2008 AUDI S8 airbag off

Because the passengers of this vehicle are not using safety belts
=> page 210, fig. 220, they will keep moving at the same speed the
vehicle was moving just before the crash, un til some thing stops
them
-here, the wall ~ page 210, fig. 221.
The same principles apply to people sitting in a vehicle that is involved in a frontal collision. Even at city speeds of 20 to 30 mph
(30 to 50 km/h), the forces acting on the body can reach one ton
(2,000 lbs, or 1,000 kg) or more . A t grea ter spe eds, these forc es are
even higher.
People who do not use safety bel ts are also no t attached to their
vehicle. In a frontal collision they will also keep moving forward at
the speed their vehicle was travelling just before the crash. Of course, the laws of physics don't just apply to frontal collisions, they
determine what happens in all kinds of accidents and collisions. •
What happens to occupants not wearing
safety belts?
In crashes unbelted occupants cannot stop themselves
from flying forward and being injured or killed. Always
wear your safety belts!
Fig . 222 A driver not
wearing a safety belt is
violently thrown
forward
Safety belts
Fig . 223 A rear
passenger not wearing
a safety belt will fly
forward and strike the
driver
Unbelted occupants are no t able to resist the tremendous forces of
impact by holding tight or bracing themselves. Without the benefit
of safety restraint systems, the unrestrained occupant will slam
violently into the steering wheel, instrument panel, windshield, or
whatever else is in the
way~ fig. 222 . This impact with the vehicle
interior has all th e energy th ey had just before the crash.
Never rely on airbags alone for protection. Even when they deploy,
airbags provide only additional protection. Airbags are not
supposed to deploy in all kinds of accidents. Although your Audi is
equipped with airbags , all vehicle occupants, including the driver,
must wear safety belts correctly in order to minimize the risk of
severe injury or death in a crash .
Remember too , that airbags will deploy only once and that your
safety belts are always there to offer protection in those accidents
in which airbags are not suppos ed to deploy or wh en they have
already deployed. Unbelted occupants can also be thrown out of the
vehicle where even more severe or fatal injuries can occur .
It is also important for the rear passengers to wear safety belts
correctly . Unbelted passengers in the rear seats endanger not only
themselves but also the dr iver and other
passengers => fig. 223. In a
frontal collision they will be thrown forward violently, where they can hit and injure the driver and/or front seat passenger. •
Vehicle care I I Technical data

lfflJ _ ___.:::S:,::a ~f ..::e :..::t Ly _ b~ e:.:.:lt ~s::._ _____________________________________________ _
Safety belts protect
People think it's possible to use the hands to brace the
body in a min or c ollision . It's simply not true!
Fig . 22 4 Driv er is
c orr ectly r est rai ned in
a su dd en braki ng
m aneuver
Safety belts used properly can make a big difference. Sa fety belts
help to keep passengers in their seats, gradually reduce energy
levels app lied to the body in an accident, and help prevent the
uncontrolled movement that can cause serious injuries. In addition,
safety be lts re duce the danger of being thrown out of the vehic le .
Safety belts attach passengers to the car and give them the benefit
of being s lowed down more gently or "softly" through the "give" in
the safety belts, crush zones and other sa fety features engineered
into today's vehicles. By "absorbing" the kinetic energy over a
longer pe riod of time, the sa fety belts make the forces on the body
more "tolerable" and less likely to cause injury .
Altho ugh these examples are based on a frontal co llision, safety
belts can a lso substantially reduce the risk of injury in other kinds
of crashes . So, whether you're on a long trip or just going to the
corner store, a lways buckle up and make sure others do, too. Acci­
dent statistics show that vehicle occupants properly wearing safety
belts have a lower ris k of being injured and a much better chance of
surviving an accident. Properly using safety belts also greatly
increases the abi lity of the supplementa l airbags to do their job in a
collision . For th is reason, wearing a safety belt is legally required in
most countries including much of the United States and Canada. Although your Audi is equipped with airbags, you sti
ll have to wear
t he safety belts provided . Fron t air bags, for example, are activated
only in some frontal collisions. The front a irbags are not activated in
a ll fro ntal co llisions, in side and rear coll isions, in ro ll ove rs or in
cases where there is not enough dece leration through impact to the
front of the vehicle . The sa me goes for the other airbag systems in
you r Aud i. So, always wear your safety belt and make sure every ­
body in your vehic le is properly restrained! •
Important safety instructions about safety
belts
Safety belts must always be correctly posi tio ned across
t he strongest bones of your body.
- Al ways wear safety belts as illust rated and described in
th is chapte r.
-Make s ure tha t yo ur sa fety be lts ar e always ready for us e
and are not damage d.
& WARNING
Not wearing safety belts or w earing them improperl y increas es
the risk of serious per sonal injury and death . S afety belts ca n work
onl y when used corre ctl y.
• Alway s fa sten your s afety belt s correctly before driving off and
make sure all p assengers ar e correctly restrain ed.
• For ma ximum protect ion , safet y belts must always be po si­
tioned properly on the body .
• Never strap more than one person , including sm all ch ildren ,
into any belt.
• Never pla ce a safety belt ove r a child sitting on your lap .
• Alway s keep feet
in the footwell in front of the seat while the
vehicle is being driven .
.,_

___ A_ ir_b _ a_ g=- s-a. y_s _t _e _m _________________________________________________ _
Child restraints on the front seat - some important things to know
- Be sure to read the important information and head the WARNINGS for important details about c hildren and
Advanced
Airbags=> page 243.
Even though your vehic le is equipped with an Advanced Airbag
System, make certain that a ll children, especia lly those 12 years and
younger, a lways ride in the back seat proper ly restrained for their
age and size . The airbag on the passenger side makes the front seat
a potentia lly dangerous place for a child to ride. The front seat is not
the safest p lace for a child in a forward -facing chi ld seat. It can be a
very dangerous place for an infant or a child in a rearward -fac ing
seat.
The Advanced Ai rbag System in your vehicle has been certified to
comply with the Requirements of United States Federal Motor
Vehicle Safety Standard 208 as applicable at the time your vehicle
was manufactured.
The Standard requires the front airbag on the passenger side to be
t urned off ("suppressed") if a chi ld up to about one year of age
restrained in one of the rear -facing or forward -facing infant
restraints l isted in Federa l Motor Vehic le Safety Standard 208 with
which the Advanced Airbag System in your vehicle was certified has
been insta lled on the front passenger seat. For a listing of the child
restraints that were used to certify compl iance with the US Safety
Standard
=> page 245.
The PASSENGER AIR BAG OFF l ight in the instrument pane l te lls you
when the front Advanced Airbag on the passenger side has been
t urned off by the electronic co ntrol unit.
Each time you turn on the ignition, the
PA SS ENGER AIR BAG OFF
light will come on for a few seconds and :
• will stay on if the front passenger seat is not occup ied, •
will stay on if there is a small child or chi ld restraint on the front
passenge r seat,
• will go off if the front passenger seat is occupied by an adult as
r egis tered by the weight-sensi ng
m at => page 229, "Monitoring the
Advanced Airbag System" .
The
PASSENGER AIR BAG OFF light comes on when the contro l unit
detects a tota l weight on the front passenger seat that requires the
front airbag to be turned off.
I f the to tal weight on the front passe nger seat is m ore than tha t of
a typ ica l 1 year -old child but less than the weight of a small adult,
t he fron t airbag on the passe nger side can dep loy (the
PAS SENGER
AIR BAG OFF
light does not come on). If the PASSEN GER AIR BAG
OFF
light does not come on, the front airbag on t he passe nger s ide
has not been turned off by the electronic contro l unit and can
deploy if the control unit senses an impact t hat meets the condi­
tions stored in its memory.
For example , the airb ag m ay deploy if :
• a small ch ild that is heavier tha n a typ ical 1 yea r-o ld child is on
the front passenger seat (regardless of whether the child is in one
of the child seats
l isted => page 245), or
• a child who has outgrown chi ld restraints is on the front
p asse nger seat.
I f the front passe nger airbag is turned o ff, the
PASSENGER AIR BAG
OFF
light comes on in the instrument cluster and stays on.
T he front a irbag o n th e passenger s ide may
not deploy (the
PASSENGER AIR BAG OFF l ight does not illuminate and stay lit) even
if a smal l adult or teenage r, o r a passenger wh o is n ot sitting uprigh t
with their back against a non -reclined backrest with their feet on the
vehic le floor in front of the seat is o n the front passenge r seat
=> page 200, "Proper seating pos it ion for the driver".
I f the front passenger airbag deploys, the Federa l Standard requires
the airbag to meet the "low risk" deployment cr iteria to reduce the
risk of injury through interaction with the airbag. "Low risk" deploy­
ment occu rs in those crashes that take place at lower decelerations
~

as defined in the elec tronic control unit~ page 230 , "PA SSENGER
AI R BAG OFF ligh t".
A lways r em ember, a ch ild seat or infant carrier install ed on th e 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 fr ontal co llisio n. T he airb ag co uld
greatly reduce the effectivenes s of the chi ld restraint and even seri ­
ously inju re t he c hild duri ng i nflatio n .
F or this reason, and because the bac k seat is the safest place for
chi ldr en -w hen pro perly res traine d acc ording to th eir age an d size
- w e stron gly recomm end that c hildren a lways sit in th e bac k seat
~ page 243, "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 car rier 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
Airbag system
&, 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 229 , "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

Airbag system -
--------------=---=--
& WARNING (continued)
• Airbag work most effectively when used with properly worn
safety belts.
• Therefore, always wear your safety belts and make sure that
everybody in your vehicle is properly restrained.
& WARNING
A person on the front passenger seat, especially infants and small
children, will receive serious injuries and can even be killed by
being too close to the airbag when it inflates.
• Although the Advanced Airbag System in your vehicle is
designed to turn off the front passenger airbag if an infant or a
small child is on the front passenger seat, nobody can absolutely
guarantee that deployment under these special conditions is
impossible in all conceivable situations that may happen during
the useful life of your vehicle.
• The Advanced Airbag System can deploy in accordance with
the
"low risk" option under the U.S. Federal Standard if a child that
is heavier than the typical one-year old child is on the front
passenger seat and the other conditions for airbag deployment
are met.
• Accident statistics have shown that children are generally safer
in the rear seat area than in the front seating position.
• For their own safety, all children, especially 12 years and
younger, should always ride in the back properly restrained for
their age and size. •
Advanced front airbag system
Your vehicle is equipped with a front Advanced Airbag System in
compliance with United States Federal Motor Vehicle Safety Stan ­
dard 208 as applicable at the time your vehicle was manufactured.
Controls and equip­ ment Safety first Vehicle operation
The
front Advanced Airbag System supplements the safety belts to
provide additional protection for the driver's and front passenger's
heads and upper bodies in frontal crashes . The airbags inflate only
in frontal impacts when the vehicle deceleration is high enough.
The front Advanced Airbag System for the front seat occupants is
not a substitute for your safety belts . Rather, it is part of the overall
occupant restraint system in your vehicle. Always remember that
the airbag system can only help to protect you, if you are sitting
upright, wearing your safety belt and wearing it properly. This is why
you and your passengers must always be properly restrained, not
just because the law requires you to be.
The Advanced Airbag System in your vehicle has been certified to
meet the "low risk" requirements for 3 and 6 year -old children on the
passenger side and very small adults on the driver side. The low risk
deployment criteria are intended to help reduce the risk of injury
through interaction with the front airbag that can occur, for
example, by being too close to the steering wheel and instrument
panel when the airbag inflates.
In addition, the system has been certified to comply with the
"suppression" requirements of the Safety Standard, to turn off the
front airbag for infants 12 months old and younger who are
restrained on the front passenger seat in child restraints that are
listed in the
Standard=> page 245, "Child restraints and Advanced
Airbags".
"Suppression" requires the front airbag on the passenger side to be
turned off if:
• a child up to about one year of age is restrained on the front
passenger seat in one of the rear-facing or forward-facing infant
restraints listed in Federal Motor Vehicle Safety Standard 208 with
which the Advanced Airbag System in your vehicle was certified. For
a listing of the child restraints that were used to certify your
vehicle's compliance with the US Safety
Standard => page 245,
• weight less than a threshold level stored in the control unit is
detected on the front passenger seat.
~
Vehicle care Do-it-yourself service Technical data

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When a person is detected on the front passenger seat, weighing
mor e tha n the to ta l w eigh t of a c hild th at is a bout 1 year old
restrain ed in one of th e rear -facing or forward -fac ing infant
r es trai nts (l isted in Fede ra l M oto r Veh icle Safe ty Sta ndard
208 wi th
which the Advanc ed Airba g Syst em in your ve hic le was certified),
the fro nt airbag on the pas se nge r si de may o r may not de ploy .
The
PASSENGER AIR BAG OFF li g ht com es on when the elec troni c
contro l unit detects a total weight on the front passenger seat that
r e qui res th e front airb ag to b e turned off. If th e
PASSENGER AIR BAG
OFF
li g ht does not com e on, the front airbag on the pass enger side
h as not b een t urn ed off by the c ont rol unit and can d eploy if th e
control unit senses an impact that meets t he conditions stor ed in its
mem ory.
If the t otal weig ht on the fro nt passe nger seat is m ore than that of
a typical
1 y ear -old, but less than the we ight of a small adult, the
fr ont air ba g on th e passen ger side m ay depl oy (the
PASSENGER AIR
BAG OFF
li ght does not come on).
For example, the airbag may deploy if:
• a sma ll chil d th at is heav ie r th a n a ty pica l 1 yea r-old chi ld is o n
the front passenge r seat (regardless of w hether the child is in one
o f the chi ld seats lis ted
=> p ag e 24 5),
• a child who h as out grown child r estr ain ts is on th e fron t
passen ger seat.
I f the front passenge r airba g is turned off, the
PASSENGER AIR BAG
OFF
li g ht in the ce nter of t he ins trum ent p anel will com e on and stay
o n.
The fro nt airb ag o n the pa ssenge r sid e may
not de plo y (t he
PASSENGER AIR BAG OFF lig ht does not illumi nate a nd sta y li t) if:
• a small adu lt or teenager is on the front passenger seat
• a pass enge r w ho i s no t si tti ng upright wi th their back aga inst a
non -reclined bac krest with their feet on the vehicle f loor in front of
the sea t is o n the front pass enger se at.
I f the front passenger ai rbag deploys, the Fed era l S tanda rd requ ires
th e a irbag to m eet th e "low risk " de ploy ment c rit eri a to he lp reduc e th
e risk of injury throu gh interaction with th e airbag . "Low risk"
dep loyment oc cur s in th ose cras hes tha t take p lace at l ow er decel ­
e rations as defined in t he elect ron ic co ntro l
unit=> page 22 9.
Always remember : Even th ough yo ur veh icle is eq uipped w ith
A dv anced Airbags, the safest plac e for chil dren i s properly
r estra ined on the back seat. Please be su re t o read t he important
i n form atio n in th e sec tions th at f oll ow and be su re to heed all of the
W ARNING S.
& WARNING
To reduce the risk of injury when an airbag inflates, always wear
safety belts properly.
• If you are unrestrained, leaning forward, sitting sideways or out
of position in any way, your risk of injury is much higher .
• You will also receive serious injuries and could even be killed if
you are up against the airbag or too close to it when it inflates
-
even with an Advanced Airbag => page 218.
& 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 .
• Although the Advanced Airbag System in your vehicle is
designed to turn off the front airbag when a rearward -facing child
restraint has been installed on the front passenger seat , nobody
can absolutely guarantee that deployment is impossible in all
conceivable situations that may happen during the useful life of
your vehicle.
• 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 rearward -facing child restraints in the back seat .
~

Airbag system -
--------------=---=--
& WARNING (continued)
• 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.
& 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
The front passenger seat in your vehicle has a lot of very important
parts of the Advanced Airbag System in it. These parts include the
weight -sensing mat, sensors, wiring, brackets, and more. The func ­
tion of the system in the front passenger seat is checked by the elec­
tronic control unit when the ignition is on. The control unit monitors
the Advanced Airbag System and turns the airbag indicator light on
when a malfunction in the system components is detected. The
function of the airbag indicator light is described in greater detail below . Because the front passenger seat contains important parts
Controls and equip­
ment Safety first Vehicle operation
of the Advanced Airbag System, you must
take care to prevent it
from being damaged. Damage to the seat may prevent the
Advanced Airbag for the front passenger seat from doing its job in
a crash.
The front Advanced Airbag System consists of the
following:
• Crash sensors in the front of the vehicle that measure vehicle
acceleration/deceleration to provide information to the Advanced
Airbag System about the severity of the crash.
• An electronic control unit, with integrated crash sensors for front
and side impacts. The control unit "decides" whether to fire the
front airbags based on the information received from the crash
sensors. The control unit also "decides" whether the safety belt
pretensioners should be activated.
• An Advanced Airbag with gas generator for the driver inside the
steering wheel hub.
• An Advanced Airbag with gas generator inside the instrument
panel for the front passenger.
• A weight -sensing mat under the upholstery padding of the front
passenger seat cushion that measures the total weight on the seat.
The information registered is sent continuously to the electronic
control unit to regulate deployment of the front Advanced Airbag on
the passenger side .
• An airbag monitoring system and indicator light in the instru­
ment
cluster => page 229.
• The PASSENGER AIR BAG OFF light comes on and stays on in the
center of the instrument
panel => page 230, fig. 233 and tells you
when the front Advanced Airbag on the passenger side has been
turned off .
• A sensor below the safety belt latch for the front seat passenger
to measure the tension on the safety belt . The tension on the safety
belt and the weight registered by the weight-sensing mat help the
control unit
"decide" whether the front airbag for the front
passenger seat should be turned off or
not=> page 220, "Child
restraints on the front seat
-some important things to know". .,_
Vehicle care Do-it-yourself service Technical data

___ A_ ir_b_ a_ g
=-- s
--a. y_s _t _e _m _________________________________________________ _
• A s ensor in the safety belt latch for the driver and for the front
s eat pass enger tha t sen ses wheth er that safe ty bel t i s la tc hed or not
and transm its this information to t he el ectron ic control unit .
& WARNING
Damage to the front passenger seat can prevent the front airbag
from working properly .
• Improper repair or disassembly of the front passenger and
driver seat will prevent the Advanced Airbag System from func ­
tioning properly.
• Repairs to the front passenger seat must be performed by qual­
ified and properly trained workshop personnel .
• Never remove the front passenger or driver seat from the
vehicle .
• Never remove the upholstery from the front passenger seat.
• Never disassemble or remove parts from the seat or disconnect
wires from it .
• Never carry sharp objects in your pockets or place them on the
seat .
If the weight-sensing mat in the passenger seat is punctured
it cannot work properly.
• Never carry things on your lap or carry objects on the
passenger seat . Such items can increase the weight registered by
the weight-sensing mat and send the wrong information to the
airbag control unit .
• Never store items under the front passenger seat . Parts of the
Advanced Airbag System under the passenger seat could be damaged , preventing them and the airbag system from working
properly.
• Never place seat covers or replacement upholstery that have
not been specifically approved by Audi on the front seats.
• Seat covers can prevent the Advanced Airbag System from
recognizing child restraints or occupants on the front passenger
seat and prevent the side airbag
in the seat backrest from
deploying properly.
& WARNING (continued)
• Never use cushions, pillows, blankets or similar items on the
front passenger seat . The additional padding will prevent the
weight-sensing mat in the seat from accurately registering the
child restraint or person on the seat and prevent the Advanced
Airbag System from functioning properly .
• If you must use a child restraint on the front passenger seat
and the child restraint manufacturer's instructions require the use
of a towel , foam cushion or something else to properly position
the child restraint, make certain that the PASSENGER AIR BAG OFF
light comes on and stays on whenever the child restraint is
installed on the front passenger seat .
• If the PASSENGER AIR BAG OFF light does not come on and stay
on , immediately install child restraint in a rear seating position
and have the airbag system inspected by your Audi dealer.
•
How the Advanced Airbag System
components work together
T he front Advanc ed Airba g Syst em and th e side airba gs supplement
t h e p rotection offered by the fro nt three -point safety belt s with
pretens ioners and load limiters and t he adjustab le head restraints
to help reduce the risk of in jury in a w ide range of acc ident and
cras h situat ions. Be sure to read the im por tant in form ation abo ut
safety and heed the WAR NINGS in this chapter.
Depl oyment of the Adva nced Airb ag Sys tem and the activa tio n of
the safety be lt pretensioners depend on the deceleration measured
b y th e c ra sh sen so rs and regi stere d by the elec tro nic c ontro l u nit.
C rash severity d epends on speed and dece leration as w ell as the
m ass a nd stiffness of t he vehicle o r object i nvo lve d in the c ra s h .
When t he elec tron ic contro l unit regist er s a lo w seve rity c rash a nd
the safety belt is be ing used, the a irbag wi ll not deploy . If the safety
b elt is not being u se d, the first s ta ge de ploys, f ollow ed by the
second stage after a much later time in t he crash sequence .
.,,_