2012 AUDI A3 sensor

56 Clear vis ion
as rain or drizz le re duces visibi lity
through th e windshield.
- The windshie ld must not be treated with
water-repe llent materials. They can in­
crease glare under poor visibility condi­
t ions such as wetness, darkness, or when
the sun is low on the horizon . In addi­
t ion, they can cause th e windshield wip­
ers to chatter.
(D Note
- In the case of frost, check whether the
windsh ield wiper b lades are frozen to
the windshield. Switching on the wind­
shield wipers can damage the wiper
blades!
- Do not use the wipers to clear a frosted
window . U si ng the w ipers as a conven­
i en t ice s craper will destroy the wiper
blades .
- Prior to using a car wash, the windshield
wiper system m ust be switched off (lever
i n position 0) . This helps to prevent unin­
tentiona l switching on and damage to
the windshie ld wiper system.
(D Tips
- The w indshield wipers are swi tched off
when the ignition is turned off. Activate
the windshie ld wipers after the ignition
i s sw itched back on by mov ing the w ind ­
shield wiper lever to any pos it ion.
- Worn or dirty windshie ld wiper blades
cause smearing, which can affect the op­
eration of the light/rain sensor*. Check
the condition of your windshie ld w iper
blades regularly.
- The rai n sensor is part of the interval
wiping system. Tur ning off the ignition
will a lso deact ivate the rain sensor. To re­
activate t he senso r, switch off the inter­
val w iping function, then sw itch it ba ck
on aga in.
- Applies to vehicles with lig ht/ rain sen­
sor: When the wipers are swi tched on
manu ally and in rain condi tions, the au­
tomatic head lights* turn on¢
page 47,
·'t!.-Switching the headlights on and off
or off during the day when the wipers are
no longer operating. The automatic
head lights* funct ion is available in th is
case on ly when the light switch is in the
"A UTO" position¢
page 47, fig. 43.
-Make s ure the washer fluid reservoir in
the engine compartment is topped off
before going on a long trip. Look up
¢
page 211 for check ing and filling the
washer co nta iner .
- The wipers only operate with the hood
completely closed .
is;J Rear window wiper
The wiper lever is also used to operate the
rear window wiper and the automatic wiper/ washer function .
Fig. 5 8 W iper lever: activat ing the rear w indow w iper
and washer
The rear window wiper and the automatic wip­
er/washer functions are activated as follows :
Intermittent wiping
.,. Push the wiper leve r forward towards the
dashboard and to the
first position @
¢
fig. 58. The rear w indow wiper will wipe
the window approx. every four seconds .
Automatic wiper /washer function
.,. Push the wiper lever forward to the second
stop,
position (j) , and hold it there for as
long as you want the rear w iper/washer to
operate.
.,. Release the lever again. The wiper will keep
running for approx. four seconds . .,,_

80 Warm and cold
-Never use the windshield wiper/washer
system in freezing weather until you
have warmed the windshield first, using
the heating and ventilation system. The
washer solution may freeze on the wind­
shield and reduce visibility .
(D Note
-If you suspect that the air conditioner
has been damaged, switch off the air
conditioner and contact an authorized
Audi dealer to have the system inspect­
ed .
- Repairs to the Audi air conditioner re­
quire special technical knowledge and
special tools. Contact an authorized Audi
dealer for assistance.
@ Tips
-Keep the air intake slots (in front of the
windshield) free from ice, snow and de-
Controls
bris in order to maintain the proper func­
tion of the climate control system.
- Air escapes through vents under the rear
window. When placing items of clothing on the luggage compartment cover, en­
sure that the openings are not covered.
- If the inside temperature is very high
(for example, if the vehicle has been
parked in sun), open the windows and al­
low the hot air to escape before turning
on the air conditioner .
- A sensor in the grill provides the air-con­
ditioning system continuously with read­
ings of current outside temperature . So
that the air-conditioning can operate at maximum efficiency, the area below the
front license plate holder must not be
covered .
This overview will help you to familiarize yourself with the air conditioning controls.
Fig. 96 Air condi tion ing con tro ls
The display shows the temperature selected
and the blower setting.
You can set the temperature for the driver's
side using the left rotary switch @and the
temperature for the passenger's side with the
right switch @. Functions are
turned on and off by touching
the buttons. The diode in the buttons illumi­
nates when the function is active.
The grille between the buttons[:]/
G and
IAUTOI must remain unobstructed; there are
measurement sensors behind it.
- Do not seal off the grille.

-Do not clean the gri lle with a vacuum clean­
er, otherwise the sensors cou ld be damaged .
Function
!ACI Switching the cooling system on/off
q page 81
!AUTO I Automatic operation
qpage 81
[:] B Blower speed setting
( in the
q page 83
center)
l=I Manual recirculation mode
qpage82
~ Automat ic recircu lation mode
q page 82
~ Defrost
qpage82
@J Air directed to the windows
¢page83
[1;] Air from the outlets
qpage83
~ Air directed to the footwe ll
~page83
-= -·--~ Rear window defogger
¢page85
The buttons for sett ing the air flow d irection
~. ~and~ can also be pushed in combina­
tion .
~ Switching the air conditioner on/off
Applies to vehicles: with a utomat ic a ir conditioner
... Press the !AC I button to switch the air cond i­
tioner on or off .
When the a ir cond it ione r is sw itched on, t he
i ndicator light in the b utton is lit.
When the a ir cond it ioner is sw itched off, the
cooling system is switched off -th e heat ing
an d vent ilation system is reg ulated automati­
cally. Sw itch ing off the cooling system ( com ­
pressor) saves fuel.
Pl ease keep in mind that with the air cond i­
tioner switched off , the inter io r temperature
cannot be lower than the outside tempe ra­
ture. There is no coo ling and the air is not de -
Warm and cold 81
humid ified (danger o f the windows becom ing
fogged). Cooling mode switches off a utomati­
ca lly when the outs ide temperature is below
zero.
(D Tips
If there is a defect in the a ir conditioner,
the air conditioner cannot be switched on. In this case, the d iode in the button does
not light after being switched on. In the
event of a system fault, please contact an
A udi or specia list garage.
~ Automatic mode
The automatic mode is the standard setting
for all seasons .
Switching on AUTO
... Select tempe rat ure between 64 ° F (+ 18 °()
and 84 °F (+28 °C).
... Press
IAUTOI q page 80, fig. 96 .
AUTO on ly works when you set the inside tem ­
perature between 64 °f (18 °C) and 84 °f
(28 °C). If you select a temperature be low
64 °F (18 °(),
LO will appear in the display . If
you select a temperat ure above 84 °F (28 °C),
HI w ill appea r in t he d isp lay.
The system automatically compensates for changes in outside temperature and for the
i ntensity of the su nlight.
(D Tips
By keeping the IAUTOI button on the dr iv­
er's side pressed for several seconds, the
temperature of the passenger's s ide ca n
be set to the temperature o f th e d river's
side or vice v ersa. The new temperature
setting w ill be shown in the d isplay.

82 Warm and cold
i Setting the temperature
Separate temperatures can be selected for the driver's and front passenger 's side .
.,. Turn the rotary switch @ on the driver 's
s ide and the rotary switch @ on the pas­
senger 's side left(-) or right( +) to control
the temperature
¢ page 80, fig. 96.
There is a time delay before the selected tem­ perature is reached.
(D Tips
The temperature setting for the driver's
side can be transferred to the passenger's
side
¢ page 81.
~ Defrosting/defogging the windshield
The windshield and side windows are quickly
defrosted or defogged
... Press ~¢ page 80, fig. 96.
... Press ~ again or press !AU TO ! to switch off
the defro ster.
The temperature is automatica lly controlled .
Maximum airflow is primarily blown in
through outlets
(D , @ and ®¢ page 84.
Outlets @ can be opened and closed with the
controls behind them. Outlets @and ® must
be opened so the windows can be defrosted as
quickly as possible.
By pressing ~ and air recirculation are switch­
ed off .
~ Manual air recirculation mode
The recirculation mode prevents polluted out­
side air from entering the vehicle interior.
Switching on air recirculation
.,. Press the button I"" !¢ page 80, fig. 96
¢,&. .
Switching off air recirculation
.,. Press the button 1...,1 again, or
... Press the !AU TO
I button, or
... Press the~ button . In air recirculation
mode, air is drawn from
the ve hicle interior and recirculated. We rec­
ommend that yo u use the manua l air recircu­
lation mode under the follow ing cond itions:
When driving thro ugh a tunnel or in a traffic
jam so that exhaust fumes cannot enter the
vehicle interior.
A WARNING
-
Do not use this setting for extended peri­
ods of time. The windows cou ld fog up
since no fresh air can enter the vehicle.
If
the windows fog up, press the air r ecircula­
tion button again immediately to switch
off the air re cir cula tion function or select
defrost.
~ Automatic air recirculation
If outside air is polluted, an air quality sensor
in the vehicle will automatically switch on the
air recirculation .
Switching on air recirculation
.,. Press ~¢ page 80 , fig . 96 .
Switching off air recirculation
... Press ~ again, or
.,. press !AUTO !, or
.,. press ~.
The automatic air recirculation mode should
normally be left switched on at all times.
T he system is ready to operate approximately
30 seconds after you turn on the ignition or
start the vehicle. Fresh air enters the vehicle
only during this initialization period .
T he air quality sensor for detecting diesel and
gasoline exhaust fumes switches automatica l­
l y to air recirculation mode if the outside air is
heavily polluted. The supply of outside air is
closed off.
As soon as the pollution level drops, fresh air
is automatically supplied to the vehicle interi­
or again .

@ Tips
You can find out if your vehicle is equipped
w ith "H ill ho ld assis t" at an authorized Au­
di dea le rship.
Acoustic parking
system
Rear acoustic park assist
Applies to vehicles: with 4-cha nnel acoustic park assist
Acoustic park assist gives a warning about
obstacles behind the vehicle.
Desc ription
The rear acoust ic park assist (4-channe l
acoust ic pa rk assist) dete rm ines the d istance
of the vehicle from an obstacle us ing u ltra­
sonic sensors . The sensors are in the rear
bumper . The vol ume and the pitch of the
chimes can be adjusted through the menu dis­ p lay
c::> page 27.
The range at which the sensors start to meas­
ure is
about :
To the side
Center rear
Activation
2 feet (0.60 m)
S feet (1.60 m)
The parking assist is ac tivated when re ver se
gear
i s engaged. A brief tone confirms tha t
the system is activated.
Backing up
Distance warning when backing up starts
when an obstacle is detected in the range of
the park assist sys tem. As t he d istance de­
creases, t he time interva l be tween the audib le
tones becomes sho rter.
When the d istance is less than 1 foot (0 .30
m), the tone becomes cont inuous . At t his
po int yo u should stop b acking up.
P lease note that low objects already signalled
by a wa rning can disappear from the system 's
detection range and w ill not continue to be
signa lled.
On th e ro ad 93
Potent ial malfunct ions
If a warning bu zzer so unds fo r a few seconds
when the ignition is switched o n, there is a
system malfunction with the acoustic park as ­
sist. If the ma lfunction persists unti l the igni­
tion is switched off, there will be no aco ustic
warning at the next attempt to act ivate the
system. Have the prob lem corrected.
There is no conf irmation tone when reve rse
gear is engaged if there is a system malfunc­
tion.
For t he parking assist to ope rate, the sensors
must be kept clean and free of ice.
A WARNING
- Sensors have blind spots in wh ich objects
cannot be detected. Pay spec ia l attent ion
to small children and a nimals . They can­
not a lways be detected by the sensors -
danger of an accident!
- The parking assist ca nnot replace the
driver's atte ntion. The driver alone is re­
sponsib le for pa rking and simi lar d riving
maneuve rs. Always wat ch whe re you are
d riving.
(D Note
L ow obstacles already signa lled by a warn­
i ng can d isapp ear from the system's detec­
tion range as they a re approached and w il l
not cont inue to be s ignalled. Objects such
as barrier chains, trailer d raw bars, th in
painted vertica l poles, o r fences may not
be detected by the system -risk of dam­
age.
(D Tips
Fo r the parking assist to operate, the sen­
sors m ust be kept clean and free of snow
and ice.

the forward-facing child restraint. The backrest must be adjusted to an upr ight
posit ion.
- Make sure that the
PASSENG ER AI R BA G
OFF
light comes on and stays on all the
t ime whenever the ignition is switched
on.
Advanced Airbag System components
The front passenger seat in your vehicle has a
l ot of very important parts of the Advanced
Airbag System in it. These parts include the
weight-sens ing ma t, sensors, wiring, brack­
ets, and mo re. The function of the system in
the front passenger seat is checked by the
e lectronic control unit when the ignition is on .
The control unit monitors the Advanced Air­ bag System and turns the airbag indicator
light on when a malfunction in the system
components is detected. The function of the
airbag ind icator light is described in greater
deta il below. Because the front passenger
seat contains impo rtant parts of the Ad­
vanced A irbag System, you m ust take care to
p revent 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 Advanc ed Airbag Syst em
con sis ts o f th e following :
-Crash sensors in the front of the vehicle that
measure vehicle acceleration/deceleration
to provide information to the Advanced Air­ bag System about the severity of the crash.
-An electronic control unit, with integrated
crash sensors for front and side impacts .
The cont ro l unit "decides" whether to fire
the front airbags based on the information r eceived from the c rash sensors. The control
unit a lso "dec ides" whet her the safety be lt
pretensione rs should be activated.
- An Advanced Airbag with gas generator for
the d river ins ide the steer ing whee l hub.
- An Advanced Airbag with gas generator in­
s ide t he instr ument pane l for the front pas­
senger.
A irbag system 129
- A weight-sensing mat under the upho lstery
padding of the front passenger seat cushion
that measures the total weight on the seat .
The informat ion reg istered is sent continu­
ously to the electron ic control unit to regu­
late deployment of the front Advanced Air­
bag on the passenger side.
- An airbag monitoring system and ind icator
light in the instrument cluster
¢page 133.
-The PASSENGER AIR BAG OFF light comes
on and stays on in the center of the instru­
ment panel
c:::> page 133, fig . 134 and tells
you when the front Advanced Airbag on the passe nger side has been tu rned off.
- A senso r below the safety belt latch fo r the
front seat passenger to measure the tension
on the safety be lt. T he ten sion on the safety
be lt and the weight regis tered by the
weight -sensing mat he lp the control unit
"decide" whether the front airbag fo r the
front passenger seat should be turned off or not
¢ page 123, Child restraints on the
front seat -some important things to
know.
-A sensor in the safety belt latch for the driv­
er and for the front seat passenger that
senses whether that safety belt is latched or
not and transmits this information to the
electronic contro l un it .
A WARNING
D amage to the front passenger seat can
p revent the front airbag from wor king
properly.
- Imp roper repai r or d isassembly of the
fr on t passenge r and dr iver seat will pre­
vent the Advanced Airbag System from
functioning p roperly.
- Repairs to the front passenger seat must
be pe rformed by qualified and p roperly
trained workshop personne l.
- Never remove the front passenger or driver seat from the vehicle .
- Never remove the upho lstery from the
front passenger seat .
- Never disassemble or remove p arts from
-
the sea t or disconnect wires from it. ..,.
•
•

130 Airbag system
-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 pas­
senger seat. Parts of the Advanced Air­
bag System under the passenger seat
could be damaged, preventing them and
the airbag system from working proper­
ly.
- Never place seat covers or replacement
upholstery that have not been specifical­
ly approved by Audi on the front seats.
- Seat covers can prevent the Advanced Airbag System from recognizing child re­
straints or occupants on the front pas­
senger seat and prevent the side airbag
in the seat backrest from deploying prop­
erly .
- 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 function­
ing properly.
- If you must use a child restraint on the
front passenger seat and the child re­
straint manufacturer's instructions re­
quire 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 re­
straint is installed on the front passen­ ger seat .
- If the
PASSENGER AIR BAG OFF light
does not come on and stay on, immedi­
ately install child restraint in a rear seat­
ing position and have the airbag system
inspected by your authorized Audi dealer.
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 belts
with pretensioners and load limiters and the
adjustable head restraints to help reduce the
risk of injury in a wide range of accident and
crash situations. Be sure to read the impor­
tant information about safety and heed the
WARNINGS in this chapter.
Deployment of the Adva need Airbag System
and the activation of the safety belt preten­
sioners depend on the deceleration measured
by the crash sensors and registered by the
electronic control unit. Crash severity depends
on speed and deceleration as well as the mass
and stiffness of the vehicle or object involved
in the crash.
When the electronic control unit registers a
low severity crash and the safety belt is being
used , the airbag will not deploy. If the safety
belt is not being used, the first stage deploys,
followed by the second stage after a much lat­
er time in the crash sequence.
If the electronic control unit registers a crash
of medium severity, the first stage of the air­
bag deploys followed by the second stage at a
much later time in the crash sequence - re­
gardless of whether the safety belt is being
used or not . In higher severity crashes as reg ­
istered by the electronic control unit, both the
first and second stages deploy almost at the same time.
On the passenger side, regardless of safety
belt use, the airbag will be turned off if the
weight on the passenger seat is less than the
amount programmed in the electronic control
unit. The front airbag on the passenger side
will also be turned off if one of the child safe­
ty 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 ..,_

Monitoring the
Advanced Airbag
System
I Airbag monitoring indicator light
Two separate indicators monitor the function
of the Advanced Airbag System: the airbag
monitoring indicator light and the
PAS SEN ­
GER AIR BAG OFF
light.
The Advanced Airbag System (including the
e lectronic control unit, sensor circuits and sys­
tem wiring) is monitored continuously to
make sure that it is functioning properly
whenever the ignit ion is on . Each t ime you
turn on the ignition, the airbag monitor ing in­
d icator light
I will come on for a few seconds
(self diagnostics) .
t!i The syste m mus t be insp ected when the
indicato r light:
- does not come on when the ignit ion is
switched on,
- does not go out a few seconds after yo u
have switched on the ignition, o r
- comes on while d riving .
If an airbag system malfunction is detected,
the
I indicator light will first start flashing to
catch the driver's attention and then stay on
continuously to serve as a constant reminder
to have the system inspected immediately.
If a malfunction occurs that turns the front
a irbag on the passenger side off, the
PASSEN­
GER AIR BA G OFF
light will come on and stay
on whenever the ignition is on.
_& WARNING
An airbag system that is not funct ioning
properly cannot provide supp lemen tal p ro­
tection in a frontal crash.
- If the airbag indicator l igh t comes on, it
means that there may be something
wrong wit h the Advanced Airbag System.
It is possible that the airbag will inflate
when it is not s upposed to, or wi ll not in­
flate when it should.
-
Airba g sy stem 133
-Have the airbag system inspected imme­
diate ly by you r authorized Aud i dea ler.
PASSENGER AIR BAG OFF light
F ig . 1 34 Sect ion from th e ce nter console: PASSENGER
AIR BAG O FF light
The PAS SENGER AIR BAG OFF light is located
in the center console
c::> fig. 134.
The PA SSENGER AIR BAG OFF light will come
on and stay on to tell you when the front Ad­
vanced Airbag on the passenger side has been
turned off by the electron ic control unit. Each
time you turn on the ignit ion, the
PAS SEN­
GER A IR BAG OFF
light will flash for a few
seco nds and:
- will stay on if the front passenger seat is not
occupied,
- will stay on if there is a small ch ild or child
restraint on the front passenger seat,
- will go out if the front passenger seat is oc­
cupied by an adult as registered by the
weight-sensi ng mat.
The
PA SSENGER AIR BAG OFF light must
come on and st ay on
if the ignition is on and
- a car bed has been installed on the front
seat, or
- a rearward -facing child restraint has been
installed on the front passenger seat, or
- a forward -facing chi ld restraint has been in­
stalled on the front passenger seat, or
- t he weight reg iste red on the fron t passen-
ger seat is equal to or less than the com -
bined weight of a typical 1 year-old restrain­
ed in one of the rear-facing or forward -fac-
ing infant restraints listed in Federal Motor
Vehicle Safety Standard 208 with which the ..,_