2008 AUDI S6 brake sensor

& WARNING
Your vehicle must not be towed in the event of a malfunction in the electronic steering column lock because it cannot be steered due
to the locked steering . If it is towed with the steering locked, there
is the risk of an accident. •
Ignition lock malfunction ~
A malfunction in the ignition lock must be repaired imme­
diately.
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 defective. Contact workshop!
-Do not turn the engine off.
- Drive immediately to an authorized Audi dealer to have
the malfunction corrected.
If there is a malfunction in the electronic ignition lock, the ignition
cannot be turned off. Drive immediately to an authorized Audi
dealer to have the cause of the malfunction corrected.
On vehicles wi th Advanced Key *, the engine should not be switched
off using the
I STOP I button because the engine cannot be started
again after the ignition is switched off .•
Controls and equip ­
ment
Driver information display
Yellow symbols
A yellow symbol means WARNING.
Fig. 19 Display: low
fuel level warning
(priority 2)
Yellow symbols indicate a priority 2 malfunction -Warning!
When a yellow warning symbol appears , one warn ing tone sounds.
A driver message appears as well to explain the malfunction in more
detail. The driver warning goes out after about 5 s econds, but it can
be brought up again at any time by pressing the I CHECK I button.
Check the displayed function as soon as possible . If more than one
priority 2 malfunction is detected, all symbols will appear one after
the other for about 2 seconds .
Y ellow symbols mean :
Advanced Key* Key not in vehicle
l[usA models:
Defective brake light
Canada models:
Defective brake light
]f Defective light bulb
Light/rain sensor defective
I • •
~ page 128
~ page27
-
~ page27
~ page27
-
~ page36

Driver inf ormati on displ ay
Windshield washer fluid
leve l low
...
Low fue l level
-Battery voltage
Worn brake pads
-
Dynamic headlight range
control defective
Check engine oil level
=> page 301
Engine oil sensor malfunction
-
Adaptive Light* defective
-
Ignition lock malfunction
Windshie ld wiper defective
Tire pressure monitoring sys-
tern Loss of air pressure
Tire pressure monitoring sys -
tern
System not available
Ba ttery in remote control key
Electromechan ical
parking brake
=> page 36
=> page 36
-
=> page 37
=> page 37
-
=> page 37
=> page 37
=> page 37
=> page 37
-
=> page 38
=> page 38
=> page 44
:::::, page 46
=> page 49
:::::, page 131
•
Appl ies to vehic les: with Advanced Key
Key not in vehicle
,:, Key not in vehi cle
T his reminder appears a long with the -symbol if the master key is
removed from the vehic le 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 veh ic le, 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 )
c Automatic hea dlight s/aut oma tic w iper s def ective
If the symbo l il luminates, the light sensor has failed. For safety
reasons 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
windshield wiper lever functions are still available. Have the
l ight/rain sensor checked as soon as possib le at a dealersh ip .•
Windshield washer fluid level too low
.5 Pl eas e top up w asher fl uid
If the symbol illuminates, add windshield washer fluid to the washer
system and also to the headlight washer system:::::,
page 312. •
Fuel supply too low L)
Please refuel

When this symbol 5' 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 292.
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 work ­
shop to have the fault rectified .•
Battery voltage LJ
If battery power drops below a specified level, idling current
management starts by switching off electrical loads. The driver
message
Power-saving mode activated is shown in the display.
If the battery's state of charge is not in the optimal range, the
U
symbol is shown in the display and the driver message Low battery
charge: battery will be charged while driving
appears .
While this driver 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 out again after a while, the battery has
been adequately recharged.
Driver message appears and does not go out again
If this driver notification appears after the ignition is turned on or
while driving and does not go out again, the battery's state of
charge is not in the optimal range. Starting capability is restricted.
Have the battery checked by an authorized Audi dealer as soon as
possible. •
Worn brake pads ... 1
C Brake pads!
Controls and equip ­
ment
Driver information display
If the symbol illuminates, contact your authorized Audi dealer to
have the front brake pads inspected (on that occasion have the rear
brakes inspected as well to be safel. •
Headlight range control defective
, Headlight range control defective
If the symbol illuminates, the dynamic headlight range control is no
longer working properly . Have the system checked and repaired at
your Audi dealer. •
Engine oil level r.
' Please check oil level
When the symbol illuminates, check the engine oil level as soon as
possible ~
page 301. Top off the oil at your earliest opportunity
~ page 302. •
Engine oil sensor defective ~1 .•
~ Oil level! sensor defective
If the symbol illuminates, contact your authorized Audi dealer and
have the oil sensor inspected. Until you have this done, check the oil
level each time you refuel just to be on the safe side~
page 301. •
Applies to veh ic les: w ith Adaptiv e Lig ht
Adaptive Light defective 1
' Adaptive Light defective
When this symbol .... illuminates, it means that Adaptive Light is
defective. Go to an authorized dealership to have the headlights or
the control unit for the Adaptive Light repaired.•
I • •

__________________________________________ ...;A::::::..:: d::..: a~ p~t :..:iv ::_:e:::._: C~ ru~ is~e::....:: C:::.: o~ n:.!t :.'...ro ~ I _ _Jl'II
Adaptive Cruise Control
Speed and distance control system
Applies to vehic les : with Adaptive C ruise Cont rol
Description
The Adaptive Cruise Control driver assistance program is
a combined speed and distance control system.
Fig. 129 Front
bumper: Position of
radar sensor
Any speed between about 20 mph (30 km/h) and about 95 mph
(150 km/h) can be set and he ld with the Adaptive Cruise Con trol. The
system also regulates a pre-set distance from the vehicle ahead
within the limits of the system described.
Driving can be more relaxed, particularly on long trips on interstates
or on other highways that are generally straight.
How does it work?
You can operate the Adaptive Cruise Control using the lever on the
steering wheel column::::> page 137, "How is the speed stored?" and
=> page 140, "How is the distance (time interval) set?".
Con tro ls and eq uip­
ment
Driver information
Important information is brought up in the speedometer and in the
instrument cluster display as the vehicle is being driven
=> page 142, "Driver information" .
What is important for you to know
The Adaptive Cruise Control is set with system -specified limits, that
is, as a driver, you will have to adjust the speed and distance to the
vehic le ahead in some instances=> page 146, "Driver intervention
prompt" and=> page 147, "System limita tions".
& WARNING
Improper use of the Adaptive Cruise Control can cause collisions,
other accidents and serious personal injury .
• Never drive at speeds that are too high for traffic , road and
weather conditions.
• Never follow the vehicle in front so closely that you cannot stop
your vehicle safely. The Adaptive Cruise Control cannot brake the
vehicle safely when you follow another vehicle too closely. Always
remember that the Adaptive Cruise Control has a braking power
that is only about 25% of the vehicle's maximum braking ability,
the automatic braking function cannot bring the vehicle to a stop.
• Never use Adaptive Cruise Control on roads where you cannot
drive safely at a steady speed, including city, stop-and-go or heavy
traffic, on winding roads or when road conditions are poor (for
example, on ice, gravel , in fog , heavy rain or on wet roads that
increase the risk of hydroplaning).
• The radar sensor's
vision can be reduced by rain, snow and
heavy spray. This can result in vehicles driving ahead being inade ­
quately detected or, in some circumstances, not detected at all. If
necessary , take action yourself! ._
Vehicle care I I irechnical data

• .___A_ d_ a_ p =- t_iv _ e _ C_ r_u _is_ e_ C _ o_ n_ t _r _o_ l --------------------------------------------
& WARNING (continued)
• Always turn off Adaptive Cruise Control when entering turn
lanes, highway exit lanes and construction zones or similar situa ­
tions because the vehicle will automatically accelerate to the
stored speed.
• Never rest your foot on the accelerator pedal, especially when
the Adaptive Cruise Control is being used because doing so will
override the braking function and prevent the brakes from being
applied by the system when it detects a situation when the brakes
must be applied.
• Always remember that the Adaptive Cruise Control has limits -
it does not react when you drive towards an obstacle or some­
thing else on or near the road that is not moving, such as vehicles stopped in a traffic jam, a stalled or disabled vehicle .
• Always remember that the Adaptive Cruise 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
bicycles .
[ i) Tips
• For safety reasons, the stored speed is deleted when the ignition
is turned off.
• The Electronic Stabilization Program (ESP) and the Anti -Slip
Regulation (ASRl cannot be deactivated when the Adaptive Cruise
Control is switched on. If the ESP and the Anti -Slip Regulation (ASRl
has been deactivated and you then switch on the Adaptive Cruise
Control, the ESP function will also be activated automatically.
• Damage caused by accidents (e.g. if the vehicle is damaged
when parking) can affect the radar sensor settings. This can cause
the system to malfunction or switch off completely.
• The radar sensor cover is heated. In winter conditions, you
should still check before driving to make sure it is free of ice and
snow. If necessary, clean the area near the radar sensor carefully
=>
page 135, fig. 129. • To
ensure that the radar sensor is not blocked, foreign objects
(e.g. stickers, larger license plate mounts, add -on parts) must not
cover the area near the radar sensor=>
page 135, fig. 129. The area
near the radar sensor must not be painted, either. •
Applies to veh ic les: with Adaptive Cruis e Contro l
How does Adaptive Cruise Control work?
Vehicles traveling ahead are detected with the aid of a
radar sensor.
Fig. 130 Radar sensor
measurement range
A radar sensor is built into the front of the vehicle=> fig. 130. The
system is intended to measure the distance to reflective surfaces. If
a measurement is not possible, the system does not respond.
Open road
When the road is clear, the Adaptive Cruise Control works like cruise
control. It maintains a constant target speed specified by the driver.
Driving in traffic
If a vehicle driving ahead is detected, the Adaptive Cruise Control
decelerates (within the limits of the system)=>
page 146, "Driver
intervention prompt" and=>
page 147, "System limitations" to its
speed and after adjusting, tries to maintain the set distance from
the vehicle ahead. The vehicle may temporarily drive slower than
the set speed while adjusting=>
& in "Description" on page 135. .,

_____________________________________________ A_ d_a ...: p_ t_ i_ v _e_ C_ ru_ is_ e_ C_ o_n _ t_ r_o _ l _ __.11111
Ap plies to vehicles: with Adaptive Cru ise Co nt rol
System status indicator
The text messages and symbols shown in this area of the
display are not displayed perm anently.
T ime intervals
Fig . 139 Sy stem
sta tus indi cator
The different symbols for the time intervals appear if you change the
settings ~ fig. 139 .
The text message ... (three white dots) appears if a setting cannot be implemented with the operating lever . The following are possible
reasons:
• If you pul l the control lever towards you to resume speed but no
requested speed was set .
• I f you push the lever up to increase (or down to reduce) speed
when no speed has been set previously.
• If you push the lever up to increase (or down to reduce) speed
and this speed is outside the range from 20 to 95 mph (Canada
models : 30 to 150 km/h) .
ACC fun cti ona lity limited
The text message AC C functionalit y limited appears when the ACC
System does not detect any objects over an extended time period.
For the time being, the distance to vehicles up ahead is not being
Con tro ls and eq uip­
ment
controlled. The ACC system is not switched off, so increased alert­
ness is required. The following may be reasons for the text message
ACC Functiona lly limited:
• The ACC sensor is dirty. The ACC system is not reacting, or is not
reacting correctly, to veh ic les travel ing ahead.
• I t is possible that you are driving on a road with very light traffic
without anything at the side of the road (e.g. guard rai ls, traffic
signs, trees). As soon as a vehicle is detected by the system again,
it returns to its control range and the text message disappears .
The ACC sensor is located in the area under the front license plate.
If there is a loss of operation due to heavy contamination, this area
should cleaned to restore proper operation .
ACC not available
The text message ACC n ot ava ila ble appears, for example, if the
t emperature of the brakes is excessive. Adap tive Cruise Control is
temporarily not available . A warning tone sounds as a reminder .
ACC not available!
The text message ACC not ava ilable ! appears in the event of a
malfunction . Adaptive Cruise Contro l is tur ned o ff. A warning to ne
sounds as a reminder. Have the system inspected by a qua lified
dea lership .
ACC se nsor bl ocked !
The text message AC C sensor blocked ! appears when the ACC
System can no longer guarantee safe detection of objects . Adaptive
cruise control is turned off. A chime sounds as a rem inder .
To decide whether it is necessary to switch off the ACC (ACC sensor
blocked
!) or if it is only a temporary condition (ACC functionality
limited), the system wi ll also takes into consideration the outside
temperature and/or the windshield wiper operation.
The ACC sensor is dirty o r blocked (e .g . leaves, sn ow).
Vehicle care I I irechnical data

• ..__A_ d_a...: p:,..._ ti_v _ e_ C_ ru_ is_ e_ C_ o_n_ t_ r_ o _ l ___________________________________________ _
The ACC sensor is located in the area under the front license plate .
If there is a loss of opera tion d ue to heavy contam ination, this area
should cleaned to restore proper operation.
E PB activatio n
The text message EPB activation appears if emergency braking was
manual ly initia ted with the Electromechanica l Parking Brake (EPB).
The Adaptive Cruise Contro l is turned off. This is accompanied by a
wa rning tone .
ESP activa tio n
The tex t message ESP activat ion appears i f the Elec tronic Stabil iza ­
tion Program (ESP) has intervened. In this case the Adaptive Cruise
Contr ol is a utomat ical ly turned off . This is accompanied by a
warning tone.
Speed
The set speed in mph (Canada km/h) a lways appears when saving or
cha nging the speed in Adaptive c ruise control =>
page 137, "How is
the speed stored?" and=>
page 138, "Changing stored speed".
Speed range
The text message Speed r ange appears if the current speed is too
low
to set or to hold the requested speed .
When setting a desired speed, it must be at least 20 mph (30 km/h).
At speeds below 12 mph (20 km/h), the cruise control is turned off .
In speeds
over 95 mph (150 km/h), the system remains active and
resumes the speed of 95 mph (150 km/h) if the driver removes the
foot from the accelerator .
Selector lever position!
The text message Selector lever po sition! appears when the
selector lever is moved to position N. In this position, Adaptive
Cruise Control is not ava ilable .•
App lies to vehic les: w ith Ad apt ive Cruise Contro l
Driver intervention prompt
The driver intervention promp t calls on the driver to take
over the situation.
F ig . 140 I nstru ment
c lu ster: Dri ver int er­
v ention prompt
In cer tain situati ons, the braking power of t he Adaptive cruise
control is not sufficient to maintain an adequate distance from the
object ahead. In this situation, the Adap tive cruise contro l ca lls on
you as the driver to take action.
The
driver intervent ion prompt a lerts you visual ly and audibly.
• A red vehicle is shown in the instrument c luster disp lay
=> fig. 1 40 .
• The tex t
DISTANCE! appears in the sta tus line.
• The indicator light
,;:::::,11 .. ,;:::::, in the speedometer b links red.
• An warning tone sounds .
[ i ] Tips
• I f the Adaptive cruise control initiates braking, the hydraul ic
brake system is under pressure. Therefore, the brake peda l distance
is shorter and the pedal "feels" harder.
• Adaptive Cruise C ontro l is switched off af ter pressing the foot -
brake. The speed
saved up this point can be resumed. _,,,

_____________________________________________ A_ d_a ...: pc.. t _i_ v _e_ C_ ru_ is_ e_ C_ o_n_ t_ r_ o _ l __ ,n
• To resume the saved speed, release the brake pedal and press
t he control lever~
page 139, "Turning Adaptive Cruise Contro l off
temporarily".
• If you use the accelerator to go faster than the speed of the
object ahead of you, the
drive r int erv enti on prompt will not be
accompanied by a warning signal.
• If the speed you previously set is exceeded, the indicator light in
t he speedometer wi ll switch off .•
Appl ies to veh icles : w ith Ada ptive C ru ise Cont rol
MMI settings
Individual settings for Adaptive Cruise C ontr ol can be
selected in the MM/ .
Fig. 1 41 MMI D isplay:
Ad apti ve C ru is e
Co ntrol
Sett ings for t he driving program can be adjusted indiv id u­
ally to the particular user and saved in the MMI. This can
only be done with the eng ine running.
- Press the
I CARI funct ion b utton .
- Selec t
System s* in the CAR menu.
Select
Ad aptive Cruise Control. The Adaptive Cruise
Control
menu appears .
Controls and equip ­
ment
Select driving progr am.
- Selec t the desi red driving program .
Setting th e dri ving p rogr am
In the dri ving program menu you can adjus t the characteristics of
Adaptive Cruise Contro l to what you want using
dyn ami c, s ta ndard
or co mfort .
Saving setting s
Your individual settings are automat ical ly saved and assigned to the
remote contro l key being used (remote key storage). If the key is
given to another person, the saved settings remain as they a re. •
System limitations
Ap plie s t o v ehi cles: with Ad apt ive Crui se Co nt rol
General information
Some driving situations which affect the function of the
radar sensor ore described below.
When driving, the Adaptive Cru ise Control is governed by physical
and system -specified limits. Also, under certain circumstances, the
ACC system may react unexpec tedly or late from the dr iver's point
of view. Therefore, always be attentive and intervene, if necessary :
• when driv ing around curves~
page 148
• when vehicles in front are not in line with your
vehic le ~
page 148
• when other vehicles are changing lanes~ page 149
• when other vehic les are difficu lt to detect~ page 149.
I • •