2008 AUDI S6 Owners Manual

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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

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& 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. .,

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If the vehicle in front accelerates, Adaptive Cruise Control a lso accel­
erates up to the speed tha t you have set.
Si tu ation requiring d river interv ention
In some situa tions you will have to use the footbrake to s low the
vehic le down in order to keep a safe distance from vehicle in front
of you or to avoid a rear -end collision . In this situa tion, a symbol
appears and a warning tone sounds~
page 146.
P ass ing an ot her vehicle
If you move into the passing lane and no vehicle is detected ahead,
the Adaptive Cruise Control accelerates to the speed you have set
and maintains it.
O ve rrid e
You can increase your speed at any time by stepping on the acceler ­
ator pedal. After you re lease the acce lerator pedal, the system
adjusts back down to the speed you previously set.
[ i ) Tips
Please note that the amount of acceleration the Adaptive Cruise
Control uses depends on the Distance se tt ing selected. DISTANCE 1
gives you acceleration that is dynamic and sporty . DISTANCE 4 , on
t he other hand, gives more moderate acce leration . For more infor ­
mation about the time intervals~
page 140, "H ow is the distance
(time interval) set?" .
• Please note that if the Adap tive Cruise Contro l has begun braking
t he vehicle and the driver chooses to brake the vehicle additiona lly,
the brakes may feel "hard". This is s imply due to the pressure build­
up of the initial braking.
• Adaptive Cruise Contro l is switched off after pressing the foot­
b rake . The speed saved up this point can be resumed . To resume the
saved speed, release the brake pedal and press the contro l lever
:;) page 139, "Turning Adaptive Cru ise Contro l off temporarily" .•
Con tro ls and eq uip­
ment
A pp lies to veh ic les: with Ad aptive Crui se Co ntro l
Switching the system on and off
Fig . 131 C ontrol l ever :
Swi tchin g on an d off
Switching the system on
- Pull the lever to position G) => fig. 131 .
Switching the system off
-Press the lever to pos ition @ (latc hed). •
Applies to vehic les : w ith Ada ptive Cruise C ont ro l
Hovv is the speed stored?
Fig . 13 2 Cont ro l l eve r:
St oring speed
Wit h the sy stem switched on the speed is stored as follows :-.,
Vehicle care I I irechnical data

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- Drive at the speed you want. The speed must be between
20 and 95 mph (30 and 150 km/h).
Press the !S ETI button ~
page 137, fig. 132 to store the
desired speed.
Af te r the (S ET) button is released, the current speed is stored and
maintained .
The saved speed is now shown in the LED display in the speedom­
eter by one or two illuminat ed red light diod es =>
page 143. At the
same time, the saved speed is also shown for a short time in the
Information line=>
page 745.
[ i ) Tips
For safety reasons , the stored speed is dele ted when the ignition is
turned off. •
Applie s to vehi cle s: wi th Ad aptive Cruise Co ntrol
Changing stored speed
The speed can be changed without touching the acceler ­
ator or brake pedal.
Fig. 133 Control lever:
Changing speed
Increasing speed
- Press the lever up briefly upwards 0 ~ fig. 133. USA
models: the speed increases by about 2.5 mph. Canada
models: speed will increase by one mark on the speed­
ometer scale.
- Press the lever upwards
0 and hold it. As long as you
hold the control switch down, the light diode display in
the speedometer LED display in the speedometer moves
forward and the speed is increased.
Reducing speed
- Press the lever downwards briefly Q. USA models: the
speed decreases by 2.5 mph. Canada models: speed will
decrease by one mark on the speedometer scale.
- Press the lever downwards
O and hold it. As long as you
hold the control switch down, the light diode display in
the speedometer LED display moves backward and the
speed is reduced .
After releasing the control switch, the system regulates the speed to
the value just set.
After each adjus tmen t, the n ewly-set speed is shown for a short
time in the Information line=>
page 145.
[ i ) Tips
You can increase your speed at any time by stepping on the acceler ­
ator pedal. After you release the accelerator pedal , the system
adjusts back down to the speed you previously set. A new desired
speed can be stored at any time by pressing the
( S ETI button
=> page 137, fig. 132. •

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Ap plies to veh ic les: w ith Adapt ive Cru ise Co nt rol
Turning Adaptive Cruise Control off
temporarily
In some situations it makes sense to turn Adaptive Cruise
Control off temporarily.
Turning control off temporarily
Fig. 134 Control lever:
Turning Adaptive
Cruise Control off
temporarily
- To shut off the control w ith the save function, either
depress the brake pedal, or
- Press the con trol sw itch in the direction of the arrow@
~ fig. 134.
Reactivating control
- To resume the saved speed, release the b rake pedal and
press the control switch in the d irection of the arrow
G) .
& WARNING
Improper use of the Adaptive Cruise Control can cause collisions,
other accidents and serious personal injuries. Never resume the
stored speed if the speed is too high for prevailing road, traffic or
weather conditions.
Con tro ls and eq uip­
ment
[ i] Tips
When the system is turned off temporarily, the speed stored at the
time is re ta ined. •
Vehicle care I I irechnical data

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Applies to ve hicles : w it h Ad aptive Crui se Co nt rol
How is the distance (time interval) set?
Distance can be set in four stages.
Fig . 135 Co ntrol lev er:
Se tting d is ta nce
Increasing distance
- Pus h the slid er switch once to the r ig ht G) ::::;> fig. 135. The
dista nce currently set is shown for 3 seconds in the
inst rument cluster d isp lay.
Push the s lid er sw itch
again to the right G) to increase
the d istanc e by o ne s tep .
Reducing distance
Push th e sli de r sw itch once to the left Q. The distance
current ly set is shown for 3 seconds in the instrument
cluster disp lay.
- Pu sh the s lider swi tch
again to the left Q to dec rease t he
dista nce by one step.
The distance at which the Adap tive Cruise Control follows a vehicle
in front is determ ined by
time intervals. A time interva l to a vehicle
in front is estab lished and mai nta ined . This produces a speed ­
dependent interval. The higher the speed , the greater the safety
interval in yards (meters)~& .
For example, i f the interval
DISTANCE 3 is set, a vehicle in front is
followed at a
t i me interval of 1.8 seconds .
Fo r a speed of
55 mph (100 km /h ) this would be equiva lent to a
distance of
4 8 yard s (50 mete rs ) to the vehicle in front.
The distances given here are specified values. The vehicle speed may exceed or fa ll shor t of these target speeds, depending on the
driving situation and the driving sty le of the v ehicle ahead.
DISTANCE 1
Symbol c:::::,_c:::::, __ _
DISTANCE 2
c:::::, __ c:::::, _ -
DISTANCE 3
c:::::,_ - _ c:::::,_
DISTANCE 4
c:::::,_ - - _c:::::,
Time interval
Dynamics 1 second
Sporting 1
.3 seconds
Standard 1.
8 seconds
Standard 2
.3 secon ds
Comfortable

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Distance at 25 mph (40
km/hi
Distance at 50 mph (80
km/hi
Distance at 75 mph (120
km/hi
- -
DISTANCE 1 DISTANCE 2
36 Feet (11 Meters) 46 Feet (14 Meters)
72 Feet (22 Meters) 95 Feet (29 Meters)
108 Feet (33 Meters) 144 Feet (44 Meters)
DISTANCE 3 DISTANCE 4
66 Feet (20 Meters) 82 Feet (25 Meters)
131 Feet (40 Meters) 167 Feet (51 Mete rs)
197 Feet (60 Meters) 249 Feet (76 Meters)
-
How your vehicle responds when accelerating and following other
vehicles with ACC operating can be adapted to your personal wishes
through different driving programs. Depending on which driving
program and which distance you choose, your vehicle will respond more
dynamically or more comfortably when accelerating and
braking. The setting is selected through the MMI menu Adaptive
Cruise Control =>
page 147, "MMI settings".
Settings DISTANCE 1 DISTANCE 2 DISTANCE 3 DISTANCE 4
-
---
Symbol for time interval
Support for:
-Response in "dynamic"
driving program
Response in "standard"
driving program
Response in "comfort"
driving program
-
e:::::::}_e:::::::} ___
Bumper -to -bumper traffic,
brisk driving
1
2
3
1 ----- 2 ----- 3 ----- 4 -- 5
dynamic comfortable
II
e:::::::}_ - e:::::::}_ -e:::::::} _ - - e:::::::} _ II e:::::::}_ - - _e:::::::}
Bumper
-to -bumper traffic, Bumper -to -bumper traffic, Secondary roads, trailer
"keeping pace" comfort -"keeping pace" comfort -
operation
ably ably
-
2 2 3
3 3 4
4 4 5
& WARNING 1-&_ !_ W_A_ R _N _IN _ G_ (c_o _nt _in _ u_ e _d _ l ------------------1
When setting the distance, the driver is responsible for adhering
to the respective national and country-specific regulations.
Controls and equip ­
ment • Following other vehicles too
closely increases the risk of colli-
sions and serious personal injury.
~
I • •

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& WARNING (continued)
• Setting short distances to the traffic ahead reduces the time
and distance available to bring your vehicle to a safe stop and
makes it even more necessary to pay close attention to traffic.
• Always use good judgment and select a safe following distance
for the traffic, road and weather conditions.
[ i ] Tips
The distance setting is reset to the factory default DISTANCE 3 the
next time the ignition is turned on.•
Driver information
Applies to veh icles : with Ada ptive C ru is e Cont ro l
Displays in the instrument cluster
Depending on the driving situation, driver information is
displayed in the instrument cluster.
Fig. 136 Overview instrument cluster
© Display in the speedometer
® Display in the instrument cluster
© Status indicator
© Display in the speedometer
Important information concerning vehicle operation with Adaptive
Cruise Control is shown in display area@. The desired speed you
set is indicated in the speedometer (LED lights around the edge)
and the indicator lights show whether the system has detected a
vehicle traveling ahead. -.,