2011 AUDI A6 brake sensor

Ignition Lock malfunction ~
A malfunction in the ignition lock must be repaired imme­diately .
If the .Pe symbol in the display blinks, there is a malfunction
in the electronic ignition lock. An additional driver message
can also be displayed by pressing the
[CHECK ] button:
Ignition lock defecti ve . Contact wor kshop!
- Do not turn the engine off.
- Drive immediately to an authorized Audi dealer to have
the malfunct ion correc ted.
If the re is a malfunction in the e lectronic ignition lock, the ignit ion
cannot be turned
off . Drive immediately to an authori zed Audi dealer
to have the cause of the mal function corrected.
On vehicles with Convenience key* , the eng ine should not be switched
off using the [STOP] button because the engine cannot be started
again afte r the ign ition is switched off .•
Yellow symbols
Ayellow symbol means WARNING.
Controls and equip ­
ment Safety first
Fig.
18 Disp la y : lo w
f u el l evel warning
(p rio ri ty 2)
Dri ver information display
Yellow symbols ind icate a prior ity 2 malfunct ion - Warning!
When a yellow warning symbo l appears,
one warning tone sounds. A
dr iver message appears as well to expla in the malfunction in more
detail. The driver warning goes out after about 5 seconds, but it can
be brought up again a t any time by pressing the
I CHECK] button .
Check the displayed function as soon as possible . If
more than one
pr iori ty 2 malfunction is detected, all symbo ls will appear one after
the other for about 2 seconds.
Yellow symbols mean:
Convenience key*
=> page 112
Key not in vehicle
-
USA models : => page 21
Defective brake light
Canada models : => page 21
Defective brake light
Defective light bulb
=> page 21
L ig ht/rai n sensor defective :::>page 30
Windshield washer fluid =:>page 30
level low
Low fue l level
=:> page30
II Battery voltage => page 31
-
Worn brake pads => page 31
II Dynamic headlight range => page 31
control defective
-
Check engine oil leve l => page 31
=>page 283
...
Vehicle care Technical data

Driver information display
Engine oil sensor malfunction => page 31
._ --
Engine speed limitation* :::>page 32
-- -Adaptive Light* defective => page 32
Ignition lock malfunction =>page 32
--Windshield wiper defective => page 32
Tire pressure monitoring sys­
tem*
Loss of tire pressure
Tire pressure monitoring sys ­
tem*
System not available
Battery in remote control key
--
=> page 315
=> page 315
:::>page 39
Electromechanical => page 115
parking brake
Automatic transmission mal­
function
Ap plies to vehicles: w ith Conven ience key
Key not in vehicle
Key not in vehicle
=> page 151,
=> page 158
-
-
This reminder appears along with the...., symbol if the master key is
removed from the vehicle with the engine running. It is intended to
remind you (e.g. when changing drivers) not to continue the journey
without the master key.
If the master key is no longer in the vehicle, you cannot switch off the
ignition after stopping the engine and you also cannot start the
•
engine again . What is more, you cannot lock the vehicle from the
outside. •
Light/rain sensor defective )
Automatic headlights/automatic wipers defective
If the symbol illuminates, the light sensor has failed . For safety
reaso ns the low beams are turned on permanently with the switch in
AUTO. However, you can continue to turn the lights on and off using
the light switch. In the case of a defect in the rain sensor, the wind­
shield wiper lever functions are still available. Have the light/rain
sensor checked as soon as possible at a dealership. •
Windshield washer fluid level too low 5
, Please refill washer fluid
If the symbol illuminates, add windshield washer fluid to the washer
system and also to the headlight washer system=>
page 294. •
Fuel supply too low )
L Please refuel
When this symbol 1. illuminates for the first time, the fuel reserve in
your vehicles is still about 2 Gallons (7 to 9 liters). Refuel as soon as
possible =>
page 274.
If the symbol lights up, even when there is ample fuel in the tank, and
the text
Tank system malfunction! Contact workshop appears in the
display, there is a fault in the system . Contact a qualified workshop to
have the fault rectified.•

Battery voltage 1• i
If the battery's state of charge is not in the optima l range, the
symbo l is show n in the di splay and the d river me ssage
Low battery
charge: battery will be charged while dri ving
appears.
Whi le this d river notification is displayed, you have to be prepared for
limited starting capability .
Driver message appears and goes out again
If this driver message appears after the ignition is turned on or while
driving and it goes o ut again afte r a while, the ba ttery has been
adequate ly recharged.
Driver me ssage appears and does not go out again
If th is dr iver notification appears after the ignition is turned on or
wh ile driving and does not go ou t aga in, the battery 's state o f charge
is not in the opt imal range . Starting capability is restricted. Have the
bat tery checked by an au thor ized A udi dea le r as soon as possible. •
Worn brake pads U
._ Brake pads!
If the war ning lig ht ill um inates, immediately co ntact your au tho rized
Audi dea ler or qualified wor kshop to have all brake pads inspected.
On USA mode ls the warn ing light comes on together w it h the
warning light
BRAKE . Both sets of brake pads on an axle must a lways
be re placed at th e same time.
& WARNING
Driving with bad brakes can cause a collision and serious personal
injury .
Controls and equip ­
ment Safety first
Driver information display
& WARNING
(co ntinued )
• If the warning light... and the warning light BRAKE1l with the
mes sage Brake pads! comes on in the instrument cluster di splay,
immediately contact your authorized Audi dealer or qualified
workshop to have all brake pads checked or replaced if necessary. •
Headlight range control defective ((
~ ~ Headlight range control defective
If the symbo l illumina tes, the dynam ic he adlig ht r an ge con tro l is no
longer working properly. Have the system checked and repaired at
your Audi de aler. •
Engine oil Level~
Please che ck oil level
Whe n the symbol i llumina tes, check t he engine o il level as soo n as
poss ible => page 283 . Top off the oil at yo ur earlies t oppor tunity
=>page284 .•
Engine oil sensor defective _t..
Oi l level! sensor defective
If the symbo l illuminates, contact your author ized A udi dealer and
have the oi l senso r inspected. Un til you have t his don e, check the oil
level each time you refue l just to be on the safe side => page 283. •
ll BRAKE : USA mode ls only
Vehicle care Technical data

__________________________________________ A_ d_a""" p:....- t_iv _ e_ C_ r_ u _is _ e_C_ o_n_ t_ r_ o_ L_....J_
Adaptive Cruise Control
Speed and distance control system
App lies to veh icles: wi th Ad aptive Cruise Cont ro l
Descr iption
Th e Adaptive Cruis e Control driv er assistance pro gram is
a c omb in ed spe ed an d dista nce contr ol syst em .
Fig . 107 Front
bumper: Po sition of
radar sensor
Adaptive Cruise Control can help make driving more relaxed and less
t irin g, particular ly d uring long trips on inters tates or o ther highways
that are genera lly straight.
S et ACC to maintain a constant, legal travel speed between 20 and 95
mp h (3 0 -150 km/h) t hat is a pprop riate for prev ailing traffic co ndi­
tions. Select a following distance to the vehicle ahead and ACC w ill
adjus t you r speed t o mai ntain that dist an ce.
Adaptive Cruise Control has technical limitations that you must k now,
so p lease read this sectio n carefully, un de rstand how t he sys tem
wor ks and use it pro perly at all times.
How does it work?
You ca n operate the Adaptive Cruise Control using the lever on the
st eerin g wheel column=>
page 122, "H ow is the s peed stored ?" and
=>
page 125, " H ow is the distance (time inte rval) set?" .
Contro ls a nd e quip ­
m en t Vehicle
OP-eration
Driver information
Important information is bro ught up in the speedometer and in the
ins trumen t clus ter d is pla y as the ve hicle is be ing dr ive n=>
page 127,
"D river information" .
What is important for you to know
The Adaptive Cru ise Contro l is set with system-spec ified limits; that
is, as a driver, you will have to a djus t the s pee d and dis tan ce to t he
vehicle ahead in some in stances =>
page 130, "Driver intervention
promp t" and =>
page 131, "System lim itat ions".
ln. WARNING
Improper use of the Adaptive Cruise Control can cau se collisions,
other accidents and serious personal injury .
• Always remember that the Adaptive Cruise Contro l has limits -
it will not slow the vehicle down or maintain the set distance when
you drive towards an obstacle or something on or near the road
that is not mo ving, such as vehicles stopped in a traffic jam, a
stalled or disabled vehicle .
• Always remember that the Adaptive C rui se Control cannot
detect a vehicle that is driving towards you in your traffic lane and
that it cannot detect narrow vehicles such as motorcycles and bicy ­
cles .
• Never drive at speeds that are too fast for traffic , road and
weather conditions .
• The Adaptive Cruise Control cannot slow or brake the vehicle
safely when you follow another vehicle too closely . Always
remember that the Adaptive Cruise Control has a braking powe r
that is only about 30% of the vehicle 's maximum braking ability .
Always be prepared to b rake and ta ke e vasive action to a void colli-
sions and other accident situations . .,
Vehicle care Do-it-yourselt service iTechnical data

lffl!I.___A_ d_ a_,_ p_t _i_ v _e _ C_r_ u_ i_ s_ e_ C_ o_ n_ t_ r_ o_ l __________________________________________ _
& WARNING (conti nu ed )
• Never allow the closing speed between you and other vehicles
to be so high that the Adaptive Cruise Control may not b e able to
slow your vehicle safely.
If closing speed is too high , you must
appl y the brake s yourself to r educe the risk of a rear-end crash.
• Never re st your foot on the accelerator pedal , especially when
the Adaptive Crui se Control is being used . Pre ssure on the acceler ­
ator will o verride the ACC braking fun ction and prevent the brakes
from being applied when ACC detects a situation when the brakes
must be applied .
• Never use Adaptive Cruise Control when you cannot drive safely
at a steady speed, including on city streets , on winding roads or
when road conditions are poor (for example, on ice, gravel, in fog,
heavy rain or on wet roads that incre ase the risk of hydroplaning ).
• The radar sensor's
vision can be reduced by rain, snow and
heavy road spray. These and simila r conditions can p revent vehi­
cles up ahead from b eing accurately detect ed and in some cases
they may not be detected at all. Do not use ACC when the rad ar
sen sors cannot ac curately detect vehicle s moving ah ead of you in
traff ic.
• Alway s turn off Adaptive Cruise Control when ente ring turn
lanes, exit lanes and construction zones or in similar situations
becaus e the vehicle will automatic ally a ccelerate to the stored
speed when the road ahead is clear .
• To prevent unintended operation, always switch ACC off when
it is not being used.
[ i ) Tips
• For safety reasons, the stored speed is deleted when the ignition
is tu rned off.
• The Electronic Stabilization Program (ESP) and the Anti-Slip Regu­
la tion (ASR) cannot be dea ct iv a te d w he n t he A dapt ive Cruise Co ntr ol
is switched on. If the ESP and the Anti -S li p Reg ulation (ASR) has been deactivated and yo
u then sw itch on the Adapt ive Cr uise Contro l, th e
ES P fu nction w ill als o be a ct iv a te d a utom atically.
• Damage caused by accidents and some minor collisions can affect
t he rad ar sensor settings and c ause the system to malfunction o r
switch off completely .
• Th e radar s ensor cover is heate d. In w in ter cond itions, you sho uld
st ill check befo re dr iv ing to make sur e it is free of ice and snow. If
neces sary, cle an the area ne ar the r ad ar sensor carefull y::::>
page 119,
fig. 107 .
• T o ensure th at th e radar sensor i s not bl ocke d , fo reign obje cts
(e .g. stickers, larger license plate mounts, add-on parts) must not
cover the area near the r ada r senso r::::>
page 119, fig. 1 07. Th e area
near the radar sensor must not be painted, either.
• F or Decla ration o f Compli ance to Uni te d Stat es FCC and I ndustry
Canada regulations::::>
page 349. •
Applies to vehicles : w ith Adaptive Cruise Control
How does Adaptive Cruise Control work?
Vehicles trav eling ahead are det ect ed with the aid of a
radar sensor.
Fig . 108 Basic prin­
cipl e dia gram : Radar
s en sor me asurement
rang e
Adaptive Cr uise Cont rol uses a radar sensor in the fron t of t he vehicle
::::> fig. 108 . The system has limitations::::>
page 131. Things that are
no t moving in yo ur lane and in your dire ct io n of trave l will not be
~

_________________________________________ __;A~ d:.; a::..i.:: p..:t ..:..iv ..:....:: e_C.::..;.. r_u _i _ s _e _C_;__ o_n_ t_ r_ o_ l __ _
detected. The senso r measures the distance to reflective s urfaces
t h at m ust have a cert ain s ize. T he sys tem res ponds only aft er t he
dis tance measurement has been made.
If a measureme nt is not
poss ible, t he system cannot res pond and w ill not react to a vehicle o r
something else u p ahead.
Open road
When th e road is clear, t he Adaptive Cruise Con trol works like cru is e
co ntrol.
It m ainta in s a c onst ant ta rg et spee d sp ecif ie d by the dr ive r.
Driving in traffic
If a sl ower ve hicle dr iv ing ahead is detec ted, the A dap tive Cr uise
Control decele rates (within t he lim its of the system)=>
page 130,
"Driver interven tion promp t" and => page 131, "System lim itatio ns"
t o its speed and af ter adjus ting, tries to maintain the set d istance
from t he ve hicle ahe ad. Th e vehicle m ay temporari ly dr ive slower
t han the set s peed wh ile adjus ting=>
& in " Descr ipt io n" on
page 119 .
If th e vehicle in front acc ele ra tes, Ad aptive Cru ise Contr ol also a ccel­
erates up to the speed t hat you have set.
Situations requiring driver intervention
In some situat ions you will have to use the footbra ke to slow the
vehicle down in order to keep a sa fe distance from vehi cle in fro nt of
you or to avo id a rear -end co llision. I n this s ituation, a symbo l
a ppe ars and a war ning t one soun ds =>
page 13 0.
Passing another vehicle
If you move in to the passing lane and no ve hicle is detected ahea d,
the Adaptive Cruise Control accelerates to the speed you have set and
mai ntains it.
Overriding ACC
You ca n increase your spee d at a ny ti me by steppi ng on t he acceler­
ato r pedal. After you release the accelerator peda l, t he system
adju sts bac k dow n to the s peed yo u previously se t.
Controls and equip ­
ment Safety first
Reducing stopping distance
If the radar sensor de
tects tha t the dis tance to the vehi cle ahea d is
less than defined minim um distance, the brakes a re au toma tically
pre pare d fo r emer gency b rak ing by the driver . The brake pads are
moved very close to t he b rake discs wi thou t ac tually b rak ing t he
vehicle . This bra ke ass istant feature reacts more quickly to t he
dr iv er 's brak ing, and a lso wo rks wh en Ada ptiv e Cr uise Contro l is off .
T he stopping distance is reduced as a result of this advance b rak e
pre par at ion. Th is fu n ction does n ot p erform a ny eme rgency brak ing
maneuve rs by itself; t he d river must always app ly the brakes.
& WARNING
• Never rely on the distance control feature of ACC alone to
prevent rear-end collisions. Always be prepared to brake and take
evasive action to avoid collisions and other accident situations.
• Never allow the closing speed between you and other vehicles
to be so high that the Adaptive C ru ise Control m ay not be able to
slow your vehicle safely. If closing speed is too high, you must
apply the brakes yourself to reduce the risk of a rear-end crash.
[I) Tips
Please note that the amo unt o f acce leration the Ada ptive Cr uise
C on trol uses depe nds on t he Dist ance se tt ing se lec ted . DIS TA NCE 1
gives you accelerat io n that is dynamic and spo rty . DISTANCE 4, on the
o th er h an d , gives more mo derat e accelera tion. Fo r mo re info rm at ion
about the time intervals=>
page 125, "H ow is the distance (time
interva l) set ?".
• Please note that if the Adapt ive Cru ise Control has begun b raking
t he vehi cle and t he dr ive r ch oose s to brake the vehicle additi onally,
t he brakes may fe el "hard". Thi s is s imply due to the press ure build ­
up of the initia l bra king .
• Adaptive Cr uise Contro l is sw itched off afte r pressing the foot­
br ak e. Th e speed saved up this poin t ca n be resu med. T o resume the
saved speed, release t he brake pedal and p ull the control lever _.,
Vehicle care Technical data

ffl..__A_ d_a_ p,__ t_iv _ e_ C_r _u _ i_ s _e _ C_ o_ n_t _ r_ o _ L ___________________________________________ _
to the traffic situation is absolutely necessary. The following may be
reasons why the message
ACC functionality limited appears:
• The ACC sensor is dirty . The ACC system is not reacting, or is not
reacting correctly, to moving vehicles up ahead in your lane of travel.
• There may be very light traffic on and there is nothing that marks
the side of the road (for example, guard rails, traffic signs, trees) . As
soon as a moving vehicle up ahead is detected aga in, ACC becomes
active again and the message disappears.
Th e ACC sensor is located in the area under the front license plate.
If
the ACC sensor is dirty or blocked, clean the area to restore system
operat ion.
ACC not available
The text message ACC not available appears, for example, if the
temperature of the brakes is excessive. Adaptive Cruise Control is
temporarily not available. A warning tone sounds as a reminder.
ACC not available!
The text message ACC not available! appears in the event of a
malfunction. Adaptive Cruise Control is turned off. A warn ing tone
so unds as a reminder. Have the system inspected by a qualified deal­
ership.
ACC sensor blocked !
The text message ACC sensor blocked! appears when the ACC System
can no longer accurately detect vehicles moving up ahead in your lane
of travel. Adaptive Cruise Control is turned off. A warning tone also
so unds as a reminder.
To decide whether it is necessary to switch off the ACC (ACC sensor
blocked
!) or if it is only a temporary condition (ACC Functiona lly
limited), the system w ill also takes into consideration the outside
temperature and/or the windshield wiper operation .
Th e ACC sensor is dirty or blocked (e.g. leaves, snow) . The ACC sensor is located in the area under the front
license plate. If
the ACC sensor is dirty or bloc ked, clean the area to restore system
operation .
EPB activation
The text message EPB activation appears if emergency braking was
man ua lly initiated with the Electromechanical Parking Brake (EPB).
The Adaptive Cruise Control is turned off . Th is is accompanied by a
wa rning tone.
Speed
The set speed in mph (Canada km/h) always appears when saving or
changing the speed in Adaptive Cruise Control=:>
page 122, "How is
the speed stored?" and=:>
page 123, "Changing stored speed".
Selector lever position!
The text message Selector lever position! appears when the selecto r
lever is moved to position
N . In this position, Adaptive Cruise Control
is not available. •
Applies to vehicles: wit h Adapt ive Cruise Contro l
Driver intervention prompt
The driver intervention prompt calls on the driver to take
over the situation.
Fig. 118 I nstrument
cluster: Dr iver inter -
v ent ion prompt
~

Adaptive Cruise Control -
----------------
In certain situations, the braking power of the Adaptive Cruise
Control is not enough to maintain an adequate distance to the vehicle
up ahead. In these situations, the Adaptive Cruise Control calls the
driver to take action.
The
driver intervention prompt alerts you visually and audibly to take
over.
• A red vehicle is shown in the instru ment cluster display
=>
page 130, fig. 118.
• Th e text
DISTANCE! appears in the status line.
• The indicator light
c:::>uuc:::> in the speedometer blinks red.
• A warning tone sounds .
[I) Tips
• If the Adaptive cruise control initiates braking, the hydraulic brake
system is under pressure . Therefore, the brake pedal distance is
shorter and the pedal "feels" harder .
• Adaptive Cruise Control is switched
off after pressing the foot­
brake. The speed saved up this point can be resumed.
• To resume the saved speed, release the brake pedal and press the
control lever=>
page 124, "Turning Adaptive Cruise Control off
temporarily".
• If you use the accelerator to go faster than the speed of the
vehicle ahead of you, the
driver intervention prompt will not be
accompanied by a warn ing s ignal.
• If the speed you previously set is exceeded, the indicator light in
the speedometer will switch
off .•
Controls and equip ­
ment Safety first
A
pp lies to vehicles : w ith Ad apt ive Cr uise Cont rol
MMI settings
Individual settings for Adaptive Cruise Control can be
selected in the MMI.
Settings for the Driving program can be adjusted individually
to the particular user and saved in the MMI. This can only be
done with the engine running.
- Select: Function button
[CAR]> Systems*> adaptive
cruise control > Driving program .
Setting the driving program
In the Driving program menu you can adjust the character istics of
Adaptive Cruise Contro l to your own preferences using
Dynamic ,
Standard or Comfort.
Saving settings
Your individual settings are automatically saved and assigned to the
remote control key being used (remote key storage). If the key is
given to another person, the saved settings rema in as they are.•
System limitations
A pp lies to ve hicle s: with Ad apti ve Crui se Con tro l
General information
The radar sensor has limits that the driver must know to
be able to use ACC properly.
The Adaptive Cruise Control works within limits that are also related
to radar sensor range and sight distance. In some situations ACC may
reac t unusually or late from the driver's poin t of view . Therefore,
always be attentive to what is happen ing around you and a lways be
ready to intervene, if necessary:
• when driving around curves=>
page 132
Vehicle care Technical data