2018 AUDI TT ROADSTER steering

Airbag system
Knee airbags
Description of knee airbags
The knee airbag system can provide supplemen­
tal protection to properly restrained front seat
occupants .
Fig. 165 Driver's k nee a irbag
The driver knee airbag is in the instrument panel
underneath the steering
wheel ¢ fig. 165, the
airbag for the passenger is at about the same
height in the instrument panel underneath the
glove compartment.
The knee airbag offers additional protection to
the driver's and passenger's knees and upper and
lower thigh areas and supplements the protec­
tion provided by the safety belts.
If the front airbags deploy, the knee airbags also
deploy in frontal collisions when the deployment
threshold stored in the control unit is met
¢ page 203, More important things to know
about front airbags.
In addition to their normal safety function, safe­
ty belts help keep the driver or front passenger in
posi tion in a frontal collision so that the airbags
can prov ide supplemental protection .
The airbag system is not a substitute for your safety belt. Rather, it is part of the overall occu­
pant restraint system in your vehicle. Always re­
member that the airbag system can only help to
protect you if you are wearing your safety belt
and wearing it properly . T his is why you should
always wear your safety belt, not just because
the law requires yo u to do so ¢
page 187, Gener­
al notes.
210
Remember too, airbags will deploy only once and
on ly in certain kinds of accidents -your safety
belts are always there to offer protection in those
accidents in which airbags are not supposed to
deploy or when they have already deployed, for
example when your vehicle strikes or is struck by
another after the first collision .
This is just one of the reasons why an airbag is
not a substitute for the safety belt . The airbag
system works most effectively when used with
the safety belts. Therefore, always wear your
safety belts correctly.
It is important to remember that while the sup­
plemental knee airbag system is designed to re­
duce the likelihood of serious injuries, other inju­
ries, for example, swelling, bruising and minor
abras ions and friction burns can also occur when
an airbag inflates.
The knee airbag system basically consists of:
-The electronic control module
-Two inflatable airbags (airbag and gas genera-
tor), one for the driver and one for the front
passenger
- The airbag warning light in the instrument clus-
ter
The knee airbag system will not deploy:
-when the ignition is switched off
- in frontal collisions when the decelerat ion
measured by the control unit is too low
-in side collisions
-in rear-end collisions
-in rollovers
-in the event of a system malfunction (warning/
ind icator light is on)
¢ page 14 .
.&, WARNING
-Safety belts and the airbag system can only
provide protection when occupants are in
the proper seating position
¢page 203 .
-If the airbag ind icator light ¢ page 14
comes when the vehicle is being used, have
the system inspected immediately by your
authorized Audi dealer.
It is possible that
the airbag will inflate when it is not sup ­
posed to, or will not inflate when it should.

Cl co .... N ,....
N .... 0 ,....
Vl co
How knee airbags work
The risk of injury to the leg area can be reduced
by fully inflated knee airbags.
Fig. 166 Inflated airbags protecting in a frontal collision
The knee airbag system has been designed so
that the airbags for the driver and front passen­
ger deploy in certain but not all frontal collisions.
If the front airbags deploy, the knee airbags also
deploy in frontal collisions when the deployment
threshold stored in the control unit is met.
When the system deploys, the airbags fill with a propellant gas, and inflate between the lower
part of the instrument panel and the driver and
the lower part of the instrument panel and the front
passenger ~ page 203, fig. 163.
Although they are not a soft pillow, they can
"cushion" the impact and in this way they can
help to reduce the risk of injury to the lower ex­
tremities.
All of this takes place in the blink of an eye, so
fast that many people don't even realize that the
airbags have deployed. The airbags also inflate
with a great deal of force and it is important for
occupant safety that nothing should be in their
way when they deploy .
Fully inflated airbags in combination with proper­
ly worn safety belts slow down and limit the oc­
cupant 's forward movement and help to reduce
the risk of injury.
Airbag system
Important safety instructions on the knee
airbag system
Airbags are only supplemental restraints . Always
wear safety belts correctly and ride in a proper
seating position .
There is a lot that you and your passenger must
know and do to help the safety belts and airbags
to provide supplemental protection.
_& WARNING
-
An inflating knee airbag can cause serious in-
jury. Wearing safety belts incorrectly and im­ proper 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 adjusting their
seat positions, it is important that both the
driver and the front passenger keep their
upper bodies and knees at the following minimum safe distances:
-at least 10 in (25 cm) between the chest
and the steering wheel/instrument panel.
-at least 4 in (10 cm) between the knees and the lower part of the instrument pan­
el.
-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 wear­
ing your safety belt. The risk increases even
more should the airbag deploy .
- Always make sure that the knee airbag can
inflate without interference. Objects be­
tween you and the airbag can increase the risk of injury in an accident by interfering
with the way the airbag deploys or 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 deploys, this
can result in serious or fatal injuries .
-Never carry objects of any kind in the foot­
well area in front of the driver's or pas­
senger's seat. Bulky objects (shopping bags, for example) can interfere with or
~
211

Child sa fety
Advanced front airbag system and children
Your veh icle is equipped w ith a front "Advanced
A irbag System" in comp liance w it h United States
F edera l Motor Vehicle Safety Standard ( FMVSS)
208, as well as Canada Motor Vehicle Safety
Standard (CMVSS) 208 as applicable at the time
your vehicle was manufactured.
The Advanced Airbag system in your veh icle 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 a irbag inflates. In addit ion, the
system has been certified to comply w ith the
" su ppress io n" req uirements of the Safety S tand­
ard, to tu rn 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.
E ven tho ugh yo ur vehicle is equipped with an
Ad a
vanced Airbag system, a chi ld should a lways ride
in the seat proper ly restrained for its age and
size. The airbag on the passenger side makes the
front seat a potentially dangerous p lace for a
child to r ide . The front seat is not the safest place
for a child in a forward-facing child safety seat .
It
can be a very dange rous place for a n infant or a
larger child in a rearward-fac ing seat.
The vehicle's Advanced Airbag System has a ca­
pac itive passenger detect ion system in the front
passenger seat cush ion that ca n detect the pres­
ence of a baby or a child in a ch ild restraint sys­
tem on t his seat .
The capac it ive passenger detect ion system regis ­
ters the changes that result in an electr ical field
when a c hild, a child restra int, and a baby blanket
a re on the front passenge r seat. The change in
t he meas ured capacitance due to t he p resence o f
a child, a chi ld restraint, and a baby b lanket on
the front passenger seat is re lated to the chi ld
restraint system resting on the seat . The meas ­
ured capacitance of a ch ild restraint system var-
218
ies depending on the type of system and specific
make and mode l.
The elect rical capac ita nce of the va rious types,
makes, and models of child restra in ts speci fied
by the U.S . National Highway Tra ffic Safety Ad­
ministration (NHTSA) in the relevant safety
standard are stored in the Advanced Airbag Sys ­
tem control unit together with the capacitances
typ ica l of infants and a 1-year old child. When a
c hi ld restraint is used on the front passenger
seat w it h a typical 1 year-old infant, t he Ad­
vanced Airbag System compares the capacitance measured by the capacitive passenge r detect ion
system wi th the data stored in the e lec tronic co n­
tro l unit .
Child restraints and Advanced front airbag
system
Regardless of the ch ild restraint that you use,
make sure that it has been certified to meet Safe­
ty Standards and has been cert ified by its manu ­
factu rer for use w ith an airbag . If in exceptional
c ir cumstances you m ust use it on the front pas­
senger seat, ca refully read all of the information
o n chi ld safety and Advanced Airbags and heed
a ll of th e app licab le WARNINGS . Make certain
that the chi ld and chi ld restraint are correctly
recognized by the capacitive passenger detection
system in the front passenger seat, that the front passenger a irbag is turned off, and that the air­
bag status is always correct ly signa led by the
PASSENGER AIR BAG OFF ~; light.
Many types and models of child restra ints 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 . Ch ild rest rai nts are not standa rdized .
Child res tra ints of the same type typically have
d iffe rent weights and sizes and diffe re nt "foot ­
pr ints", the size and shape o f th e bo ttom of the
ch ild restraint that sits on the seat, w hen they
are installed on a vehicle seat . These differences
make it virtua lly impossib le to certify comp liance
with the requirements for advanced a irbags w ith
each and every child restra int that has ever been
sold in the past or will be sold over the course of
the useful life of your veh icle .
.,.

0 a, .... N
Tire wear/damage
Fig. 188 Tire profile: treadwear indica­
tor
Tire wear
Check the tires regular ly for wear.
-Inflation pressure that is too low
or high can increase tire wear
considerably.
-Driving quickly through curves, rapid acceleration and heavy
braking increase tire wear.
-Have an authorized Audi dea ler
or authorized Audi Service Facili­
ty check the wheel alignment if
there is unusual wear.
-Have the wheels rebalanced if an imbalance is causing noticeable
vibration in the steering wheel.
If you do not, the tire s and other
vehicle components could wear more quickly.
~ l) Obey any applicable regulations in your 0
[;:; country. 00
Wheels
Treadwear indicator
Original equipment tires contain
treadwear indicators in the tread
pattern, which are bars that are 1/16 in (1.6 mm) high and are
spaced evenly around the tire per­ pendicular to the running direc­
tion
c:> fig. 188. The letters "TWI"
or triangles on the tire sidewall indicate the location of the tread­
wear indicators.
The tires have reached the mini ­
mum tread depth
l) when they
have worn down to the treadwear
indicators. Replace the tires with
new ones
c:> ..1,,. .
Tire rotation
Rotating the tires regularly is rec­
ommended to ensure the tires
wear evenly. To rotate the tires, install the tires from the rear axle
on the front axle and vice versa.
This w ill allow the tires to have
approximately the same length of
service life.
..,.
253

Wheels
store the pressure again in the Infotainment sys­
tem
i::> page 262 .
mm (Tir e Pr essure Monitoring System) Tire
pressure: malfunction! See owner's manual -
if
mm appears after switching on the ignition or
while driving and then the
[DJ indicator light in
the instrument cluster also starts to blink for
about one minute and then stays on permanen t­
ly, there is a system malfunction. Try to store the
correct tire pressures
<=:> page 262 . If the indica­
tor light does turn off or turns on again after a
short period of time, drive to an authorized Audi
dealer or authorized Aud i Serv ice Facility immedi­
ately to have the malfunction corrected .
_& WARNING
-If the tire pressure indicator appears in the
display, reduce your speed immediately and
avoid any hard steering or braking maneu­
vers. Stop as soon as possible and check the
tires and their pressure.
- The driver is responsible for maintaining the
correct tire pressures. You must check the
tire pressures regularly.
-Under certain conditions (such as a sporty
driving style, winter conditions or unpaved
roads), the pressure monitor indicator may
be delayed .
- Do not use run-flat tires on your vehicle. Us­
ing them when not permitted can lead to
vehicle damage or accidents .
(D Tips
- The tire pressure monitoring system can al­
so stop working when there is an ESC mal­
function.
- Using snow chains may result in a system
malfunction.
- The tires with the identification
"AO"
¢page 251 have been matched with your
Audi tire pressure monitoring system . Using
these tires is recommended.
262
Storing tire pressures
Applies to: vehicles with Tire P ressure Monitoring System in­
dicator
If the t ire pr essure chang es or a tire is replaced ,
it must be confirmed in the Infotainment sys­
tem.
.,. Make sure before storing that the tire pressures
of all four tires meet the specified values and
a re adapted to the load
<=:>page 253.
.,. Switch the ignition on.
.,. Select in the Infotainment system : the!M ENUI
button > Vehicle > left control button > Service
& checks> Tire pressure monitoring .
(D Tips
Do not store the tire pressures if snow chains
are installed .
Tire pressure monitoring
system
ill General notes
Each tire, including the spare (if provided),
should be checked monthly when cold and inflat­
ed to the inflation pressure recommended by the
vehicle manufacturer on the vehicle placard or
tire inflation pressure label. (If your vehicle has
tires of a different size than the size indicated on
the vehicle placard or tir e inflation pr essure la­
bel, you should determine the proper tire infla­
tion pressure for those tires).
As an added safety feature, your vehicle has been
equipped with a tire pressure monitoring system
( T PMS) that illuminates a low tire pressure tell­
tale when one or more of you r tires is significant­
ly under-inflated. Accordingly, when the low tire
pressure telltale illuminates, you should stop and
check your tires as soon as possible, and inflate
them to the proper pressure . Driving on a signifi­
cant ly under-inflated t ire causes the tire to over­
heat and can lead to tire failur e. Under-inflation
also reduces fuel efficiency and tire tread life,
and may affect the vehicle's handling and stop-
ping ability.
..,.

Wheels
Displaying tire pressures/temperatures
Applies to: vehicles with tire pressure monitoring system
Requirement: you must be d rivi ng the veh icle .
"'Se lect in the Infotainment system: IMENU I but­
ton
> Service & checks > Tire pre ssur e monitor­
ing > Di splay tire pressure.
- Green:
the current tire pressure and the speci­
fied t ire pressure are approximately the same .
-Yellow: the current tire pressure is too low
compared to the specified tire pressure .
The specified tire press ure is the last tire pres ­
sure that was stored
c> page 264.
Note that t he tire p ressure also de pends on the
temperature of the tire . The tire press ure in­
creases as the engine becomes wa rmer whi le
driving.
A WARNING
Read and follow the important information
and notes
c> page 263.
(D Tips
The tire pressure or temperature is not d is ­
played while the veh icle is stationary and in
adaptation mode. Dashes --.--are shown in
place of the pressu re and temperature.
(D Tire pressure loss
Applies to: vehicles with tire pressure monitoring system
-
If the Rt] indicato r light turns on, the p ressure in
at least one t ire is too low o r new sensors we re
not adapted :
[I] indicator lights turns on after turning the
ignition on
The tire pressure is too low compared to the
specified p ressure.
"' Check and store the t ire pressure(s) the next
time it is poss ible
c> page 264 .
[I] indicator light turns on while dri ving
Wheels with new sensors were not adapted or
the t ire pressure has reached a critical leve l com­
pared to the specified pressure .
264
"'Avoid unnecessary steering and brak ing maneu -
vers .
"'Adapt your dr iving sty le to the s ituation.
"' Stop as soon as possible and check the tire(s).
"'If it is possib le to continue driv ing, see an au-
thorized Audi dealer or authorized Aud i Service
Facility immediately and have your tire(s) re­
pa ired o r rep laced .
A WARNING
Read and fo llow the impo rtant info rmation
and n otes
c>page 263.
Storing new tire pressures
Applies to: vehicles with tire pressure monitoring system
Correctly stored tire pressure specifications are
necessary for reliable tire pressure monitoring.
-
It is always necessary to store the t ire pressures
whe n the t ire pressu res a re modified, fo r exam­
ple d ue to a change in load . o r when new senso rs
a re installed.
"' Before storing the t ire pressures, make su re the
tire pressures of all four t ires meet the spec i­
fied va lues and are adapted to t he load
c::> page 254, fig. 190 . Only correct and store
the pressure in tires whose temperature is ap ­
proximate ly the same as the ambient tempera ­
t u re . If the temperature of the tire is higher
than the ambient air temperature, the tire pressure must be increased approximately
3.0 PSI (0.2 bar) above the value on the st icker.
"' Switch the ignit ion on .
"'Select in the Infotainment system : IMENU! but­
ton
> Service & checks > Tire pressure monitor­
ing > Store tire pre ssure > Ye s, store now .
Af­
ter storing the t ire pressures, the t ire press ure
mon itor ing system measures the c urrent pres ­
sures while driving and stores them as the new
specified pressures .
"'If the changed tire pressures are not displayed
in the Infotainment system, drive the vehicle
for approximately 10 minutes so that the sen­ sor signa l from the wheels is received again .
During this adaptation phase, -- .- - is d isplayed
for the pressure and temperature and the tire pressure monitoring system is on ly partially

Fuses and bulbs
Fuses and bulbs
Electrical fuses
Replacing fuses
A fuse that has blown will have metal strips that
have burned through.
Fig. 20 5 Steering column area: cover
F ig. 20 6 Left side of the e ngine compartment: fuse cover
The individu al circuits are pro tec ted by safety
fuses. The fuses are located in the inter ior and in
the engine compartment .
Fuses in the interior
., Switch the ignition and all e lectr ica l equipment
off.
.. Check the following table to see which fuse be ­
l ongs to the
equipment ¢ page 281.
.. Remove the cover ¢ fig. 205.
.. Remove the plastic cl ip from the fuse panel
cover in the engine
compartment¢ fig. 206 .
.. Remove the fuse using the clamp.
., Replace the blow n fu se only with an identical
new one .
., Install the cover.
280
Fuses in the engine compartment
.. Switch the ignit io n and all electrical eq uipment
off .
.. Check the following table to see which fuse be­
longs to th e eq uipment
¢page 282.
.. Remove the fuse pane l cover c> fig . 206.
.. Remove the plastic clip from the fuse panel
cover ¢ fig. 206 .
., Remove the fuse us ing the clamp .
.. Replace the blown fuse on ly w ith an ident ical
new one.
Fuse color identification
Color Current rating
in amps
Black 1
Purple 3
Light brown 5
Brown 7.S
Red
10
Blue 15
Yellow 20
Wh ite or transparent 25
Green 30
Orange 40
A WARNING
D o not repair fuses and neve r rep lace a blown
f u se with one tha t has a hig her amp rat ing.
T his ca n ca use damage to the e lectr ica l sys­
tem and a fire .
(D Note
If a new fuse burns out again sho rtly after you
h ave insta lled it, have the e lectrical system
che cked as soon as possible by an au thori zed
A udi de aler or au tho riz ed Audi Service Fac ili­
ty .
0) Tips
- Th e followi ng t able does not list fuse loca­
t ions tha t are not used.
- Some of the e quipment listed in the fo llow­
ing tables applies on ly to certain mo del ver­
sions or certa in option al equipmen t.

Cl co .... N ,....
N ...... 0 ,....
Vl co
Interior fuse assignment
Fig. 207 Vehicle interior: fuse assignmen t
No. Equipment
Fl Power top cont
rol module (Roadster)
F2 Power top control module (Roadster)
F4 Central computer processor (MIB
-2)
FS Gateway
F6 Selector lever (automatic transmission)
Climate control system controls, rear w in-
F7 dow defogger relay coil, tire pressure
mon itoring
Switch for the electromechanical parking
F8 brake, light switch, rain/light sensor, inte-
rior lighting, anti -theft alarm system, di -
agnostic connector
F9 Steering column switch module
FlO Display
Fll All whee
l drive clutch
F12 Infotainment components
F13 Control module for suspension control
F14 Climate control system blowe r
FlS Electronic steering column
lock
F16 I
nfotainment system components, safety
be lt microphone (Roadster)
No.
Fl7
F1 8
Fl9
F20
F 22
F24
F 25
F 26
F 27
F28
F2 9
F 31
F3 2
F33
F 34
F 35
F36
F37
F3 8
F39
F40
F41
F 42
F43
F44
F45
F46
F49
F S3
Fuses and bulbs
Equipment
Instrument cluster
Rearview camera
Convenience access control module
Power lumbar support adjustment
Front passenger's side neck heating (Road-
ster)
R ight vehicle electrica l system control
module
Driver's s ide door (for example power w in-
dows)
Seat heating
Vehicle electrical system control module
AMI High media port
Vehicle e lectr ical system control module
Left vehicle electrical system contro l mod-
ule
Driver assistance systems
Airbag
Socket relay, inte rior sound , back-up light
switch, temperature sensor, oil leve l sen -
sor
Diagnosis, headlight range control system,
a ir quality sensor, automatic dimming
rearview mirror
R ight cornering light/ right LED-headlight
L eft cornering light/ left LED-headlight
Engine control module, ESC control mod-
ule
Front passenger's side door (for example
power windows)
C igarette lighter, sockets
SCR relay and delivery unit
Central locking area
On-board computer
A ll wheel d rive clutch control module
Power adjustable driver's side seat
Driver's side neck heating (Roadster)
Starter, clutch sensor
Rear window defogger
281