfor med by qu al­
ified and properly tra ined work shop per sonnel .
• Never remo ve the fro nt pa ssenger or dr iver se at from the
v ehi cle.
• Nev er remove th e uphol stery from the fron t pass eng er seat.
• Never disas semble or r emove p arts from the seat or di sconne ct
wires from it . ..
Vehicle care Do-it-yourself service Technical data

Monitoring the Advanced Airbag
System
Airbag monitoring indicator light t!
Two separate indicators monitor the function of the
Advanced Airbag System: the airbag monitoring indica tor
light and the
PASSENGER AIR BAG OFF light.
The Advanced Airbag System (including the e lectronic control unit ,
sensor circu its and system w iring) is monitored cont inuously to
make sure that it is functioning proper ly whenever the ignition is on.
Each time you turn on the ignition, the airbag monitoring in dicator
light
r~ will come on for a few seconds (self diagnostics) .
The sy stem mu st be in spe cted wh en the ind icat or
light ~:
• does not come on when the ignition is switched on ,
• does not go out a few seconds after you have switched on the
ignit ion , or
• comes on whi le driving.
I f an airbag system malfunction is detected, the indicator light will
f irst start flashing to catch the driver 's attention and then stay on
continuously to serve as a constant reminder to have the system
inspected immediately .
I f a malfunction occurs that turns the front airbag on the passenger
side off , the
PAS SEN GER AIR BAG OFF light will come on and stay on
whenever the igni tion is on .
& WARNING
An airbag system that is not fun ctioning properly cannot provide
s upplementa l p rotect ion in a front al cr ash.
• If the airbag ind icator light come s on , it mean s that ther e m ay
be something wr ong with the Adv anced Airb ag S ystem . It i s
Safety first
Airb ag sy ste m
& W ARNING !continued )
possible t hat the airbag will inflate when it is not suppo sed to , or
will not infl ate w hen it should.
• Have the airb ag sys tem in spe cted immedi ate ly b y your Aud i
de aler. •
PASSENGER AIR BAG OFF light
)
Fig . 133 S ection from
th e instrum ent pa nel:
PASS ENGER AIR BAG
OFF light
The PASSENGER AIR BAG OFF ligh t is located in the center of the
ins trumen t panel
~ fig . 133.
The
PASSENGER AIR BAG OFF l ight will come on and stay on to tel l
you when the front Advanced Airbag on the passenger side has
been turned off by the electronic control unit. Each time you turn on
the ignition, the
PA SSE NGER AIR BAG OF F light wi ll flash for a few
seconds and :
• will stay on if the fron t passenger seat is not occupied,
• will stay on if there is a small child or child restraint on the front
passenger seat,
• will go out if the front passenger seat is occupied by an adult as
registered by the weigh t-sensing mat .
The
PA SSENGER AIR BAG OFF light mu st come on and stay on if the
ign ition is on and ._
Vehicle care I I irechnical data

___ A_ ir_ b_ a-g _ s_y _s_ t_ e_ m _________________________________________________ _
• a car bed has been installed on the front seat, or
• a rearward-facing child restraint has been installed on the front
passengerseat,or
• a forward-facing child restraint has been insta lled on the front
passenger seat, or
• the weight registered on the front passenger seat is equal to or
less than the combined weight of a typical 1 year -old restrained in
one of the rear-facing or forward-facing infant restraints listed in Federal Motor Vehicle Safety Standard 208 with which the Advanced
Airbag Sys tem in your vehicle was certified.
If the front passenger seat is not occupied, the front airbag wi ll not
deploy, and the
P ASS ENGER AIR B AG OFF light will stay on. Never
install a rearward -facing child restraint on the front passenger seat,
the safest place for a chi ld in any kind of child restraint is at one of
the seating positions on the rear seat=>
page 147, "Child restraints
on the front seat -some important things to know" and=>
page 168,
"Chi ld Safety" .
If the PA SS ENG ER A IR BAG OFF l ight com es on when one of the
conditions listed above is met, be sure to check the light regularly
to make certain that the
P ASSE NG ER AIR BAG OFF light stays on
continuously whenever the ignition is on. If the
PASSENGER AIR
B AG OFF
light does not appear and 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 and then turning
it on again;
• remove and re install the child restraint. Make sure that the chi ld
restraint is properly insta lled and that the safety belt for the front
passenger seat has been correct ly routed around the ch ild restraint
as described in the child restraint manufacturer's instructions;
• make sure that the convertible locking feature on the safety belt
for the front passenger seat has been activated and that the safety
belt has been pulled tight. The be lt must not be loose or have loops
of slack so that the sensor below the safety belt latch on the seat can
do its job=>
page 177 .
• make sure that things that may increase the weight of the child
and child safety seat are not being t ransported on the front
passenger seat;
• make sure that the safety belt tension sensor is no t blocked.
Shake the safety belt latch on the front passenger seat back and
forth;
• If a strap or tether is being used to tie the chi ld safety seat to the
front passenger seat, make sure that it is no t so tigh t that it causes
the weight -sensing mat to measure more weight than is actually on
t he seat .
If the PA SSEN GER AIR BAG OFF lig ht still doe s no t c om e on and does
not stay on continuously (when the ignition is switched on),
• t ake the child restraint off the front passenger seat and install it
proper ly at one of the rear seat positions. Have the airbag system
inspected by your Audi dealer immediately.
• move the child to a rear seat position and make sure that the
child is properly restrained in a child restra int that is appropriate for
its size and age .
T he
PASSENGER AIR BAG OFF light shou ld 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 O FF light
comes on and stays on or flashes for about 5 seconds wh ile driving,
under these circumstances, make sure that:
• the adu lt on the front passenger seat is properly seated on the
center of the seat cushion with his or her back up against the back­
rest and the backrest is not reclined=>
page 130, "Proper occupant
seating positions",
• t he adu lt 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 proper ly worn and that there is not a lot
of slack in the safety belt webbing,
• accessory seat covers or cushions or other things that may cause
an incorrect reading or impress ion on the weight-sensing mat ...

___ A_ ir_ b_ a-g _ s_y _s_ t_ e_ m _________________________________________________ _
Repair, care and disposal of the airbags
Parts of the airbag system are installed at many different places on
your Audi. Ins tal li n g, r em ovin g, s erv ic ing o r re pairi ng a part in an
area of the veh icle can damage a part of an a irbag system and
prev ent th at system from working pr oper ly in a c ollisio n.
There are some important things you have to know to make sure
that the effect ive ness of the system will not be impai red and that
discarded co mpone nts do not cause inju ry or po llute t he env iro n­
ment .
& WARNING
Improper care , servicing and repair procedures can increase the
r isk of personal injury and death by preventing an airbag from
deploying when needed or deploying an airbag unexpectedly:
• Never cover , obstruct , or change the steering wheel horn pad
or airbag cover or the instrument panel or modify them in any way.
• Never attach any objects such as cup holders or telephone
mountings to the surfaces covering the airbag units.
• For cle aning the horn pad or instrument panel , use only a soft ,
dry cloth or one moi stened 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 prop ­
erly .
• Never repair , adjust , or change any parts of the airbag system.
• All work on the steering wheel , instrument panel, front seats or
electrical system (including the installation of audio equipment ,
cellular telephones and CB radios, etc .} must be performed by a
qualified technician who has the training and spec ial equipment
ne cessary .
• For any work on the airbag system , we strongly recommend
that you see your authorized Audi dealer or qualified workshop .
• Never modify the front bumper or parts of the vehicle body.
& WARNING (continued)
• Always make sure that the side airbag can inflate without inter­
ference :
- Never install seat covers or replacement upholstery over the
front seatbacks that have not been specifically approved by
Audi .
- Never use addit ional seat cushions that cover the areas
where the side airbags inflate.
- 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 be activated only once . After an airbag
has inflated, it must be replaced by an authorized Audi dealer or
qualified technician who has the technical information , training
and special equipment necessary.
• The airbag sy stem can be deployed only once . After an airbag
has been deployed , it must be replaced with new replacement
parts designed 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 th at any airbag service action is entered in your Audi
Maintenance
& Warranty booklet under AIRBAG REPLACEMENT
RECORD .•
Other things that can affect Advanced Airbag
performance
Changing the vehic le 's suspension system can change the way that
th e A dva nced Ai rbag Sys te m p erform s in a c ras h. F or example,
using tire -rim combinations not approved by Audi, lowering the
ve hicle, c hanging the stiff ness of th e sus pensi on, in clud ing the
springs, suspens ion struts, shock absorbers etc . can chang e the
forces that a re measured by the airbag sensor s and sent to the e lec -
tronic control unit. Some suspension changes ca n, for example, .,_

increase the force levels measured by the sensors and ma ke the
a irbag sy ste m d eploy in crashes in which it wou ld not deploy if the
changes had no t been made . Other kinds of changes may reduce
the force levels measured by the sensors and prevent the airbag
from deploying when it should.
The sensors in the safety belt buckle for the driver and front
passenger seat te ll the electronic control module i f the safety belt is
latched or not. If the safety belt is being used, the front airbag will
deploy at a sligh tly h igher rate of vehic le d ece leration than if the
safety belt is not being used. Therefore , in a particular co llision , it is
possible that an ai rbag will not deploy at a seating position where
the safety belt is being used but will inflate at the posi tion where the
safety belt is not being used . It is important tha t nothing interfere
with the safety belt buckles so t hat the sensors can send the co rrect
information about safe ty belt use to the elec tronic control unit.
& WARNING
Changing the vehicle's suspen sion including use of unapproved
tire -rim combinations can change Advan ced Airbag performan ce
and in crease the risk of serious personal injury in a cra sh.
• Never in stall su spen sion compone nts that do not have the
same performance characteristics as the components originally
in stalled on your vehi cle.
• Never use tire -rim combination s that have not been approved
by Audi.
& WARNING
Items stored between the safety belt bu ckle and the center
console can cau se the sen so rs in the buckle to send the wrong
inform ation to the ele ctron ic control module and prevent the
Advanced Airbag System from working properly .
• Always make sure that nothing can interfere with th e safety
belt buckle s and that they are not obstructed.
Safety first
Airbag sy ste m
ffi For the sake of the environment
Undeployed airbag modu les and pretensioners might be classified
as Perchlorate Material -specia l handling may apply, see
www.dtsc .ca.gov/hazardouswaste/perchlorate. When the vehicle or
parts of the restraint system including airbag modules safety belts
with prete nsioners are scrapped, all appl icable laws and regu la­
tions must be observed . Your au thori zed Audi dealer is familiar wi th
t hese requirements a nd we rec ommend that y ou have your dea ler
perform this service for you. •
Knee airbags
Description of knee airbags
The air bag system can pr ovide supplemen tal pr otec tio n
to pro perly restrained fron t seat occupants.
Fi g. 13 4 D rive r's
airba g
The ai rbag for the driver is located in the instrument panel under ­
neath the steering wheel:=:, fig. 134 , the airbag for the passenger is
at about the same height in the instrum ent panel underneath the
glove compartment.
T he knee airbag offers add itional protection to the driver 's and
p assenger 's knees and upper and lower thigh areas as a supple -
ment to the safety belts . •
Vehicle care I I irechnical data

belts, not just because the law requires you to do so=> page 137,
"General notes" .
It is important to remember that while the supplemental side airbag
system is designed to reduce the likelihood of serious injuries, other
injuries, for example, swelling, bruising, and minor abrasions can
also be associated with deployed side airbag .s. Remember too, side
airbags wil l deploy only once and on ly in certain kinds of accidents
- your safety belts are a lways there to offer protection.
Vehicle damage, repair costs or even the lack of vehicle damage are not necessarily an indication of over -sensitive or failed airbag acti­
vation. In some collisions, both front and s ide airbags may inflate .
Remember too , that airbags will deploy only once and only in
certain kinds of collisions - 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 .
The s ide a ir ba g sy stem will not dep loy:
• when the ignition is turned off
• in side coll isions when the acce leration measured by the sensor
is too low
• in front -end collisions
• in rear -end collisions
• in rollovers.
In some types of accidents the front airbags and side airbags may
be triggered together.
& WARNING
• Safet y belt s a nd the airbag sy stem will only provid e prote ct ion
w hen o ccupants ar e in the proper s eating p osition
=> page 16 6.
• If the airbag indicat or light come s on when the vehicle i s being
u sed , have the system in sp ec ted imm ediatel y by your authori zed
Audi de aler . Th e airb ag m ay not work properly when the vehicle
a ccel era tion in a side c olli sio n is high enough to a ctiv ate th e
airb ag .•
Safety first
Airbag sy ste m
How supplemental s ide airbags work
Side airbags deploy instantly and can help reduce the risk
of upper torso injuries for occupants who are properly
restrained .
Fig. 137 Infl ate d side
airb ags on left sid e o f
ve hicle
When the system is triggered , the airbag is fi lled with propellant gas
and brea ks through a seam in the seat surface area marked
"AIRBAG" . It expands between the side trim pane l and the
passenger. In order to help provide this additional protection, the
s ide a irbag must inflate within a fraction of a second at very h igh
speed and with great force. The supp lemental side airbag could
injure you if your seat ing position is not proper or upright or if items
are located in the area where the supplemental side airbag expands.
This applies especially to children =>
page 168, "Child Safe ty" .
Supp lemental side airbags inflate between the occupant and the
door panel on the side of the vehicle that is struck in certain side
collision=> fig. 137.
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 upper
part of the body .
A fine dust may develop when the airbag deploys . This is normal
and does not mean there is a fire in the vehicle. •
Vehicle care I I Technical data

__________________________________________________ A_ i_ r _b _a...; g::- s_ y=--- s_t _e _m __ ,n
& WARNING (continued)
• In a side collision, side airbags will not function properly if
sensors cannot correctly measure increasing air pressure inside
the doors when air escapes through larger, unclosed openings in
the door panel.
-Never drive with interior door trim panels removed.
- Never drive when parts have been removed from the inside
door panel and the openings they leave have not been properly
closed .
- Never drive when loudspeakers in the doors have been
removed unless the speaker holes have been properly closed.
- Always make certain that openings are covered or filled if additional speakers or other equipment is installed in the
inside door panels.
- Always have work on the doors done by an authorized Audi
dealer or qualified workshop. •
Controls and equip­ ment Safety first
Vehicle operation Vehicle care Do-it-yourself service Technical data