2011 AUDI A5 COUPE sensor

situations. Be sure to read the important information about safety
and heed the WARNINGS in this chapter.
Deployment of the Advanced A irbag System and the activation of the
safety belt pretensioners depend on the deceleration measured by
the crash sensors and registered by the electron ic control unit. T he
amount of inflation of the front airbags can a lso be adapted to the
front seat position, depending on the distance between the respec­
tive front seat and the steering wheel or instrument panel as regis­
tered by sensors in the seats. Crash severity depends on speed and
deceleration as well as the mass and stiffness of the vehicle or object
involved in the crash .
On the passenger side, regardless of safety belt use, the air bag w ill
be turned off if the weight on the passenger seat is less than the
amount programm ed in the electronic control unit . The front airbag
on the passenger side will also be turned off if one of the chi ld safety
seats that has been certified under Federal Motor Vehicle Safety
Standard 208 has been recognized on the seat. The
PASSENGER AIR
BAG OFF
light comes on and stays on to tell you when the front
Advanced Airbag on the passenger side has been turned off
=> page 192, "Child rest raints on the front seat -some important
things to know".
& 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 190. •
Safety first Vehicle OP-eration
Airbag system
More important things to know about front
airbags
Fig. 17 9 Inflated
front airbags
Safety belts are important to help keep front seat occupants in the
proper seated position so that airbags can unfold properly and
prov ide supplemental protection in a frontal collision.
Th e front airbags are designed to provide additiona l protection for
the chest and face of the driver and the front seat passenger when:
• safety belts are worn properly,
• the seats have been positioned so that the occupant is properly
seated as far as possible from the airbag ,
• and the head restraints have been properly adjusted .
Because airbags inflate in the blink of an eye with great force, things
you have on your lap o r have placed on the seat could become
dangerous projectiles, and be pushed into you if the airbag inflates.
When an airbag deploys, fine dust is released. This is normal and is
not caused by a fire in the vehicle. This dust is made up mostly of a
powder used to lubricate the airbags as they deploy .
It could irritate
skin.
It is important to remember that while the supplemental airbag
system is desig ned to reduce the likelihood of serious injur ies, other
injuries, for example swell ing, bruising and m inor abrasions, can also
happen when airbags inflate. Airbags do not protect the arms or the •
Vehicle care Do-it-yourselt service iTechnical data

_,___A_ i_rb _ a_,g=-- s_, y:;.. s_ t_e _m ________________________________________________ _
PASSENGER AIRBAG OFF light
Fig. 180 Sec tion from
the in strume nt panel :
PASSENGER AIRBAG
OFF light
The PASSENGER AIRBAG OFF light is located in the center of the
ins trumen t panel => fig. 180 .
T he
PASSENGER AIRBAG OFF light w ill come o n and stay on to tell
you when the front Advanced Airbag on the passenger side has been
t u rn ed off by the ele ct ronic contro l unit. Each t ime you t urn on t he
ignition, the
PASSENGER AIRBAG OFF light w ill flash for a few
se conds and:
• will stay on if the front passenger seat is not occupied,
• will s tay on if t here is a small ch ild or child res trai nt on the fron t
passenger seat,
• will go out if t he front passenger seat is oc cupied by a n ad ult as
registered by the weight-sensing mat.
Th e
PASSENGER AIRBAG OFF light must come on and stay on if the
ignition is o n and
• a car bed has been installed o n the front seat, or
• a rearward-facing child restraint has been insta lled on the front
passenger seat, o r
• a forward-fac ing chi ld restraint has bee n installed on the front
passenge r seat, o r
• the weight registered on t he front passenger seat is equal to o r
less th a n the com bined we ight of a typic a l 1 year-o ld rest rained in one of the rear-faci
ng or forward-facing infant restraints listed in
F e d era l Mo tor Ve hicle Safe ty St and ar d 2 08 w ith which th e Adv anced
Airbag System in your vehicle was cert ified.
If the front passenger seat is not occupied, the front airbag will not
dep loy, and t he
PASSENGER AIRBAG OFF ligh t will s tay o n. N ever
install a rearward -facing child restraint on the f ront passenger seat,
t he s afest pla ce fo r a child in any k ind of child rest rain t is a t one o f th e
seating pos it ions on the rear seat::::;,
page 192, "Child restraints on
t he fro nt sea t- some im port an t things to kno w" and =>
page 215,
"Ch ild Safety".
If the PASSENGER AIRBAG OFF light comes on when one of the
c onditions lis ted above is met, be sure to check the lig ht reg ularly to
ma ke certain that the
PASSENGER AIRBAG OFF light stays on conti n­
uously w henever the ignition is o n. If the
PASSENGER AIRBAG OFF
light does not appear and not stay on a ll the time, stop as soon as it
is safe to do so and
• reactivate the system by turn ing the ig nition off and then turn ing
it on again;
• remove and reinstall the child restraint. Make sure that the c hild
restrain t is properly insta lled and that the sa fety belt for the fron t
passenger seat has been correctly ro uted around the child restraint as
described in the child res trai nt ma nufactu rer's instr uctions;
• make sure that the convertible lock ing feature on t he safety belt
f or the front passenger sea t has been act ivate d an d that the safe ty
belt has bee n pulled tight. The belt m ust not be loose or have loops
of slac k so that t he senso r be low the safety belt latc h on the seat can
do its job::::;,
page 225.
• make s ure tha t things that may in crease the weight o f the chi ld
and child safety seat are not be ing transported on t he front
passenge r seat;
• make sure that the safety belt tension sensor is not blocked.
Shake the safety belt la tch on the front passenger seat back and
forth;
• If a st rap o r te ther i s be ing u sed t o tie the c hild safety sea t to the
front passenger seat, make sure that it is not so tig ht that it causes .,_

______________________________________________ ___:.A:::::.:.: ir:....: b~ a~g !....= s:ly '..:s~ t~ e~ m~ ---
& WARNING (co ntinued )
• Always make sure that the side airbag can inflate without
interference:
-Never install se at covers or replacement upholstery over the
front seatbacks 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 original seat covers or to the seam in the area
of the side airbag module must always be repaired immedi­
ately by an authorized Audi dealer.
• The airbag sy stem can be activated only once. After an airbag
has inflated, it must be replaced by an authorized Audi dealer or
qualified technician who has the technical information , training
and special equipment necessary.
• The airbag sy st e m can be deployed only onc e. After an airbag
has been deployed, it must be replaced w ith new replacement
parts de signed and approved es pecially for your Audi model
version . Replacement of complete airbag systems or airbag
components must be performed by qualified workshops only.
Make sure that any airbag service action is entered in your Audi
Warranty
& Maintenance booklet under AIRBAG REPLACEMENT
RECORD.
• In accidents when an airbag is deployed, the vehicle battery
separates the alternator and the starter from the vehicle electrical
system for safety reason s with a pyrotechnic circuit interrupter.
- Work on the pyrotechnic circu it interrupter must only be
performed by a qualified dealer -risk of an a ccident!
- If the vehicle or the circu it interrupter is scrapped, all appli­
cable safety precautions must be followed .
Controls and equip­ ment Safety first Vehicle operation
'£' For the sake of the environment
U
ndeployed airbag modules and pretens io ners mig ht be classified as
Perch lorate Material -special handling may app ly, see
www.d ts c. ca.gov/ha za rdouswaste/pe rchlorate . W he n t he vehicle or
parts of the restraint system includi ng a irbag modules safety belts
w ith pretens io ners are s crappe d, all ap plic abl e laws and reg ulat ion s
must be observed. Your author ized Aud i dealer is familiar with these
req uir ements and we recommen d that yo u have yo ur dea le r pe rform
this service for you .•
Other things that can affect Advanced
Airbag performance
Chang ing the ve hicle's suspension system can change the way that
t he Adv anced Airbag System pe rforms in a crash . For example, using
tire-r im combinations not approved by Aud i, lower ing the veh icle,
c hang ing the st iffness o f the suspe nsio n, incl uding the s prings,
s u spension str uts, shoc k absorbe rs etc. can change the forces that
are meas ured by the airb ag sensors and sen t to the ele ctron ic con trol
uni t. Some suspension changes ca n, for examp le, increase the force
levels measu red by t he sensors and ma ke the airbag system dep loy in
crashes in which it wou ld not deploy if the changes had not bee n
made . Other kin ds of changes may re duce the force levels meas ured
by the senso rs and p revent the airbag from dep loyi ng when it should .
The sensors in the safety belt buckle for the d river and front
p assenger se at tell the e le ct ro nic co ntro l mo dule if the sa fe ty belt is
latc hed or not . If the safety be lt is be ing used, the fron t airbag w ill
dep loy at a s ligh tly hig her ra te o f ve hicl e decelerat io n t han if the
safety belt is not be ing used. T he refo re, in a part icular collis io n, it is
poss ible that an a irbag wi ll not deploy at a seating posit ion where the
safety belt is being used but wi ll inflate at the posi tion whe re the
safety belt is not bei ng used. It is important that not hing interfere
w ith the s afe ty be lt bu ckles so t hat th e sensor s can sen d the correct
information about safety belt use to the electronic contro l unit. ..
Vehicle care Do-it-yourself service Technical data

..,. Airbag system
PAWi-- --=------------------------------
& WARNING
Changing th e vehicle 's su sp en sion including use of unappro ved
tire -rim c ombination s can change Advan ced Airbag performan ce
and increas e the risk of serious personal injury in a cra sh .
• Never install suspension component s that do not have the
same performance characteristics as the components or iginally
installed on your veh icle.
• Never u se tir e-rim combinations that have not been approved
b y Audi.
& WARNING
Item s stored b etween the safety belt buckl e and the center
console can cause the sensors in the buckle to send the wrong
information to the ele ctroni c control module and prevent the
Advanced Airbag System from w orking properl y.
• Always make sure that nothing can interfere with the safety
belt buckles and that they a re not obstru cted .
<£> For the sake of the environment
Undeployed airbag modu les and pretensioners might be class ified as
Perch lorate Mate rial -special handling may app ly, see
www.dtsc.ca.gov/hazardouswaste/pe rchlorate . When the vehicle or
p arts of t he rest raint sys tem including a irbag mod ules safe ty belts
w ith pretens ioners are scrapped, all applicable laws and regulat ions
must be observed. Your authorized Audi dealer is familiar with these
requ irements and we recommend that you have your dealer perform
this se rvice for yo u.•
Knee airbags
Applies to veh icles: w ith knee a irbags
Description of knee airbags
The airbag system can provide supplemental protection
to properly restrained front seat occupants.
....
! 00 m
Fig. 181 D riv er's kn ee
a ir ba g
The knee airbag for the driver is located in the instrume nt panel
unde rneath the steering whee l:::> fig. 181, the knee airbag for the
passenge r is at about the same he ight in the instrument panel u nder­
neath the g love compartment .
Th e knee airbag offers addit ional protec tion to the dr ive r's and
passenger's knees and upper and lower thigh areas as a supplement
t o the sa fety bel ts.
If the front a irbags dep loy, the knee airbags a lso deploy i n frontal
co llisions above a certain severity=>
page 199, "More importan t
things to know about front airbags" .
Besides the ir normal safety function, safety be lts work to help keep
t he drive r o r front passenger in po sit ion in c ase o f a frontal collision
so that the a irbags can provide protection .
Th e airbag system is not a substitute for your safety belt . Rather, it is
part of the overall occ upant restra int system in your veh icle . Always
remember t hat the airbag system can on ly help to protect you if you
~

Side airbags
Description of side airbags
The airbag system can provide supplemental protection
to properly restrained occupants.
Fig. 183 Side airbag
location in the driver's
seat
The side airbags are located in the sides of the front seat backrests
=>
page 209, fig. 183. They are identified by the word "AIRBAG" .
The side airbag system basically consists of:
• the electronic control module and external side impact sensors
• the two side airbags located in the sides of the front backrests
• the airbag warning light in the instrument cluster.
The airbag system is monitored electronically to make certain that it
is functioning properly at all times. Each time you turn on the igni­
tion, the airbag system indicator light will come on for a few seconds
(self diagnostics) .
The side airbag system supplements the safety belts and can help to reduce the risk of injury to the driver's and front 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 only when the vehicle acceler­
ation registered by the control unit is high enough . If this rate is
below the reference value programmed into the control unit, the side
airbags will not be triggered, even though the car may be badly
Safety first Vehicle OP-eration
Airbag system
damaged as a result of the collision. It is not possible to define an
airbag triggering range that will cover every possible angle of impact,
since the circumstances will vary considerably between one collision
and another. Important factors include, for example, the nature
(hard or soft) of the impacting object, the angle of impact, vehicle
speed, etc.
=> page 210, "Important safety instructions on the side
airbag system" .
Aside from their normal safety function, safety belts work to help keep the driver or front passenger in position in the event of a side
collision so that the side airbags can provide protection.
The airbag system is
not a substitute for your safety belt. Rather, it is
part of the overall occupant restraint system in your vehicle. Always
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 requires you to do so=>
page 181, "General notes".
It is important to remember that while the supplemental side airbag
system is designed to reduce the likelihood of serious injuries, other
injuries, for example, swelling, bruising, and minor abrasions can
also be associated with deployed side airbags. Remember too, side
airbags will deploy 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 vehicle damage are
not necessarily an indication of over-sensitive or failed airbag activa­
tion. In some collisions, both front and side airbags may inflate.
Remember too, that airbags will deploy only once and only in certain
kinds of collisions -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 already deployed.
The side airbag system will not deploy:
• when the ignition is turned off
• in side collisions when the acceleration measured by the sensor is
too low
• in front-end collisions
~
Vehicle care Do-it-yourselt service iTechnical data

______________________________________________ ___::A....:..:..: i r:...: b=.= a:.;g ~ s~y :.:s:.: t:.: e:.: m~ ---
& WARNING (continued)
-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 replacement upholstery over the front seat backs that have not been specifically approved by
Audi.
- Never use additional seat cushions that cover the areas
where the side airbags deploy.
- Damage to the original seat covers or to the seam in the area
of the side airbag module must always be repaired immedi­
ately by an authorized Audi dealer.
• Objects between you and the airbag can increase the risk of
injury in an accident by interfering with the way the airbag unfolds
or by being pushed into you as the airbag inflates. -Never place or attach accessories or other objects (such as
cupholders, telephone brackets, or even large, bulky objects)
on the doors, over or near the area marked "AIRBAG" on the
seat backrests.
- Such objects and accessories can become dangerous projec­
tiles and cause injury when the supplemental side airbag deploys.
- 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
Controls and equip­ ment Safety first Vehicle operation
& WARNING
(continued)
pockets that may interfere with side airbag deployment and can
cause personal injury in an accident.
• Always prevent the side airbags from being damaged by heavy
objects knocking against or hitting the sides of the seatbacks.
• The airbag system can only be triggered once. If the airbag has
been triggered, the system must be replaced by an authorized
Audi dealership.
• Damage (cracks, deep scratches etc.) to the original seat covers
or to the seam in the area of the side airbag module must always
be repaired immediately by an authorized Audi dealer.
• If children are seated improperly, their risk of injury increases
in the case of an accident=>
page 215, "Child Safety".
• Never attempt to modify any components of the airbag system
in any way.
• In a side collision, side airbags will not function properly if
sensors cannot correctly measure increasing air pressure inside
the doors when air escapes through larger, unclosed openings in
the door panel.
- Never drive with interior door trim panels removed.
-Never drive when parts have been removed from the inside
door panel and the openings they leave have not been properly
closed.
- Never drive when loudspeakers in the doors have been removed unless the speaker holes have been properly closed.
- Always make certain that openings are covered or filled if
additional speakers or other equipment is installed in the
inside door panels.
- Always have work on the doors done by an authorized Audi
dealer or qualified workshop. •
Vehicle care Do-it-yourself service Technical data

-Airbag system -
--=---=----------------
Side curtain airbags
Description of side curtain airbags
The side curtain airbag system can provide supplemental
protection to properly restrained occupants .
Fig . 18 5 Side c urta in
sys tem, drive r's side:
s ide cu rtain ai rba g
loc atio n
The side curtain airbags are located on both sides of the interio r
above the front and rear side windows=> fig. 185. They are identified
by t he word "AIRBAG" on the w indshield frame and t he center roof
pillar.
T he side curta in airbag system s upplements t he safety belts and can
help to reduce the risk of inju ry for occupa nts' heads a nd upper torso
on t he side of the vehicle th at is struck i n a sid e collision . The s ide
cu rtain airbag inflates i n side im pacts and o nly when the vehicle
acceleration reg istered by the contro l unit is high enoug h. If this rate
is below the reference va lue programmed into the cont rol unit, the
side airbags wi ll not be triggere d, even though t he car may be bad ly
damaged as a resul t of the co llis ion .
It is not possib le to define an
airbag triggering range that w ill cover every possible angle of impact,
s in ce the circumstance s will vary conside rably between one colli sion
and another. Important factors include, for example, the nature
(h ard o r soft) of t he impa cti ng obje ct, t he a ngle of impa ct, vehicle
speed, etc.=>
page 213, "H ow side curta in airbags work" . Aside from the
ir normal safety fu nction, safety belts work to he lp
keep the driver or fron t passen ger in posit io n in t he even t of a co lli­
sion so that the s ide cu rta in a irbags can provide protection .
T he airbag system is not a substitute for your safety belt . Rathe r, it is
pa rt of the ove rall oc cupant rest ra int system in your veh icle. Alway s
remember that the airbag system can on ly help to protect you if yo u
a re wear ing you r safety be lt and we aring it p ro perly. Thi s is anothe r
reason why you s hou ld always wear your safety be lts, not just because
t he law requi res you to do so=>
page 181, "Gene ral no tes" .
It is important to remember that while the s ide curta in airbag system
is designed to he lp reduce the like lihood of ser io us injur ies, other
in ju ries, fo r example, swe lling, br uis ing, and minor abras ions can
also be assoc iate d with these airbags. Remember too, these a irbags
w ill deploy on ly on ce a nd on ly in ce rtain kinds of acci den ts -yo ur
safety belts are always there to offer p rotect ion .
The side curtain airbag system basically consists of:
• T he electron ic control mo dule and e xternal side impact sensors
• The sid e curtain airbags above the front and rea r side windows
• Th e air bag indic ator ligh t in the ins tru men t panel
T he a irbag system is mo nitored e lectro nica lly to make certain it is
functioning prope rly at a ll times . Each time you turn on t he ignitio n,
t he a irbag system indica to r light w ill come on for a few secon ds (self
diagnostics) .
The side curtain airbag is not activated:
• if the ignition is turned of f,
• in side co llisions when the accelerat io n measured by the sensor is
t oo low,
• in rear-end co llisions ,
• in rollovers. _,.

_________________________________________ _:C~ h~il ~d ~ S~a ..!.:fe =. t SYL _lffll
and for the different models of the same kind of child restraint
offered by child restraint manufacturers.
The weight ranges for the individual types, makes and models of ch ild
restraints that the NHTSA has specified in the Safety Standard
together with the weight ranges of typical infants and typical 1 year­
old child have been stored in the control unit of the Advanced Airbag
System. When a child restraint is being used on the front passenger
seat with a typical 1 year-old chi ld, the Advanced Airbag System
compares the weight meas ured by the weight sensing mat with the
information stored in the electronic control unit .
The electronic contro l unit a lso registers the tension on the front
passenger safety belt. The tension on the safety belt for the front
passenger seat will be different for an adult who is properly using the
safety belt as compared to the tension on the belt when it is used to
attach a child restraint to the seat . The sensor below the latch for the
safety belt for the front seat passenger measures the tension on the
belt. The input from this sensor is then used with the weight to
"decide", whether there is a child restraint with a typical 1 year-old
child on the front passenger seat and whether or not the airbag must
be turned off .•
Child restraints and Advanced Airbags
Regardless of the child restraint that you use, ma ke sure that it has
been certified to meet United States Federal Motor Vehicle Safety
Standards and has been ce rtified by its manufacturer for use with an
airbag . Always be sure that the child restraint is properly installed at
one of the rear seating positions. If in exceptional circumstances you
must use it on the front passenger seat, carefully read all of the infor­
mation on ch ild safety and Advanced Airbags and heed all of the
app licab le WARNINGS. Make certain that the child restra int is
correctly recognized by the weight-sensing mat inside the front
passenger seat, that the front passenger airbag is turned off and that
the airbag status is always correctly signaled by the
PASSENGER AIR
BAG OFF
light.
Controls and equip­ ment Safety first Vehicle operation
Many types and models of child restra
ints have been available over
t he years, new models are introduced reg ularly incorpo rating new
and improved designs and older models are taken out of product ion.
Chi ld restraints are not standardized. Child restraints of the same
type typ ically have d ifferent weights and sizes and differe nt 'foot­
prints,' the size and shape of the bottom of the child restraint that
sits on the seat, when they are installed on a vehicle seat . These
differences make it virtually impossib le to certify compliance with
t he requirements for advanced airbags with each and every chil d
restra int that has ever been sold in the past or will be sold over the
course of the useful life of your vehicle.
For this reason, the United States Nationa l Highway Traffic Safety
Administration has published a list of specific type, makes and
mode ls of child restra ints that must be used to cert ify compliance of
the Advanced Airbag System in yo ur vehicle with the suppression
requirements of Federal Motor Veh icle Safety Standard 208. These
child restraints are:
Subpart A - Car bed child restraints
Model
Angel Gua rd Angel Ride
AA2403 FOF
Manufactured on or
after
September 25, 2007
Subpart B -Rear-facing child restraints
Model
Century SmartF it 4543
Cosco Ar riva 22-013PAW and
base 22-999 WHO
Evenflo D iscovery Ad just Right
21 2
Evenflo First Cho ice 204
Manufactured on or
after
December 1, 1999
September 25, 20 07
December 1, 1999
December 1, 1999
Vehicle care Do-it-yourself service Technical data