sensor AUDI A6 2011 Service Manual

& WARNING
Changing the vehicle's susp ension including use of unapproved
tire -rim combination s can change Advan ced Airbag performance
and increase the risk of serious personal injury in a crash .
• Never install suspension component s that do not have the
same performance characteristics as the components originally
installed on your vehicle.
• Ne ver use tire-rim combinations that have not been approved
by Audi.
& WARNING
Items stored between the safety belt buckle and the center
console can cause the sensors in the buckle to send the wrong
information to the electronic control module and prevent the
Advanced Airbag System from working properly.
• Always make sure that nothing can interfere with the safety
belt buckles and that they a re not obstructed .
<£> For the sake of the environment
Undeployed airbag modu les and pretensioners might be class ified as
P erch lorate Materi al - sp eci al ha ndl ing m ay a pply, see
www.dtsc.ca.gov/hazardouswaste/perchlorate. When the vehicle or
parts of t he re st ra int s ystem includ in g air bag modu les and safe ty
belts with pretensioners are scrapped, all applicable laws and regula­
tions m ust be o bserve d. Your authorized Audi dea le r is familiar with
t hese requirements and we recommend that you have yo ur dealer
per form th is service for you. •
Safety first Vehicle OP-eration
Airbag system
Side airbags
Description of side airbags
The airb ag sys tem can pro vide su pplemen ta l pro tection
t o pr operly restr ained occ upants .
Fig. 18 5 S ide air bag
loca tion in the d river's
seat
T he side airbags are located in t he sides of t he front seat backrests
~ fig. 185 and the rear backrest * facing the doors. They are ide nti ­
fie d by th e word "AIRBAG" .
The side airbag system basically consists of :
• the ele ctron ic cont rol mod ule and extern al side imp act se nsors
• the two side airbags located in t he sides of the front backrests
• two rear side airbags (as an o rde red
o p tion)
• the airbag wa rni ng light in the instr ument cluster .
Th e air bag sys tem is monitore d ele ct ronically to m ake ce rtain that it
is funct io ning properly at all times. Each t ime you turn on the igni­
tion , the airb ag system indica tor light w ill come on fo r a few seconds
(self d iagnostics).
Th e side airbag sy stem sup plements the safety belts and can he lp to
re du ce the risk of inju ry to the dr ive r's, fron t and rear* passenger 's
upper torso on the side of the ve hicle that is struck in a side coll is ion.
The airbag d eploys o nly in s ide impac ts an d only when the ve hicl e
acce leration reg istered by the contro l un it is high enough. If this rate
~
Vehicle care Do-it-yourselt service iTechnical data

-Airbag system PIS!- --=--=----------------
is below the reference va lue programmed into the cont rol unit, the
side airba gs w ill no t be triggered, even though t he car may be b ad ly
damaged as a result of the collision. It is not possible to define an
airbag tr iggering range that w ill 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 215, "Important safety instructions on the side
airbag system" .
Aside from the ir normal safety function, safety be lts work to help
keep the d river or front passenger in posit ion in the event of a side
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 ove rall occupant restraint system in your veh icle. Always
remember that the side airbag system can only help to protect you if
you a re wearing your safety belt and wearing it p rope rly. This is
another reason why you shou ld always wear your safety belts, not just
because the law requires you to do so~
page 187, "General no tes" .
It is important to remembe r that wh ile the supp lemental s ide airbag
system is designed to reduce the likelihood of se rious injuries, ot her
injuries, fo r examp le, swe lling, bru ising, and minor abras ions can
also be associated with deployed side airbags . Remember too, side
airbags will dep loy only once and only in certai n kinds of accidents -
your safety belts are always there to offer protection.
Vehicle damage, repair costs or even the lack of veh icle damage a re
not necessar ily an ind ication of over-sensitive or failed airbag activa­
t ion . In some collisions, both front a nd side airbags may inflate .
Remember too, that a irbags will deploy only once and only in certa in
kinds of collisions -your safety belts are a lways there to offer protec­
tion in those acc idents in w hich airbags a re 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 collis ions
• in rea r-end collisions
• in rollovers .
In some types of accidents the front a irbags, side curtain airbags and
side airbags may be triggered together.
& WARNING
• Safet y belts and the airbag s ystem will only provide protection
when o ccupants are in the proper seating position ~
page 215.
• If the airbag indicator light comes on when the vehicle i s being
used, have th e system inspe cted immediately by your authoriz ed
Audi dealer. The airbag may not work prope rly when the vehicle
a cceleration in a side collision is high enough to activate the
ai rbag. •
How supplemental side airbags work
Side airbags deploy instantly and can help reduce the risk
of upper torso injuries for occupants who are pro perly
restrained.
Fig. 186 Inflated side
ai rba gs on left side of
v eh icle, rea r side
a irba g opti onal e quip ­
m ent
When the system is triggered, the airbag is filled wit h propellant gas
and breaks thro ugh a seam in the seat s urface area marked
~

Ill Airbag system
---=---=----------------
& WARNING (continued)
• 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 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 219, "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. •
Side curtain airbags
Description of side curtain airbags
The side curtain airbag system can provide supplemental
protection to properly restrained occupants.
Fig . 187 Side curtain
airbags , driver 's side:
locati on
The side curtain airbags are located on both sides of the interior
above the front and rear side windows =:> fig. 187 . They are identif ied
by the wo rd "AIRBAG" on the windshield frame and the cente r roof
pillar.
Th e side curtain airbag system supplements the safety belts and can
he lp to reduce the risk of injury for occupants' heads a nd upper torso
on the side of the vehicle th at is struck in a si de collis ion. The side
curtain airbag inflates in side impacts and only when t he veh icle
acceleration registered by the control u nit is high enoug h.
If this rate
is below the reference va lue programmed in to the control unit, the
side airbags wi ll not be triggered, even though the car may be badly
damaged as a result of the collision. It is not possible to define an
airbag triggering range that wi ll cover every possible angle of impact,
since the circumstances will vary consid erably between one collision
and another. Important factors include, for example, the nature
(h ard or soft) of the impacting object, the angle of impact, vehicle
speed, etc.=:>
page 217, "H ow s ide curta in a irbags wor k". .,_

Aside from their norma l safety function, safety be lts work to he lp
kee p th e dr iver or fron t p asse n ger in posi tion in t he even t of a c olli­
sion so that the side cu rtain a irbags can provide protection.
T he a irbag system is not a substitute for your safety belt . Rathe r, it is
par t of the ove rall o ccu pan t res traint syste m in your vehicle . A lw ay s
remember t hat the airba g system can on ly help to protect you if you
a re we ari ng your safety bel t and wearing it prop erly. Thi s is ano ther
reaso n why you s hou ld always wea r your safety be lts, not just because
th e law requi re s you to do so=>
page 187 , "G ene ral not es".
It is i mpo rtant to re m ember that while the s ide curta in airbag system
is des igned to help re duce the likelih ood of serious injuries, ot her
i n jur ies, fo r exa mple, sw elling, br uising, a nd m inor ab rasions can
also be assoc iated wit h these airbags upo n dep loyment . Remembe r
t o o , these a irbags w ill d eploy only on ce an d on ly in ce rt ain kinds of
acc idents -yo ur safety belts are always there to offer protection.
The side curtain airbag system basically consists of:
• Th e electronic co ntro l mo dule an d external side impact sensors
• The side c urtai n airbags above the fro nt an d rea r side windows
• Th e airba g indic ator ligh t in the ins trumen t panel
Th e a irbag system is monitored elec tron ically to make certai n it i s
functioning prope rly at a ll times . Each time yo u turn on the ignition,
t h e airbag sys tem indicator ligh t w ill com e on for a few seconds (s elf
diagnostics) .
The side curtain airbag is not activated:
• if the ignition is turned off,
• in side co llisions when the accelerati on measured by the sens or is
t o o low,
• in rear-end collisions,
• in rollove rs.
Safety first Vehicle OP-eration
Airbag system
& WARNING
• Safety belts and the airbag system will only provide protection
when occupants are in the proper seating position =>
page 75,
"General recommendations ".
• If the airbag indicator light comes on when the vehicle is being
used, have the system inspected immediately by your authorized
Audi dealer. The side curtain airbag may not work properly even
when the vehicle acceleration in a side collision is high enough to activate the airbag.~
How side curtain airbags work
Side cu rtain ai rbags c an wo rk to gethe r w it h sid e airba gs
to h elp r ed uce the risk of h ead and upp er tors o inju rie s f or
o cc u pan ts who are pr operly restr ained.
Fig . 188 Illu str ation
of principle: Inflated
side curt ain airbag s on
the left side
Th e side curtain airbags in flate between the oc cupan t and t he
w indows on the side of the vehicle t hat is struck in a sid e co llision
=> fig. 188.
Wh en the sys tem is tr igg ered, the side curta in airbag is filled w ith
pro pell ant gas and breaks th rough a seam above the front and rear
s ide w indow s iden tifi ed b y the AIRBAG label. In or der to help pro vid e
this additional protection, the side c urta in airbag must inflate with in
th e bl ink of an eye at very hi gh speed and wi th gre at force. The side ._
Vehicle care Do-it-yourselt service iTechnical data

-----------------------------------------~C~ h~il ~d ~ S~a _!fe ~ t !;YL __
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:
A. Car beds, manufactured on or after September 1,
2004:
• Cosco Dream Ride 02-719
B. Rear facing child restraint systems,
manufactured on or after September 1, 2004:
(When the restraint system comes equipped with a removable base,
compliance has to be cert ified with or without the base) .
• Britax Handle with Care 191
• Century Assura 4553
• Century Smart Fit 4543
• Cosco Arriva 02727
• Evenflo Discovery Adjust Right 212
• Evenflo First Choice 204
• Graco Infant 8457
Vehicle care Do-it-yourself service Technical data

Intelligent technology
'-----------------------------------------------
Intelligent technology
Notice about data recorded by
vehicle control modules
Your vehicle is not equipped with an Event Data Recorder (EDR),
installed by some manufacturers for the express purpose of
capturing data for retrieva l after an accident or crash event. ED R's are
sometimes called "crash recorders".
Some state laws restrict the retrieval or downloading of data stored
by ED R's that were installed in a vehicle for the express purpose of
retrieving data after an accident or crash event without the owner's
consent.
Although your vehicle is not equipped with an EDR, it is equipped w ith
a number of electronic control modu les for various vehicle systems
such as, for example, engine function, emission control, as well as for
the airbags and safety belts.
T hese electronic contro l modules also record vehicle-re lated data
during normal vehicle operation for diagnostic and repair purposes .
Th e recording capacity of the e lectronic control modu les is limited to
data (no sound is recorded) and only a sma ll amount of data is actu­
ally recorded over a very limited period of time and stored when a
system fault or other condition is sensed by a control unit. Some of
the data then stored may relate to vehicle speed, direction, braking
as well as restraint system use and performance in the event of a
crash or other condition. Stored data can only be read and down­
loaded with special equipment.
Electronic Stabilization Program
(ESP)
General information
The ESP improves the vehicle stability.
l, I
Fig. 201 Center
console with ESP
switch
ESP is des igned to help you maintain vehicle control in s ituations
where the car approaches the limits of "grip", especia lly when accel­
erat ing and cornering. ESP reduces the risk of skidd ing and imp roves
stability under all road conditions.
Th e system operates across the entire speed range in combination
with the ABS system. If the Anti-Lock Brake System (ABS) malfunc­
tions, the ESP will also shut down.
How the system works
The Anti-Lock Brake System (ABS), Electronic Differential Lock (EDL)
and the Anti-Slip Regulation System (ASR) are integrated in the elec­
tronic stabilizatio n pro gram. In addition to the data provided by
these funct ions, the ESP control unit requires additional measure­
ment data provided by high performance sensors. The rotational
speed of the vehicle about its vertical axis, veh icle acceleration in the ...

Intelligent technology
--------------------------------------------------' '----'----
fore-and-aft and lateral directions, the brake pressure and the
steering angle are all measured.
The direction in which the driver wishes to travel is determined with
the aid of the steering angle and vehicle speed and is continually
compared with the actual behavior of the vehicle. If the two do not
match, for example , when the vehicle starts hydroplaning on a wet
road, ESP will automatically brake the appropriate wheel to correct
the problem.
The vehicle is then stabilized by the forces acting on the wheel during
braking. If the vehicle is
oversteering (rear tends to skid out of the
turn), the brakes are mainly applied on the wheel that is on the
outside of the curve. In the case of a vehicle that is
understeering
(tendency to slide out of the curve), the brakes are applied at the rear
wheel that is on the inside of the curve. An acoustic signal indicates
when ESP brake application cuts in =>
&.
The system operates across the entire speed range in combination
with the ABS system=>
page 246. If the Anti-Lock Brake System
(ABS) malfunctions, the ESP will be out of action as well.
Activating
When you turn on the engine, ESP will automatically be activated and
will perform a self-test . As soon as the test is completed, the system
is in normal operating mode.
You can activate a deactivated ESP or deactivated ESP/ ASR if required
by pressing the=>
page 242, fig. 201 button. When they are acti­
vated, the message
ESP/ASR on appears briefly in the display .
Deactivating
The ESP should normally be activated all the time. If necessary , you
can deactivate Anti-Slip Regulation (ASR) or the Electronic Stabiliza­
tion Program (ESP) by pressing the button =>
page 242, fig. 201.
• Deactivating ASR: Tap the but ton . In certain excep tional situa­
tions (e.g. driving with tire chains) , the Anti-Slip Regulation (ASR) can
be deactivated=>
page 244 . The message ASR off appears in the
display as well.
Controls and equip­ ment Safety first Vehicle operation •
Deactivating ESP/ASR
Press the button for more than 3 seconds .
With the ESP/ASR deactivated, the ESP check light comes on, see
=>
page 14. The message ESP switched off appears in the display as
well.
& WARNING
The Electronic Stabilization Program is nevertheless subject to the laws of physics. It is particularly important to pay attention to
this fact on wet and slippery roads. It is therefore important that
you always adapt your driving to the condition of the road and traffic conditions. Do not allow the increased safety provided by
the Electronic Stabilization Program system to lull you into
accepting additional safety risks. •
Electronic differential lock (EDL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
General notes
The electronic differential lock (EDL) helps the car to start moving,
accelerate and climb a gradient on surfaces providing poor or almost
no grip . Without EDL, this would be difficult, if not impossible .
How the system works
The EDL operates automatically . It monitors the rotational speed of
the drive wheels on an axle with the help of the ABS sensors
=>
page 246 . If a noticeable difference in rotational speed between
the drive wheels on one axle is detected (e.g. on slippery ground
on
one side),
the spinning wheel is braked, thereby transferring power to
the othe r drive wheel or wheels (all-wheel drive). This is done up to a
speed of about 60 mph (100 km/h) . Noises from the brake system
signal that wheel spin is being controlled.
Vehicle care Do-it-yourself service Technical data

Intelligent technology
'-----------------------------------------------
Driv ing off
When driving off, always be sure to keep road conditions in mind as
you acce lerate. If one d rive w heel spins because it is on a surface with
less grip, gradua lly inc rease the press ure on the accelerator pedal
un til the car sta rts to move .
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads o n this whee l, t he EDL cuts out tem po­
ra rily. The vehicle rema ins operat iona l a nd be haves in the same way
as a ve hicle wit hout EDL.
As soon as the bra ke has coo le d down , ED L swit ches on again au to­
matically.
& WARNING
• When accelerating on slippery surfaces , such as on i ce or snow ,
alway s be careful when depre ssing the accelerator pedal. Even
with the EDL work ing , the drive wheels can spin and reduce your
ability to control your car. Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety ri sks . Always adapt your driving style to the road
conditions and traffic situation.
(I) Tips
If a fa ult occurs i n the ABS, the EDL is also not f unct io ni ng . This is
indic ated by t he A BS war ning ligh t=>
page 17.
Anti-Slip Regulation System (ASR)
The Anti- S lip Re gula tio n Sy stem preven ts the dr iven
w heels from spin ning w hen t he car is accelerating .
General notes
The Anti-S lip Reg ulation Sys tem (AS R) is in tegr ate d in the ele ctroni c
stabilization program (ESP) . When the ve hicle starts up and acceler­
at es, the whee ls are p reven ted from sp inning by adjust ing t he engine
power to match the amount of grip avai lable from the road surface.
How the system works
ASR performs automatically, i.e. witho ut the driver 's intervent ion.
W ith the a id of t he ABS sensors=>
page 246, ASR moni to rs the speed
of the dr iven wheels. If the wheels start to spin , th e engine torque is
redu ced a utomatically unti l the t ires find enou gh gr ip to lock onto
the road surface. T he system is active across the entire speed range .
Th e ASR works in conjunction with the ABS. If a malfunction sho uld
occ ur in th e ABS, th e AS R w ill also be out of action.
Activating
The ESP is automatically activated whe n the engine is started and it
performs a se lf-test. You can act ivate a deact ivate d ASR if required by
press ing the=>
pag e 242, fig. 201 button. Whe n it is act ivated, t he
message
ESP/ASR on appears briefly in t he disp lay. Vehicles with
front-wheel d rive a dea ct iva te d ASR a uto mat icall y re-ac tiva tes i tself
at a speed of 40 mp h (70 km/h) .
Deactivating
You can deact ivate t he ASR if required by pressing t he button (for less
t han 3 se conds) =>
page 242, fig . 2 0 1. Wi th the ASR dea ct ivated, the
ESP check light comes on, see=>
page 14. The message ASR off
appe ars i n the di sp la y as wel l. On vehicles wi th fro nt-whee l dr ive:
deactivation is possible only up to 30 mph (SO km/h) for safety
reas ons. Vehi cles w ith all -wheel drive: the AS R can be deac tivated at
any speed. ..

-~_C_ le_ a_n_ i_ n_ g=- a_ n_d___. p_ ro_ t_e _c_ t_ i_o _n ___________________________________________ _
0 Note
• Never try to remove dirt, mud o r d ust if the s urface of the vehicle
is dry. Never use a dry cloth or sponge, s ince this could scratch your
veh icle's pai nt o r win dows.
• Never was h your car in bright sunlight . D rops of water act as
magnifyi ng lenses and may damage your p aint.
• When you was h yo ur car in the winter: if you rinse your vehicle w ith
a hose , be careful not to a im the stream of wate r d irect ly at locks, or
at doo r or hatch openings -they can freeze s hut.
• N ever use sponges des igned to remove insects, o r any kitchen
sco uring sponges or s imilar pro ducts. They can damage yo ur paint
fi ni sh.
• N ever use a dry cl oth o r sp on ge to clean t he he adlig hts. Only use
wet cloths or sponges to prevent scratches . It is best to use soapy
water .
For the sake of the environment
In the interest of the environme nt, the ve hicl e should on ly be washed
in special wash bays. •
Washing your vehicle with a power washer
Cle a ning the exterior o f y o ur car with a hi gh-pressure
po we r w ashe r is s afe as long as y ou observe a few simple
ru les.
- Bef ore using the power wa sher, make su re yo u hav e rea d
and unders tood the WAR NIN GS ~
& in "G ener al in for ­
matio n" o n
pag e 260 .
- Always follow t he o perat in g in struc tions fo r t he power
was her. -
Make sure t hat t he je t o n the spray hose pro duc es a "fan
sha ped spr ay ".
- Do
not ho ld t he spray no zzle too close to so ft mat eria ls.
When cleani ng the vehicle wi th a power washer al ways fo llow the
operat ing inst ruct ions . T his ap plies part icu lar ly to the
operating
pressure
a nd the spraying distance . Keep a distance from soft mate­
r ia ls s uch as rubbe r hoses or insulating material as well as sensors
a nd came ra le n ses.
Do not use
a jet wh ich sprays water in a direct stream or one that has
a rotating je t.
W ate r temperature s houl d no t exceed 140
°F (60 °() .
& WARNING
Never wash tires with a jet that sprays water in a direct stream.
This could cause invisible damage to the tires and weaken them ,
even if the spray is from a relatively long distance and for a short
time . Damaged and weakened tires can fail and cause accidents
and personal injury .
0 Note
To avo id damagi ng your vehicle , a lways ma ke s ure th at ther e is suffi­
cient distance between the s pray head a nd soft mate rials like r ubber
hoses, p las tic pa rt s an d sound -dea den ing ma ter ials. Never ai m the
spray head at the same po int for
a long time. This a lso applies to
cleaning headligh ts a nd pai nte d bu mpe rs. Remember: the close r the
nozzle is to the surface of the material, the greater the stress on the
m at eria l. •