2013 AUDI A8 airbag

166 Airbag sys te m
removing, servicing or repairing a part in an
area of the vehicle can damage a part of an
a ir bag system and prevent that system from
working properly in a co llision.
There are some important things you have to know to make sure that the effectiveness of
the system will not be impa ired and that dis­
carded components do not cause injury or pol­ lute the env ironment.
A WARNING
Improper care, servicing and repair proce­
dures can increase the risk of personal in­
jury and death by preventing an airbag from deploy ing when needed or deploying
an airbag unexpectedly:
- Never cover, obstruct, or change the
steering wheel horn pad or airbag cover
or the instrument pane l 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 deaning the horn pad or instrument
pane l, use only a soft, dry cloth or one
moistened with plain water. Solvents or
cleaners cou ld damage the airbag cover
or change the stiffness or strength of the
material so that the airbag cannot de­
ploy and protect properly.
- Never repa ir, adjust, or change any parts
of the airbag system .
- All work on the steering wheel, instru­
ment pane l, 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 veh icle body.
- Always make su re that the side airbag
can inflate without interference: -
Never install seat covers or rep lace­
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 orig inal seat covers or
to the seam in the area of the side air­
bag module must a lways be repaired
immediately by an author ized Audi
dealer.
- The airbag system can be activated only
once. After an airbag has inflated, it
must be replaced by an authorized Aud i
dealer or qualified technician who has
the technical information, training and
specia l 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 serv ice 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 c ircuit inter­
rupter must only be performed by a
qualified dea ler -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
s ioners might be classif ied as Perchlorate
Material -special handling may apply, see
www .dtsc .ca.gov/hazardouswaste/per­
ch lorate. When the veh icle or parts of the
rest raint system including airbag modu les .,.

and safety belts with pretensioners are
scrapped, all applicable laws and regula­
tions must be observed. Your authorized
Audi dealer is familiar with these require­
ments 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,
lowering 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
unit. 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 deploy 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 possible 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-
Airbag system 167
formance and increase the risk of serious
personal injury in a crash.
- Never install suspension components
that do not have the same performance characteristics as the components origi­nally 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 e lectronic 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 can provide supple­
mental protection to properly restrained
front seat occupants.
Fig . 169 Driver 's knee airbag
The driver knee airbag is in the instrument
panel underneath the steering wheel
¢ fig . 169, 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.
Ill-

168 Airbag sys tem
If the front airbags deploy, the knee airbags
a lso deploy in frontal co llisions when the de ­
p loyment threshold stored in the contro l unit
is met c:>
page 161, More important things to
know about front airbags.
In addition to their normal safety function,
safety belts he lp keep the driver or front pas­
senger in posit ion in a frontal collis ion so that
the airbags can prov ide supplemental protec­
tion .
The airbag system is not a subst itute for your
safety belt. Rather, it is part of the overall oc­
cupant restraint system in your veh icle. Al­
ways remember that the airbag system can
only help to protect you if you are wearing
your safety be lt and wear ing it properly . Th is
is w hy you shou ld always wear your safety
be lt, not just because the law requires yo u to
do soc:>
page 144, General notes.
The safety belt buck le for the dr iver and front
seat passenge r have switches that te ll t he a ir­
bag control mod ule if the safe ty belt is being
used or no t. If the safety be lt is being used,
the knee airbag will deploy at a slightly higher rate of deceleration than if the belt is not be­
ing used. Therefore, in a partic ular 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 position where the
safety belt is not be ing used .
Remember too, airbags will deploy only once
and only in certain kinds of accidents -your
safety be lts are always there to offer protec ­
tion in those acc idents in which a irbags a re
not supposed to deploy or when they have a l­
ready deployed, fo r example whe n your veh i­
cle st rikes or is str uck by another after the
first coll is ion .
This is just one of the reasons why an a irbag is
n ot a substitute for the safety belt. The airbag
sys tem works mos t effective ly when used wi th
the safety belts. Therefore, always wear your
safety be lts correctly.
It is impor tan t to remember that whi le the
supp lemental knee a irb ag sys tem is designed
to reduce the like lihood of serious injur ies, othe
r injur ies, for example, swelling, bru is ing
and minor abrasions and friction b urns can a l­
so occur when an airbag inflates .
The knee airbag system basically consists
of:
-The e lectronic control module
- Two in flatable a irbags (a irbag an d gas gen-
erator), one for the driver and o ne for the
front passenger
- The a irbag indicator light in the instr ument
pane l
The knee airbag system will not deploy:
-when t he ignit ion is switched off
- in frontal collisions when the deceleration
measured by the control un it is too low
- in side co llisions
- in rear-end collisions
- in rollovers
- in the event of a system malfunction (war n-
ing/ind icator light is on)
¢ page 18.
A WARNING
-
-Safety belts and the airbag system can
only provide protection when occupants
are in the proper seating position
<:>page 161.
-If the airbag ind icator light <:> page 18
comes when the ve hicle is being used,
have the system inspected immediately
by you r authori zed A udi dealer. It is pos­
sible tha t the airbag will inflate when it
is not supposed to, or will not infl ate
when it should.
-

How knee airbags work
The risk of injury to the leg area con be re­
duced by fully inflated knee airbags.
Fig. 170 Inflated airbags protecting in a fro ntal coll i­
sio 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
collisions .
If the front airbags deploy, the knee airbags
also deploy in frontal collisions when the de­
ployment threshold stored in the control unit
is met .
When the system deploys, the airbags fill
with a propellant gas, and inflate between the
lower part of the instrument panel and the
driver and the lower part of the instrument
panel and the front passenger~
page 161,
fig . 167.
Although they are not a soft pillow, they can
"cush ion" the impact and in this way they can
help to reduce the risk 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 realize that
the airbags have deployed . The airbags also
inflate with a great deal of force and it is im­
portant for occupant safety that nothing
should be in their way when they deploy.
Fully inflated airbags in combination with
properly worn safety belts slow down and lim­
it the occupant's forward movement and help
to reduce the risk of injury.
Airbag system 169
Important safety instructions on the
knee airbag system
Airbags ore 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 supplemental protection.
_& WARNING
An inflating knee airbag can cause serious injury. Wearing safety belts incorrectly and
improper seating positions increase the
risk of serious personal injury and death
whenever a vehicle is being used.
- The knee airbag system cannot protect
you properly if you a re seated too close
to any of the airbag locations. When ad­
justing their seat positions, it is impor­
tant that both the driver and the front
passenger keep their upper bodies and
knees at the following minimum 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 injury increases if
you lean forward or to the side, or if the
seat is improperly positioned and you are not wearing your safety belt. The risk in­
creases even more should the airbag de­ ploy.
- Always make sure that the knee airbag
can inflate without interference. Objects
between you and the airbag can increase
the risk of injury in an accident by inter­
fering with the way the airbag deploys or
by being pushed into you as the airbag
deploys.
- Never let anybody, especially children
or animals ride in the footwell in front

1 7 0 Airbag system
of the passenger seat. If the airbag de­
ploys, this can resu lt in serious or fata l
injuries.
- Never carry objects of any kind in the
footwell area in front of the driver's or
passenger's seat. Bulky objects (shop­
p ing bags, for examp le) can interfere
with or p revent proper dep loyment of
the airbag . Small objects can be
thrown through the vehicle i f the a ir­
bag deploys and injure you or yo ur pas­
sengers.
- Make sure there are no cra ck s, deep
scratches or ot her damage in the area of
the instrument pane l where the knee air­
bags are located .
- If children are incorrect ly sea ted, their
risk of inj ury i ncreases in a collision
¢ page 176, Child Safety .
Side airbags
Description of side airbags
The airbag system can provide supplemental
protection to properly restrained occupants.
----
Fi g. 1 71 Side a irbag loca tion in the driver's seat
The side airbags are lo cated i n the sides of the
front seat ba ckrests
¢fig. 171 and the rear
backrest facing the doors. They are identified
by the word "AIRBAG" .
The s ide airbag system ba sically consis ts 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 ins trument
cluster .
T he airbag system is mon itored elec tronically
to make certain tha t it is f unctioning p roperly
at all times. Each time you switch on the igni ­
tion, the airbag system indicator light will
come on for a few seconds (se lf diagnostics) .
T he 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
u pper torso on the side of the vehicle that is
struck in a side collision. The airbag dep loys
only in side impacts and only when the vehicle
acce lerat ion reg istered by the contro l unit is
high enough. If this rate is be low the refe r­
ence value p rog rammed into the control unit,
the side ai rbags will not be triggered, even
t h ough the car may be bad ly damaged as a re­
s ul t of the co llision. It is not possib le to de­
fine an airbag triggering range that will cover every possib le ang le of impact, since the cir­
cumstances will vary cons iderably 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. ¢
page 172, Important
safety instructions on the side airbag system .
Aside from their normal safety function, safe­
ty be lts work to help keep the driver or front
passenge r in position in t he event of a s ide
co llision so that the side airbags can provide
protection.
The airbag system is
not a substitute for your
safety belt . Rather, it is part of the overa ll oc­
c u pant restraint system in you r vehicle . A l­
ways remember that t he side ai rbag system
c a n only help to protect you if you are wea ring
your sa fety be lt and wearing it p roperly. This
is another reason why you should always wear
your safety belts, not j ust because the law re­
quires yo u to do so¢
page 144, General
notes.
It is important to remembe r that w hile the
supplementa l side airbag system is designed
to reduce the likelihood of ser ious injuries,
other injur ies, for example, swelling, bru is ing, ..,..

and minor abrasions can also be associated
with deployed side airbags. Remember too,
side airbags will deploy only once and on ly in
certain k inds of accidents -your safety belts
are always there to offer protect ion.
Vehicle damage, repair costs or even the lack
of vehicle damage are not necessar ily an indi ­
cation of over-sensitive or failed airbag activa­
tion . In some collisions, both front and s ide
a irbags may inf late . Remember too, that air ­
bags will deploy only once and only in certain
kinds of collisions -your safety belts are al­
ways there to offer protect ion in those acci­
dents in wh ic h airbags are not supposed to
deploy or w hen they have already deployed .
The side airbag system will not depl oy :
- when the ignition is switched off
- in s ide collisions when the acceleration
measured by the sensor is too low
- in front-end collisions
- in rear-end collisions
- in ro llovers.
I n some types of a ccidents the front a irbags,
side curta in a irbags and side airbags may be
triggered together.
A WARNING
- Safety belts and the airbag system will
only provide protection when occupants
are in the proper seating posit ion
<=)page 172.
- If the airbag indicator light Q page 18
comes when the vehicle is be ing used,
have the system inspected immediately
by you r aut ho rized Aud i dealer. It is pos­
sible that the a irbag will inflate when it
is not supposed to, or w ill not inflate
when it should.
-
A irba g sy stem 1 71
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.
Fig . 1 72 Inflated side a irbags on left side of vehicle ,
rear side airbag
When the system is triggered, the a irbag is
filled with propellant gas and breaks through
a seam in the seat surface area ma rked ''AIR­
BAG".
It expands between the side trim panel
and the passenger. In orde r to help provide
th is add it ional protect ion, the side airbag
must inflate within a fraction o f a second at
very high speed and with great force. The sup­
plementa l side airbag could injure you if your
seat ing position is not proper or upright or if
items are located in the area where the sup­
plementa l side airbag expands . This applies
especially to child ren
Q page 176, Child Safe­
ty. Supplemental side airbags inflate between
the occupant and the door panel on the side
of the vehicle that is struck in certa in side co l­
lis ion
Q fig. 172.
Although they are not a soft pi llow, they can
"cushion" the impa ct and in this way they can
help to reduce t he risk of injury to the upper
part o f th e body.
A fine dust may deve lop when the airbag de­
ploys . This is normal and does not mean there
is a fire in the vehicle.

172 Airbag system
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 accordingly to help the
safety belts and airbags do their job to pro­
vide supplemental protection.
& WARNING
An inflating side airbag can cause serious
or fatal injury. Improperly wearing safety
belts and improper seating positions in­
crease the risk of serious personal injury
and death whenever a vehicle is being
used.
- 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 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 176, 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 d rive w ith int erio r door tr im pan­
els removed.
- Never d rive when parts have been re­
moved from t he ins ide door panel and
the openings they leave have not been
p roperly closed.
- Never d rive w hen loudspeakers in the
doors have been removed unle ss the
spea ker holes have been properly
closed.
- Always make cer ta in t hat openings are
covered or filled if additional s peake rs
or other equi pment is i nstalled in the
insi de door panels.
- A lways have work on t he doors done by
a n author ized Audi dealer or qualified
wo rkshop .
Side curtain airbags
Description of side curtain airbags
The side curtain airbag system can provide
supplemental protection to properly restrain ­
ed occupants.
Fi g. 173 Side curtai n airbags, dr iver 's s ide: side curtai n
ai rbag locat ion
The side curtain airbags are located on both
sides of the interior above the front and rear
side windows ¢
fig. 173. They are ident ified
by the word "AIRBAG" on the windshie ld
frame and the center roof p illar.
The side curtain airbag system supp lements
the safety belts and can help to reduce the risk of injury for occupa nts' heads and upper
torso on the side of the veh icle tha t is struc k
Airba g system 173
in a side co llision . The side cu rtain airbag in­
flates in side impacts and only when the vehi­
cle acceleration registered by the contro l un it
is h igh eno ugh. If this rate is below the refer­
ence value programmed into the control unit,
the side airbags will not be triggered, even
though the car may be badly damaged as a re­
su lt of the co llision . It is not possib le to de­
fine an airbag triggering range that will cover every possib le ang le of impa ct, sin ce the cir­
c u mstances will vary cons iderably be tween
one collision and anothe r. Important factors
incl ude, fo r example, the nature (hard or soft)
of the impacting object, the ang le of impact,
vehicle speed, etc . ¢
page 17 4, How side cur­
tain airbags work.
Aside from their normal safety f unction, safe­
ty belts work to help keep the driver or front passenger in position in the event of a coll i­
s ion so that the side curtain airbags can pro­
vide protection .
The airbag system is not a substit ute for your
safety belt. Rather, it is part of the overall oc­ cupant restra int system in your vehicle. Al­
ways remember that the a irbag system can
o nly help to protec t you if you are wear ing
you r safety be lt and wea ring it p roperly. This
i s a nothe r reason why you should a lways wear
yo ur safe ty be lts, no t ju st because the law re­
quires you to do so ¢
page 144, General
notes .
It is impo rtant to remembe r that w hile the
s id e cu rtain air bag system is desig ned to help
reduce t he likelihood of serious injuries, other
injur ies, for examp le, swelling, br uising, and
minor ab rasions can also be associated with
these a irbags upon deployment. Remember
too, these airbags will deploy only once and
o nly in certain kinds of acc idents -your safety
belts are always the re to offer protection .
The side curtain airbag sy stem ba sically
consists of :
-The e lectronic control module and external
side impact sensors
- The side curtain airbags above the front and
rea r side windows