2012 AUDI S8 airbag

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
...

The knee airbag system has been designed so
that the airbags for the driver and front pas­
senger deploy in certain but not all frontal
collis ions .
I f the front airbags deploy , the knee airbags
also deploy in fronta l collis ions when the de ­
p loyment threshold stored in the control unit
is met .
When the system dep loys, the airbags fill
with a prope llant gas, and inflate between the
l ower part of the instrument panel and the
driver and the lower part of the instrument panel and the fron t passenger
c> page 151 ,
fig . 14 7.
Although they are not a soft pillow, they can
"cush ion" the impact and in this way they can
help to reduce the r isk of injury to the lower
extremities .
All of this takes place in the blink of an eye, so
fast that many people don't even reali ze that
t he airbags have deployed . The airbags also
inflate w it h a great deal of force and it is im ­
portant for occupant safety that not hing
should be in the ir way when they dep loy .
Fully infla ted airbags in comb ination with
properly worn safety belts slow down and lim ­
it the occupant's forward movement and help
to reduce the r isk of injury .
Important safety instructions on the
knee airbag system
Airbags are only supplemental restraints. Al­
ways wear safety belts correctly and ride in a
proper seating position .
There is a lot that you and your passengers
must know and do to help the safety belts and
airbags to provide supp lemen tal protection .
& WARNING
An inflating knee airbag can cause ser ious
injury. Wearing safety belts incorrectly and
improper seating positions increase the
r isk of serious personal injury and death
whenever a vehicle is being used.
A irbag system 159
-The knee a irbag system cannot protect
you proper ly if you a re seated too close
to any of the airbag locat ions. When ad­
justing their seat pos itions, it is impor­
tant that both the driver and the front passenger keep the ir upper bod ies and
knees at the following m inimum safe
distances :
- at least 10 inches (25 cm) between the
chest and the steering wheel/instru­
ment panel.
- at least 4 inches (10 cm) between the knees and the lower part of the instru­
ment panel.
- The risk of personal in jury increases if
you lean forward or to the s ide, or if the
seat is improperly positioned and you are
not wearing yo ur safety belt . The risk i n­
creases even more should the ai rbag de­
ploy .
- Always make sure that the knee a irbag
can inflate without inte rfe rence. Objects
between yo u and the airbag can inc rease
the risk of in jury in an accident by inte r­
fering w ith the way the a irbag deploys or
by being p ushed into you as the airbag
deploys.
- Never let anybody, especia lly children
or anima ls ride in the footwell in front
of the passenge r seat. If the airbag de­
ploys, th is can result in serious or fa tal
i njur ies.
- Never carry obje cts of any kind in the
footwe ll area in front of the dr iver's or
passenger 's sea t. Bulky objects (shop ­
ping bags , fo r example) can interfere
with o r prevent proper deployment of
the airbag. Small objects can be
thrown through the ve hicle if the air­
bag deploys and injure you or your pas­
sengers .
- Make sure there are no cracks, deep
scratches or other damage in the area of
the instrument panel where the knee air­
bags are located.
- If ch ildren are incorrectly seated, their
risk of injury increases in a collision
c> page 166, Child Safety .
•
•

160 Airbag system
Side airbags
Description of side airbags
The airbag system can provide supplemental
protection to properly restrained occupants .
---
Fig. 151 Side a irbag locat ion in the dr iver 's seat
The s ide airbags are located in the sides of the
front sea t backrests
c::>fig. 151 and the rear
backrest facing the doors. They are identified
by the word "AIRBAG" .
Th e s ide a irbag syste m basically co nsists of:
- the electronic control module and external
s ide impact sensors
- the two side airbags located in the sides of the front backrests
- two rear side airbags
- the airbag warning light in the instrument
cluster.
The airbag system is monitored electronica lly
to make certain that it is functioning properly
at all times. Each time you switch on the igni­
tion, the airbag system indicator light will
come on for a few seconds (self diagnostics) .
The side airbag system supplements the safe­
ty belts and can help to reduce the risk of in­
jury to the driver's, front and rear passenger's upper torso on the side of the vehicle that is
struck in a side collision . The airbag deploys
only in side impacts and on ly when the veh icle
acceleration registered by the control unit is h igh enough . If this rate is below the refer­
ence value programmed into the control un it,
the side airbags will not be triggered, even
though the car may be badly damaged as a re­
sult of the collision. It is not possible to de ­
fine an airbag triggering range that will cover every possible ang
le of impact, since the cir­
cumstances will vary considerably between
one collis ion and another. Important factors
include, for example, the nature (hard or soft)
of the impacting object, the angle of impact,
vehicle speed, etc.
c::> page 161, Important
safety instructions on the side airbag system .
Aside from their normal safety function, safe­
ty belts work to help keep the driver or front
passenger in position in the event of a side
collision so that the side airbags ca n provide
protection .
The airbag system is
not a substitute for your
safety belt . Rather, it is part of the overall oc ­
cupant restra int system in your vehicle. Al­
ways remember that the side airbag system can on ly help to pro tect you if you are wearing
yo ur safety belt and wearing i t properly. This
is another reason why you should always wear
your safety belts, not just because the law re­
quires yo u to do soc::>
page 134, General
notes.
It i s important to remember that wh ile the
supplementa l side airbag system is designed
to reduce the likelihood of serious injuries,
other injuries, for example, swelling, bruis ing,
and minor abrasions can also be associated
with deployed side airbags. Remember too,
s ide airbags will dep loy only once and only in
certain kinds of accidents - your safety belts
are always there to offer protection .
Vehicle damage, repair costs or even the lack of veh icle damage are not necessarily an indi­
cat ion of ove r-sensitive or failed airbag act iva­
t ion. In some coll is ions, both front and side
airbags may inflate. Remembe r too, that air­
bags will deploy only once and on ly in certain
k inds of collisions -your safety belts are al­
ways there to offer protection in those acci­ dents in which airbags are not supposed to
deploy or when they have already deployed .
The s ide airbag sy stem will not d eplo y:
-when the ignit ion is switched off
- in side co llisions when the acceleration
measured by the se nsor is too low
- in front-end collisions

- in rear-end co llisions
- in ro llovers.
In some types of acc idents the front airbags,
side curta in a irbags and side airbags may be
tr iggered toge ther.
& WARNING
- Safe ty belts and the airbag sys tem will
only prov ide protection when occ upants
are in the p roper seating position
¢page 161.
- If the airbag indicator light comes on
when the vehicle is being used, have the
system inspected immediately by your
authorized Audi dealer. T he a irbag may
not work p roperly when the vehicle ac­
cele ration in a side co llision is high
enough to activa te the airbag.
How supplemental side airbags work
-
Side airbags deploy instantly and can help re­
duce the risk of upper torso injuries for occu­
pants who are properly restrained.
Fi g. 152 Inflated side airbags on left side of veh icle,
rear side airbag
When the system is triggered, the airbag is
f ill ed w it h propellant gas and breaks through
a seam in the seat surface area marked "AIR­
BAG" .
It expands between the side trim pa nel
and the passenger . In order to help prov ide
t his additional protection, the side a irbag
must inf late withi n a frac tion of a second at
very high speed and with grea t fo rce . The sup­
p lemental side airbag could i nju re you if your
seating position is not proper or upr ight or if
items are located in the area where the sup­
plemental side a irbag expands . Th is applies
A irba g sy stem 161
especially to children ¢ page 166, Child Safe ­
ty . Supplemental side airbags inflate between
the occ upant and the door panel on the side
of the vehicle that is struck in certain side col­
lis ion ¢ fig. 152 .
Although they are not a soft pi llow, 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 deve lop when the airbag de­
ploys. T his 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 . Al­
ways properly wear safety belts and ride in a
proper seating position.
There is a lot that you and your passengers must know and act accord ingly to help the
safety belts and airbags do their job to pro ­
vide s upplementa l protect ion .
& WARNING
An in flat ing side a irbag can cause serious
or fata l injury. Impr oper ly weari ng safety
belts and imp roper seat ing pos it ions in­
crease the risk of serious pe rsonal injury
and death whenever a vehicle is bei ng
used .
- In order to reduce the risk of i njur y when
the supplemental side airbag inflates:
-Always sit in an upright posit ion and
nev er lean aga inst th e area whe re the
suppleme nta l side airbag is located.
- Never let a child or anyone e lse res t
their head aga inst the s ide trim pane l
i n the area where t he supplementa l
s ide a irb ag i nflates.
- Always make sure that safety be lts a re
wor n cor rectly,
- Do not let anyone s itting in th e front
seat put the ir hand or any other parts
of thei r body ou t of the window.

162 Airbag system
-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
deploy.
- 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.
- 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, tel­
ephone 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 be­
come dangerous projectiles and cause
injury when the supplemental side air­
bag deploys .
- 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 air­
bag deployment and can cause personal
injury in an accident.
- Always prevent the side airbags from be­
ing damaged by heavy objects knocking
against or hitting the sides of the seat­
backs.
- The airbag system can only be triggered
once. If the airbag has been triggered,
the system must be replaced by an au­ thorized 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 au­
thorized Audi dealer .
- If children are seated improperly, their
risk of injury increases in the case of an
accident
~ page 166, Child Safety.
- Never attempt to modify any compo­
nents of the airbag system in any way .
- In a side collision, side airbags will not
function properly if sensors cannot cor ­
rectly measure increasing air pressure in­
side the doors when air escapes through
larger, unclosed openings in the door
panel.
- Never drive with interior door trim pan­
els removed .
- Never drive when parts have been re­
moved 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.

Side curtain airbags
Description of side curtain airbags
The side curtain airbag system can provide
supplemental protection to properly restrain ­
ed occupants .
Fig. 1 53 Side cur ta in airbags, d river 's side: side curta in
ai rb ag location
The s ide curtain airbags are located on both
sides of the interior above the front and rear
side w indows
r=:> fig . 153 . They are identified
by the word "AIRBAG " on the windshie ld
frame and the center roof p illar.
The s ide curtain airbag system supp lements
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 struc k
i n a side collision . Th e side curta in a irbag in­
flates in s ide impacts and on ly when the veh i­
cle acce leration reg istered by the cont ro l u nit
is high enough . If th is rate is be low the refer ­
ence va lue programmed into the control unit,
the side airbags will not be triggered, even
though the car may be badly damaged as a re­
sult of the collision .
It is not possible to de­
fine an a irbag trigger ing range that w ill cover
eve ry possible angle of impact , since the ci r­
cumsta nces wi ll vary conside rably between
one co llision and ano ther. Import ant factors
include, for e xamp le, the nat ure ( hard o r soft)
of the impacting object, the ang le of impact ,
ve hicle speed, etc .
r=:> page 164, How side cur­
tain airbags work.
Aside from the ir normal safety function , safe ­
ty belts work to he lp keep the dr iver or front
passenger in position in the event of a co lli-
A irba g sy stem 163
sion so that the side curtain airbags can pro­
v ide protection.
T he airbag system is no t a subs titu te for your
sa fe ty be lt . Rather, it is part of the overa ll oc­
c u pant restra int system in your vehicle . A l­
ways remember that the airbag system can
only he lp to protect you if you are wearing
yo ur safety be lt and wearing it properly. This
is another reason why you should always wear
your safety be lts, not just because the law re ­
quires you to do so
r=:> page 134, General
notes .
It is important to remember that wh ile the
s ide curtain airbag system is designed to help
reduce the likelihood of ser ious injuries, other
injur ies, for examp le, swelling, bru is ing, and
minor abrasions can also be associa ted wi th
these airb ags upon deployment. Remember
too, these airbags will deploy only once and
only in certain kinds of acc idents -your sa fety
belts are always there to offer protection.
The side curtain airbag system basically
con sists of:
-The e lectronic control module and external
side impact sensors
- The side curtain airbags above the fron t and
rea r side windows
- The airbag i ndicator light in t he instr ument
pane l
T he airbag system is mo nitored e lectronically
to make ce rtain i t is func tioning prope rly at all
t imes. Each t ime you sw itch on the ign ition,
the ai rbag system indicator light will come on
for a few seconds (self diagnostics).
The s ide curtain airbag is not activated :
-if the ignition is sw itched off,
- in side co llisions when the accele ration
measu red by the sensor is too low,
- in rear-end coll is ions,
- in rollovers.
A WARNING
-,
-Safety belts and the airbag system will
only provide protection when occupants

164 Airbag system
are in the proper seating posit ion
c:> page 54, 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 curta in
airbag may not work prope rly even when
the vehicle acceleration in a side coll is ion
is h igh enough to act ivate 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 . 154 Illustrat ion of principle: Inflated side curtain
a ir bags 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 co llision
~fig. 154.
When the system is tr iggered, the side curtain
a ir bag is filled with propellant gas and breaks
through a seam above the front and rear side
windows identified by the A IRBAG label. In or­
der to help provide this additional p rotection,
the side c urtain airbag must inflate within the
b link of an eye at very high speed and with
great force. The side c urtain airbag cou ld in­
jure you if your seating position is not proper
or upright or if items are located in the area
where the supplementa l side curtain airbag
inflates . This applies espec ial ly to children
~page 166.
Although they are not a soft pillow, side cur­
tain airbags can "cushion" the impact and in
this way they can he lp to reduce the r isk of in - jury to the head and the upper part of the
body.
A fine dust may deve lop when the airbag de­
ploys. This is qui te normal and does not mean
there is a fire in the vehicle .
Important safety instructions on the
side curtain airbag system
Airbags are only supplemental restraints. Al ­
ways properly wear safety belts and ride in a
proper seating position .
There is a lot that you and your passengers
must know and do to he lp the safety belts and
airbags do their job to provide supplemental
protection .
A WARNING ........
Improperly wearing safety belts and im­
proper seating posit ions increase the risk
of ser ious personal inju ry and death when­
ever a vehicle is bei ng used.
- Never let occupants place any parts of
their bod ies in the area from which the
side curta in a irbags inflate.
- Always make sure that the s ide curtain
a ir bags can inflate without interference.
Unsuitable accessor ies fitted inside the
exp ansion range of a s ide cur tain airbag
can dangero usly inter fere w ith its f unc ­
tion. A deploying head airbag develops
enough force to catapu lt any piece of
add-on component out of its path of in­
flation and into the passenger compart­
ment. A n occupant h it by suc h a projec­
tile can suffer serio us injury or death
~ page 283, Technical Modifications.
- Do not swivel the sun visors to the side if
you have any objects clipped onto them
(for examp le pens) .
If the airbag should
deploy, you could be injured by these ob­
jects.
- Use the bu ilt -in coat hooks only for light·
weight clothing. Never leave any heavy o r
sha rp-edged objects in the pockets that
-
may interfere with airbag dep loyment ~