2008 AUDI S4 Owners Manual

adaptive cruise control (ACC)135
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Target speed
The target speed set by the driver is indicated by a red diode in the
speedometer.
If the speed setting is between two graduations on the speedom-
eter dial, the two closest diodes will both light up
⇒fig. 143.
It is only possible to set target speeds ranging from 30 to 200 km/h.
This speed range is illuminated slightly by the diodes on the speed-
ometer dial.
Indicator lamp (symbol)
•
No vehicle in front: The green indicator lamp ⇒ page 134,
fig. 144 shows that the adaptive crui se control system is in cruise
mode and that there is no vehicle in front. It maintains the stored
target speed.
•
Vehicle in front: The green indicator lamp shows that the
system has detected a vehicle in front. The speed is adapted to the
vehicle in front. The adaptive cruise control system accelerates and
brakes the vehicle automatically.
•
Driver intervention prompt: When the red indicator lamp
flashes , this is a warning for the driv er to intervene. The driver
has to brake the vehicle with the foot brake. This warning lamp will
always appear when the adaptive cruise control system alone is not
able to brake the vehicle sufficiently to maintain a safe distance to
a vehicle in front. An audible alarm (warning tone) will also sound
when the lamp starts to flash. For further information on the driver
intervention prompt ⇒page 138 .Note
•
If you exceed the target speed by using the accelerator, the
driver intervention prompt will not be accompanied by a warning
tone. The indicator lamp shown in the speedometer will also switch
off if the target speed is exceeded.
•
You can change the volume of the warning tone on the sound
system or MMI* ⇒ page 139, “Setting the warning tone volume and
driving program”.
Applies to vehicles: with adaptive cruise controlInstrument cluster displayRepeatedly press the button on the windscreen wiper lever
to select whether you wish to display information regarding the on-
board computer, the navigation sy stem* or the adaptive cruise
control in this section of the display screen.
Vehicle image
Distance
System status
Vehicle image
The vehicle image will show you whether the system has detected a
vehicle in front.•
Vehicle outlined : No vehicle in front
•
Vehicle in white: A vehicle in front has been detected
•
Vehicle in red: Driver intervention prompt
Distance
The arrows and scale indicate the distance to the vehicle in front.
•
No vehicle in front: If there is no vehicle in front, no arrows will
be shown.
AA
AA
AB
AB
AC
AC
Fig. 145 Instrument
cluster: Display
RESET
AAABACAAAB
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adaptive cruise control (ACC)
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Vehicle in front: If a vehicle is detected in front, the arrows will be
on the scale. The green area of the scale represents the distance
setting. If you approach the vehicle in front slowly, the arrows will
move from the grey area into the green area of the scale.
•
Driver intervention prompt: If you approach the vehicle in front
quickly, the arrows act as a warnin g. When the actual distance is
shorter (or is likely to become shorter) than the distance selected,
the arrows move into the red area of the scale. In certain situations,
you may need to intervene as the driver ⇒page 138, “Driver inter-
vention prompt”.
Status
•
ACC OFF (in white letters): The adaptive cruise control is
switched off.
•
ACC AVAILABLE (in white letters): The system is switched on but
the control has not yet been activated.
•
OVERRIDE (in white letters): You have exceeded the target speed
by accelerating.
•
DISTANCE! (in red letters): The distance to the vehicle in front is
not sufficient and you have to brak e the vehicle with the foot brake.
•
DISTANCE 1 to DISTANCE 4 (in green letters): Shows the time
interval you have selected. The adap tive cruise control is in cruise
mode.
•
DISTANCE 1 - dyn. , DISTANCE 1 - comf. etc. (in green letters): If
the settings are adjust ed on the sound system or MMI* such that
the “standard” driving program is replaced by “comfort” or
“dynamic”, the message above will indicate the setting.
Applies to vehicles: with adaptive cruise controlSystem status indicator in the instrument cluster display
The text messages and symbols in this section of the
display are not shown permanently.Time intervals (e.g.

)
The various symbols for the time intervals -arrow- ⇒fig. 146 appear
when you change the settings.
The symbol
 indicates that the warning tone has been switched
off.
...
The text message ... (three white dots) appears if a setting made
with the control lever cannot be implemented. There can be several
reasons for this:
•
You have pulled the control lever towards you to resume the
programmed cruising speed, without a target speed having been
set.
•
The control lever has been pushed up / down to increase / reduce
the speed, without a target speed having been set.
AC
Fig. 146 Instrument
cluster: Further infor-
mation
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adaptive cruise control (ACC)137
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
•
The control lever has been pushed up / down to increase / reduce
the speed, but the resulting speed would be outside the range of 30
to 200 km/h.
ACC deactivation
The message ACC deactivation sometimes appears on vehicles with
a manual gearbox. If you press the clutch pedal for longer than
about 20 seconds, the adaptive crui se control will be automatically
deactivated and a warning tone will sound.
ACC not available
The text message ACC not available will appear if, for example, the
brakes are overheated. The adaptive cruise control will then tempo-
rarily not be available. This is indicated by a warning tone.
ACC not available!
The text message ACC not available! appears if a malfunction
should occur. The adaptive cruise control will then be switched off.
This is indicated by a warning tone. Have the system checked by a
qualified workshop.
ACC sensor blocked!
The text message ACC sensor blocked! appears if the ACC system
can no longer detect objects reli ably. The adaptive cruise control
will then be switched off. This is indicated by a warning tone.
The ACC sensor is obstructed by dirt or foreign objects (e.g. leaves
or snow). Clean the sensor to restore the function ⇒page 128,
fig. 136.
Engine speed !
On vehicles with manual gearbox, the text message Engine speed !
will appear if the driver does not change gear in time when the
adaptive cruise control accelerates or brakes the vehicle. The adap-
tive cruise control will automatically be deactivated if the engine
speed is not maintained within the permissible range. This is indi-
cated by a warning tone. ESP activation
The text message
ESP activation appears if the Electronic Stabilisa-
tion Programme (ESP) has intervened. In this case, the adaptive
cruise control will automatically be switched off. This is indicated by
a warning tone.
Speed (in km/h)
The target speed (in km/h) will appear in the display whenever it is
stored or changed ⇒page 131, “Setting the speed” and
⇒ page 131, “Setting a new speed”.
Speed range
The text message speed range appears if the current speed is too
low to set or to maintain the target speed.
To set a target speed, the speed of the vehicle must be at least
30 km/h. The cruise control system switches off if the speed falls
below 20 km/h.
If the speed exceeds 200 km/h (OVE RRIDE), the system will remain
active and will reduce the speed to 200 km/h once the driver stops
accelerating.
ACC functionality limited
The text message ACC functionality limited appears if the ACC
system does not detect any objects for an extended period. The
distance to vehicles in front is not being controlled while the
message is displayed. The ACC system is not deactivated, and so
extra care should be taken! The text message ACC functionality
limited can appear for the following reasons:
•
The ACC sensor is dirty. The ACC system is not responding or is
not responding correctly to the vehicles in front!
•
You may be driving on a country road with no traffic and no clear
roadside demarcation (e.g. safety barriers, traffic signs, trees). As
soon as the system detects a vehicle, distance control is resumed
and the text message disappears.
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adaptive cruise control (ACC)
138The ACC sensor is located inside the trim grille (front right)
⇒ page 128, fig. 136. If the sensor is no longer functioning due to
dirt or obstruction in this area, it should be cleaned.
Parking brake !
The text message Parking brake ! appears if the parking brake is
operated. The adaptive cruise control will then be switched off. This
is indicated by a warning tone.
Gear lever position !
On vehicles with manual gearbox the text message Gear lever
position ! appears when no valid forward gear is selected, i.e.
reverse gear or 1st gear is engaged or the gear lever is in the neutral
position. Adaptive cruise control is not available when the lever is in
these positions.
Shift lever position!
On vehicles with automatic gearbox the text message Shift lever
position ! appears if the shift lever is moved to position N. Adaptive
cruise control is not available when the lever is in this position.
Applies to vehicles: with adaptive cruise controlDriver intervention prompt
The driver intervention prompt is a warning for the driver
to reduce speed manually.Fig. 147 Instrument cluster: Driver intervention promptIn some situations the adaptive cruise control system alone is not
able to brake the vehicle sufficiently to maintain a safe distance to
the vehicle in front. The adaptive cruise control system will then call
on you as the driver to ta ke control of the situation yourself.
The Driver intervention prompt provides both a visual and an
acoustic warning.•
A red vehicle symbol will appear in the instrument cluster
display ⇒fig. 147.
•
The system status indicator will show DISTANCE!.
•
The red warning lamp will start to flash.
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adaptive cruise control (ACC)139
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
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An acoustic warning will also sound (unless it has been deacti-
vated in the sound syst em or MMI* settings).Note
•
Pressing the brake pedal will switch off the adaptive cruise
control system. The speed set at that point will, however, remain
stored until the adaptive cruise control is activated again.
•
To resume the programmed cruising speed, release the brake
pedal and pull the control lever towards you ⇒page 132,
“Switching off the system (with speed memory function) and reacti-
vating it”.
•
If you exceed the target speed by pressing the accelerator, the
driver intervention prompt will not be accompanied by a warning
tone. The indicator lamp shown in the display will also switch off
when the target speed is exceeded.
•
If the adaptive cruise control triggers a braking operation the
hydraulic brake system is under pressure. This is why brake pedal
travel will be shorter and the pedal will feel “harder”.
Applies to vehicles: with adaptive cruise controlSetting the warning tone volume and driving program
You can change the adaptive cruise control settings on
the sound system or MMI* to suit your individual driving
style.– Select: Function selector button > adaptive cruise
control .Setting the volume of the warning tone
If the adaptive cruise control syst em switches off (e.g. when the ESP
intervenes) or a driver intervention prompt appears, a warning tone
will sound.
You can set the volume of the warning tone to low, medium , or high .
The new volume will sound briefly after making any adjustment. If
you do not want a tone to sound, select off.
Adjusting the basic settings
You can set the distance (time interv al) you want the adaptive cruise
control system to keep to the vehicle in front by selecting distance
1 , distance 2 , distance 3 or distance 4 .
Fig. 148 Display: adap-
tive cruise control
CAR
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adaptive cruise control (ACC)
140Setting the driving program
In the Driving program menu you can select either dynamic,
standard or comfort according to your personal preferences.
Note
•
We recommend you to leave the warning tone switched on. Even
when the warning tone is switched off, not every warning tone will
be deactivated.
•
When you pass the key on to somebody else please remember to
make the other driver aware of the ACC settings.
•
We recommend a minimum distance setting of DISTANCE 3
(factory default setting).
•
When the ignition is switched off, the distance setting reverts to
the factory default DISTANCE 3. A qualified workshop can cancel
this function. In this case a defa ult distance setting defined on the
sound system or MMI* is applied each time the engine is started.
System limitationsApplies to vehicles: with adaptive cruise controlGeneral notes
The following situations coul d impair the function of the
radar sensor.The adaptive cruise control is subject to given physical limits and
also has certain limits determined by the system itself. Under
certain circumstances the driver may feel that the ACC system is
responding unexpectedly or belatedly. For this reason, please
always give your full attention to road traffic and if necessary take
action yourself:•
When driving through bends ⇒page 140 .
•
When vehicles in front are not in line with your vehicle
⇒ page 141 .
•
When other vehicles change lanes ⇒page 141 .
•
When other vehicles are not clearly discernible ⇒page 141
•
When vehicles are stationary ⇒page 142 .
WARNING
The radar sensor's "field of vision" can be impaired by rain, snow
or a lot of water on the road. This results in vehicles in front not
being properly recognised or, in some circumstances, not being
detected at all. If necessary, take action yourself!Applies to vehicles: with adaptive cruise controlWhen driving through bends
Fig. 149 Driving into a
bendFig. 150 Driving out of
a bend
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adaptive cruise control (ACC)141
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Driving into a bend
When you are driving into a bend
, the ACC system may react to a
vehicle travelling in the other lane and therefore brake the vehicle
⇒ page 140, fig. 149. You can override the braking effect by pressing
the accelerator.
Driving out of a bend
When you are driving out of a long bend, the ACC system may - in
the course of its calculation of th e lane ahead - react to a vehicle
travelling in the other lane and therefore brake the vehicle
⇒ page 140, fig. 150. You can override the braking effect by pressing
the accelerator.
Applies to vehicles: with adaptive cruise controlVehicles in front travelling out of lineVehicles in front which are not in line with your vehicle cannot be
detected by the ACC system until they are within the range of the
sensor.
Applies to vehicles: with adaptive cruise controlOther vehicles changing lanesVehicles which are very close to you when they move onto your lane
cannot be detected by the radar sensor until they move into its
range.Applies to vehicles: with adaptive cruise controlNot clearly discernible vehiclesVehicles that are not clearly discernible, e.g. a motorcycle travelling
in front of you and vehicles with a large amount of ground clearance
or protruding freight, are often identified late or may not be
detected at all.
Fig. 151 The vehicle in
front is outside the
range of the radar
sensor
Fig. 152 A vehicle is
changing lanesFig. 153 Motorcycle in
front
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adaptive cruise control (ACC)
142Applies to vehicles: with adaptive cruise controlStationary vehiclesIf a vehicle detected by the ACC system turns off or changes lane
and another stationary vehicle is loca ted in front of that vehicle, the
ACC system will not react to the stationary vehicle ⇒fig. 154 and
⇒ fig. 155.
Audi braking guardApplies to vehicles: with adaptive cruise controlDescription
Audi braking guard warns you in case of an impending
collision with a vehicle in front.Audi braking guard is active at speeds above appr oximately 30 km/h
and operates within the system limitations ⇒ page 140 even when
the adaptive cruise control is deactivated.
The radar sensor is fitted at the front of the vehicle ⇒page 130,
fig. 137. The system requires reflecting surfaces in order to be able
to measure the distance. If the ACC is unable to measure the
distance it will not respond.
Once the system has measured the distance, it can assess a
dangerous situation where a vehicle in front brakes suddenly or you
are driving fast and approach a vehicle travelling at a much slower
speed. The system warns you as soon as it anticipates that a poten-
tial collision with the vehicle in front can only be avoided by hard
braking or by taking evasive action.
The system has a preset response time so that it can warn you in
time. In certain situations, the system response time will be reduced
dynamically, e.g. when you are accelerating onto a motorway.
Braking, lateral acceleration and steering angle are other factors
Fig. 154 Vehicle
turning off and vehicle
stationaryFig. 155 Vehicle
changing lane and
vehicle stationary
Fig. 156 Instrument
cluster: Display
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