2009 AUDI S8 ignition

Airbag system -----------------=--=--------
as defined in the electronic control unit~ page 232 , "PASSENGER
AIR BAG OFF l igh t" .
A lways remember, a ch ild seat or infant carrier installed on the front
seat may be st ruck and knocked out of position by the rap idly
i n fl ating pass enger 's airbag in a fro nta l co llision . Th e airb ag co uld
g reatly reduce the effectiveness of the chi ld restraint and even seri ­
ousl y injure t he c hild duri ng i nflati on .
F or this reason, and because the bac k seat is the safest place for
ch ildr en -w he n prop erly res trained acc ording t o th eir age an d size
- we stro ngly recomm end that c hild ren a lwa ys sit in th e back seat
~ page 24 5, "C hil d Safe ty" .
& WARNING
A child in a rearward -facing child seat installed on the front
passenger seat will be seriously injured and can be killed if the
front airbag inflates -even with an Advanced Airbag System.
• The inflating airbag will hit the child seat or infant carrier with
great force and will smash the child seat and child against the
backrest , center arm rest, 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 exceptional circumstances and the
PASSENGER AIR BAG OFF light does not come on and stay on,
immediately install the rear -facing child seat in a rear seating posi­
tion and have the airbag system inspected by your Audi dealer.
• Forward -facing child seats installed on the front passenger's
seat may interfere with the deployment of the airbag and cause
serious personal injury to the child .
& WARNING
If, in exceptional circumstances, you must install a forward-facing
child restraint on the front passenger's seat:
Controls and equip­ ment Safety first
Vehicle operation
& WARNING (continued)
• Always make sure the forward-facing seat has been designed
and certified by its manufacturer for use on a front seat with a
passenger front and side airbag .
• Never put the forward-facing child restraint up against or very
near the instrument panel .
• Always move the passenger seat into its rearmost position in
the seat's fore and aft adjustment range, as far away from the
airbag as possible before installing the forward-facing child
restraint. 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.
& WARNING
To reduce the risk of serious injury , make sure that the PASSENGER
AIR BAG OFF 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 described
~ page 231 , "Monitoring the Advanced
Airbag System" .
• Take the child restraint off the front passenger seat and install
it properly at one of the rear seat positions if the PASSENGER AIR
BAG OFF light does not stay on .
• Have the airbag system inspected by your Audi dealer immedi ­
ately .
• Always carefully follow instructions from child restraint manu ­
facturers when installing child restraints .
& WARNING
If, in exceptional circumstances, you must install a forward or
rearward-facing child restraint on the front passenger's seat :
Vehicle care Do-it-yourself service Technical data

__________________________________________________ A_ i_ r _b _a...; g::- s_ y=--- s_t _e _m __ lll
& W ARNING (continued )
• If you must in stall a rearward facing child seat on the front
passenger seat because of exceptional circumstances and the
PASSENGER AIR BAG OFF light does not come on and stay on,
immediately install the rear -facing child seat in a rear seating posi ­
tion and have the airbag system inspected by your Audi deale r.
& WARNING
If, in exceptional circumstances , you must install 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 manufacturer for use on a front seat with a
passenger front and side airbag .
• Never put the forward -facing child restraint up against or very
near the instrument panel.
• Always move the passenger seat into its rearmost position in
the seat's fore and aft adjustment range , as far away from the
airbag as possible , before installing the forward -facing child
restraint. 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 . •
Advanced Airbag System components
T he front passenger seat in your vehicle has a lot of very i mporta nt
parts of the Advanced A irbag System in it . T hese parts inc lude the
we ig ht -sens ing mat, se nso rs, w iring, bra cke ts, and more . The func ­
tion of the system in the front passenger seat is checked by the e lec­
tr onic con trol uni t w hen the ig nit io n i s on. T he co ntro l u nit mo nitors
the Advanced Airbag System and turns the a irbag indicator li ght on
w he n a mal fu ncti on in th e sy ste m com ponen ts is de tec ted . Th e
function of the airba g indicator lig ht is desc ribed in greater detail
below . Because the front passenge r seat contains important parts
Controls and equip­ ment Safety first Vehicle operation of the Advanced Airbag System, you must
take care to prevent it
fro m being damaged. Damage to the sea t may prevent t he
Advanced Airbag for the front passenger seat from doing its job in
a cra sh.
The front Advanced Airbag System consists of the
following: • C rash sensors in the front of the vehicle that measure vehic le
acce lera tion/dece lera tio n to p rovide i nfo rm ati on to the A dva nce d
Airbag System about the severity of the crash .
• An ele ctro nic c ontrol unit , with integ ra te d crash se nsors f or front
and side impacts. The control unit "decides" whether to fire the
fr ont airbags based on the info rmati on receive d from the cras h
sensors. The control unit also "decides" whethe r th e safety belt
p retens ione rs sh ould be activated .
• An Advanced Airbag with gas generator for the driv er inside th e
stee ring w hee l hub .
• A n Advanced Airbag with gas gene rator inside the instrument
p a nel for the fr ont pa ssen ger.
• A weight -sens ing mat under the upholstery padding of the front
pa ssenge r sea t cush io n th a t m eas ures the tot al w eig ht on the se at .
T he info rmation registered is sent continuously to the e lect ron ic
c on tro l unit t o reg ulate de plo ym en t of th e fr ont A dva nce d Ai rbag on
th e passenger sid e.
• An airbag monito rin g syst em and indicator lig ht in the instru­
ment cluster => page
231 .
• The PASSENGER AIR BAG OFF lig ht co mes o n an d stays on in th e
center of the instrument panel=> page
232 , fig. 235 and tells you
w hen th e front A dv anced Air b ag o n the p asseng er s ide h as been
turned off .
• A se nso r be low t he safety belt l atc h for the fro nt sea t pass enger
to measure the tension on the safety be lt . T he tension on the safety
belt and the w eigh t re giste red by the wei ght-s en sing mat h elp t he
control unit "decide" whether the front airbag for the front
p asse nge r seat shou ld be t urned off or not => pag e
222, "Child
restraints on the front seat -some important things to know". _,.
Vehicle care Do-it-yourself service Technical data

-L~A:::..:,: ir:....: b:!..::: a~g L.:: s:1y :...:s::..: t~ e:.: m:...:...:.. ________________________________________________ _
or the lower parts of the body. Front airbags supp leme nt th e thr ee­
poi nt s afet y be lts only in so me front al colli sion s in which th e vehi cle
dece lerat ion is hi gh enou gh to d ep loy the a irba gs.
Front airbags will not deploy:
• if the ignition is switched off when a crash occurs,
• i n sid e collis io ns,
• i n rea r- e nd collisi ons ,
• in ro llovers,
• when th e c ras h de celerat io n measur ed by the a irba g system is
less than the minimum threshold needed for a irbag deployment as
r egi stere d by th e ele ctro nic con trol uni t.
The front passenger airbag also will not deploy :
• when th e fr ont pass enger seat is no t occupi ed,
• when the weight on the front passenger seat a s sensed by the
A dvanced A irbag Syste m indicates tha t the fr ont air bag o n the
passenger side has to be turned off by the e lectronic cont rol unit
(t he PASSENGER AIR BAG OFF li gh t comes o n and s tays o nl.
& WARNING
Sitting in the wrong position can increase the risk of serious injury
in crashes .
• To reduce the risk of injury when the airbags inflate , the driver
and passengers must always sit in an upright position , must not
lean against or place any part of their body too close to the area
where the airbags are located.
• Occupants who are unbelted , out of position or too close to the
airbag can be seriously injured by an airbag as it unfolds with
great force in the blink of an eye
=> page 222.
& WARNING
A child in a rearward -facing child seat installed on the front
passenger seat will be seriously injured and can be killed if the
front airbag inflates - even with an Advanced Airbag System .
• The inflating airbag will hit the child seat or infant carrier with
great force and will smash the child seat and child against the
backrest , center arm rest , 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 exceptional c ircumstances and the
PASSENGER AIR BAG OFF light does not come on and stay on,
i mmed iately install the rear-facing child seat in a rear seating posi­
tion and have the airbag system inspected by your Audi dealer.
& WARNING
Objects between you and the a irbag will increase the risk of injury
in a crash by interfering with the way the airbag unfolds or by
be ing pushed into you as the airbag inflates.
• Never hold things in your hands or on your lap when the vehicle
is in use.
• Never transport items on or in the area of the front passenger
seat. Objects could move into the area of the front airbags during
braking or other sudden maneuvers and become dangerous
projectiles that can cause serious personal injury if the airbags
inflate .
• Never place or attach accessories or other objects (such as cup
holders , telephone brackets , large, heavy or bulky objects) on the
doors , over or near the area marked "AIRBAG " on the steering
wheel , instrument panel , seat backrests or between those areas
and yourself . These objects could cause injury in a crash , espe­
cially when the airbags inflate .
• Never recline the front passenger's seat to transport object s.
Items can also move into the area of the side airbag or the front ..,

Airbag system -----------------=~-
& WARNING (continued )
airbag dur ing braking or in a sudden maneuver . Objects ne ar the
airbags can become proje ctile s and cau se injury , particularly when
the seat is reclined .
& WARNING
The fine dust created when airbags deploy can cause breathing
p roblems for people with a history of asthma or other breathing
c onditions .
• To reduce the risk of breathing problems , those with asthma or
other respir atory cond itions should get fresh air right away by
getting out of the vehicle or opening 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 cuts or
scratches.
• If the residue should get into your eyes , flush them with
water .•
Monitoring the Advanced Airbag
System
Airbag monitoring indicator light t~
Tw o separate indicators monitor th e funct ion of the
Adva nced A irbag Syst em : the a ir b ag mon itor in g i ndicator
l ig ht an d the
PASSENGER AIR BAG OFF light.
The Advanced Airbag System (including the electronic control unit,
s en sor cir cu its a nd sys tem wiring) is mon itored co ntinuous ly to
make sure that it is functioning properly whenever the ignition is on.
E ac h tim e you turn on th e ig niti on, the ai rbag monito ring ind icator
light
t~ w ill come on for a few seconds (se lf diagnostics) .
Controls and equip­ ment Safety first Vehicle operation
The system must be inspected wh
en the indicator
light ~:
• does not come on when the ignition is switched on,
• does not go ou t a few sec ond s a fter you have swi tc hed on the
ignition, or
• comes on while d riv in g.
I f an airbag system malfunction is detected, the indicator light will
fi rst sta rt fla sh ing to catch the d rive r's atten tion an d t hen stay on
cont inuously to serve as a constant reminder to have the syst em
inspected i mmedia tely.
If a mal funct ion occurs that tu rns the fro nt a irbag o n th e passe nger
side off, the PASSENGER AIR BAG OFF light will come on and stay on
whe neve r the ig nit ion is on.
& WARNING
An airbag system that is not functioning properly cannot provide
supplemental protection in a frontal crash .
• If the airbag indicator light comes on , it means that there may
be something wrong with the Advanced Airbag System. It is
possible that the airbag will inflate when it is not supposed to , or
will not inflate when it should .
• Have the airbag system inspected immediately by your Audi
dealer .•
Vehicle care Do-it-yourself service Technical data

-Airbag system PW,._____ -=--=-----------------
PASSENGER AIR BAG OFF light
1~ J,
i
( ~ I :."!l.t.~ A I ~ )
Fig. 235 Sectio n fr om
th e i nstrument panel:
PAS SENGER AIR BAG
OFF light
The PASSENGER AIR BAG OFF light is located in the center of the
instrument pane l => fig.
235 .
The PASSENGER AIR BAG OFF light 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 contro l unit . Each time you turn on
the ignition, the
PAS SENGER AIR BAG OFF light wi ll flash for a few
seconds and :
• will stay on if the front passenger seat is not occupied,
• will stay on if there is a small chi ld or chi ld restraint on the front
passenger seat ,
• will go out if the front passenger seat is occupied by an adult as
registered by the weight -sensing mat .
The
PASSENGER AIR BAG OFF light must come on and stay on if the
ignition is on and
• a car bed has been installed on the front seat, or
• a rearward-facing child restraint has been installed on the front
passenger seat, 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
Federa l Motor Vehicle Safety Standard 208 with which the Advanced
Airbag System in your vehicle was certified .
I f the front passenger seat is not occupied, the front airbag wil l not
deploy, and the
PASSENGER AIR BAG OFF li ght wi ll stay on. Never
install a rearward -facing child restraint on the front passenger seat,
the safest place for a child in any kind of child restraint is at one o f
the seating posi tions on the rear seat=>
page 222, "Child restraints
o n the front seat -some important things to know" and=>
page 245,
"Chi ld Safety".
If the PASSENGER AIR BAG OFF 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 and then turning
it on again;
• remove and reinstal l the child restraint. Make sure that the child
restraint is properly insta lled 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 feature on the safety belt
for the front passenger seat has been activated and that the safety
belt has been pulled tight . The belt 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 255.
• make sure that things that may increase the weight of the child
and child seat are not being transported on the front passenger
seat;
• make sure that the safety belt tension sensor is not 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 child seat to the front
passenger seat, make sure that it is not so tight that it causes the .,_

Airbag syst em -----------------=~-
weight -sensing mat to measure more weight than is actually on the
seat .
If th e PA SSENGER AIR BAG OFF light still d oes not come on and does
not stay on continuously (when the ignition is switched on),
• t ake the child r estraint off the front passenger seat and install it
properly 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 proper ly restrained in a child restraint that is appropria te for
its size and age .
The
PA SSENGER AIR BAG OFF light shou ld NOT come on when the
ignition is on and an adult is sitting in a proper seating posi tion on
the front passenger seat . If the
PASSENGER AIR BAG OFF light
comes on and stays on or flashes for about 5 seconds whi le driving,
under these circumstances, make sure that :
• the adu lt on the front passenger sea t is properly seated on the
center of the seat cushion w ith his or her back up against the back­
res t and the backrest is not reclined => page 202, "Proper occupant
sea ting positions" ,
• the adult is not taking weight of f the sea t by holding on to the
passenger assist handle above the front passenger door or
supporting their we ight 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 impression on the weight -sensing mat
under the upho lstery of the seat have been removed from the front
passenger sea t,
• a safety belt extender has not been left in the safety be lt latch for
t he front passenger seat .
In addition to the
PASSENGER AIR BAG OFF light in the center of the
instrument pane l, the message
PASSENGER AIR BAG O FF o r
PAS SEN GER AIR BA G ON will briefly appear in the instrument c luster
Controls and equip­
ment Safety first Vehicle operation
display. This is to inform the driver of the current front passenger
a
irbag status .•
Important safety instructions on monitoring
the Advanced Airbag System
& WARNING
An airbag sy stem that is not functioning properly cannot provide
supplemental protection in a front al cra sh .
• If the airbag ind icator li ght come s on , it means that there may
be something wrong with the Advanced Airbag S ystem . It is
po ssible that the airbag will inflate when it is not suppo sed to , or
w ill not infl ate when it should .
• Have the airb ag system inspe cted immediatel y by you r Audi
dealer.
& WARNING
If the front airba g inflates , a child with out a child re straint , or in a
re arw ard -fa cing chi ld safety seat , or
in a forward-fa cing child
r e str aint that has not been properly installed will be seriously
inj ured and can be killed .
• Even though your vehicle i s equipped with an Adv anced Airbag
Sy stem , m ake cert ain that all children , e speci ally 12 year s and
younger , always ride on the bac k seat prope rly re strain ed for their
a ge and siz e .
• Alway s install forw ard or rear -facing child seat s on the rear
se at - ev en with an Ad vanced Airbag Sy stem .
• If you mu st install a rearward -fa cing child se at o n th e front
p ass enger sea t be cau se of e xceptional circumstan ce s and the
PASSENGER AIR BAG OFF light doe s not appear and stay on , imme ­
diately in stall the rear -fac ing child seat in a r ear sea ting pos itio n
and have the airbag system inspect ed b y your Audi dealer . .,,
Vehicle care Do-it-yourself service Technical data

llffll,___A_ ir_ b_ a.::g <-- s-- & WARN ING (continued )
• A tight tether or other strap on a rearward-facing child restraint
attached to the front passenger seat c an put too much p res su re
on the weight-sensing mat in the seat and reg ister more weight
than is actually on the seat . The heavier weight registered can
make the system work as though an adult were on the seat and
deploy the Advanced Airbag when it mu st be suppre ssed causing
serious or even fatal injury to the child .
• If, in exceptional circumstances , you must install a forward ­
f ac ing child restraint on the front passenger seat , always move the
seat into its rearmost position in the seat's fore and aft adjust ­
ment range , as far away from the airbag as possible . The ba ckrest
must be adju sted 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 .
& WARNING
• If the PASSENGER AIR BAG OFF light does not go out when an
adult is sitting on the front passenger seat after tak ing the steps
described above, make sure the adult i s properly seated and
restrained at one of the rear seat ing positions .
• Have the airbag system inspected by your Audi dealer before
transporting anyone on the front passenger seat .
[ i ] Tips
If the we ight -sens ing mat in the front passenger seat detects an
e m pty s eat, th e front airbag on the passenge r side wil l be tur ned
off , and the PASSENGER AIR BAG OFF li ght wil l stay on .•
Repair, care and disposal of the airbags
Parts of the airbag system are insta lled at many different places on
yo ur Audi. Ins tal li n g, r em oving, s ervicing o r rep airi ng a part in an area of the vehicle can damage a part of an airbag system and
p revent that sys tem from wo rking pr operly in a c ollisi on.
Th ere are some important th ings you have to know to ma ke sure
that the effectiveness of the system will not be impai red and that
discarded co mponents do no t cause i njury or po llute the enviro n­
ment.
& WARNING
Improper care , servicing and repair procedures can increase the
risk 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 atta ch any objects su ch 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 moistened 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 .I must be performed by a
qualified technician who has the train ing and special equipment
necessary .
• For any work on the airbag system, we strongly recommend
that you see your author ized 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 inter-
ference :
~

___ A_ ir_b _a_ g;:::;_ s--=- y_s _t _e _m _________________________________________________ _
& WARNING (c ont in ued)
- Alwa ys ha ve work on th e doo rs done by an auth ori ze d Aud i
d ea le r or q ualified works hop . •
Side curtain airbags
Description of side curtain airbags
The side curtain airbag system can provide supplemental
protection to pr operly restrained occupants .
Fig. 240 Side cu rtai n
ai rb ags, drive r's side:
s ide c urt a in airb ag
l oca tion
The side curtain airbags are located on both sides of the interior
above the front and rear side windows~ fig. 240. They are identi ­
fied by the word "AIRBAG" on the windshield frame and the center
roof pillar.
The side curtain airbag system supplements the safety belts and can help to reduce the risk of injury for occupants' heads and upper
torso on the side of the vehicle that is struck in a side collision. The
side curtain airbag inflates only in side impacts and on ly when the
vehic le acceleration registered by the control unit is high enough . If
t his rate is below the re ference value programmed into the control
unit, the side airbags will not be triggered, even though the car may
be badly damaged as a result of the collision . It is not possib le to
define an airbag triggering range that will cover every possible angle of
impact, since the circumstances will vary considerably
be tween one collision and another. Important factors include, for
example, the nature (hard or soft) of the impacting object, the ang le
of impact, vehicle speed, etc.~
page 243, "How side curtain airbags
work" .
Aside from their normal safety function, safety belts work to help
keep the dr iver or front passenger in position in the event of a colli ­
sion so that the side curtain airbags can prov ide protection .
The airbag system is not a substitute for your safety belt. Rathe r, it
is part of the overall occupant restraint system in your vehicle .
A lways remember that the airbag system can on ly help to protect
you if you are wearing your safety belt and wearing it properly. This
is another reason why you should always wear your safety belts, not
just because the law requires you to do so~
page 211, "General
notes".
It is important to remember that while the side curtain airbag
system is designed to he lp reduce the like lihood of serious injuries,
other injuries, for example, swelling, bruising, and minor abrasions
can a lso be associated with these airbags upon deployment.
Remember too, these airbags wi ll dep loy only once and only in
certain kinds of accidents -your safety belts are always there to
offer protection.
Th e s ide cu rtai n air ba g sys te m b asi ca lly co nsis ts of:
• The electronic control modu le and external side impact sensors
• T he side curtain airbags above the front and rear side windows
• The airbag indicator light in the instrument panel
The airbag system is monitored electronically to make certain it is
funct ion ing proper ly at all times . Each time you turn on the ignition,
the airbag system indicator light will come on for a few seconds (self diagnostics).
The s ide c urtain a irbag is no t activa te d:
• if the ignition is tu rned off,