wheel AUDI A3 CABRIOLET 2015 Service Manual

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

162 Airbag system
Repair, care and disposal of the airbags
Parts of the airbag system are installed at
many different places on your Audi. Installing,
removing, servicing or repairing a part in an
area of the vehicle can damage a part of an
airbag system and prevent that system from
working properly in a collision.
There are some important things you have to know to make sure that the effectiveness of
the system will not be impaired and that dis­
carded components do not cause injury or pol­ lute the environment.
A WARNING
Improper care, servicing and repair proce­
dures can increase the risk of personal in­
jury and death by preventing an airbag from deploying when needed or deploying
an airbag unexpectedly:
- Never cover, obstruct, or change the
steering wheel horn pad or airbag cover
or the instrument panel or modify them
in any way.
- Never attach any objects such as cup
holders or telephone mountings to the
surfaces covering the airbag units.
- For cleaning the horn pad or instrument
panel, use only a soft, dry cloth or one
moistened with plain water. Solvents or
cleaners could damage the airbag cover
or change the stiffness or strength of the material so that the airbag cannot de­
ploy and protect properly.
- Never repair, adjust, or change any parts
of the airbag system.
- All work on the steering wheel, instru­
ment panel, front seats or electrical sys­
tem (including the installation of audio
equipment, cellular telephones and CB
radios, etc .) must be performed by a
qualified technician who has the training
and special equipment necessary.
- For any work on the airbag system, we
strongly recommend that you see your
authorized Audi dealer or qualified work­
shop. -
Never modify the front bumper or parts
of the vehicle body.
- Always make sure that the side airbag
can inflate without interference:
- Never install seat covers or replace­
ment 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
inflate.
- Damage to the original seat covers or
to the seam in the area of the side air­
bag module must always be repaired
immediately by an authorized Audi
dealer.
- The airbag system can deploy only once.
After an airbag has been deployed, it must be replaced with new replacement
parts designed and approved especially
for your Audi model version. Replace­
ment of complete airbag systems or air­
bag components must be performed by
qualified workshops only . Make sure that
any airbag service action is entered in
your Audi Warranty
& Maintenance book­
let under
AIRBAG REPLACEMENT RE­
CORD.
- For safety reasons in severe accidents,
the alternator and starter are separated
from the vehicle battery with a pyrotech­ nic circuit interrupter.
- Work on the pyrotechnic circuit inter­
rupter must only be performed by a
qualified technicians who have the ex­ perience, information and special tools
necessary to perform the work safely.
- If the vehicle or the circuit interrupter
is scrapped, all applicable safety pre­
cautions must be followed.
@) For the sake of the environment
Undeployed airbag modules and preten­
sioners might be classified as Perchlorate
Material -special handling may apply, see

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www.dtsc.ca.gov/hazardouswaste/per­chlorate. When the vehicle or parts of the
restraint system includ ing airbag modules
and safety belts with pretensioners are
scrapped, all applicable laws and regula­
tions must be observed. Your authorized
Audi dealer is familiar with these require­
ments and we recommend that you have
your dealer perform this serv ice for you.
Other things that can affect Advanced
Airbag performance
Changing the vehicle's suspension system can
change the way that the Advanced Airbag Sys­
tem performs in a crash. For example, using
tire-r im combinations not approved by Audi,
lowering the vehicle, changing the stiffness of
the suspension, including the springs, suspen­
sion struts, shock absorbers etc. can change
the forces that are measured by the airbag sensors and sent to the electron ic control
unit. Some suspension changes can, for exam­
ple, increase the force levels measured by the
sensors and make the airbag system deploy in
crashes in which it would not deploy if the
changes had not been made. Other kinds of
changes may reduce the force levels meas­
ured by the sensors and prevent the airbag
from deploying when it should .
A WARNING
Changing the vehicle's suspension includ­
ing use of unapproved tire-rim combina­
tions can change Advanced Airbag per­
formance and increase the risk of serious
personal injury in a crash.
- Never install suspension components
that do not have the same performance characteristics as the components origi­
nally insta lled on your vehicle.
- Never use tire-rim combinations that
have not been approved by Audi.
Airbag system 163
Knee airbags
Description of knee airbags
Applies to vehicles: wi th knee airbags
The knee airbag system can provide supple­
mental protection to properly restrained
front seat occupants.
Fig. 144 Driver 's kn ee airbag
The dr iver knee airbag is in the instrument
panel underneath the steering wheel
¢
fig. 144, the airbag for the passenger is at
about the same height in the instrument pan­
el underneath the glove compartment.
The knee airbag offers additional protection
to the driver's and passenger's knees and up ­
per and lower thigh areas and supplements
the protection provided by the safety belts.
If the front airbags deploy, the knee airbags
also dep loy in frontal collisions when the de­
ployment threshold stored in the control unit
is met¢
page 156, More important things to
know about front airbags.
In addition to their normal safety function,
safety belts help keep the driver or front pas­
senger in position in a frontal collision so that
the airbags can provide supplemental protec­
tion.
The airbag system is not a substitute for your
safety belt. Rather, it is part of the overall oc­
cupant restraint system in your vehicle. Al­
ways remember that the airbag system can
only help to protect you if you are wearing
your safety be lt and wearing it properly. This
is why you should always wear your safety
belt, not just because the law requires you to
do so
¢page 138, General notes. ..,_

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Fully inflated airbags in combination with
properly worn safety belts slow down and lim­
it the occupant's forward movement and help
to reduce the risk of injury.
Important safety instructions on the
knee airbag system
App lies to vehicles: with knee airbags
Airbags are only supplemen tal restraints. Al­
ways wear safety belts correctly and ride in a
proper seating position.
There is a lot that you and your passengers
must know and do to help the safety belts and
airbags to provide supplemental protection .
A WARNING
An inflating knee airbag can cause serious
injury. Wearing safety belts incorrectly and
improper seating positions increase the
risk of serious personal injury and death
whenever a vehicle is being used.
- The knee airbag system cannot protect
you properly if you are seated too close
to any of the airbag locations. When ad­
justing their seat positions, it is impor­
tant that both the driver and the front passenger keep their upper bodies and
knees at the following minimum safe
distances:
- at least 10 inches (25 cm) between the
chest and the steering wheel/instru­
ment panel.
- at least 4 inches (10 cm) between the
knees and the lower part of the instru­
ment panel.
- The risk of personal injury increases if
you lean forward or to the side, or if the
seat is improperly positioned and you are
not wearing your safety belt. The risk in­
creases even more should the airbag de­ ploy.
- Always make sure that the knee airbag can inflate without interference. Objects
between you and the airbag can increase
the risk of injury in an accident by inter­
fering with the way the airbag deploys or
Airbag system 165
by being pushed into you as the airbag
deploys.
- Never let anybody, especially children
or animals ride in the footwell in front
of the passenger seat.
If the airbag de­
ploys, this can result in serious or fatal
injuries.
- Never carry objects of any kind in the
footwell area in front of the driver's or
passenger's seat. Bulky objects (shop­
ping bags, for example) can interfere
with or prevent proper deployment of
the airbag. Small objects can be
thrown through the vehicle if the air­ bag deploys and injure you or your pas­
sengers .
- Make sure there are no cracks, deep scratches or other damage in the area of
the instrument panel where the knee air­
bags are located.
- If children are incorrectly seated, their
risk of injury increases in a collision
~page 169, Child Safety .
Side airbags
Description of side airbags
The airbag system can provide supplemental
protection to properly restrained occupants.
Fig. 146 Side a irbag locatio n in the driver's seat
The side airbags are located in the sides of the
front seat backrests~
fig. 146 ..
The side airbags installed for the front seating
positions have been designed and certified to
help reduce the risk of injury that can be
caused by airbags when they inflate, particu -
larly when the occupant sitting next to it is .,..

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-Always read and heed all WARNINGS
whenever using a child restraint in ave­
hicle
¢ page 138, Safety belts,
¢ page 146, Airbag system and
¢ page 169, Important things to
know.
(D Tips
Always replace child restraints that were
installed in a vehicle during a crash. Dam­
age to a child restraint that is not visible
could cause it to fail in another collision
situation.
Advanced front airbag system and children
Your vehicle is equipped with a front "Ad­
vanced Airbag System" in compliance with United States Federal Motor Vehicle Safety
Standard (FMVSS) 208 as applicable at the
time your vehicle was manufactured .
The Advanced Airbag system in your vehicle
has been certified to meet the "low-risk" re­
quirements for 3-and 6-year old children on
the passenger side and small adults on the
driver side. The low risk deployment criteria
are intended to reduce the risk of injury
through interaction with the airbag that can
occur, for example, by being too close to the
steering wheel and instrument panel when
the airbag inflates . In addition, the system
has been certified to comply with the "sup­
pression" requirements of the Safety Stand­
ard, to turn off the front airbag for infants up
to 12 months who are restrained on the front passenger seat in child restraints that are list­
ed in the Standard .
Even though your vehicle is equipped with an
Advanced Airbag system, all children, espe­
cially those 12 years and younger, should al­
ways ride in the back seat properly restrained
for their age and size. The airbag on the pas­
senger side makes the front seat a potentially
dangerous place for a child to ride. The front
seat is not the safest place fo r a child in a for­
ward-facing child safety seat. It can be a very
Child Safety 1 71
dangerous place for an infant or a larger child
in a rearward-facing seat.
The vehicle's Advanced Airbag System has a
capacitive passenger detection system in the
front passenger seat cushion that can detect
the presence of a baby or a child in a child re­
straint system on this seat.
The capacitive passenger detection system
registers the changes that result in an electri ­
cal field when a child, a child restraint, and a
baby blanket are on the front passenger seat .
The change in the measured capacitance due
to the presence of a child, a child restraint,
and a baby blanket on the front passenger
seat is related to the child restraint system resting on the seat . The measured capacitance
of a child restraint system varies depending
on the type of system and specific make and model.
The electrical capacitance of the various
types, makes, and models of child restraints
specified by the U.S.National Highway Traffic
Safety Administration (NH TSA) in the relevant
safety standard are stored in the Advanced
Airbag System control unit together with the capacitances typical of infants and a 1-year
old child. When a child restraint is used on the
front passenger seat with a typical 1 year-old infant, the Advanced Airbag System compares
the capacitance measured by the capacitive passenger detection system with the data
stored in the electronic control unit.
Child restraints and Advanced front
airbag system
Regardless of the child restraint that you use,
make sure that it has been certified to meet
United States Federal Motor Vehicle Safety
Standards and has been certified by its manu­
facturer for use with an airbag. Always be sure
that the child restraint is properly installed at
one of the rear seating positions. If in excep­
tional circumstances you must use it on the
front passenger seat, ca refully read all of the
information on child safety and Advanced Air-
bags and heed all of the applicable ..,.
•
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•

188 Smart Technology
Smart Technology
Information about
data recorded by
vehicle control
modules
Your vehicle is not equipped with a crash data
recorder. This device is insta lled by some vehi­
cle manufacturers to record data about crash ­
es so tha t it can be analy zed later. Crash data
recorders are also called "Event Data Record­
ers (EDR)" .
In some legal jurisdictions, it is not permitted
to access or download data recorded by pre­
installed crash data recorders in order to eval­
uate a crash without clear consent of the vehi ­
cle owner .
Your veh icle is not equipped with a crash data
recorder. However it does contain a var iety of
e lectronic control modules for various vehicle
systems such as eng ine funct ion, exhaust
treatment or airbags and safety belts .
These electron ic control modules record vehi­
cle data during normal driv ing for diagnosis
and repair purposes. The recording capab ility
of the electron ic control modules is lim ited to
data only- no sound is reco rded.
If t he control
mo dule detects a sys tem m alfu nction or other
change in sta tus, a very lim ited amount of da­
ta is recorded for an extreme ly sma ll period of
time . Data t hat is recorded in s uch a case may
include veh icle speed, driving direction, the
load on the brakes and head restraints and
performance in the event of an acc iden t or
other change in status . The stored data can
only be read o r down loaded w ith specia l dev i­
ces.
Electronic stabilization
control (ESC)
Description
The E lectronic Stabilization Cont rol (ESC) con­
tr ibutes to d river safety. It reduces the risk of
slipp ing and improves driving stability. ESC detects critical situations such as the veh
icle
oversteering and understeering or the whee ls
are spinning . The vehicle is stabilized by ap­
plying the brakes or reducing engine torq ue.
Once the ESC is activated, the ind icator light
Bl blinks in the instrument cluster .
The following systems are integrated in the ESC:
Anti -lock braking s ystem (ABS)
ABS prevents the whee ls from locking when
braking . The vehicle can still be steered even
during hard braking . App ly steady pressure to
the brake peda l. Do not pump the peda l. A
puls ing in the brake peda l ind icates that the
system is act ing to stabilize the ve hicle.
Brake assi st sy st e m
The brake assist system can decrease braking
distance .
It increases braking power when the
driver presses the brake peda l quickly in emer­
gency s ituations. You m ust press and hold the
brake pedal until the dangerous situation is
over . In vehicles with adaptive cruise control*,
the brake assist system is more sens it ive if the
distance detected to the vehicle ahead is too
small.
Anti-slip regu lation (ASR )
ASR reduces engine power when the drive
wheels begin sp inning and adapts the force to
the road conditions. This makes it easier to
sta rt , accelerate and dr ive up inclines .
Electronic differenti al lock (EDL )
The EDL brakes whee ls that are spinning and
transfers the drive power to the other drive
wheel or wheels if the vehicle is equ ipped with
all wheel drive *). This function is not ava ilable
at h igher speeds .
In extreme cases, EDL automatically sw itches
off to keep t he b rake on the braked wheel
from overheat ing. The ve hicle is still working
co rrect ly. EDL w ill switch o n aga in automat i­
ca lly when cond itions have ret urned to no r-
mal. .,._

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Stee ring re comm endat ion
The ESC helps to stabilize the vehicle by
changing the steering torque.
Selective wheel torqu e control
Select ive wheel torque control is used when
driving on curves . The front wheel on the in­
side of the curve or both wheels on the inside
of the curve are braked selective ly as needed.
This a llows more precise driving in curves.
Automatic post -collisi on brakin g system
The "Automatic post-collision braking system "
can help to reduce the risk of slidi ng and of
other coll is ions afte r an accident. I f the airbag
con tro l modu le detects a collision above ace r­
tain vehicle speed, the vehicle is braked by the
ESC.
The vehicle does not brake automatically if:
- the driver presses the accelerator pedal, or
- the braking force generated by the pressed
brake pedal is greater than the braking force
that would be initiated by the system, or
- the ESC, the brake system or the vehicle
electrical system are not functioning.
A WARNING
-The ESC and its integrated systems can­
not overcome the limits posed by natura l
physical laws. This is especially impor ­
tant on s lippery or wet roads. If the sys-
Switching on/off
Sm art Te chnol og y 189
terns beg in acting to stabilize your vehi­
cle, you should immediately alter your
speed to match the road and traffic con­
ditions . Do not let the increased safety
provided tempt you into taking r isks .
This could increase your risk of a co lli­
SIOn.
- Please note the r isk of a coll is ion increas­
es when driving fast, especially through
curves and on slippery or wet roads, and
when dr iv ing too close to objects ahead.
The ESC and its integrated systems can ­
not a lways prevent collisions -there is
still a risk of accidents!
- Press the accelerator pedal caref ully
when acce lerating on even, slippery sur­
faces such as ice and snow. The drive
wheels can spin even when these control systems are installed and this can affect
driving stability and increase the r isk of a
coll is ion.
@ Tips
-ABS and ASR only function correctly
when all four wheels are equipped w ith
identical tires. Different t ire sizes can
lead to a reduct ion in engine power.
- You may hear noises when the systems
descr ibed are working.
- If the
Bl or [I] indicator light appears,
there may be a malfunction
¢ page 21.
ESC turns on automatically when you start the engine .
gi
Fig. 159 Upper c ente r conso le: ESC button
The ESC is designed to funct ion in levels . De­
pend ing on the level that is selected, the sta­
bilization funct ion of the ESC is lim ited or
swi tched off . The amoun t of stabilization con­
trol wi ll differ depending on the level.
In the follow ing unusual situations it may
make sense to switch the ESC sport mode on
to allow the wheels to sp in:
- Rocking the vehicle to free it when it is stuck
- Driving in deep snow or on loose ground
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Corrosion
Leaving the vehicle parked for long periods of
time, low mi leage and avoiding heavy braking
can contribute to corrosion on the brake ro­
tors and dirty brake pads.
If you usually avoid heavy braking or if there is
corrosion present, occasiona l heavy braking at
high speeds is recommended to clean the
brake rotors and pads~,& .
Brake system malfunction
if you notice that the brake pedal t ravel has
suddenly gotten larger, then a brake circuit
may have failed . Drive to you r authorized Audi
dealer or qualified repair facility immediately
to have the problem corrected. On the way
there, drive with reduced speed and keep in
mind that a long braking distance and in­
creased pressure on the brake pedal will be
necessary .
Low brake fluid level
When the brake fluid level is low, ma lfunc­
tions in the brake system may occur . The
brake fluid level is electronically monitored.
Brake booster
The brake booster amplifies the pressure you
apply to the brake pedal. It only works when
the eng ine is running.
A WARNING
-You should on ly perform braking maneu­
vers to clean the brakes when the road condit ions perm it . Never put others on
the road at risk -never forget the risk of
acc idents!
- On steep slopes, reduce the speed and
select a lower gear or lower selector lev­
er posi tion. Drive as little as possible
wh ile pressing the bra ke peda l and avoid
putt ing your left foot on the brake pedal
whi le driving. This could ca use the brakes
to overheat and impair the efficiency of
the brakes.
- Do not let the brakes "grind" by always
keeping yo ur foot on the brake peda l.
Smart Technolog y 191
This can cause the brakes to overheat in-,
crease wear and increase braking dis­
tance unnecessar ily.
- Certain weather and operating condi­
tions such as driving through water, driv­
ing in heavy rain or driving after washing
your veh icle can impa ir the effectiveness
of the brakes. In the winter, ice may
bui ld up on the brake pads, rotors and
drums . Check these components by brak­
ing caref ully. App lying the brakes care­
fu lly several times dries the brakes and
removes ice build-up .
- The effic iency of the brakes can also be
impaired by driving for long stretches on
roads covered with salt without using the
brakes. You can remove salt deposits
from the brake rotors and pads by care­
fully applying the brakes several times.
- If the front spoiler is damaged or you in­
stall another spoiler, make sure the front
wheel brakes are ventilated properly.
Otherwise, the brake system could over­ heat, wh ich reduces their effectiveness .
- Failure of a brake circuit impa irs braking
performance, wh ich increases braking
d istance . Avoid driving the vehicle and
have it towed it to the nearest author­
i z ed Audi dealer or authorized Audi Serv­
ice Facility.
- Do not let your veh icle roll w ith the en­
gine switched off under any circumstan­
ces .
- If the brak e booster is not working, you
wi ll have to press much harder on the
brake peda l to compensate for the lack
of the booster.
(D Note
-Never let the brakes "rub" by pressing
the pedal lightly when braking is not
really necessary. This causes the brakes
to overheat and increases braking dis­
tance and causes wear.
- Before driving on a long stretch with
steep s lopes, reduce your speed and shift
to the next lower gear This makes use of
the engine brak ing effect and relieves ..,.
•
•
•

192 Smart Technology
the brakes. If you need to brake addition­
ally, brake in intervals and not continu­
ously.
(D Tips
- If the brake booster is not working, you
must press the brake pedal with much
more force then norma l.
- If you retrofit your vehicle with a front
spoiler, wheel covers or similar items,
make sure that the air flow to the front
wheels is not interrupted. Otherwise the
brake system can become too hot.
Electromechanical
steering
The electromechanical steering supports the
driver's steering movements .
Power steering adapts electronically based on
the vehicle speed.
The vehicle still has full steering functionality if the power steering fai ls or when the engine
is stopped (towing). To steer, you must apply
much more force than usual.
Indicator lights and messages
• Do not drive vehicle: steering defective
If this indicator light turns on and stays on
and this message appears, the power steering may have failed.
Do
not continue driving. See an authorized
Audi dea ler or authorized Audi Service Facility
for assistance.
• Do not drive vehicle: steering defective
There is a malfunct ion in the electron ic steer­
ing lock. You cannot turn the ign ition on.
Do
not tow your vehicle because it cannot be
steered. See an authorized Aud i dealer or au­
thor ized Audi Serv ice Facility for ass istance.
'I j Steering malfunction: you can continue
driving
If the indicator light turns on, the steering
wheel may be more difficult to move or more sensitive than usual.
The stee ring wheel may
also be at an angle when driving straight.
Drive slowly to your authorized Audi dealer or
qualified wo rkshop to have the malf u nct ion
corrected.
II Steering lock : system fault! Please con­
tact Service
There is a malfunction in the electronic steer­
ing lock .
Drive to an authorized Audi dealer or author­
ized Audi Service Facility immediately to have
the malfunction corrected.
A WARNING ,___
Have the system malfunction corrected as
soon as possible by an authorized Aud i
dealer or authorized Audi Service Facility,
as this increases the risk o f an accident.
@ Tips
If the . or ,~ n ind icator light only stays
on for a short tim e, you may continue dr iv­
in g.
All wheel drive
(quattro)
Applies to vehicles: with all wheel drive
In all wheel drive, all four wheels are pow­
ered.
General information
In all whee l drive, the driving power is divided
between a ll four wheels . This happens auto­
matically depending on your driving behavior
as well as the current road conditions. Refer
to
¢ page 188, Electronic stabilization con­
trol (£SC) .
The all wheel drive concept is designed for
high engine power. Your vehicle is exception­
ally powerful and has excellent driving charac­
teristics both under normal driving cond itions
and on snow and ice . Always read and follow
safety p recaut ions
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Winter tires
By using all wheel drive, yo ur vehicle has good
forward motion with standard tires in winter
conditions. However, in winter we recommend
using winter or all season tir es on
all four
wheels, because this will imp rove the broking
effec t.
Snow chains
If there are snow chain laws, snow chains
must also be used on vehicles with a ll whee l
drive ¢
page 256, Snow chains .
Replacing tires
For vehicles w ith all wheel dr ive, only wheels
with the same rolling circumference should be
used . Avoid wheels with different tread
depths ¢
page 248.
Offroad vehicle?
Your Audi is not an offroad veh icle -there is
not enough ground clearance. For t his reason,
avoid difficult terrain. Refer to ¢
page 280.
.&_ WARNING -
-Also , in vehicles with all whee l drive,
adapt your driving style to the current
road and traff ic conditions. Do not let
the increased safety provided tempt you
into taking risks.
- The brak ing ability of your vehicle is lim­
ited to the traction of the wheels . In this
way, it is not different from a two wheel dr ive vehicle. Do not be tempted to ac­
celerate to a h igh speed when the road is
slippery th is increases the risk of an acci­
dent.
- Note that on wet streets, the front
wheels can "hydroplane" if driving at
speeds that are too high. Unlike front
wheel drive vehicles, the engine does not
rev higher suddenly when the vehicle be­
gins hydroplaning. For this reason, pay
attention to the road conditions regard­
less of your speed .
Smart Technolog y 193
Energy management
The starting ability is optimized
The energy management system manages
the electrical energy distribution and optimiz ­
es the availability of electrical energy for
starting the engine.
When a vehicle with a conventional energy
system is not driven for a long time , the bat­
tery is drained by equipment (for example the
immobilizer). In certain circumstances, there
could may no t be enough energy to start the
engine .
Your vehicle is equipped with an intelligent
energy management system for distr ibut ing
electric ity. This significantly improves the
starting ability and increases the battery life.
The energy management system Is made up
of
battery diagnosis , idling current manage­
ment
and dynamic energy management.
Battery diagnosis
The battery diagnosis determines the battery
charge level. The sensors determine the bat­
tery voltage, the battery current, and the bat­
tery temperature. The current charge leve l
and t he performance of the battery are deter­
mined based on this.
Idling current management
The idling current management decreases the
energy used while parked. With the engine
switched off, it manages the energy distribu­
tion to the different elect rical components.
Date from battery diagnosis is taken into ac ­
count for this.
Depend ing on the battery charge leve l, elec­
trical equip ment is switched off one item after
the other, to prevent the battery from drain­
ing and to retain the starting ability.
Dynamic energy management
While driv ing , dynamic energy management
distributes the appropriate amount of energy
to the e lectr ica l equipment . It controls the
battery charge level so that more energy is .,. •
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