wheel AUDI S3 SEDAN 2015 Workshop Manual

M N
0 > co ,...., \!) ..,.,
..,.,
..,., ,....,
seat into its rearmost position in the seat's
fore and aft adjustment range, as far away
from the airbag as possible . The backrest
must be adjusted to an upright position .
Make sure that the
PASSENGER AIR BAG
OFF
light comes on and stays on all the time
whenever the ignition is switched on.
A WARNING
- If the PASSENGER AIR BAG OFF light does
not go out when an adult is sitting on the
front passenger seat after taking the steps
described above, make sure the adult is
properly seated and restrained at one of the
rear seating positions.
- Have the airbag system inspected by your
Audi dealer before transporting anyone on
the front passenger seat.
(D Tips
If the capacitive passenger detection system
determines that the front passenger seat is
empty, the frontal airbag on the passenger
side will be turned off, and the
PASSENGER
AIR BAG OFF light will stay on .
Repair, care and disposal of the airbags
Parts of the airbag system are installed at many
different places on your Audi . Installing, remov­
ing , 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 discarded
components do not cause injury or pollute the
environment.
A WARNING
-
Improper care, servicing and repair proce­
dures can increase the risk of personal injury
and death by preventing an airbag from de­
ploying when needed or deploying an airbag
unexpectedly:
Airbag system
-Never cover, obstruct, or change the steer­
ing wheel horn pad or airbag cover or the in­
strument panel or modify them in any way.
- Never attach any objects such as cup holders
or telephone mountings to the surfaces cov­
ering the airbag units.
- For cleaning the horn pad or instrument
panel, use only a soft, dry cloth or one mois­
tened 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 deploy and protect
properly.
- Never repair, adjust, or change any parts of
the airbag system.
-All work on the steering wheel, instrument
panel, front seats or electrical system (in­
cluding 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 au­
thorized Audi dealer or qualified workshop.
- 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 replacement upholstery over the front seatbacks that
have not been specifically approved by
Audi .
- Never use additional seat cushions that
cover the areas where the side airbags in­
flate.
- Damage to the original seat covers or to
the seam in the area of the side airbag
module must always be repaired immedi­
ately by an authorized Audi dealer.
- The airbag system can deploy only once. Af­
ter an airbag has been deployed, it must be
replaced with new replacement parts de­
signed and approved especially for your Audi model version. Replacement of complete
airbag systems or airbag components must be performed by qualified workshops only.
Make sure that any airbag service action is
163

Airb ag syst em
entered in your Audi Warranty & Mainte­
nance booklet under
AIRBAG REPLACEMENT
RECORD.
- For safety reasons in severe accidents, the
alternator and starter are separated from
the vehicle battery with a pyrotechnic circuit interrupter .
- Work on the pyrotechnic circ uit inter rupt­
er must only be performed by a qualified
technicians w ho have the experience, in­
formation and special tools necessary to perform the work safely.
- If the veh icle or the circuit interrupter is
scrapped, a ll applicable safety precautions
must be followed.
@ For the sake of the environment
Undep loyed airbag modu les and pretension ­
ers might be classified as Perchlorate Materia l
- specia l hand ling may apply, see
www.dtsc.ca.gov/hazardouswaste/perchlo­ rate. W hen the veh icle or parts of the re­
straint system including a irbag modules and
safety belts with prete nsioners are scrapped ,
all applicable laws and regulat ions must be
observed. Your authorized A udi dealer is fa­
m iliar with the se requirements a nd we recom­
mend that you have your dealer perform this
service for yo u.
Other things that can affect Advanced
Airbag performance
Changing the vehicle's suspension system ca n
change the way that the Advanced A irbag System
performs in a crash. For example, using t ire- rim
combinat ions not approved by Audi, lower ing the
ve hicl e, chang ing the stiffness of the suspension,
includ ing the spr ings, suspension s truts, shoc k
absorbers etc. can change the forces that are
measured by the a irbag sensors and sent to the
e lectronic control unit. Some suspension changes
can, for example, increase the force levels meas ­
ured by the sensors and make the a irbag system
deploy in c rashes in which it wou ld not deploy if
the changes had not been made. Other ki nds of
changes may reduce the force levels measured by
164
the sensors and p revent the airbag from dep loy ­
ing when it shou ld .
A WARNING
Changing the vehicle's suspension including
use of unapproved tire-rim combinations can
change Advanced Airbag performance and in­
crease the risk of serious personal injury in a
crash.
- Never install suspension components that
do not have the same performance charac­
ter istics as the components origina lly instal­
led on you r vehicle.
- Never use tire-rim combinations that have
not been approved by Audi.
Knee airbags
Description of knee airbag s
Applies to vehicles: with knee airbags
The knee airbag system can provide supplemen­
tal protection to properly restrained front seat
occupants .
Fig. 132 Driver 's knee a irbag
The driver knee airbag is i n the instrument panel
u nderneath the steer ing wheel ~
fig. 132 , the
airbag fo r the passenger is at abou t the same
height in the i nstr ument panel underneath the
glove comp artment.
The knee airbag offers additional protection to
the d river's and passenge r's kn ees and uppe r and
lower thigh areas and supplements the protec­
tion provided by the safety belts.
If the front a irbags deploy, the knee a irbags also
deploy in fronta l co llisions when the dep loyment
th reshold stored in the con trol un it is met
II>-

Child safety
Advanced front airbag system and children
Your vehicle is equipped with a front "Advanced
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" require­
ments for 3- and 6-year old children on the pas­
senger 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
"suppression " requirements of the Safety Stand­
ard, to turn off the front airbag for infants up to
12 months who are restrained on the front pas­
senger seat in child restraints that are listed in
the Standard.
Even though your vehicle is equipped with an Ad­
vanced Airbag system, all children, especially
those 12 years and younger, should always ride in
the back seat properly restrained for their age
and size. The airbag on the passenger side makes
the front seat a potentially dangerous place for a
child to ride. The front seat is not the safest place
for a child in a forward-facing child safety seat .
It
can be a very dangerous place for an infant or a
larger child in a rearward-facing seat .
The vehicle's Advanced Airbag System has a ca­
pacitive passenger detection system in the front
passenger seat cushion that can detect the pres­
ence of a baby or a child in a child restraint sys­
tem on this seat.
The capacitive passenger detection system regis ­
ters the changes that result in an electrical 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 re­
straint system resting on the seat. The measured
capacitance of a child restraint system varies de-
174 pending
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 Ad­
ministration (NHTSA) in the relevant safety
standard are stored in the Advanced Airbag Sys­
tem 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 Air­
bag 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 Unit­
ed States Federal Motor Vehicle Safety Standards
and has been certified 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, care­
fully read all of the information on child safety
and Advanced Airbags and heed all of the appli­ cable WARNINGS. Make certain that the child
and child restraint are correctly recognized by the
capacitive passenger detection system in 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 .
Many types and models of child restraints have
been available over the years, new models are in­
troduced regularly incorporating new and im­
proved designs and older models are taken out of
production. Child restraints are not standardized.
Child restraints of the same type typically have
different weights and sizes and different "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 impossible to certify compliance
with the requirements for advanced airbags with ..,.

Tires and wheels
Tires and wheels
Wheels
General information
~check your tires regularly for
damage (punctures, cuts, crac ks
and bulges). Remove foreign ob­
jects from the tire tread.
~ If driving over curbs or similar
obstacles, drive slowly and ap­
proach the curb at an angle.
~ Have faulty tires or rims re­
placed immediately.
~ Protect your tires from oil,
grease and fuel.
~ Mark tires before removing
them so that the same running direction can be maintained if
they are reinstalled.
~Lay tires flat when storing and
store them in a cool, dry location
with as little exposure to light as possible.
(D Note
-Please note that summer and winter tires are designed for
the conditions that are typical i n those seasons. Audi recom­
mends using winter tires dur­
i ng the winter months. Low
temperatures significantly de­ crease the elasticity of summ­
er tires, which affects traction
214
and braking ability. If summer
tires are used in very cold tem­ peratures, cracks can form on
the tread bars, resulting in
permanent tire damage that
can cause loud driving noise
and unbalanced tires.
-Burnished, polished or chromed rims must not be used in winter driving condi­
tions. The surface of the rims does not have sufficient corro­
sion protection for this and
could be permanently dam­
aged by road salt or similar
substances.
Tire designations
Fig. 168 Tire specification codes on the
sidewall of a tire .,_

M N
0 > co ,...., \!) 1.1'1
1.1'1
1.1'1
,....,
(D Tires for passenger vehicles
(if applicable)
P indicates a tire for a passenger
vehicle. T indicates a tire desig­ nated for temporary use.
@ Nominal width
Nominal width of the tire be­
tween the sidewalls in millime­
ters. In general: the larger the number, the wider the tire.
@ Aspect ratio
Height/width ratio expressed as a
percentage.
© Tire construction
R indicates a radial tire.
® Rim diameter
Size of the rim diameter in inches.
@ Load index and speed rating
The load index indicates the tire's
load-carrying capacity .
The speed rating indicates the maximum permitted speed
¢ A in
Winter tires on page
229.
"EXTRA LOAD", "xl" or "RF" indi­
cates that the tire is reinforced or
is an Extra Load tire.
Speed rat- Maximum permitted speed
ing
p
up to 93 mph (150 km/h)
Q up to 99 mph (160 km/h)
Tires and wheels
Speed rat- Maximum permitted speed
ing
R up to 106 mph (170 km/h)
s up to 110 mph (180 km/h)
T up to 118 mph (190 km/h)
u up to 124 mph (200 km/h)
H up to 130 mph (210 km/h)
V up to 149 mph (149.13 mi/h)al
z above 149 mph (240 km/h)3l
w up to 168 mph (167.77 mi/h)al
y up to 186 mph (186 .41 mi/h)a)
a) Tire manufacturers sometimes use "ZR"
for tires with a maximum speed above
149 mph (240 km/h).
(j) US DOT number (TIN) and
manufacture date
The manufacture date is listed on
the tire sidewall (it may only ap­
pear on the inner side of the tire):
DOT ... 2214 ...
means, for example, that the tire
was produced in the 22nd week of
the year 2014.
@ Audi Original equipment
tires
Audi Original equipment tires
with the designation "AO" or "RO"
have been specially matched to
your Audi. When used correctly,
these tires meet the highest standards of safety and handling.
An authorized Audi dealer or au­
thorized Audi Service Facility will
1111-
215

Tires and wheels
be happy to provide more infor­
mation .
® Mud and snow capabilit y
"M/S" or "M+S" indicates the tire
has characteristics that make it
suitab le for driving on mud and
snow.
& indicates a winter tire.
@ Compos ition of the tire cord
and materi als
The number of plies indicates the
number of rubberized fabric lay­
ers in the tire. In general : the
more laye rs, the more weight a
tire can carry. Tire manufacturers
must also specify the materials
used in the tire. These include
steel , nylon, polyester and other
materials.
@ Maximum permitted load
This number indicates the maxi ­
mum load in kilograms and
pounds that the tire can carry.
@ Uniform tire quality grade
standards for treadwear,
traction and temperature
resistance
Treadwear, traction and tempera­
ture ranges r:>
page 231.
@ Running direction
The arrows indicate the running
direction o f unidirectional tires .
216
You m ust always follow the speci­
fied runn ing direction
.:> page 245.
@ Maximum permitted
inflation pressure
This number indicates the maxi ­
mum pressure to which a tire can
be inflated under normal operat­
ing condit ions .
Glossary of tire and loading
terminology
Accessory weight
means the combined we ight (in
excess of those standard items
which may be replaced) of auto­
matic transmission, power stee r­
ing, power brakes , power win­
dows, power seats, radio, and heater, to the extent that these
items are available as fac to ry-in­
stalled equipment (w hether in ­
stalled or not).
Aspect ratio
means the ratio of the height to
the width of the tire in percent .
Numbers of 55 or lower ind icate a
low si dewall for imp roved steer­
ing response and better overa ll
handling on dry pavement . .,.

Tires and wheels
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight, and
(d) Production options weight
Ma ximum (permissible )
inflation pres su re
means the max imum cold infla­
tion pressure to which a tire may be inflated. Also called "maxi­
mum inflation pressure."
Normal occupant weight
means 150 lbs. (68 kilograms)
times the number of occupants
seated in the vehicle up to the to­
tal seating capacity of your vehi­
cle .
Occupant d istribution
means distribution of occupan ts
in a vehicle .
Outer diameter
means the overall diameter of an
inflated new tire.
Overall width
means the l inear distance be ­
tween the exteriors of the side­
walls of an infla ted tire, including
elevations due to labeling , deco­
rations, or protective bands or
ribs.
2 18
Ply
means a layer of rubber -coated
parallel cords.
Production options weight
means the comb ined weight of
those installed regular production
options weighing over 5 lbs. (2.3 kg) in excess of those standard
items which they rep lace, not pre ­
viously considered in cu rb weight
or accessory weight, including heavy duty brakes, ride levelers,
roof rack, heavy duty battery, and
special trim.
Radial ply tire
means a pneumatic tire in which
the ply co rds that extend to the
beads are laid at substantially 90
deg rees to the centerline of the
tread.
Recommended inflation
pressure
see ~ page 217 , Cold tire infla­
tion pressure.
Reinforced tire
means a tire designed to operate
at higher loads and at higher in­
flation pressures than the corre­ sponding standard tire. Rein ­
forced tires may be identified as

"XL" "xl" "EXTRA LOAD" or "RF" , , ,
on the sidewall.
Rim
means a metal support for a tire
or a tire and tube assembly upon
which the tire beads are seated.
Rim di ameter
means nominal diameter of the
bead seat. If you change your
wheel size, you will have to pur­
chase new tires to match the new rim diameter .
Rim size de signation
means rim diameter and width.
Rim width
means nominal distance between
rim flanges.
Side wall
means that portion of a tire be ­
tween the tread and bead.
Speed rating (letter code )
means the speed at which a t ire is
designed to be driven for extend ­
ed periods of time . The ratings
range from 93 mph ( 150 km/h)
to 186 mph (298 km/h)¢
table
on page 215.
You may not find
this information on all tires be­
cause it is not required by law .
Tires and wheels
The speed rating letter code,
where applicable, is molded on
the tire sidewall and indicates the
maximum permissible road
speeds
¢ .& in Winter tires on
page 229 .
Tire pressure mon itoring
system *
means a system that detects
when one or more of a vehicle's
tires are underinflated and illumi ­
nates a low tire pressure warning
telltale .
Tread
means that portion of a tire that
comes into contact with the road .
Tread separation
means pulling away of the tread
from the tire carcass .
Treadwear indicators (TWI )
means the projections w ithin the
principal grooves designed to give
a visual indication of the degrees of wear of the tread. See
¢ page 223, Treadwear indicator
for more information on measur­
ing tire wear .
219
...

Tires and wheels
Uniform Tire Qu ality Gr ading
is a tire information system devel ­
oped by the United States Nation­
al Highway Traffic Safety Adminis­
tration (NHTSA) that is designed
to help buyers make relative com­
parisons among tires. The UTQG is
not a safety rating and not a guar­
antee that a tire will last for a prescribed number of miles (kilo­
meters) or perform in a certain
way . It simply gives tire buyers
additional information to com­
bine with other considerations,
such as price, brand loyalty and
dealer recommendations . Under
UTQG, tires are graded by the tire manufacturers in three areas:
treadwear, traction, and tempera ­
ture resistance . The UTQG infor­
mation on the tires, molded into
the sidewalls.
U.S. DOT T ire Identification
Number (TIN )
This is the tire 's "serial number" .
It begins with the letters "DOT "
and indica tes that the tire meets
all federal standards . The next
two numbers or letters indicate
the plant where it was manufac­
tured, and the last four numbers represent the week and year of
manufacture. For example,
220
DOT ... 2214 ...
means that the tire was produced
in the 22nd week of 2014. The
other numbers are marketing co­
des that may or may not be used
by the tire manufacturer . This in­
formation is used to contact con­ sumers if a tire defect requires a recall.
Vehicle capacity we ight
means the rated cargo and lug­
gage load plus 150 lbs . (68 kilo­
grams) times the vehicle's desig­ nated seating capacity .
Vehicle maximum load on the
tire
means that load on an ind ividual
t ire that is determined by distrib ­
uting to each axle its sha re of the
maximum loaded vehic le weight
and dividing by two.
Vehicle normal load on the tire
means that load on an individual
tire that is determined by distrib­ uting to each axle its share of the
curb weight, accessory weight ,
and normal occupant weight (dis­
tributed in accordance with
¢ ta­
ble on page 226) and dividing by
two.
...

Occupant loading and distri­
bution for vehicle normal load
for various designated seating
capacities
Refer to the tire inflation pressure
labe l
c:::> page 224, fig. 171 for
the number of seating positions .
Refer to the table
c:::> table on
page 226
for the number of peo ­
ple that correspond to the vehicle
normal load.
New tires or wheels
Audi recommends having all work on tires or wheels performed by
an authorized Audi dea ler or au ­
thorized Audi Service Facility.
These facilities have the proper knowledge and are equ ipped with
the required tools and replace­
ment parts .
.,,. New tires do not yet have the
opt imum adhesion properties .
Drive carefully and at moderate
speeds for the first 350 m iles
(500 km) with new tires .
.,,. Use tires of the same construc­
tion, size (rolling circumference)
and as close to the same tread pattern as possible on all four
wheels .
Tires a nd whe els
.,,. Do not replace tires individually.
At least replace both tires on the same axle at the same time .
.,,. Audi recommends that you use
Audi Original equipment tires. If
you would like to use different
tires, please note that the tires
may perform different ly even if
they are the same size
c:::> ,& .
.,,. If you would like to equip your
vehicle with a tire/rim combina­
tion that is different from what
was installed at the factory, con­ sult with an authorized Audi
dealer or authorized Audi Service
Facility before making a pur­
chase
c:::> ..1,. .
The spare tire* is different from
the regular tires installed on the
vehicle -for example, if winter
tires or wide tires are installed -
then only use the spare tire* tem­
porarily in case of emergency and
drive carefully while it is in use. It
should be replaced with a regular
tire as soon as possible.
On
all wheel d riv e vehicles, all
four wheels must be equipped
with tires that are the same brand
and have the same construction
and tread pattern so that the drive system is not damaged by
22 1