2011 AUDI A3 lock

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& WARNING
Rearward-facing child restraints:
• A child in a rearward-facing child safety seat installed on the
front passenger seat will be seriously injured and can be killed if
the front airbag inflates -even with an Advanced Airbag System.
• The inflating airbag will hit the child safety seat or infant
carrier with great force and will smash the child safety seat and
child against the backrest, center armrest, door or roof.
• Always be especially careful if you must install a rearward
facing child safety seat on the front passenger seat in exceptional
circumstances.
• A tight tether strap on a rearward-facing child restraint
attached to the front passenger seat can put too much pressure on
the weight-mat in the seat and register a heavier weight in the
Advanced Airbag System. The heavier weight registered can make
the system work as though an adult were on the seat and deploy
the Advanced Airbag when it must be suppressed causing serious
or even fatal injury to the child.
• Make sure that the PASSENGER AIR BAG OFF light comes on
and stays on all the time whenever the ignition is switched on.
• If the PASSENGER AIR BAG OFF light does not come on and
stay on, immediately install the rear-facing child safety seat in a
rear seating position and have the airbag system inspected by
your Audi dealer. •
Activating the convertible Locking retractor
Use the convertible locking retractor to secure a child
restraint.
Always heed the child safety seat manufacturer's instruc­
tions when installing a child restraint in your vehicle. To acti­
vate the convertible locking retractor:
Controls and equip­
ment Safety first Vehicle operation
-
Place the child restraint on a seat, preferably on the rear
seat.
- Slowly pull the belt
all the way out.
- Route it around or through the child restraint belt path
=>& .
- Push the child safety seat down with your full weight to
get the safety belt really tight.
- Insert the belt tongue into the buckle for that seating
position.
- Guide the safety belt back into the retractor until the belt
lies flat and snug on the child safety seat.
- You should hear a "clicking" noise as the belt winds back
i nto the inertia reel. Test the convertible locking retractor
by pulling on the belt. You should no longer be able to pull
the belt out of the retractor. The convertible locking
retractor is now activated.
- Make sure that the red release button is facing away from
the child restraint so that it can be unbuckled quickly.
- Pull on the belt to make sure the safety belt is properly
tight and fastened so that the seat cannot
move forward
or sideways more than one inch (2.S cm).
& WARNING
Using the wrong child restraint or an improperly installed child
restraint can cause serious personal injury or death in a crash.
• Always make sure that the safety belt retractor is locked when
installing a child safety seat. An unlocked safety belt retractor
cannot hold the child safety seat in place during normal driving or
in a crash. ._
Vehicle care Do-it-yourself service Technical data

• .___C_ h_ il_d _ S_a _ f_ e _ t--= y '------------------------------------------------
& WA RNING (conti nued)
• Always bu ckle the child safety seat firmly in place even if a
child i s not sitting in it . A loo se child safety seat can fly around
during a sudden stop or in a crash.
• Always make sure the seat backre st to which the child restraint
is installed is in an up right position and securely latched into place
and cannot fold forward . Otherwise, the seatback with the child
safety seat attached to it could fly forward in the event of an acci ·
dent or other emergency situation.
• Alway s read and heed all WARNINGS wheneve r using a child
restrained in a vehicle is being used=>
page 167. Special precau­
tions apply when installing a ch ild safety seat on the front
passenger seat =>
page 147, "Child restraints on the front seat -
some important things to know ".•
Deactivating the convertible Locking
retractor
The convertible l ocking retrac tor for child restraints will
be d eactivated automatically when the belt is wound all
the way back into the retractor.
- P ress t he red butto n on t he safety be lt buckle . T he belt
to ngue will pop out o f the buckle.
- G uid e the s afety belt all the way back in to its stowed posi-
t ion .
Always le t the safety be lt retract comple tely i nto i ts s towed position.
T he safety bel t can now be used as an ord inary safety belt without the
convertib le locking ret ractor for ch ild rest raints.
If th e convertible locking r etractor should be activated inadve rtently,
the safety be lt must be un fastened and guided comp letely back into
i t s s towe d position to de activa te th is fe ature. If th e convert ible locking retractor is
not deact ivated, the safety belt w ill gradua lly
become tigh ter and uncomfo rtable to we ar.
& WARNING
Improperly in stalled child safety seats increase the risk of serious
personal injury and death in a collision.
• Never unfasten the safety belt to deactivate the convertible
lo cking retractor for child restraints while the vehicle is moving.
You would not be restrained and could be seriou sly injured in an
a ccident .
• Always read and heed all WARNINGS whenever u sing a child
restrained in a vehicle is being used =>
page 167. Special precau·
tions apply when in stalling a child safety seat on the front
passenger seat =>
page 147, "Child restraints on the front seat -
s ome important things to know ".•
LATCH Lower anchorages and
tethers for children
Child Restraint System anchors and how
are they related to child safety
T o prov ide a s imp le r a nd more practic able way to a ttach the child
restraint on the vehicle seat, Federal regulat ions require special
lowe r anch orages in ve hicl es and devi ces on new ch ild rest rain ts to
attac h to the veh icle anchorages.
Th e combination of the tether anchorages and the lower anchorages
is now gene rally called the
LATCH sys tem fo r "Lowe r Anch orages and
T ethers for Children ."
Forw ard -fa cing child res train ts manuf actured aft e r September 1,
1999, are required by U.S. federa l regu lat ions to comp ly with new
c hild head moveme nt performan ce requirements. These new per for -
~

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Installing a child restraint with LATCH
lower anchorages
Whenever you install a child restraint always follow the
child restraint manufacturer's instructions .
Mounting
Fig. 151 Lower
anchorages: proper
mounting
- Remove the cover* to access the lower anchorage attach ­
ment points.
- Make sure the seatback of the rear seat bench is in the
upright position and securely latched in place .
- Attach both hook-on connectors with the spring catch
release on the child safety seat onto the LATCH lower
anchorage so that the connectors lock into place
=> fig. 151.
-Pull on the connector attachments to make sure they are
properly attached to the LATCH lower anchorage.
- Pull straps tight following the child restraint manufac­
ture r's instructions.
Controls and equip­
ment Safety first Vehicle operation
Releasing
-
Loosen the tension on the straps following the child
restraint manufacturer's instructions.
- Depress the spring catches to release the anchorage hooks
from the lower anchorages .
Remember: Use tether straps to help keep the child restraint firmly
in place.
& WARNING
Improper use of the LATCH system can increase the risk of serious
personal injury and death in an accident.
• These anchors were developed only for child safety seats using
the "LATCH" system.
• Never attach other child safety seats, belts or other objects to
these anchors.
• Always make sure that you hear a click when latching the seat
in place. If you do not hear a click the seat is not secure and could
fly forward and hit the interior of the vehicle, or be ejected from
the vehicle.
& WARNING
Improper installation of child restraints will increase the risk of
injury in an accident.
• Always follow the child restraint system manufacturer's
instructions for proper installation of the child restraint system
and proper use of tether straps as well as the lower anchorages or
safety belts in your vehicle.
• Always read and heed the important information and WARN­
INGS about child safety and the installation of child restraint
systems =>
page 167, "Child Safety". •
Vehicle care Do-it-yourself service Technical data

Intelligent technology
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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
The Electronic Stability Program increases driving
stability .
With ESP, contro l over the vehicle is increased in situations when the
vehicle is close to the limits of grip, such as dur ing accelerat ion and in
curves. ESP reduces the risk of sk idding and improves vehicle stability
unde r all road conditions.
It operates at all speeds.
The Anti-Lock Brake System (ABS), Electronic Differential Lock (EDS) and Anti-Slip Regulation System (ASR) are integrated in the Elec­
tronic Stability Program .
How ESP works
The ESP control unit processes the following data from high-sensitive
sensors: the rotationa l speed of the vehicle about its vertical axis,
fore-and -aft and lateral acceleration forces, brake pressure and
steering angle .
Us ing stee ring ang le and vehicle speed, the direction the driver
wishes to travel is determined and continuously compared with
actual vehicle behavior. If the two do not match, for example when
the vehicle beg ins to skid, ESP brakes the appropriate whee l auto­
matically.
The vehicle is stabilized aga in by the forces act ing on the whee l
during braking. With an oversteering veh icle (tendency for the rear
end to skid out of the curve), the brake app lication is mainly at the
front wheel on the outside of the curve, with an understeering vehicle
(tendency to run wide in the curve) at the rear wheel on the insid e of
the curve or additionally at the other wheels as needed. This brake
application is accompanied by noises. _,

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ESP works in co njunction w ith ABS~ page 192 . If there is malfunc­
t ion in the ABS, ESP is also inoperat ive.
& WARNING
• The limit s of phy sics cannot be su spended by ESP. Even in vehi­
cles with ESP, you should always adapt your driving to road and
traffic conditions. Thi s is particularly true on a slippery and wet
road. Do not be tempted by the increased safety provided to take
ri sk s - danger of an a ccident!
• Please note that when ESP / ASR is deact ivated , the drive
wheel s can spin on icy and slippery roads and the vehicle can break
away -danger of skidd ing! •
Switching on and off
Fig. 155 C ente r
con sole w ith ESP
s wit ch
Th e ESP i s automa tically activ ated w hen the eng ine is st arted, and i t
performs a self-test. As soon as the test is comp leted, the system is
in normal operat ing mode .
Deactivating
ES P s hould no rm ally be activate d at all times beca u se this ens ures
optimum veh icle stability. Only in some cases it does make sense to
de activ at e t he Elect roni c Stabili ty Pr ogr am ( ES P) by p ress ing the
button~ fig. 155. Deact ivat io n i s indicated by the ESP lamp
J! in the
Controls and equip­
ment Safety first
Vehicle operation
instrument cluster flashes . The message ESP OFF appears in the
ins trument cl uste r. Ant i-Slip Regula tion is comp le tely deact iv a te d
and the stab ilizat io n effects from the ESP system are lim ited. This
ma kes a more agile and spo rty driving sty le possible, but the full
extent o f th e stabilization function is not available .
Activating
~~~= Press the [ESP OFF ) button again~ fig. 155 . The ind icator lig ht
goes out . The message
ESP ON appears br iefly in the ins trumen t
cluster disp lay .
& WARNING
You should only switch the ESP off if your driv ing ability and the
traffic situation allow. Please note that when ESP /ASR i s dea cti­
vated, the drive wheels can spin on icy and slippery roads and th e
vehicle can break away -danger of skidding!
[ i ] Tips
If Audi magnetic r ide* is ma lf u nct io ning, the ESP may not sw itch off
or it may switch off automatically . •
Electronic differential lock (EDL}
The ele ctr onic dif ferential lock mo nit ors the rot ational
s p eed of the d rive wheels .
General notes
The elec tron ic differe ntia l lock ( EDL) helps the ca r to sta rt movin g,
acce le ra te and climb a gradient on surfaces provid ing poor or almost
no grip. Without E DL, this would be difficult, if not impossible.
How the system works
Th e E DL operates au tomatically . It mo nitors the rotational s peed of
t he drive wheels on an axle with the he lp of the ABS sensors
~ page 19 2. If a noticeable difference in rotational speed between ..
Vehicle care Do-it-yourself service Technical data

Intelligent technologyL ______________________________________ _
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 other 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 sp in is being controlled .
Driving off
When driving off, always be sure to keep road conditions in mind as
you accelerate . If one drive wheel spins because it is on a surface with
less grip, gradually increase the pressure on the accelerator pedal
until the car starts to move. The wheel less ab le to transfer power
spms .
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads, the EDL cuts out temporarily. The
vehicle remains operat ional and behaves in the same way as a vehicle
without EDL .
As soon as the brake has cooled down, EDL switch es on again auto­
matically.
Electronic limited slip differential*
In vehicles w ith front wheel drive*, an electronic lim ited slip differen­
tial engages when driving on curves. The brakes are applied spec ifi­
cally to the front wheel that is on the inside of the curve. This mini­
m izes sliding on the front wheels and enables precise and neutral
driving through curves. The electronic limited slip differential does
not engage when d riving in wet conditions or snow.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL and the ele ctronic limited slip differential working,
the drive wheels can spin and reduce your ability to control your
ca r. -Risk of crash!
& WARNING (continued)
• The increased safety afforded by EDL and the electronic limited
slip differential does not mean that you can take safety risks .
Always adapt your driving style to the road conditions and traffic
situation.
[I) Tips
If a fau lt occurs in the ABS, the EDL is also not f unct ioni ng. This is
indicated by the ABS warning light=>
page 16.
Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Sl ip Regu lation System (ASR) is integrated in the electronic
stabili zation program (ESP) . When the vehicle starts up and acceler­
ates, the wheels are prevented from sp inning by adjust ing the engine
power to match the amount of grip available from the road surface.
How the system works
ASR performs automatica lly, i.e. without the driver's intervention.
With the aid of the ABS sensors=>
page 192, ASR monitors the speed
of the driven wheels. If the wheels start to spin, the engine torque is
reduced automatically until the tires find enough grip to lock onto
the road surface. The system is active across the entire speed range.
The ASR works in conjunction with the ABS. If a malfunction shou ld
occur in the ABS, the ASR w ill also be out of action .
[I) Tips
To ensure that the ASR works properly, all four wheels must be fitted
with identical tires. Any differences in rolling radius of the tires can .,

Intelligent technology
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& WA RNING (conti nu ed )
• Do not "ride the brakes " by re sting your foot on the pedal when
you do not intend to brake . Thi s may cause the brakes to overheat,
premature wear and increased stopping distance.
• Under certain climatic and operating condition s such as
pa ssing through water, dr iving in heavy rain or after washing the
vehicle, the effectiveness of the brake s can be reduced . In winter ,
ice can accumulate on the brake pads , linings , discs and drums .
Carefully apply brakes for a te st. Brakes will dry and ice coatings
will be cleaned off after a few careful brake applications.
• Driving for an extended period of time on salt-covered roads
without using your brakes can al so affect br aking efficiency. Clean
off accumulated salt coating from brake disc s and pads with a few
careful brake applic ations.
• If you damage the front spoiler , or if you in stall a different
spoile r, be sure the air flow to the front brakes is not obstructed.
Otherwi se th e brake system could overheat reducing the effective­
ness of the entire brake system.
• Failure of one brake circuit will impair the braking capability
resulting in an inc reased stopping distance. Avoid driving the
vehicle and have it towed to the nearest authorized Audi dealer or
qualified wo rkshop .
.J
Brake booster
T h e brake booste r adds ext ra braking p ower.
The brake booster works with vacuum pressure which is created on ly
w hen the eng ine is ru nnin g=>&.
& WARNING
• Never let the vehicle roll to a stop with the engine shut off.
• If the brake boo ster i s not working , for example when towing
your veh icle , or because the brake booster has somehow been
& W ARNING (continued )
damaged , the brake pedal must be p ressed considerably harder to
make up for the la ck of booster assi stan ce. •
Functioning of Anti-Lock Brake System
{ABS)
ABS prevents the wheels from l ockin g up under br aking.
Th e ABS contr ibutes effectively to vehicle co ntrol s ince it prevents t he
w heels from
locking when the brakes are applied . This means that the
veh icle rema ins steerable and is less likely to skid .
With ABS you do not need to pump the brake. Just hold the brake
pedal down .
However, do no t expect that the ABS shortens bra king d istance under
all circumstances . When dr iv ing on grave l or on newly falle n snow on
top of icy s urfaces, braking d istance may be even longer, therefo re,
under these circumstances, it is especially important that yo u drive
slowly and with g re at c are.
How the ABS system works
An au tomatic c hec k is made when a speed of about 4 mp h (6 km/ h) is
reached. When t his happens, a pump ing noise can be heard.
If an ind ivi dual wheel begi ns to rot ate too s low ly in relat ion to ve hicle
speed and tends to loc k, t he ABS automatically reduces brake pres­
s ur e to p revent t hat wheel from lo cking.
T hi s au tomatic adjustment p rocess w ill cause a
s light vibration of
the bra ke pedal and some noises to a lert you that vehicle speed must
be adapted to ex isting road and traffic co nditions .
& WARNING
Although the ABS is very effective, always remember that braking
capability is limited by tire traction. Always adjust your driving ...

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Battery diagnosis
Battery diagnosis continuously determines the state of the battery.
Sensors determine battery voltage, battery current and battery
temperature. This determines the current state of charge and the
power of the battery .
Idling current management
Idling current management reduces energy consumption while the
vehicle is standing. With the ignition switched off, it controls the
energy supply to the various electrical components. Data from
battery diagnosis is considered.
Depending on the battery's state of charge , individual consumers are
gradually turned off to prevent excessive discharge of the battery and
thus maintain starting capability.
Dynamic energy management
While the vehicle is being driven, dynamic energy management
distributes the energy generated according to the needs of the indi­
v idual components. It regulates consumption, so that more electrical
energy is not being used than is being generated and ensures an
optimal state of charge for the battery.
[ i] Tips
• But even energy management cannot negate the limits of physics.
Consider that the power and life of a battery are limited.
• If starting ability is threatened, you are informed by a warning
=> page 196, "Driver notification in the instrument cluster display". •
What you should know
The highest priority is given to maintaining starting capa­
bility.
The battery is severely taxed in short-distance driving, in city traffic
and during the cold time of year. Abundant electrical energy is
Controls and equip­
ment Safety first Vehicle operation
required, but only a little is generated. It is also critical if the engine
is
not running and electrical components are turned on. In this
instance energy is being consumed but none is being generated .
It is in precisely these situations that you will notice energy manage­
ment actively regulating the distribution of energy.
Vehicle stands for an extended period
If you do not drive your vehicle over a period of several days or weeks,
electrical components are gradually cut back or switched off. This
reduces energy consumption and maintains starting capability over a
longer period.
Take into consideration that when you unlock your vehicle, some
convenience functions, such as the remote key or power seat adjust ­
ment, may not be available. The convenience functions will be avail­
able again when you turn on the ignition and start the engine .
With the engine turned off
If you listen to the radio, for example, with the engine turned off, the
battery is being discharged.
If starting capability is jeopardized due to energy consumption, a
message appears in the driver information display.
You have to start the engine to charge the battery.
With the engine running
Although electrical energy is generated when the vehicle is being
driven, the battery can become discharged. This happens mostly
when little energy is being generated and a great deal consumed and
the battery's state of charge is not optimal.
To bring the energy balance back into equilibrium, consumers which
require especially large amounts of energy are temporarily cut back
or switched off. Heating systems in particular require a great deal of
energy . If you notice, for example , that the heated seats* or the
heated rear window are not heating, they have been temporarily cut
back or switched off. These systems will be available again as soon as
the energy balance has been restored. .,
Vehicle care Do-it-yourself service Technical data