belt AUDI A8 2012 Owner's Guide

146 Airbag system
-An improperly installed child restraint
can interfere with the airbag as it de ­
ploys and seriously injure or even kill the
child -even with an Advanced Airbag
System .
- Always carefully follow the manufactur­
er's instructions provided with the child
seat or carrier .
- Never place additional items on the seat
that can increase the total weight regis­ tered by the weight-sensing mat and can
cause injury in a crash .
Front airbags
Description of front airbags
The airbag system con provide supplemental
protect ion to properly restrained front seat
occupants.
Fig. 145 Location of dr iver airbag: in stee ring wheel
Fig. 146 Locat ion of front passenger's airbag: in the in­
s trument panel
Your vehicle is equipped with an "Advanced
A irbag System" in compliance with United
States Federal Motor Vehicle Safety Standard
(FMVSS) 208 as applicable at the time you r
vehicle was manufactured. The system senses
the position of the front seats and controls
front airbag inflation with a valve, depending on
the distance between the respective seat
and the steering wheel or instrument panel.
The safety belts for the seats have "preten­ sioners" that help to take slack out of the belt
system. The pretensioners are also activated by the electronic control unit for the airbag
system.
The front safety belts also have load limiters
to help reduce the forces applied to the body in a crash .
The airbag for the driver is in the steering
wheel hub
c::;, fig. 145 and the airbag for the
front passenge r is in the instrument panel
c::;, fig . 146 . The general location of the airbags
is marked "AIRBAG".
There is a lot you need to know about the air­
bags in your vehicle. We urge you to read the
detailed information about airbags, safety
belts and child safety in this and the other
chapters that make up the owner's literature .
Please be sure to heed the WARNINGS -they
are extremely important for your safety and
the safety of you r passengers, especially in­
fants and small children.
A WARNING
Never rely on airbags alone for protection.
- Even when they deploy, airbags provide
only supplementa l protection .
-Airbag work most effectively when used
with properly worn safety belts.
- Therefore, always wear your safety belts
and make sure that everybody in your ve ­
hicle is properly restrained .
A WARNING
A person on the front passenger seat , es­
pecially infants and sma ll children, will re­
ceive serious injuries and can even be kil­
led by being too close to the airbag when
it inflates .
- Although the Advanced Airbag System in
your vehicle is designed to turn off the
front passenger airbag if an infant or a
small child is on the front passenger
seat, nobody can absolutely guarantee ..,.

that deployment under these special
conditions is impossible in all conceiva­
ble situations that may happen during
the useful life of your vehicle .
- The Advanced Airbag System can deploy
in accordance with the "low risk" option
under the U .S . Federal Standard if a child
that is heavier than the typical one-year old child is on the front passenger seat
and the other conditions for airbag de­
ployment are met .
- Accident statistics have shown that chil­
dren are generally safer in the rear seat
area than in the front seating position.
- For their own safety, all children, espe­
cially 12 years and younger, should al­
ways ride in the back properly restrained
for their age and size.
Advanced front airbag system
Your vehicle is equipped with a front Advanced
Airbag System in compliance with United
States Federal Motor Vehicle Safety Standard
208 as applicable at the time your vehicle was
manufactured .
T he front Advanced Airbag System supple­
ments the safety belts to provide additional
protection for the driver's and front passeng­
er's heads and upper bodies in frontal crashes .
The airbags inflate only in frontal impacts
when the vehicle deceleration is high enough.
The front Advanced Airbag System for the
front seat occupants is not a substitute for
your safety belts . Rather, it is part of the over­
all occupant restraint system in your vehicle .
Always remember that the airbag system can
only help to protect you, if you are sitting up­
right , wearing your safety belt and wearing it
properly. This is why you and your passengers
must always be properly restrained , not just
because the law requires you to be.
The Advanced Airbag System in your vehicle has been certified to meet the "low risk" re­
quirements for 3 and 6 year-old children on
the passenger side and very small adults on
the driver side. The low risk deployment crite-
Airbag system 147
ria are intended to help reduce the risk of in­
jury through interaction with the front airbag that can occur, for example, by being too
close to the steering wheel and instrument
panel when the airbag inflates.
In addition, the system has been certified to
comply with the "suppression" requirements
of the Safety Standard, to turn off the front
airbag for infants 12 months old and younger
who are restrained on the front passenger
seat in child restraints that are listed in the
Standard
¢ page 168, Child restraints and
Advanced Airbags.
"Suppression" requires the front airbag on the
passenger side to be turned off if:
- a child up to about one year of age is re­
strained on the front passenger seat in one
of the rear -facing or forward-facing infant
restraints listed in Federal Motor Vehicle
Safety Standard 208 with which the Ad­
vanced Airbag System in your vehicle was
certified . For a listing of the child restraints
that were used to certify your vehicle's com­
pliance with the US Safety Standard
¢page 168,
-weight less than a threshold level stored in
the control unit is detected on the front pas­
senger seat.
When a person is detected on the front pas­
senger seat, weighing more than the total
weight of a child that is about 1 year old re­
strained in one of the rear-facing or forward­
facing infant restraints (listed in Federal Mo­
tor Vehicle Safety Standard 208 with which
the Advanced Airbag System in your vehicle
was certified), the front airbag on the passen ­
ger side may or may not deploy.
The
PASSENGER AIR BAG OFF light comes on
when the electronic control unit detects a to­
tal weight on the front passenger seat that re ­
quires the front airbag to be turned off. If the
PASSENGER AIR BAG OFF light does not
come on, the front airbag on the passenger
side has not been turned off by the control
unit and can deploy if the control unit senses
11-
•
•

-Always make sure the forward-facing
seat has been des igned and certified by
its manufacturer for use on a front seat
with a passenger front and side airbag.
- Never put the forward-facing child re­
straint up aga inst or very near the instru­
ment panel.
- Always move the passenger seat into its
rearmost position in the seat's fore and
aft adjustment range, as far away from
the a irbag as poss ible, before insta lling
the fo rward -facing child restraint. T he
b ackres t m ust be adjus ted to an upr igh t
posit ion.
- Make su re that the
PASSENGER AIR BAG
OFF
light comes on and s tays on all the
t ime whenever the ignition is switched
on .
Advanced Airbag System components
The front passenger seat in your vehicle has a
l ot of very important parts of the Advanced
Airbag System in it. These parts include the
weight-sens ing mat, sensors, wiring, brack­
ets, and more . The function of the system in
the front passenger seat is checked by the
e lectronic control un it when the ign it ion is on .
The control un it mon itors the Advance d Air ­
bag Sys tem and turn s the a irbag i ndica tor
light on when a ma lfunction in t he system
compo nents is detected . The function of the
ai rbag indicator light is described in greater
deta il below. Because the front passenger
seat contains important parts of the Ad­
va nced A irbag System, you must take care to
prevent it from being damaged . Damage to
the seat may p revent the Advanced A irbag for
the front passenger seat from doing its job in
a crash .
The front Advanced Airb ag System
consists of the following:
- Crash senso rs in the front of the veh icle that
measu re ve hicle accelera tion/decele ra ti on
to provide info rm ation to the Advanced Air ­
bag System abo ut the severity of the crash.
A irbag system 149
-An elect ron ic cont ro l unit, with integrated
crash sensors for front and side impacts .
The control un it "decides" whether to f ire
the front a irbags based on the informat ion
received from the crash sensors. The control
unit also "decides" whether the safety belt
prete nsione rs shou ld be act iva ted.
- An Advanced A irbag w it h gas generator and
cont ro l valve for the d river ins ide the steer ­
ing wheel h ub.
- An Advanced A irbag w ith gas generator and
cont ro l valve inside the instrument pa ne l for
the front passenger .
- A weight -sensing mat unde r the upho lstery
padding of the front passenge r seat cushion
that measures the to tal weight o n the seat.
The info rmat ion reg iste red is sent continu­
ously to the elect ronic con trol u nit to regu ­
la te deployment of the front Advanced Air ­
bag on the passenger side .
- An airbag moni tor ing sys tem and ind icator
light in the instr ument cluster
¢ page 153.
-A sen sor in each fron t seat regis ters the dis ­
t ance betwee n the respec tive seat and the
steering whee l or instrument panel. The i n­
formation registered is sent cont inuo usly to
the electron ic contro l unit to regulate de­
ployment of the front Advanced A irbags .
- The
PASSENGER AIR BAG OFF light comes
on and stays on in the center o f the instr u­
ment panel¢
page 153, fig. 148 and tells
you whe n the front Advanced Airbag on the
passe nger side has been tu rned off.
- A sensor below the safety belt latch for the
front seat passenger to measure t he tension
on the safety belt. The tension o n the safety
be lt and the weight regis tered by the
weigh t-sensi ng ma t he lp the control uni t
"de cide" whe ther the front airbag fo r the
front passenge r seat should be turned off or
not ~
page 144, Child restraints on the
front seat -some important things to
know.
- A sensor in t he safety be lt latch fo r the d riv­
er and for the front seat passenger that
senses w hethe r th at safety belt is latched or
not and transmits this information to the
electronic control unit.
•
•

150 Airbag sys te m
_& WARNING
Damage to the front passenger seat can
prevent the front airbag from working
properly.
- Improper repair or disassembly of the
front passenger and driver seat wi ll pre­
vent the Advanced A irbag System from
functioning properly.
- Repairs to the front passenger seat must
be performed by q ualified and properly
trained workshop personnel.
- Never remove the front passenger or
dr iver seat from the veh icle.
- Never remove the upholstery from the
front passenger seat.
- Never disassemble or remove parts from
the seat or disconnect wires from it.
- Never carry sharp objects in your pockets
or place them on the seat . If the weight­
sensing mat in the passenger seat is
punctured it cannot work properly.
- Never carry things on your lap or carry
objects on the passenger seat. Such
items can increase the weight registered
by the weight-se nsing mat and send the
wrong info rmation to the airbag control
unit.
- Never store items under the front pas­ senger seat. Parts of the Advanced Ai r­
bag System under the passenge r seat
c ou ld be damaged, prevent ing them and
the a irbag sys tem from working proper ­
ly .
- N ever place sea t covers or replacement
upholstery that have not been specifical­
ly approved by A udi on the fron t seats.
- Seat covers can preven t th e Advanced
Airbag System from recognizing child re ­
st raints or occupants on the front pas­
senger seat and prevent the side airbag
in the seat backrest from deploy ing prop­
er ly.
- Never use cushions, pillows, blankets or
similar items on the front passenger seat. The add itiona l padd ing will prevent
the weight-sensing mat in the seat from
accu rately reg iste ring the c hild restra int
-
or person on the seat and prevent the
Advanced Airbag System from function­
ing p roperly.
- If you must use a child restraint on the
front passenger seat and the child re­
straint manufacturer's instructions re­
qu ire the use of a towel, foam cushion or
something e lse to prope rly pos ition the
child restraint, make certain t hat the
PASSENGER AIR BAG OFF lig ht comes
on and stays on whenever the ch ild re­
straint is installed on the front passen ­
ge r seat .
- If the PASSENGER AIR BAG OFF light
does not come on and stay on, immedi ­
ately insta ll child restraint in a rear seat­
ing position and have the ai rbag system
inspected by your Audi dea ler.
How the Advanced Airbag System
components work together
T he front Advanced Airbag System and the
s ide a irbags supp lem ent the p rotection of­
fered by the front three-po int safety belts
with pre tensione rs and load lim iters and the
adjustable head res train ts to help redu ce the
risk of in jury in a wide ra nge of accident and
crash situations . Be s ure to read the impor­
tant information about safety and heed the
WARNINGS in th is chapter.
Deployment of the Adv a need Airbag System
and t he activation of the safety belt preten ­
s ioners depend on the deceleration measured
by the crash sensors and registered by the
electron ic co ntrol unit. The amount of infla­
t ion of t he front airbags can a lso be adapted
to the front seat pos ition, depending on the
distance between the respective front seat
and t he steer ing w heel or instrument panel as
regis tered by sensors in the seats. C rash se ­
verity depends on speed and dece leration as
well as the mass and st iffness of t he vehicle
or object involved in the crash .
On t he passenger side, rega rdless of sa fe ty
belt use, the airbag w ill be turned off if the
weight on the passenger seat is less than the ..,.

amount prog rammed in the e lec tronic control
u nit. The front airbag on the passe nger side
will also be turned off if one of the ch ild seats
that has been certified u nder Fede ral Motor
Vehicle Safety Standard 208 has been recog­ n ized o n the seat. The
PASS ENGER AIR BAG
OFF li gh t comes on and stays on to tell you
when the front Advanced A irbag on the pas­
se nger side has been tu rned off
Q page 144,
Child restraints on the front seat -some im­
portant things to know.
A WARNING
To reduce the risk of injury when an airbag
inf lates, a lways wear safety belts properly.
- If you are unrestrained, lean ing fo rward,
sitting sideways or out of position in any
way , yo ur risk of inj ury is much higher.
- You wi ll also receive serio us injuries and
cou ld even be killed if you are up against
the a irbag or too close to it when it in­
flates -even with an Advanced Airbag
Qpage 142.
More important things to know about
front airbags
F ig. 14 7 Inflated front a irbags
Safety belts are important to help keep front
seat occupants in the proper seated pos ition
so that airbags can unfo ld properly and pro­
v ide supplemental protection in a fronta l co l­
lision .
The front a irbags are designed to provide ad­
d itiona l protection for the chest and face of
the dr iver and the front seat passenger when :
- safety be lts are worn properly,
A irba g sy stem 151
- the seats have been positioned so that the
occ upant is properly seated as far as possi­
ble from the airbag,
- and the head restrai nts have been properly
adjusted .
Beca use ai rb ags infl ate i n t he bli nk o f an eye
wi th great fo rce, th ings you have on your lap
or have p laced on the seat co uld become dan­
gerous p ro jecti les, and be p ushed into you if
the a irbag inflates.
When an airbag deploys, fine dust is re leased .
T his is norma l and is not ca used by a fi re in
the ve hicle . This dust is made up mostly of a
powder used to lubricate the airbags as they
deploy. It could irr itate skin.
It is important to remember that wh ile the
s u pplementa l airbag system is designed to re­
duce the like lihood of serious injur ies , other
injuries, for example swelling, bru is ing and
minor abrasions, can also happen when air­
bags i nflate . A irbags do not protect the arms
or the lower parts of the body. Front a irbags
suppleme nt the th ree-point safety be lts only
i n some fronta l colli sions in which the vehicle
deceler ation is high e nough to deploy the air­
bags .
Front airbags will not deploy :
-if the ignition is sw itched off when a c rash
o ccur s,
- in side co llisions,
- in rear-end coll is ions,
- in rollovers,
- when the crash deceleration measu red by
the airbag system is less than the minimum
threshold needed for a irbag deployment as
reg istered by the electro nic contro l unit .
The front passenger airbag also will not
deploy:
-when the front passenger seat is not occu­
pied,
- when the weight on the front passenger seat as sensed by the Advanced Airbag Sys­
tem ind icates that the front a irbag on the
passenger side has to be turned off by the
II>

152 Airbag sys te m
electronic contro l uni t (the PAS SENGER AIR
BAG OFF
light comes on and stays on) .
A WARNING
Sitting in the wrong position can increase
the risk of serious injury in crashes.
- To reduce the risk of injury when the air­
bags inflate, the driver and passengers
must always sit in an upright position,
must not lean against or place any part
of the ir body too close to the area where
the a irbags are located .
- Occupants who are unbelted, out of posi ­
t ion or too close to the airbag can be se­
riously injured by an airbag as it unfolds
with great force in the blink of an eye
<=?page 144.
A WARNING
-
A child in a rearward -facing child sea t in­
stalled on the front passenger seat will be
seriously injured and can be killed if the
front airbag inflates -even with an Ad­
vanced Airbag System.
-The inflating ai rbag will hit the child seat
or infant carrier with great force and will
smash the ch ild seat and child against
the backrest , center armrest, door or
roof .
- Always install rear-facing child seats on
the rear seat.
- If you must install a rearward facing child seat on the front passenger seat
because of except iona l circumstances
and the
PASSENGER AIR BAG OFF light
does not come on and stay on, immedi­
ately i nstall the rea r-facing chi ld seat in a
rear seating position and have the ai rbag
system inspected by your Au di dealer.
A WARNING
Objects be tween you and the a irbag will
increase the risk of in jury in a c rash by in ­
terfering with the way the airbag unfolds
or by being pushed into yo u as the a irbag
inf lates. -
Never hold things in you r hands o r on
your lap when the veh icle is in use.
- Never transpo rt items on or in t he a rea
of the front passenger seat. Objects
could move into the area of the front air­
bags during braking or other sudden ma­
neuvers and become dangero us projec ­
tiles that can cause ser ious personal in­
jury if the a irbags inf late .
- Never p lace or attach accesso ries o r oth ­
er objects (such as cup hold ers, te le­
phone b ra ck ets, large, heavy or bulky ob­
jects) on the doors, ove r o r ne ar the are a
marked "AIRBAG" on the s teer ing whee l,
instr ument panel, sea t bac krests o r be ­
tween those areas and yourself. These
objects could ca use in jury in a crash, es­
pecially when the airbags inflate.
- Never recline the front passenger 's seat
to transport objects. Items can a lso
move into the area of the s ide airbag or
the front a irbag during braki ng or in a
sudden maneuve r. Objects near the air­
bags can become projectiles and cause
in jur y, partic ularly when the seat is re­
clined.
A WARNING
The fine dus t create d when air bags deploy
c a n cause breathing p rob lems fo r people
wi th a history of as thma or other breath ­
i ng cond itions.
- T o reduce the risk of breath ing pro blems,
those with asthma or other respiratory
conditions s hou ld get fresh air right
away by getting o ut o f the veh icle or
open ing windows or doors .
- If you are in a collision in which airbags
deploy, 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 c uts or scratches.
- If the res id ue should get into your eyes,
f lush them w ith water.

154 Airbag sys te m
restrained in one of the rear -facing or for­
ward-facing infant restraints listed in Feder­
al 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
PAS ­
SENGER AIR BA G OFF
light will stay on. Nev­
er install a rearward-fac ing ch ild restra int on
the front passenger seat, the safest place for
a child in any kind of child restraint is at o ne
of the seat ing pos itions on the rear seat
~ page 144, Child restraints on the front seat
- some important things to know
and
~ page 166, Child Safety .
If the PASSENGER AIR BAG OFF light come s
on
when one of the conditions listed above is
met, be sure to check the light regularly to
make certain that the
PA SSENGER AIR BA G
OFF
light stays on continuo usly whenever the
ignition is on. If the
PA SSENGER AIR BAG
OF F
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 switching the igni­
t ion off and then switching it on again;
- remove and reinsta ll the chi ld restraint.
Make sure that the child restraint is properly
insta lled and that the safety be lt for the
front passenger seat has been correct ly
routed throug h the child restraint as descri­
bed in the child restraint manufacturer's in ­
structions;
- make sure that the convert ible locking fea­
tu re on the safety belt for the front passen­
ger seat has been activated and that the
safety belt has been pulled t ight. The belt
mus t not be loose or have loops of slack so
that the sensor below the safety be lt latch
on the seat can do its job
~ page 175 .
-make su re that th ings that may increase the
weight of the chi ld and child seat are not be­
ing transported on the front passenger seat;
- make sure that the safety belt tension sen ­
sor is not b locked. Shake the safety be lt
l atch on the front passenge r seatback and
forth; -
If a strap or tether is be ing used to tie the
child seat to the front passenger seat, make
sure that it is not so t ight that it causes the
weight-sensing mat to measure more
weight than is actually on the seat.
If the PASSENGER AIR BAG OFF light still
does not come on
and does not stay on con­
t in uous ly (when the ignition is switched on),
- take the child restraint off the front passen -
ger seat and install it proper ly at one of the
rear seat positions. Have the airbag system inspected by your Audi dealer immed iate ly.
- move the child to a rear seat position and
make sure that the child is properly restra in­
ed in a ch ild restra int that is appropriate for
its size and age.
The
PASSENGER AIR BAG O FF light should
NO T come on when the ignit ion is on and an
adult is s itting in a proper seating position on
the front passenger seat. If the
PASSENGER
AIR BAG OFF
light comes on and stays on or
flashes fo r about 5 seconds w hile driving, un­
der these cir cumstances, make sure that;
-the adult on the front passenger seat is
properly seated on the center of the seat
cushion with his or her back up aga inst the
backrest and the backrest is not recl ined
~ page 12 5, Proper oc cupant seating posi­
tions,
- the adult is not tak ing we ight off the seat by
holding on to the passenger assist handle
above the front passenger door or s upport ­
ing their weight on the armrest ,
- the safe ty belt is be ing properly wo rn and
t ha t the re is not a lot o f slack in the safety
be lt webbing ,
- accesso ry sea t covers or cushions o r other
t hings that may cause an incorrec t reading
or impression on the weight -sensing mat
under the upho lstery of the seat have been
removed from the front passenger seat,
- a safety belt extender has not bee n left in
the sa fety belt latch for the front passenger
seat .
In addition to the
PASSENGER AIR BAG OFF
li ght in the center of the instrument panel, .,..

156 Airbag system
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 dis­
carded components do not cause injury or pol­
lute the environment.
.&_ WARNING
Improper care, servicing and repair proce­
dures can increase the risk of personal in­
jury 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 cleaning the horn pad or instrument
panel, use only a soft, dry cloth or one
moi5tened with plain water. Solvent5 or
cleaners could damage the airbag cover
or change the stiffness or strength of the
material so that the airbag cannot de­
ploy and protect properly.
- Never repair, adjust, or change any parts
of the airbag system.
- All work on the steering wheel, instru­
ment panel, front seats or electrical sys­
tem (including 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 authorized Audi dealer or qualified work­
shop.
- 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 replace­
ment upholstery over the front seat- backs that have not been specifically
approved by Audi.
- Never use additional 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 air­
bag module must always be repaired
immediately 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 system can be deployed only
once. After an airbag has been deployed,
it must be replaced with new replace­
ment parts designed and approved espe­
cially for your Audi model version. Re­
placement of complete airbag systems
or airbag components must be per­
formed by qualified workshops only. Make sure that any airbag service action
is entered in your Audi Warranty
& Main­
tenance booklet under
AIRBAG REPLACE­
MENT RECORD.
- For safety reasons in severe accidents,
the alternator and starter are separated
from the vehicle battery with a pyrotech­
nic circuit interrupter.
- Work on the pyrotechnic circuit inter­ rupter must only be performed by a
qualified dealer - risk of an accident!
- If the vehicle or the circuit interrupter
is scrapped, all applicable safety pre­
cautions must be followed.
® For the sake of the environment
Undeployed airbag modules and preten­
sioners might be classified as Perchlorate Material - special handling may apply, see
www .dtsc .ca.gov/hazardouswaste/per-
ch lo rate. When the vehicle or parts of the
restraint system including airbag modules
and safety belts with pretensioners are
scrapped, all applicable laws and .,.

regulations must be observed. Your au­
thorized Audi dealer is familiar with these requirements and we recommend that you
have your dealer perform this service for
you.
Other things that can affect Advanced
Airbag performance
Changing the vehicle's suspension system can
change the way that the Advanced Airbag Sys­
tem performs in a crash. For example, using
tire-rim combinations not approved by Audi, lower ing the vehicle, changing the stiffness of
the suspension, including the springs, suspen­ sion struts, shock absorbers etc. can change
the forces that are measured by the airbag
sensors and sent to the electronic control
un it . Some suspension changes can, for exam­
ple, increase the force levels measured by the
sensors and make the airbag system deploy in
crashes in which it would not dep loy if the
changes had not been made. Other kinds of
changes may reduce the force Levels meas­
ured 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 tell the elec­
tronic control module if the safety belt is
latched or not. If the safety belt is being used,
the front airbag will deploy at a slightly high­
er rate of vehicle deceleration than if the safe­
ty belt is not being used. Therefore, in a par­
ticular collision, it is poss ible that an airbag
will not deploy at a seating position where the
safety belt is being used but will inflate at the
position where the safety belt is not being
used. It is important that nothing interfere
with the safety belt buckles so that the sen­
sors can send the correct information about
safety belt use to the electronic control unit.
A WARNING
Changing the vehicle's suspension includ­
ing use of unapproved tire-rim combina­
tions can change Advanced Airbag per­
formance and increase the risk of serious personal injury in a crash.
Airbag system 157
-Never install suspension components
that do not have the same performance
characteristics as the components origi­
nally installed on your vehicle .
- Never use tire-rim combinations that
have not been approved by Audi.
A WARNING
-
Items stored between the safety belt
buckle and the center console can cause
the sensors in the buckle to send the
wrong information to the electronic con­
trol module and prevent the Advanced Air­
bag System from working properly.
- Always make sure that nothing can inter­
fere with the safety belt buckles and that they are not obstructed.
Knee airbags
Description of knee airbags
The knee airbag system con provide supple­
mental protection to properly restrained
front seat occupants.
Fig. 149 Driver 's airbag
The driver knee airbag is in the instrument
panel underneath the steering wheel
¢ fig . 149, the airbag for the passenger is at
about the same height in the instrument pan­
el underneath the glove compartment.
The knee airbag offers additional protection
to the driver's and passenger's knees and up ­
per and Lower thigh areas and supplements
the protection provided by the safety belts.
If the front airbags deploy, the knee airbags
also deploy in frontal col lisions when the de­
ployment threshold stored in the control unit .,,.

158 Airbag system
is met ¢ page 151, More important things to
know about front airbags.
I n addition to their normal safety function,
safety belts he lp keep t he driver or front pas­
senger in position in a frontal coll is ion so that
the airbags can provide supplemental protec­
tion.
The airbag system is not a s ubst itute for yo ur
safety be lt . Rathe r, it is part of the overall oc ­
cupant restraint system in your vehicle. Al­
ways remember that the airbag system can
only help to protect you if you are wearing
your safety belt and wear ing it properly. This
is why you shou ld always wear your safety
belt, not just because the law requires you to
do so
¢page 134, General notes .
The safety belt buck le for the driver and front
seat passenge r have switches that tell the air­
bag control module if the safety belt is being
used or not . If the safety belt is being used,
the knee airbag will deploy at a sligh tly higher
rate of decelera tion than if the belt is not be­
ing used . Therefore, in a par tic ul ar collision, it
is possible that an airbag will not deploy at a
seating position where the safety belt is being
used but will inflate at the pos ition where the
safety belt is not be ing used.
Remember too, airbags will deploy only once
and on ly in certain kinds of accidents -your
safety be lts are a lways there to offer protec­
tion in those accidents in which airbags are
not supposed to deploy or when they have al­
ready deployed, fo r example whe n your veh i­
cle strikes or is struck by another after the
fi rst coll is ion.
This is just one of the reasons why an a irbag is
not a substitute for the safety belt . The airbag
system works most effective ly when used with
the safety belts. Therefore, always wea r your
safe ty be lts correctly.
It is importan t to remember that while the
supplemental knee a irbag system is designed
to reduce the like lihood of serious injur ies,
o ther inj uries, fo r example, swel ling, bruising,
minor abr asions and fri ction burn s ca n also
occ ur when an a irbag inflates.
The knee airbag system basic ally consists
of:
- The e lectronic control module
- Two inflatable ai rbags (a irbag a nd gas gen -
erator), one for the driver and one for the
front passenger
- The a irbag indicator light in the instr ument
panel
The knee airbag system w ill not deploy:
- when the ig nit ion is switched off
- in frontal collisions when the deceleration
meas ured by the control unit is too low
- in side collisions
- in rear-end collisions
- in rollovers
- in the event of a system malfunction (warn-
ing/ind icator light is on)
¢ page 18.
A WARNING
--
-Safety belts and the airbag system can
only provide protection w hen occupants
are in the proper seating position
¢page 151.
-If the airbag ind icator light comes when
the vehicle is be ing used , have the sys­
tem inspected immediate ly by you r au­
thori zed A udi dealer. The airbag may not
w ork p roperly when the vehicle accele ra­
tion in a side collision is high enough to
de ploy the airbag . See also¢
page 18 .
How knee airbags work
The risk of injury to the leg area can be re ­
duced by fully inflated knee airbags.
Fi g. 1 50 In flated airbags protect ing in a frontal colli­
s io n
...