2013 AUDI A8 brake sensor

Instrument s and warnin g/indic ator ligh ts 13
Yellow indi cator li ght s
Yellow symbols indica te a priority 2 ma lf u nc­
tion -Warning!
I
I
•
[I]
.,
•
•
U SA models: Safety systems
¢ page 18
Canada model s: Safety systems
¢page 18
Electronic Stabilization Contro l
(ESC) ../
¢ page 18
Electronic Stabilization Control
(ESC) ../
¢page18
USA model s:
Ant i- lock b rak ing system (ABS)
defective ¢page 19
Canada model s:
Anti-lock braking system (ABS)
defective
¢page 19
Worn brake pads ¢page 20
Electromechanical parking brake
¢page BS
Tire pressure mon itoring system
,/
¢ page267
Tire pressure monitoring system ¢page267
Electronic power contro l
¢ page20
Malfunction indicator Lamp (MIL)
,/
¢page20
Engine speed limitation
¢ page 20
Engine oil level
¢page 17
E ngine o il sensor
¢page 21
•
II
-
Ill
•
-Battery
¢page 16
Tank system ¢page 21
Windshield washer fluid level ¢page 21
Windshield wipers ¢page 21
-
Remote control key
¢page83
Remote control key
¢page 83
Battery in remote control key
¢page 31
Defective light bulb warn ing
¢page 21
Fog lights*
¢page 21
-
Rear fog lights*
¢page 21
Headlight range control
¢page 21
-adaptive light*
¢page 21
Light-/rain sensor faulty
¢page22
Audi lane assist *
¢page 102
Transmission ¢page 119
Transmission ¢ page 119
Electronic steering column lock
¢page 17
Engine start system
¢ page 17

Instrument s and warnin g/indic ator ligh ts 19
If the indicator light DJ and the ABS indicator
light
r.t.1:1:1 (USA models) 1 11] (Canada mod­
e ls) turn on and the message appears, there is
a ma lfunction in the ABS system or e lectronic
d ifferential lock. This also interrupts the ESC.
The brakes still function with their normal power, but ABS is not active.
Drive to your authorized Aud i dea ler immedi­
ately to have the malfunction corrected.
If the battery terminals were disconnected
and re -connected, the vehicle was jump start­
ed or the battery is very weak, the ESC sensor
system goes through a learning process for
the first few yards. The warning/ind icator
light illuminates. The warn ing/ indicator l ight
goes out as soon as the learning process is
comp lete.
For more informat ion about the ESC
c::>page 198.
ABS/(@) Anti-lock braking system (ABS)
This warning/indicator light monitors the ABS
and the electronic differential lock (EDL).
The warning/indicator light
E (USA mod­
els)
Ill] (Canada mode ls) will come on for a
few seconds when the ignition is switched on.
The light will go out after an automat ic check
sequence is completed .
There i s a malfunction in the ABS when:
-The warning/ ind icator light does not illumi­
nate when you switc h the ignition on.
- The warning/indicator light does not go out after a few seconds.
- The warning/indicator light illuminates
whi le driving.
The ESC indicator light also illuminates if
there is a malfunction in the ABS. The mes­
sage
Stabilizatio n control (ESC /ABS ) Fault !
See owne r's manual
also appears in the in­
strument cluster display and a warning tone
sounds .
The brake s ystem will still respond even
without the assistance of the ABS s ystem .
See your authori zed Audi dealer as soon as po
ssible to re store full br aki ng performance.
For more information regarding the ABS
c::> page 198 .
Malfunction in the brake system
If the brake war ning l igh t c::> page 14 and the
ABS warning illum inate together th ere may be
a mal function in the ABS, and there may a lso
be a malfunction i n the brake system itself
c::> .& . The ABS will not wo rk and you will no ­
tice a change in b raking response and per ­
formance .
In the event of a malfunction in the brake
s y stem
the warning/indicator light 1111
(USA mode ls)/ . (Canada models) in the in­
strument cluster flashes
c::> page 14.
Malfunction in th e electronic diff erential
lock (EDL)
The EDL works together w ith the ABS. The
ABS warning light will come on if there is a malfunction in the EDL system¢ page 198 .
See your author ized Audi dealer as soon as
poss ible .
.&_ WARNING
- If the r.t.1:1:1 (USA mode ls)/ [IJ (Canada
models) w arning light does not go ou t,
or if it comes on whi le dr iving, t he ABS
system is not wor king properly. The vehi­
cle can then be stopped only wit h the
standard brakes (without ABS). You w ill
not have the protect ion ABS prov ides.
Contact your Audi dea ler as soon as pos­
sible.
- USA models: If the
1111 warning light,
the:
JjJ warning light and the E warn­
ing light come on together, the rear
wheels could lock up f irst under hard
brak ing. Rear wheel lock-up can ca use
loss of vehicle control and an accident.
Have your vehi cle repaired immediately
by your authorized A udi dealer or a quali ­
fied workshop . Drive slow ly and avoid
sudden, hard brake applications.
- Canada models:
If the brake warning
light ., the
D] warning light and the
ABS warning light
[I] come on together, ~

Audi adapt ive crui se c ontrol an d bra kin g guard 9 3
Audi adaptive cruise
control and braking
guard
Introduction
App lies to vehicles: with Audi adaptive cruise control
The adaptive cruise control system assists the
driver by regu lating vehicle speed and helping
to maintain a set distance to the vehicle
ahead, within the limits of the system . If the
system detects a moving vehicle up ahead,
adaptive cruise control can brake and then ac­
celerate your vehicle. This helps to make driv­
ing more comfortable both on long highway
stretches and in stop-and-go traffic.
The braking guard system can warn you about
an impending collision and initiate braking
maneuvers ¢
page 99.
Adaptive cruise control and braking guard
have technical limitations that you must
know, so please read this section carefully, un­
derstand how the system works and use them
properly at all times.
General information
General information
Applies to vehicles: with Audi adaptive cruise control
Fig. 93 Front of the vehicle: sensors and video came ra
The areas that contain the radar and ultrason ­
ic sensors and the v ideo camera ¢
fig. 93
must neve r be covered by stickers or other ob­
jects or obstructed with dirt, insects, snow or
ice that will interfere with the adaptive cruise
control system and braking guard. For infor­
mation on cleaning, refer to ¢
page 218. The same applies for any modifications made in
the front area.
T he function of the adaptive cru ise contro l
system and braking guard is limited under
some conditions:
- Objects can on ly be detected when they are
w ith in sensor range
¢page 95, fig. 96 .
-The system has a limited ability to detect
objects that are a shor t distance ahead,
off
t o the side of your vehicle or moving into
your lane.
- Some kinds of ve hicles are hard to detect;
for examp le motorcycles, vehicles with high
ground clearance or overhanging loads may
be detected when it is too late or they may
not be detected at all.
- When driving through curves
¢page 94 .
- Stationary objects¢ page 94.
& WARNING
Always pay attent ion to traffic when adap ­
tive cruise control is switched on and brak­ ing g uard is active. As the driver, you are
still respons ible for starting and for ma in­
taining speed and distance to other ob­
jects . Braking guard is used to assist you .
The driver must always take action to avo id
a collision. The driver is always responsible
for braking at the co rrect time.
- Improper use of adaptive cru ise control
can cause collisions, other acc idents and
serious pe rsonal in jury.
- Never let the comfort and conven ience
that adaptive cruise control and braking
guard offer d istract you from the need to
be alert to traffic condit ions and the
need to rema in in full control of your ve­
hicle at all times,
- Always remember that the adaptive
cruise control and braking guard have
limits -they will not s low the vehicle
down or maintain the set distance when
you drive towards an obstacle or some­
thing on or near the road that is not
mov ing, such as vehicles stopped in a
traffic jam, a stalled or disabled vehicle .
I f registered by the radar sensors,

94 Audi adapti ve cruise control and bra king gu ard
vehicles or obstacles that are not moving
can trigger a collision warning and if con­
firmed by the v ideo camera, an acute col­
lis ion warn ing .
- For safety reasons, do not use adaptive
cruise co ntrol when driving on roads with
many curves, when the road surface is in
poor condit ion and/or in bad weather
(such as ice, fog, gravel, heavy rain and
hydroplan ing) . Using the system under
these cond it ions cou ld result in a co lli ­
sion .
- Swi tch adap tive c ruise control off tempo­
rar ily when driv ing in turning lanes, on
expressway exits or in construction
zones . This prevents the vehicle from ac­
celerat ing to the set speed when in these
situations.
- The adapt ive cruise control system wi ll
not brake by itse lf if you put your foot on
the accelerator pedal. Doing so can over­
ride the speed and d istance regulation .
- When approaching stationary objects such as stopped traff ic, adaptive cruise
co ntrol will not respond and braking
guard w ill have limited function.
- The adapt ive cruise control system and
braking guard do not react to people, an­
imals, objects c rossing the road or on­
coming objects .
- The function of the radar senso rs can be
affected by reflective objects such as
guard rai ls , the entrance to a tunnel,
heavy rain or ice.
- Never follow a ve hicle so closely that you
cannot stop your vehicle safe ly. The
adaptive cruise contro l canno t slow or
brake the vehicle safely when you follow
another vehicle too closely. Always re­
member that the automatic braking
function cannot br ing the vehicle to a
sudden or emergency stop under these condit ions.
- To prevent unintended operation, always switch ACC off when it is not being used. (D Note
The sensors can be displaced by impacts or
damage to the bumper, wheel housing and
underbody. That cou ld affect the adaptive
cruise control system and brak ing guard.
Have your authorized Aud i dea ler or au ­
thorized Audi Service Facility check their
funct ion .
In curves
Applies to vehicles: with Audi adaptive cru ise contro l
I
Fig. 9 4 Exampl e: dri ving in to a curve
When d riving into a curve c> fig. 94 and out of
a curve, the ad aptive cruise control may react
to a vehicle in the next lane and apply the
brakes. You can override or prevent the brak­
i ng by pressing the acce lerator pedal b riefly .
' Stationary objects
Applies to vehicles: with Audi adaptive cruise control
Fig. 95 Exampl e: objec t ch anging l anes and sta tio nar y
object
T he adaptive cru ise control system only reacts
to objects that a re mov ing o r that the system
has already detected as moving . For examp le,
if a vehicle @, which has already been detect-
ed by the adaptive c ruise contro l, tu rns or
ch anges lanes and another stationary vehicle .,.

Audi adaptive cruise control and braking guard 99
Audi braking guard
Description
Applies to vehicles: with Audi adaptive cruise control
Fig. 103 Instrumen t cl uste r: ap proac h warn ing
Braking guard uses radar sensors and a video
camera . It a lso functions within the lim its of
the system whe n adapt ive cruise control is
switched off .
What can braking guard do? When detected in time, the system can assess
situations when a vehicle ahead brakes sud­
denly or if y our own veh icle is traveling at a
high speed and approaching a veh icle up
ahead that is moving more slowly . Bra king
g ua rd does not react if i t cannot detect th e
si tuation.
The system advises you of va rious situations:
- The distance warning is given if you are too
close to the vehicle ahead for a long time. If
the vehicle ahead brakes sharply, you will not be able to avoid a col lisio n. The indicator
light
I i n the display comes on .
- The approach warning is g iven when a de­
tected vehicle up ahead in yo ur lane is mov ­
i ng much more slowly tha n you are o r if it
b rakes sha rply . When this wa rning is given,
i t may only be possib le to av oid a collision
by swerving or br aking sh arply . Th e ind ic a tor
li gh t
I and indicator in the disp lay will warn
yo u about the danger
c::> fig . 103 . You will al­
so hear an acoustic sig na l.
If yo u do not re act fast enoug h or do not re act
at all to the situat io n, braking g uard will inte r-
11
Thi s is not ava ilable in som e coun tri es.
vene by braking and the message braking
guard intervention will appea r.
- If a coll is ion is im minen t, the sy st em w ill
first provi de an acute warning by brie fly and
shar ply a pplying the brakes.
- If you do not re act t o the acu te war ning,
bra king g uard can brake w ith increas ing
force w ith in the lim its of the system. T his
red uces the vehicle speed in the event of a
co llision.
- The system can initiate maximum brak ing
short ly before a co llision
ll. Full dece leration
at high speeds occurs only in vehicles with
adapt ive cr uise control and side assist (pre
sense plus).
- If the brak ing g uard senses that yo u are not
braki ng hard enough w hen a co llision is im­
m inent, it can inc rease t he b ra ki ng fo rce .
- The pre sense functions also engage whe n a
col lision is imm inent
c::> page 196 .
Which function s can be controlled?
You can switc h braking guard an d the dis ­
tance/approach warning on or off in the M MI
c::> page 100, Settings in the MMI.
&_ WARNING
Lack of attent ion can cause collisions, ot h­
e r accidents and serio us pe rsonal inj uries .
Th e braking gua rd is an assist system and
ca nnot pr ev en t a collisi on by its elf . T he
dr iver must always in tervene. The drive r is
al way s res pons ible f or br aki ng a t the cor­
rect t ime.
- Always pay clos e att ention to traffic ,
e v e n w hen the bra king g uard is swi tched
on. Be ready t o intervene and be ready to
take comp lete contro l whenever necessa­
ry. Always keep the sa fe and legal dis ­
tanc e between your ve hicle an d veh icles
up ahead.
- Braking guard works wi thin limits and
wi ll not respo nd outside t he system lim­
its, for e xamp le w hen approaching a
stopped vehicle o r stationary obstacle ..,.

100 Audi adaptive cruise control and braking guard
(end of a traffic jam or vehicle that has
broken down in traffic).
- Always remember that the radar sensor
for the braking guard works only within
defined detection and range limits that
may prevent the proper detection of oth­
er vehicles.
- The radar sensor's function and range
can be reduced by rain, snow and heavy
spray. Moving vehicles up ahead may not
be promptly detected or may not be de­
tected at all.
- Reflective surfaces including crash barri­
ers or tunnel entrances may impair the
function of the radar sensor.
(D Tips
- You can cancel the braking with increas­
ing force that is initiated by the system
by braking yourself, by accelerating no­
ticeably or by swerving.
- Braking guard error messages
r::> page 100.
-Keep in mind that braking guard can
brake unexpectedly . Always secure any
cargo or objects that you are transport­
ing to reduce the risk of damage or in­
jury.
Settings in the MMI
Applies to vehicles: with Audi adaptive cruise control
• Select: ICARI function button > Car systems
control button > Driver assist > Audi brak­
ing guard.
System -
Switch braking guard On and Off.
When you switch the ignition on, the message
Audi braking guard off appears if the system
is switched off.
Early warning -The distance and approach
warnings in the display can be switched
On/
Off.
Tips
- Your settings are automatically stored
and assigned to the remote control key being used at the time the settings are
made.
- If you switch the ESC to sport mode,
braking guard switches off automatically
~page 200.
- Switch braking guard off when you are
loading the vehicle onto a vehicle carrier,
train, ship or other type of transporta­
tion. This can prevent undesired warn­
ings from the braking guard system.
Messages
Applies to vehicles: with Aud i adapt ive cru ise contro l
ACC unavailable
ACC and braking guard: unavailable
The system cannot detect moving vehicles up
ahead correctly and is switched off. The sen­
sors have been displaced or are not working
properly. The Audi pre sense functions may al­
so be affected. Drive to your authorized Audi
dealer or authorized Audi service facility im­
mediately to have the malfunction corrected.
ACC: unavailable at this time. No sensor vi­
sion
ACC and braking guide: unavailable at this
time. No sensor vision
This message appears if the sensor view is ob­ structed, for example by leaves, snow, heavy
spray or dirt . Clean the sensors
r:> page 93,
fig. 93.
ACC: unavailable at this time. Incline too
steep
The road exceeds the maximum possible an­
gle for proper adaptive cruise control opera­
tion. Adaptive cruise control is switched off .
ACC: only selector lever positions D, S or M
available
Select the D, Sor M selector lever position.
ACC: unavailable at this time. Parking brake
set
The adaptive cruise control system switches
off automatically if the parking brake is set. .,.

280 Fuses and bulbs
Fuse panel @ (brown)
No. Equipment
1 Headlight control switch
2 Emergency start coil (key
identification)
3 Rear door
control module
(driver's side)
5 Horn
6 Interior lights
(headliner)
Steering column lever, mul-
8
tifunction steering wheel
controls, steering wheel
I heating
10 Power steering column ad-
justment
11 Driver door control module
12 Diagnost
ic connector, light/
rain sensor
14 Power steering column ad-
justment
15 Power
steering, A/C com-
pressor
16 Brake booster
Fuse panel © (black)
No. Equipment
1 Front seat heating
2 Windshield wiper
3 Front exterior lighting
4 Sun roof
5 Driver power window
6 Driver seat (pneumatic)
7 Panoramic
sunroof
8 Dynamic steering
9 Front exterior lighting
10 Windshield/headlight
wash-
er system
11 Rear power window (driver's
side)
Panoramic sunroof
Amps
5
5
7,5 15
7,5
10/5
5
7,5 10
25
20 15
Amps
30
30
30 20
30
7,5
20
35
30
35
30
40
Front passenger side cockpit fuse
assignment
Fig. 227 Front passe nger side cockpit: fuse pane l with
plastic bracket
Fuse panel ® (black)
No. Equipment Amps
1 Anti-theft alarm system
5
2 T
ransmission control mod-
15
ule
3 Front climate control fan 40
4 Engine supply 35
6 Engine
control module
5
7 Front passenger door con-
7,5
trol module
8 Front passenger
power win-
30
dow
9 ESC control module 10
10 E5C control modu le 25
11 Right rear power window
30
12 Front passenger
seat (pneu-
7,5
matics)

Fuse s and bulb s 281
Luggage compartment fuse assignment
Fig. 228 Luggage compartment: fuse pa nel with plastic bracket
Fuse panel @ (black ) Fuse panel @ (b la ck)
No . Equi pment Amps No. Equipment Amps
[ru button, data logger, diag-
11 Dynamic
steering
5
l nostic
connector, BCM -1,
5
Selector lever, BCM-2 5
adaptive light ing system
Audi side assist
5
2 Networking gateway 5
Engine control module 5
3 adaptive air suspension
5
Starter 40
4 Parking system 5
Left headlight/Headlight
16 10/5
5 Steer
ing column lever
5
range control system
6 Suspension control system
5 Fuse panel
@ (red ) sensor
Belt tensioners, airbag con-
No. Equipment Amps
7 trol module 5
l Left
reversible be lt tens ione r 25
Heated washer fluid nozzles, 2
Right reversible belt ten-
25
Homelink (garage door sioner
8 opener), night vision system 5 Starter diagnos
is, DC/DC
control module, sport differ-3 c onverter (Start-Stop-Sys-5
ential, ioni zer tern )
9
Electromechan ica l parking
5 4 DC/DC converter 7,5
brake contro l modu le 5 Image pro cessing 7 ,5 -
10
Rear seat heating, cooler, in-
5
terior rearview mirror