2015 AUDI A3 CABRIOLET warning light

156 Airbag system
How the Advanced Airbag System
components work together
The front Advanced Airbag System and the
side airbags supplement the protection of­
fered by the front three-point safety be lts
with pretensioners and load limiters and the
adjustable head restra ints* to help reduce the
risk of injury in a wide range of acc ident and
crash situat ions. Be sure to read the impor­
tant information abo ut safety and heed the
WARNINGS in this c hapter .
Dep loyment of the Advanced Airbag System
and the activat ion of the safety be lt preten­
sioners depend on the dece lerat ion meas ured
by the c rash senso rs and regis tered by the
e lectronic control u nit. Crash sever ity depends
on speed and deceleration as well as the mass
and stiffness of the vehicle or object involved
i n the c rash.
On the passenger side, regard less of safety
be lt use, the front passenger front al airbag
will be turned off i f the e lectrical capacitance
measured by the capac itive passenger detec­
tion system on the front passenger seat is less
than the amount programmed in the electron­ ic control unit. The front passenger frontal air­
bag will a lso be turned off if the capacitance
measured by the system for the front passen­
ge r seat equa ls that of an infant of abo ut on e
yea r of age i n one of the child sea ts that was
used to cer tify the Advanced Airbag System
under Federal Motor Vehicle Safety Standard
208 . The
PASSENGER AIR BAG OF F light
comes on and stays on to tell you when the
front Advanced A irbag System on the passen­
ger s ide has been turned off¢
page 159.
A WARNING
To reduce the risk of injury when a n airbag
inflates, a lways wear safety belts properly .
- If you are unrestrained, lean ing forward,
sitting sideways or out of position in any
way, your risk of inj ury is much higher.
- You w ill also receive serious injuries and
cou ld even be killed if you are up against
the a irbag or too close to it when it in- flates
-even w ith an Advanced A irbag
¢ page 146.
More important things to know about
front airbags
Fi g. 142 Inflated fro nt a irbags
-...
q :r:
iZ
Safety be lts are important to he lp keep front
seat occupants in the proper seated position
so that a irbags can unfold proper ly and pro­
vide supplemental protect ion in a frontal col­
lis ion .
The front airbags are des igned to provide ad­
ditional protection for the chest and face of
the driver and the front seat passenger when:
- safety belts are worn proper ly,
- the seats have been posi tioned so that the
occupant is properly seated as far as poss i­
b le from the airbag ,
- and for ad justab le head restraints: the head
restraints have been properly ad justed .
B ec au se airb ags inflate in the bli nk of an eye
with great force, th ings you h ave on your lap
or have p laced on the seat co uld become dan ­
gerous pro jecti les, and be p ushed into you if
the a irbag inf lates .
When an airbag deploys, fine dust is re leased.
T his is no rma l and is not caused by a fi re in
the ve hicle . This dust is made up mostly of a
powder used to lubricate the airbags as they
deploy. It could irr itate skin .
It is important to remembe r that while the
supplementa l airbag system is designed to re­
duce the like lihood of serious injur ies, other
injur ies, for examp le swelling, bruising and
minor abrasions, can also happen when air-
bags inflate . A irbags do not protect the arms
IIJI,

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or the lower parts of the body. Front airbags
supp lement the three-point safety belts only
in some frontal collisions in which the vehicle
dece leration is high enough to deploy the air­
bags.
F ront airbag s will no t deplo y:
- if the ignition is switched off when a crash
occurs,
- in side collisions,
- in rear-end collisions,
- in rollovers,
- when the crash deceleration measured by
the a irbag system is less than the m inimum
threshold needed for airbag deployment as
registered by the electronic control unit.
The f ront pas seng er airbag al so will n ot
deploy:
- when the front passenger seat is not occu­
pied,
- when the electrical capac itance measured by
the capacitive passenger detect io n system
for the front passenger seat indicates that
the passenger side frontal airbag must be switched off by the electronic control unit
(the
P AS SENGER A IR BA G OFF light
c:> page 159 and how they work comes on
and stays on).
A WARNING
Sitting in the wrong position can increase
the risk of serious injury in crashes.
- To reduce the r isk of injury when the air­
bags inflate, the driver and passengers
must always sit in an upright posit ion,
must not lean against or place any part
of the ir body too close to the area where
the a irbags are located.
- Occupants who a re unbelted, out of posi­
t ion or too close to the airbag can be se­
riously injured by an airbag as it unfolds
with great force in the blink of an eye
c:> page 148 .
A WARNING
A child in a rearward-facing child seat in­
stalled on the front passenger seat will be
-
A irbag system 157
seriously injured and can be killed if the
front airbag inflates -even w ith an Ad­
vanced A irbag System.
- The inflating airbag will hit the ch ild seat
or infant carrier with great force and will
smash the child seat and child against
the backrest, center armrest, door or
roof.
- Always install rear-fac ing ch ild seats on
the rear seat.
- If you must install a rearward fac ing
child seat on the front passenger seat because of exceptional circumstances
and the
P A SSENGER AIR BAG OFF light
does not come on and stay on, immed i­
ately insta ll the rear-fac ing child seat in a
rear seat ing position and have the airbag
system inspected by your A udi dealer.
A WARNING
r---------
O b j e cts between you and the airbag will
increase the risk of injury in a crash by in­
terfering with the way the airbag unfolds
or by be ing pushed into you as the airbag
inflates.
- Never hold things in your hands or on
your lap when the veh icle is in use.
- Never transport items on or in the area
of the front passenger seat. Objects
could move into the area of the front air­ bags during braking or other sudden ma­
neuvers and become dangerous projec­
tiles that can cause ser ious personal in­
jury if the a irbags inflate.
- Never p lace or attach accesso ries o r oth­
er objects (such as cup holders, te le­
phone b rac kets, large, heavy or bulky ob ­
jects) on the doors, over o r near the area
marked "AIRBAG" on the steering wheel,
instrument panel, seat backrests or be­
tween those areas and yourself . These
objects could cause injury in a crash, es­ pecially when the airbags inflate.
- Never recline the front passenger's seat
to transport objects. Items can also
move into the area of the s ide a irbag or
the front a irbag during braking or in a
•
•

158 Airbag sys te m
sudden maneuver . Objects near the
air bags can become projectiles and cause
injury, particularly when the s eat is re­
cli ned .
- Never place or transport objects on the
front passenger seat. Objects on the
front passenger seat could cause the ca­
pacitive senso r in the seat to s ignal to
airbag system that t he seat is occupied
by a person whe n it in fa ct is not, o r th at
the person on the sea t is he avie r than he
or s he actually is. The change in electric
capacitance because of such objects can
cause the passenger front airbag to be
t ur ned on when it sho uld be off, or can
cause the airbag to work in a way that is
different from the way it wou ld have
worked w ithout ob jects on the seat .
- Always make sure that there is nothing
on the front passenge r seat that will
cause the capaci tiv e passenge r detection
system in the s eat to s ignal to the A irbag
System that t he seat is occupied by a
perso n when it is not, or to sign al that it
is occupied by someone who is heavier
than the person actually sitting on the
seat . The prese nce of an o bject co uld
cause the passenger front a irbag to be
t u rned on when it sho uld be off, or co uld
cause the airbag to work in a way that is
differe nt from the way it wou ld have
worked w it h out the object on the sea t.
.&, WARNING
The fine dust created when a irbags deploy
can ca use b reathing problems for peop le
w ith a hi story of ast hma o r othe r brea th ­
ing conditions .
- T o redu ce the r is k of breathing p rob lems,
th ose w it h a sthma or o ther resp iratory
condit ions shoul d ge t fresh a ir right
away by gett ing out of the vehicle o r
opening windows or doo rs .
- If you are in a coll is ion in which a irbags
dep loy, wash yo ur hands and face w ith
mild soap and water befo re eating . -
Be ca reful not to get the dust into your
eyes, or into any c uts or scratches.
- If the res id ue s hould get into your eyes,
f lush them w ith wate r.
Monitoring the
Advanced Airbag
System
tli Airbag monitor ing indicator light
Two separate indicators monitor the function
of the Advanced Airbag System: the airbag
monitoring indicator light and the
PASSEN­
GER AIR BAG OFF
light.
The Advance d Airbag System as well as the
s ide airbags and side curta in a irbags w ith
eject ion mit igat ion features (including the
electron ic contro l unit, se nsors a nd system
wiring) are all mon itored continuously to
make su re that t hey are functioning p roperly
whenever the ignition is on. Eve ry time you
tu rn o n the ignition, the airbag sys tem indica ­
tor light II will come on fo r a few seconds
(funct ion check) .
The system must be inspected when the
indicator light
II:
- does not come on when the igni tion is
sw itched on,
- does not go out a few seconds after you
have switched on the igni tion, or
- comes on while driv ing .
If an airbag system malfunction is detected,
the indicator lig ht w ill first sta rt flashing to
catch t he d rive r's a ttent io n and the n stay on
c onti nuously to serve as a constant rem inder
to have the sys tem inspected immed iate ly.
If a malfunction occurs that tu rns the front
airbag on the passenge r side off, the
PASSEN ­
GER AIR BAG OFF
light will come on and stay
o n wheneve r th e ign ition is on.

_& WARNING
An airbag system that is not functioning
properly cannot provide supplemental pro­
tection in a frontal crash.
- If the airbag indicator light¢
page 20
turns on when the vehicle is being used,
have the system inspected immediately
by you r auth o riz ed Aud i dea le r. It is pos­
sible that the airb ag will inf late when it
is not s upposed to, or w ill not inflate
when it sho uld .
PASSENGER AIR BAG OFF light
Fig. 14 3 Center console: passenger a irbag off warnin g
light
The PASSENGER AIR BAG OF F light is located
in the center of the instrument panel
¢fig. 143.
The PASSENGER AIR BAG OFF light will come
on and stay on to tell yo u when the front Ad­
vanced A irbag on t he passenger side has been
turned off by the e lectronic control unit. If the
bulb for the
PASSENGER AIR BAG OFF light
burns out, the a irbag indicator light
fl w ill
come on to signal a malfunction in the Ad­
vanced A irbag System . Although the bur ned­
out b ulb will not cha nge the way the front
passenger's frontal airbag wor ks, it w ill no
l onge r be possib le to use the
PAS SENGER AIR
BAG
OFF light to make sure that the airbag
on/off stat us is correct for the occupant on
the front passenger seat. Have the airbag sys­
tem inspected immed iate ly by your author-
~ ized Audi dealer.
r--.
iii The PASSENGER AIR BAG OFF light will blink rl
:5: for about 5 seconds when :
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Airba g sy stem 159
- the ignition is sw itched on and
- t he capaci tive passenger detection system,
which switches the front seat passenger's
frontal Advanced Airbag on and off, detects a change in the status of the front passen­
ger seat.
As soon as the
PASSENGER AIR BAG OFF
light stops blink ing, a lways make sure that
the ai rbag status (on or off) as shown by the
PASSENGER AIR BAG OFF light is proper for
the age, size and electrical capacitance of the
person occupying the front passenger seat.
Always make sure that the safety belt for the
front passenger seat is properly fastened.
The PASSENGER AIR BAG OFF l ight will
show the status of the front sea t passenger 's
fronta l Advan ced Airbag a fe w se conds after
th e ignition i s sw itched on and th e airbag in­
dicator light goes off. The PASSENGER AIR
BAG
OFF light :
- will stay on if the front passenger seat is not
occupied;
- will stay on if the electrical capacitance
meas ured by the capacitive passenge r de­
tect io n system for the fron t passenger s eat
equa ls the comb ined capacitance of an in­
fa nt up to about one year of age and one of
t he rearwa rd- facing or forward-fa cing ch ild
restraints listed in Fede ral Motor Vehicle
Safety Standard 208 with which the Ad­
vanced Airbag System in your vehicle was
cert ified; For a listing of the child restraints
that were used to certify your vehicle's com­
pliance w ith the U.S. Safety Standard
~page 171 .
-will go out if the fro nt passenge r seat is oc­
cupied by an adult as registered by the ca­
pacitive passenger detection system .
- The
PASSENGER AIR BAG OFF light must
come on and stay on if the ignition is on
and ...
- a car bed has been installed on the front passenger seat, or
- a rearwa rd-facing child rest ra int has been
installed on the front passenger seat, or
- a forward-facing child restrai nt has been in-
stalled on the front passenger seat, .,,.

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on the front passenger seat that might cause the capa citive passenger detecti on
system to miscalcu late electrical capac i­
tance.
Important safety instructions on
monitoring the Advanced Airbag System
A WARNING
- If the status of the Adv a need Airb ag Sys­
tem has changed while the vehicle is
moving, the
PASSENGER AIR BAG OFF
light b links for about S seconds to catch
the driver's attent ion. If this happens, al­
ways stop as soon as it is safe to do so
and check the steps described above .
- If the
PASSENGER AIR BAG OFF light
does not go off when an adult who is not
very small is sitting on the front passen­ ger seat after taking the steps descr ibed
above, make sure the adult is properly
seated and restrained at one of the rear seating pos it ions. Have the a irbag sys­
tem inspected by your authorized Audi
dealer before transporting anyone on the
front passenger seat .
A WARNING
An airbag system that is not funct ioning
properly cannot provide supplemental pro­
tection in a frontal crash.
- If the airbag indicator light
c> page 20
turns on when the vehicle is being used,
have the system inspected immediately
by you r autho rized Aud i dea le r. It is pos­
sible that the a irbag will inf late when it
is not s upposed to, or w ill not inflate
when it sho uld.
A WARNING
If the front airbag infla tes, a ch ild witho ut
a c hild restraint , or in a rearwar d-fac ing
child safety seat , or in a forward-facing
child rest raint that has not been properly
installed will be serio usly injured and can
be killed.
-
A irbag system 16 1
-Even tho ugh you r vehicle is equipped
with an Advanced A irbag System, make
certa in that all children, espec ia lly 12
yea rs and younger, always ride on the
back seat prope rly rest rained for their
age and size .
- Always install forward o r rear-facing
child seats on the rear seat -even with
an Advan ced A irbag System.
- I f you must install a rearwa rd-facing
child seat on the front passenger seat because of ex ceptio nal circumstances
an d the
PASSENGER AIR BAG OFF light
does not appear and s tay on, immedi ate­
ly install the rear -facing child seat in a
rea r seating pos ition and have the airbag
system inspected by you r Audi dealer.
- If, in exceptiona l circumstances, you
m ust install a forwar d-fac ing ch ild re­
straint on the front passenger seat, al­
ways move the seat into its rearmost po­
sition in the seat's fore and aft adjust­
ment range, as fa r away from the a irbag
as poss ible. The backrest must be ad just­
ed to an upright pos ition. Make su re that
the
PASSENGER AIR BAG OFF light
comes on a nd stays on all the time when­
eve r the ignit ion is switched on .
A WARNING
=
- If the PASSENGER AIR BAG OFF light
does not go o ut when an a dult is sitting
on the front passenger seat after taking
the steps described above, make sure the
adu lt is properly seated and restra ined at
one of the rea r seat ing pos itions .
- Have the airbag system inspected by
your Aud i dea ler before transporting
anyone on the front passenger seat .
(D Tips
If the capacitive passenger detection sys ­
tem dete rm ines that the front passenger
seat is empty, t he fronta l airbag on the
passenger side will be turned off, and the
PASSENGER AIR BAG OFF light will stay
on.
•
•
•

164 Airbag system
Remember too, airbags will deploy only once
and on ly in certain k inds of accidents -your
safety belts are always there to offer protec­
tion in those accidents in which airbags are
not supposed to deploy or when they have al­
ready deployed, for example when your veh i­
cle strikes or is struck by another after the
first coll is ion .
This is just one of the reasons why an airbag is
not a substitute for the safety belt . The airbag
system works most effectively when used with
the safety belts . Therefore, always wear your
safety be lts correctly .
It is important to remember that while the
supplemental knee airbag system is designed
to reduce the likelihood of serious injuries,
other injuries , for example , swell ing, bruising
and minor abrasions and friction burns can al­
so occur when an airbag inflates.
The knee airbag system basically consists
of:
- The elec tronic con trol module
- T wo inflatab le airbags (airbag and gas gen-
erator), one fo r the driver and one for the
front passenger
- T he airbag indicator light in the instrument
panel
The knee airbag system will not deploy:
-when the ign ition is switched off
- in frontal collisions when the deceleration
measured by the control unit is too low
- in side collisions
- in rear-end collisions
- in rollovers
- i n the event of a system malfunction (warn-
i ng/indicator light is on)
Q page 20.
.8, WARNING
-Safety belts and the airbag system can
only provide protection when occupants
are in the proper seating posit ion
Q page 156.
-If the airbag indicator light¢ page 20
tur ns on when the vehicle is being used,
have the system inspected immediately
-
by your authorized Audi dealer. It is pos­
sible that the airbag will inflate when it
is not supposed to, or will not inflate
when it should .
How knee airbags work
Applies to vehicles: wi th knee airbags
The risk of injury to the leg area can be re ­
duced by fully inflated knee airbags.
Fig . 145 Inflated a irbags protecting in a fronta l co lli­
sion
The knee airbag system has been designed so
that the airbags for the driver and front pas ­
senger deploy in certa in but not all frontal
collisions.
If the front airbags dep loy, the knee airbags
also dep loy in frontal collisions when the de­
ployment threshold stored in the control unit
is met.
When the system deploys, the airbags fill
with a compressed propellant gas, and inf late
between the lower part of the instrument
panel and the driver and the lower part of the
instrument panel and the front passenger
Qpage 156, fig. 142.
Although they are not a soft pillow, they can
"cushion" the impact and in th is way they can
help to reduce the risk of injury to the lower
extremit ies .
All of th is takes place in the blink of an eye, so
fast that many people don't even realize that
the a irbags have deployed . The airbags also
i nflate with a great deal of force and it is im­
portant for occupant safety that nothing
shou ld be in their way when they deploy. ..,.

166 Airbag sys te m
not seated p roperly. The side airbag for the
front passenger seat can be used with proper­ l y installed ch ild restraints. Please be sure to
read the important information and warnings
whenever us ing a child restraint in a vehicle:
Safety belts¢
page 138, Airbag system
c:;, page 146, Child safety c:;, page 169.
The side airb ag system basically con sists of:
- the e lectronic control module and external
side impact sensors
- the two airbags located in the sides of the
front backrests
- the a irbag warn ing light in the inst rument
cluster .
The airbag system is monitored elect ron ica lly
to make certain that it is functioning prope rly
at all times. Each time you switch on the igni­
tion, the ai rbag system indicato r light will
come on for a few seconds (self diagnostics).
The s ide airbag system supp lements the safe­
ty belts and can help to reduce the risk of in­
jury to the driver's and front passenger's up­
per torso on the side of the vehicle that is
struck in a side co llision . The airbag deploys
only in s ide 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 tr iggered, even
though the ca r may be badly damaged as a re­
sult of the collision.
It is not possible to de­
f ine an a irbag tr igger ing range that will cover
every possible angle o f impact, since the cir­
cumstances wi ll vary conside rably between
one co llision and another. Important factors
include, for example, the nature (hard or soft)
of the impacting object, the angle of impact ,
ve hicle speed, etc. ¢
page 167, Important
safety instructions on the side airbag system .
Aside from their normal safety function, safe­
ty belts work to he lp keep the driver or front
passenger in position i n the event of a side
coll is io n so that the side a irbags can provide
protection .
The airbag system is
not a substitute for your
safety belt . Rather, it is part of the overall oc -cu pant restraint system in you
r vehicle . A l­
ways remember that the side 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 re ­
quires you to do so c:;,
page 138, General
notes.
It i s important to remember that w hile the
supplementa l side airbag system is designed
to reduce the likelihood of ser ious inju ries,
other injur ies, for example, swelling, bru is ing,
friction burns and m ino r abrasions can a lso be
associated w it h dep loyed side airbags. Re­
member too, side a irbags w ill dep loy on ly
once and on ly in certain kinds of accidents -
your safety belts are always the re to offer pro­
tection .
Vehicle damage, repair costs or even the lack
of ve hicle damage are not necessarily an indi ­
cation of over-sensitive or failed airbag activa­
t ion. In some col lisions, both front and side
airbags may inflate. Remember too, that air­
bags will deploy only once and only in certain
k inds of col lisions -your safety belts are al­
ways the re to offer p rotection in those acc i­
dents in which airbags are not supposed to
deploy or when they have a lready deployed .
The side airbag system will not deploy:
-when the ignit ion is switched off
- in side co llisions when the acceleration
measured by t he sensor is too low
- in front-end collisions
- in rear-end co llisions
- in rollove rs .
In some types of accidents the front airbags,
s ide cu rtain airbags and s ide a irbags may be
t rigge red togethe r.
_&. WARNING ~ ~
- Safety belts and the airbag system will
only provide protection when occupa nts
are in the proper seating position
c;, page 167 .

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-If the airbag indicator light c::> page 20
turns on when the vehicle is being used,
have the system inspected immediately
by your authorized Aud i dea le r. It is pos­
sible that the a irbag will inflate when it
is not s upposed to, or w ill not inflate
when it sho uld.
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 . 14 7 Side impac t pro tectio n: inflated s ide a irbag
When the system is triggered, the airbag is
fi lled with propel lant gas and brea ks thro ugh
a seam in the seat surface area marked "AIR­
BAG".
It expands between the side trim panel
and the passenger. In order to help provide
this additional protection, the side a irbag
must inf late within a fraction of a second at
ve ry high speed a nd with great force . The sup­
p lemental side a irbag could i njure you if your
seating position is no t proper or upr igh t or if
items are located in the area where the sup­
p lemental side a irbag expands. This app lies
espec ia lly to children
c::> page 169, Child Safe­
ty.
Supplementa l side airbags inflate between
the occupant and the door panel on the side
of the vehicle that is struck in certain side col­ lision
c::> fig . 147 .
Although they are not a soft pillow, they can
"cushion" the impact and in th is 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 de­ p loys. Th is is norma l and does not mean there
is a fire in the ve hicle.
A irba g sy stem 16 7
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.
T he re is a lot that yo u and your passengers
must know a nd act accord ingly to help the
safe ty belts and airbags do their job to pro­
v ide s upplemental pro tect ion .
A WARNING
An inflating side ai rbag can cause serio us
or fata l injury. Improperly wearing safety
belts and improper seat ing positions in­
crease the risk of serious personal injury
and death whenever a vehicle is bei ng
used .
- In order to reduce the risk of injury when
the supplemental side airbag inflates:
- Always sit in an upright position and
never lean aga inst the area where the
supplementa l side airbag is located .
- Never let a child or anyo ne e lse res t
their head aga inst the s ide trim pane l
in the area where the supplementa l
s ide airbag inflates.
- A lways make sure that safety be lts are
worn correctly,
- Do no t let anyone s itting in the front
seat put the ir hand or any ot her parts
of their body out of the window.
-Always ma ke s ure that the side a irbag
can inflate without interfe rence.
- Neve r install seat covers or rep lace­
ment upholste ry over the front seat­
bac ks that have not be en specifically
approved by Audi.
- Neve r use addi tional seat c ush ions that
cover the areas where t he s ide a irbags
deploy.
- Damage to the orig inal seat cove rs or
t o the seam in the area of the side a ir­
bag module mus t always be repaired
i mmedi ately by an author ized Audi
dealer.