2008 AUDI S8 light

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 continuously (when the ign ition is switched on) ,
• t ake the chil d re stra int off th e front passeng er seat and i nstall it
proper ly at one of the rear seat pos it ions . Have the a irbag system
i nspec ted by y our Audi d ealer im mediately.
• move the child to a rear seat position and make sure that the
c h ild is pro perl y restrai ned i n a c hild rest ra in t t ha t is ap prop ria te fo r
its s ize and age .
T he
PASSENGER AIR BAG OFF light s hou ld NOT come on when the
ignition is on and an adult is sittin g in a proper seating position on
the fro nt passenger seat . If the
PASSENGER AIR BAG OFF light
co me s on a nd stays o n or flas hes fo r abou t 5 s econds whi le d rivin g,
under these ci rcumstances , ma ke su re that :
• th e adult on the front passeng er sea t is pro pe rly s eate d on the
cent er of the seat cushion with his or her back up again st th e back ­
res t and the bac kres t is no t recl ined => page 20 0, "Pr oper o ccupa nt
seating positions",
• the adult i s not ta king w eight off the se at b y ho ld in g on to the
passenger assist handle above the front passenger door or
su ppo rtin g th eir we ig ht on t he ar mrest,
• the safety belt is being p roper ly worn and that there is not a lot
o f slac k in th e safety bel t webb ing,
• accessory seat covers or c ushions or other things that may cause
an incorrect r ead ing o r impre ss io n on th e w eight-s en sin g m at
unde r the upho lste ry of the seat have been removed from the front
p ass enger sea t,
• a safety belt extender has not been left in t he safety be lt latc h for
the fr ont pass enge r se at.
I n addition to the
PASSENGER AIR BAG OFF light in the center of th e
in stru men t p ane l, the message
PASSENGER AIR BAG OFF o r
PASSENGER AIR BAG ON wi ll briefly appe ar in the instrum ent c luster
Controls and equip­
ment Safety first Vehicle operation
Airbag system
d
isplay . This is to inform the driver of the current front passenger
a irb ag stat us.•
Important safety instructions on monitoring
the Advanced Airbag System
& 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.
& WARNING
If the front airbag inflates , a child without a child restraint , in a
rearward-facing child seat or in a forward-facing child restraint
that has not been properly installed will be seriously injured and can be killed.
• Even though your vehicle is equipped with an Advanced Airbag
System , make certain that all children , especially 12 years and
younger, always ride on the back seat properly restrained for their
age and size .
• Always install forward or rear -facing child seats on the rear
seat -even with an Advanced Airbag System .
• 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 appear and stay on , imme ­
diately install the rear-facing child seat in a rear seating position
and have the airbag system inspected by your Audi dealer .
~
Vehicle care Do-it-yourself service Technical data

__ .....;.A..;.;.;. ir.;;b ;..; a;;;;. g=... s;;;.!. y.;;s ..;;t ..;;e ;.;.m.;..;... ________________________________________________ _
&, W ARNING (continued )
• A tight tether or other strap on a rearward-facing child restraint
attached to the front passenger seat can put too much pres sure
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 must be suppressed causing
serious or even fatal injury to the child .
• 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 adjust­
ment range , as far away from the a irbag 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 .
& 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 seating 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 mp ty s eat, th e front air bag o n the pass enge r sid e wil l be tur ned
off, and PASSENGER AIR BAG OFF will stay on.•
Repair, care and disposal of the airbags
Parts of the airbag system are insta lled at many different places o n
yo ur Au di. In stal li n g, r emo vin g, s ervic ing or rep airi ng a part i n an area of the vehicle can damage a part of an airbag system and
p re vent that sys tem from wor king pr operly in a c ollis ion.
Th ere are some important th ings you hav e to know to ma ke sure
that t he effectivenes s of the system will not be impai red and that
discar ded co mponents do not ca use injury o r po llut e 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 training and special equipment
necessary .
• 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 .
• Always make sure that the side airbag can inflate without inter-
ference :
~

is why you should always wear your saf ety belt, not just because the
l a w requires you to do
so => page 209, "Genera l notes" .
The safety belt buckle for the driver and front seat passenger have switches that tell the airbag control module if the safety belt is
being used or not. If the sa fety bel t is being used, the knee airbag
will deploy at a s lightly higher rate of deceleration than if the belt is
not be ing used . Therefore, in a par ticular collision, it is possib le that
an airbag will not deploy at a seating position where the safety belt
is be ing used but will inflate at the position where the safety belt is
not being used .
Remember too, airbags will deploy only once and only in ce rtain
kinds o f accidents -your safety be lts are always there to o ffer
protection in those accidents in wh ich airbags are not supposed to
deploy or when they have already deployed, for examp le when you r
vehic le strikes or is struc k by another after the first collision.
T his is just one of the reasons why an ai rbag is not a subs titute for
the safety be lt. The airbag system works most effectively when used
with the safety belts. Therefore, a lways wear your safety belts
correctly.
I t is important to remember that while the supplemental airbag
system is designed to reduce the like lihood o f ser ious injuries, other
injuries, for example, swelling, bruising, and minor abrasions can
a lso be associated with airbags.
The kn ee airbag system bas ically consists of:
• T he electro nic control module
• T wo inflatable airbags (ai rbag and gas generato r), one for the
driver and one for the front passenger
• T he airbag indicator light in the instrument panel
The kn ee airbag system will not deploy :
• whe n the ignit ion is turned off
• in front -end collisions when the deceleration measured by the
control uni t is too low
• in side collisions
Airb ag syst em
• in rear -end co llisions
• in ro llovers
• in the event of a system malfunction (warning/indicator light illu ­
minated)=> page 19 .
& WARNING
• Safety belts and the airbag sy stem ca n only provide protec tion
when oc cupants are in the proper seating po sition
=> page 227 .
• If the airbag indi cator light comes when the vehi cle is b eing
u sed , have the system in spected immediately by your authorized
Audi dealer . The airbag may not work properl y when the vehicle
acceleration in a side colli sion is high enough to deploy the a irbag.
See
also => page 19. •
How knee airbags work
The risk of injury to the leg are a is reduce d by fully
depl oye d knee air ba gs.
-
Fig . 235 I nfl ate d
airba gs prot ecting in a
frontal colli sio n
The knee airbag system has been designed so that the airbags for
t he drive r and front passenger a re deployed in certain but not all
frontal col lisions.
ill-
Vehicle care I I Technical data

Side airbags
Description of side airbags
The airbag system can provide supplemental protecti on
to properly restrained occupants.
Fi g. 23 6 Sid e a ir b ag
lo ca tio n in the d riv er' s
sea t
The side airbags are located in the sides of the front seat backrests
=> fig. 236 and the rear backrest facing the doors . They are identified
by the word "AIRBAG" .
The side airbag system b asic ally con sist s of :
• the electronic control module and external side impact sensors
• the two side airbags located in the sides of the front backrests
• two rear side airbags
• the a irbag warning light in the instrument cluster.
The airbag system is monitored electronically to make certain that it is functioning properly at all times. Each time you turn on the igni ­
tion, the airbag system indicator light wi ll come o n for a few
seconds (self diagnostics).
The side airbag system supplements the safety belts and can help to reduce the risk of injury to the driver's, front and rear passenger's
upper torso on the side of the vehicle that is struck in a side colli ­
s ion. The airbag deploys only in s ide impacts and on ly when the
vehicle acceleration registered by the control unit is high enough . If
Airb ag syst em
this rate is below the reference value programmed into the control
un it, the side airbags w ill not be triggered, even though the car may
be badly damaged as a result of the col lision. It is not possible to
define an airbag triggering range that wi ll cover every possible
ang le of impact, since the circumstances will vary considerably
between one collision and another. Important factors include, for
examp le, the nature (hard or soft) of the impacting object, the angle
of impact, vehic le speed, etc. =>
page 238, "Important safety instruc ­
tions on the side airbag system".
Aside from their norma l safety function, safety belts work to he lp
keep the driver or front passenger in position in the event of a side
collision so that the side airbags can provide protection .
The airbag system is
not a substitute for your safety belt . Rathe r, it
is part of the overa ll occupant restraint system in your vehicle.
Always remember that the side airbag system can only he lp to
pro tect you if you are wearing your safety belt and wear ing it prop­
erly. This is another reason why you should a lways wear your safety
b elts, n ot just because the law requires you to do so =>
page 209,
"General notes".
I t is important to remember tha t while the supplementa l side airbag
system is designed to reduce the likelihood of serious injuries, other
injuries, for example, swelling, bruising, and minor abrasions can
a lso be associated with deployed side airbags . Remember too, side
airbags will deploy only once and on ly in certain kinds of accidents
-your safety belts are always there to offer pro tec tion .
Vehicle damage, repair costs or even the lack of vehicle damage are not necessarily an indication of over -sensi tive or failed airbag acti ­
vation . In some collisions, both front and side airbags may inflate.
Remember too , that airbags will deploy on ly once and only in
certain kinds of collisions -your safety belts are always there to
offer protection in those acc idents in which airbags are not
supposed to deploy or when they have already dep loyed.
The sid e airbag system will not deploy :
• when the ignition is turned of f
Vehicle care I I Technical data

lllffl __ A_ ir_b _a_ g;::;_ s-=-- y_s _t _e _m _________________________________________________ _
• in side collisions when the acceleration 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, side curtain airbags
and side airbags may be triggered together.
& WARNING
• Safety belts and the airbag system will only provide protection
when occupants are in the proper seating position
~ page 238.
• If the airbag indicator light comes on when the vehicle is being
used , have the system inspected immediately by your authorized
Audi dealer . The airbag may not work properly when the vehicle
acceleration in a side collision is high enough to activate the
airbag .•
How supplemental side airbags work
Side airbags deploy instantly and can help reduce the risk
of upper torso injuries for occupants who are properly
restrained.
Fig . 237 Inflated side
airbags on left side of
vehicle, rear s ide
airbag
When the system is triggered, the airbag is fi lled with propellant gas
and breaks through a seam in the seat surface area marked
"AI RBAG ". I t expands between the side trim panel and the
passenger. In order to he lp provide this additional protection, the
side airbag must inflate within a fraction of a second at very high
speed and with great force . The supplemental side airbag could
injure you if your seating 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 243, "Ch ild Safety" .
Supplem ental side airbags inflate between the occupant and the
door panel on the side of the vehic le that is struck in certain side
collision~ fig. 237.
Although they are not a soft pi llow, they can "cushion" the impact
and in this way they can he lp 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. •
Important safety instructions on the side
airbag system
Airbags are only supplemental restraints. Always prop­
erly wear safety belts and ride in a proper seating posi­
tion .
There is a lot that you and your passengers must know and act
accordingly to help the safety belts and airbags do their job to
provide supplementa l protection.
& WARNING
An inflating side airbag can cause serious or fatal injury. Improp ­
erly wearing safety belts and improper seating positions increase
the risk of serious personal injury and death whenever a vehicle is
being used .
~

---------------------------------------------~A~ ir'..!b!: a:! g~ s~ yr_; s::!. t~ e~ m~ _lffllll
& WARNING (continued)
• In order to reduce the risk of injury when the supplemental side
airbag inflates:
-Always sit in an upright position and never lean against the
area where the supplemental side airbag is located.
- Never let a child or anyone else rest their head against the
side trim panel in the area where the supplemental side airbag
inflates.
- Always make sure that safety belts are worn correctly,
- Do not let anyone sitting in the front seat put their hand or any other parts of their body out of the window.
• Always make sure that the side airbag can inflate without inter­
ference.
-Never install seat covers or replacement 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 deploy .
- 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 .
• Objects between you and the airbag can increase the risk of
injury in an accident by interfering with the way the airbag unfolds
or by being pushed into you as the airbag inflates .
- Never place or attach accessories or other objects (such as cup holders, telephone brackets, or even large, bulky objects}
on the doors, over or near the area marked "AIRBAG" on the
seat backrests .
- Such objects and accessories can become dangerous projec­
tiles and cause injury when the supplemental side airbag
deploys.
Controls and equip­ ment Safety first
Vehicle operation
& WARNING (continued)
-Never carry any objects or pets in the deployment space
between them and the airbags or allow children or other
passengers to travel in this position .
• Always use the built -in coat hooks only for lightweight
clothing. Never leave any heavy or sharp-edged objects in the
pockets that may interfere with side airbag deployment and can
cause personal injury in an accident.
• Always prevent the side airbags from being damaged by heavy
objects knocking against or hitting the sides of the seatbacks.
• The airbag system can only be triggered once. If the airbag has
been triggered, the system must be replaced by an authorized
Audi dealership.
• Damage (cracks, deep scratches etc.} to the original seat covers
or to the seam in the area of the side airbag module must always
be repaired immediately by an authorized Audi dealer.
• If children are seated improperly, their risk of injury increases
in the case of an
accident => page 243, "Child Safety".
• Never attempt to modify any components of the airbag system
in any way.
• 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 .
Vehicle care Do-it-yourself service Technical data

___ A_ ir_b _a_ g;::;_ s-=-- y_s _t _e _m _________________________________________________ _
& WARN ING (c ontinued)
- Alwa ys hav e w ork on the do ors done by an auth ori zed Audi
de ale r or qualified work shop . •
Side curtain airbags (SIDEGUARD™)
Description of SIDEGUARD™ airbags
The SIDEGUARD™ airbag system can provide supple­
mental protection t o properly restrained occupants.
Fig . 23 8 SIDEG UARD ™
s y st em , dri ve r's si de:
s id e c urt a in airb ag
l oca tio n
The side curtain airbags are located on both sides of the interior
above the front and rear side
windows=> fig. 238 . 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 occupan ts' heads and upper
torso on the side of the vehicle that is struck in a s ide 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
this rate is below the reference value programmed into the con trol
unit, the side airbags wi ll 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 considerab
ly
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 241 , "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 tha t the side curtain airbags can provide protection .
The airbag system is not a substitute for you r safety belt. Rathe r, it
is part of the overa ll occupant restrain t system in your vehicle .
A lways remember that the airbag system can only 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 209, "General
notes".
I t 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 examp le, swelling, bruising, and minor abrasions
can a lso be associated with these airbags. Remember too, these
airbags will deploy only once and only in certain kinds of accidents
-your safety belts are a lways there to offer protection.
The side curta in airbag system ba sically con sist s of:
• The electronic control module and externa l side impact sensors
• The side curtain airbags above the front and rear side windows
• T he airbag indicator light in the instrument panel
The airbag system is mo nitored elec tronica lly to make certain it is
functioning proper ly at all times . Each time you turn on the ignition,
the airbag system indicator light wi ll come on for a few seconds
(self diagnostics).
T he sid e curtain airbag i s not act ivated:
• if the ignition is turned off,
• in side collisions when the acce leration measured by the sensor
is too low ,
.,_

• in front -end collisions,
• in rear-end collisions,
• in rollovers.
& WARNING
• Safety belts and the airbag system will only provide protection
when occupants are in the proper seating position
=> page 86,
"General recommendations" .
• If the airbag indicator light comes on when the vehicle is being
used , have the system inspected immediately by your authorized
Audi dealer . The side curtain airbag may not work properly even
when the vehicle acceleration in a side collision is high enough to
activate the airbag. •
How side curtain airbags work
Side curtain airbags can work together with side airbags
to help reduce the risk of head and upper torso injuries for
occupants who are properly restrained.
Fig. 239 Illustration of
principle: Inflated side
curtain airbags on the
left side
The side curtain airbags inflate between the occupant and the
windows on the side of the vehicle that is struck in a side coll ision
=>fig. 239 .
Airbag system
When the system is triggered, the side curtain airbag is filled with
propellant gas and breaks through a seam above the front and rear
s ide windows identified by the AIRBAG label. In order to help
provide this additional protection, the side curtain airbag must
inflate within the blink of an eye at very high speed and with great
force . The side curtain airbag could injure you if your seating posi­
tion is not proper or upright or if items are located in the area where
the supplementa l side curtain airbag inflates . This applies espe ­
cially to
children=> page 243.
Although they are not a soft pillow, side curtain airbags can
"cushion" the imp act and in this way they can help to reduce the risk
of injury to the head and the upper part of the body.
A fine dust may develop when the airbag deploys. This is quite
normal and does not mean there is a fire in the vehic le. •
Important safety Instructions on the side
curtain airbag system
Airbags are only supplemental restraints. Always prop­
erly wear safety belts and ride in a proper seating posi­
tion .
There is a lot that you and your passengers must know and do to
help the safety belts and airbags do their job to provide supple­
mental protection.
& WARNING
Improperly wearing safety belts and improper seating positions
increase the risk of serious personal injury and death whenever a
vehicle is being used .
• Never let occupants place any parts of their bodies in the area
from which the side curtain airbags inflate.
• Always make sure that the side curtain airbags can inflate
without interference . Unsuitable accessories fitted inside the
Vehicle care I I irechnical data