2015 AUDI A6 Red light

soon as the switch(®) is released, or the accel ­
erator pedal is depressed, emergency braking
stops.
.&_ WARNING
Emergency braking should only be used in
an emergency, when the normal foot brake
has failed or the brake pedal is obstructed .
Using the parking brake to perform emer­
gency braking will slow your vehicle down
as if you had made a full brake applicat ion.
The laws of physics cannot be suspended
even with ESC and its associated compo­
nents (ABS, ASR, EDL). In corners and
when road or weather conditions are bad
'
a full brake application can cause the vehi-
cle to skid or the rear end to break away -
r isking an accident.
Start-Stop-System
Description
Appl ies to vehicles : wit h Start-Stop-System
The Start-Stop-System can help increase fuel
economy and reduce CO
2 emissions.
I n the Start-Stop-mode, the engine shuts off
automatically when the vehicle is stopped,
such as at a traffic light. The ignit io n remains
sw itched on dur ing th is stop phase. The en­
gine will be automatically restarted when
needed.
The last Start-Stop-System setting (on/off us­
ing the button
l ignition is turned on . The LED in the
l --1 but­
ton turns on when the Start-Stop-System is
switched off manually.
Basic requirements for the Start-Stop
mode
- The driver's door is closed .
- The driver' seat belt is latched.
- The hood is closed.
- T he veh icle must have been driven faster
~ than 2.5 mph (4 km/h) since the last stop.
~ -A tra iler is not hitched to the veh icle.
rl I.O
"' rl
"' rl
On the road 79
.&_ WARNING
-Never let the vehicle roll with the engine
sw itched off . You could lose control over
the vehicle. This can lead to a collision
and serious injuries.
- The brake booster and the steering sup­
port do not work while the engine is
sw itched off. More force is required to
stop and to steer the vehicle.
- To reduce the risk of injuries, make sure
that the Start-Stop-System is turned off
when working in the eng ine compart­
ment ¢
page 81.
(D Note
Always switch off the Sta rt-Stop-System
when driving through water¢
page 81.
Starting/stopping the engine
Applies to vehicles: w ith Start -Stop-System
Fig. 80 Instrument cluste r: engine sw itched off (stop
p hase)
.,. Slow the vehicl e to a stop using the brake
and keep pressing the brake pedal. The en ­
gine will switch off. The
tlJ indicator light
appears in the information line in the instru­
ment cluster display.
.. When you take your foot off the brake ped­
al, the engine restarts. The indicator light
turns off.
Additional information
The eng ine will switch off in the P, D, N and S
positions as well as in manual mode. In the P
position, the engine will also remain off if you
take your foot off the brake pedal. The engine
starts aga in when you select another selector ..,_

80 On the road
lever position and take your foot off the brake
pedal.
If you select the R position during a Stop
phase, the engine will start again.
Shift from
D to P quickly to prevent the engine
from starting unintentionally when shifting
through
R.
You can determine for yourself if the engine
will stop or not by reducing or increasing the
amount of force you use to press the brake
pedal. For example, if you only lightly press
on the brake pedal in stop-and and-go traffic
or when turning, the engine will not switch off
when the vehicle is stationary. As soon as you
press the brake down harder, the engine will
switch off.
General information
App lies to vehicles: with Start-Stop-System
The standard Start-Stop-mode can be cancel­
led for different system-related reasons.
Fig . 81 Instrument cluster: engine -Stop tempo rarily
unava ilable
Engine will not switch off
Before each stop phase, the system checks if
certain conditions have been met. For exam·
ple, the engine will
not be switched off in the
following situations:
- The engine has not reached the minimum
required temperature for Start-Stop-mode.
- The interior temperature selected by the A/C
system has not been reached.
- The outside temperature is extremely high/
low .
- The windshield is being defrosted
¢ page 69, ¢ page 71.
-The parking system* is switched on.
- The battery charge level is too low.
- The steering wheel is sharply turned or
there is a steering movement.
- After engaging the reverse gear .
- On sharp inclines.
The
fjJ indicator light appears in the informa­
tion line in the instrument cluster display
¢fig . 81.
Engine automatically restarts
The stop phase is interrupted in the following
situations, for example. The engine restarts
without any action by the driver.
- The interior temperature varies from the
temperature selected in the A/C system.
- The windshield is being defrosted
c:!;> page 69, ¢ page 71.
-The brake pedal is pressed several times in a
row.
- The battery charge level becomes too low.
- High power consumption.
Switching the ignition off automatically
To prevent the battery from draining, the igni­
tion will switch off
automatically when all of
the following conditions have been met :
- The vehicle has already been driven.
- The engine has been turned off by the Start-
Stop-System*.
- The driver's door is opened.
- The driver's seat belt is removed .
- The brake pedal is not pressed down.
- The vehicle is stationary.
In this case, the activated low beam will be re­
placed by the side marker lights. The side
marker lights will switch off after approxi­
mately
30 minutes or when you lock the vehi­
cle.
If the Start-Stop System has
not turned off
the engine or if you have switched the Start­
Stop system off manually, the ignition will
not
be automatically switched off and the engine
will continue to run
c:!;> ,&. .,..

M N
0 I.J "". rl I.O
"' rl
"' rl
WARNING
Never allow the engine to run in confined
spaces - danger of asphyxiation.
@ Tips
If you shift into the 0, N or S positions af­
ter shift ing into reverse, the vehicle must
be driven faster than 6 mph (10 km/h) in
order for the engine to switch off again .
Switching the Start-Stop-System on/off
manually
Applies to vehicles: with Start-Stop-System
If you do not wish to use the system, you can
switch it off manually .
Fig. 82 Cente r console : Sta rt-Stop -System button
.., To sw itch the Start-Stop-System off/on
manua lly, press the
16'> .. I button. The LED in
the button turns on when the system is
switched off.
{t) Tips
If you switch the system off during a stop
phase, the engine will start again auto­
mat ically.
Messages in the instrument cluster
display
Applies to vehicles: with Start-Stop -System
Start-Stop system deactivated: Please re­
start engine manually
This message appears when specific condi ­
tions are not met during a stop phase and the Start-Stop-System will
not be able to restart
the eng ine. If the D or R selector lever posi­
tions were engaged, P will be selected auto-
On the road 81
matically. The engine must be started with
the
I START ENGINE STOP! button.
Start-Stop system: System fault! Function
unavailable
There is a malfunction in the Start-Stop-Sys­
tem. Drive the vehicle to an author ized repa ir
facility for servicing as soon as possible to cor­
rect the malfunction .
Speed warning system
Introduction
The speed warning system helps you to stay
under a specified maximum speed .
The speed warning system warns you if you
are exceeding the maximum speed that you have set. You will hear a warning tone when
your speed exceeds the stored value by ap­ proximately 3 mph (3 km/h) . An indicator
light. (USA models)/ . (Canada models) in
the instrument cluster disp lay also turns on at
the same time. The indicator light./.
turns off when the speed decreases be low the
stored maxim um speed.
Setting a threshold is recommended if you
would like to be reminded when you reach a
certain maximum speed . Situations where you
may want to do so incl ude driving in a country
with a general speed limit or if there is a
specified maximum speed for winter tires .
@ Tips
Even though your vehicle is eq uipp ed w ith
a speed warning system, you sho uld still
watch the speedometer to make sure you
are not driving faster than the speed limit.
Setting the threshold
You can set, change and delete the threshold
in the MMI.
.., Select: !CAR ! function button> (Car)* sys­
tems
control button > Driver assist > Speed
warning.
~

82 On the road
You can s et any t hreshol d between 20 mph
(30 km/h) and 150 mph (240 km/h). Settings
can each be adjusted in increments of 6 mph
(10 km/h) .
Cruise control
Switching on
Applies to vehicles: with cruise control
The cruise control system makes it possible to
drive at a constant speed starting at 20 mph
(30 km/h).
0
f
~
0
Fig . 83 Con trol lev er w it h s et bu tton
Fi g. 84 Dis pla y: Sele cte d s pee d
• Pull the lever to position (D c::, fig. 83 to
switch the system on.
• Drive at the speed you wish to set.
• Press button @to set that speed.
The stored speed and the indicator light
II (US models) ;ii (Canadian models) ap­
pear in the instrument cluster d isp lay
cc> fig. 84. The display may vary, depending on
t he type of d isp lay in your vehicle .
Th is information is also shown briefly in the
Head-up Display *.
The speed is kept constant v ia an engine out­
put adjustment or act ive b rake intervention .
A WARNING
--Always pay attent ion to traffic even when
the cruise co ntrol is switched on . You are
always responsib le for your speed and
the distance between your veh icle and
other veh icles .
- For safety reasons, the cruise cont ro l
should not be used in t he city, in stop­
a nd -go traffi c, on twisting roads and
when road con ditions are poor (such as
ice, fog, gravel, heavy rain and hydro ­
p la ni ng) -risk of accident .
- Tu rn off the cruise co ntro l temporarily
when entering turn la nes , highway exit
lanes or in constr uction zones .
- Please note that inadve rtently "res ting"
your foot on the accelerator pedal causes the cruise control not to brake . This is
because the cruise control is overridden by the driver's acceleration.
- If a brake system malfunction s uch as
overheating occurs when the cruise con­
trol system is switched on, the braking
function in the system may be sw itched
off . The other c ruise control functions re­
main act ive as long as the indicato r light
II (US model s)/ ... (Canadian mo dels)
is o n.
(D Tips
The brake lights illum inate as soon as the
brakes decele rate automatically .
Changing speed
Applies to vehicles: with cruise control
• To increase/de crease the s peed in inc re­
ments, tap the lever in the
0 10 direc tion
c::> page 82 , fig . 83
• To increase/decrease the s peed quick ly, hold
the lev er in the
0 10 d irect ion until the de­
sired speed is displayed .
You can also press the accelerator pedal down
to increase your speed, e .g . if you want to
pass someone. The speed you saved earlie r
will res ume as soon as you release the acceler-
ator pedal. ..,.

Audi adaptive cruise control and braking guard 87
tachometer @and is also shown briefly in
the display @
c::> fig. 90.
.. You must also press the brake pedal when
the vehicle is stopped.
Switching adaptive cruise control off
.. Push the lever away from you into position
@ until it clicks into place. The message
ACC off appears.
@ Indicator lights
II-Adaptive cru ise contro l is switched on.
No vehicles are detec ted up ahead. The stored
speed is ma intained.
• -A moving vehicle is detected up ahead.
The adaptive cruise control system regulates
the speed and distance to the moving vehicle
ahead and acce lerates/brakes automatical ly.
fit -Adaptive cruise contro l is switched on. A
mov ing vehicle up ahead was detected. Your
vehicle remains stopped.
• -When automatic brak ing is not able to
keep enough distance to a previously detected
moving vehicle up ahead, you must take con­
trol and brake
c::> page 89, Prompt for driver
intervention.
© Display
If adaptive cruise control is not shown in the
d isp lay, you can call it up with the multifunc­
tion steering wheel buttons
c::> page 24.
Based on the symbols in the d isplay, you can
determine if the system is maintaining a dis­
tance to the vehicle ahead and what that d is­
tance is.
No vehicle -No veh icle ahead was detected .
White vehicle -A vehicle ahead was detected.
Red vehicle -Prompt for the driver to take ac­
tion
c::> page 89.
Both arrow s on the scale© indicate the dis­
tance to the vehicle ahead. No arrow appears
~ when the vehicle is on an open road and there
0
~ is no object ahead . If an object is detected
:;, ahead , the arrow moves on the scale .
"' ,....,
"' ,....,
The green zone on the scale shows the stored
distance. For information on changing the
stored distance, refer to
c::> page 88 . If the
distance selected is too close or may soon be­
come too close, the arrows move into the red
zone on the sca le .
A WARNING
Improper use of the adaptive cruise con­
trol can cause collisions, other accidents
and serious personal injur ies .
- Pressing the
!SET ! button when driv ing at
speeds below 20 mph (30 km/h), will au­
tomatically accelerate the vehicle to 20
mph (30 km/h), which is the minimum
speed that can be set.
(D Tips
-If you switch the ignit ion or the adaptive
cruise control off, the set speed is erased
from the system memory.
- Th e elec tronic stab ilization control (ESC)
and the anti-slip-regulation (ASR) are au­
tomatically turned on when the adaptive
cruise control is turned on. Both systems
cannot be turned off if the adaptive
cruise contro l is turned on.
Changing the speed
Applies to veh icles: with Audi adaptive cruise control
0
f
• 0
Fig. 91 Selector lever: chang ing the speed
.. To increase or reduce the speed in incre­
ments,
tap the lever up or down.
.. To increase or reduce the speed quickly,
hold
the lever up or down until the red LED @
reaches the desired speed
c::> page 86,
fig .90.
~

M N
0 I.J "". rl I.O
"' rl
"' rl
Audi adaptive cruise control and braking guard 89
When approaching a moving vehicl e up ahead,
the adaptive cruise contro l system automati­
cally brakes to match that object's speed and
then maintains the stored distance.
If the ve­
hicle ahead accelerates, adaptive cruise con­
trol will also accelerate up to the stored
speed .
The higher the speed, the greater the distance
in yards (meters) ¢.&. . The
Distance 3 setting
is recommended .
The distances prov ided are specified values .
Depending on the driving situation and the
how the vehicle ahead is driving, the actual
distance may be more or less than these tar ­
get distances.
The various symbols for the time increments appear briefly in the information line @
¢
page 86, fig . 90 when you change the set ­
tings .
,::::::,_,::::::, ___ Distance 1: This setting corre-
sponds to a distance of 92 feet/28 meters
when traveling at 62 mph (100 km/h), or a
time interval of 1 second.
,::::::, __ ,::::::, __ Distance 2: This setting corre­
sponds to a distance of 118 feet/36 meters
when traveling at 62 mph (100 km/h), or a
time interval of 1.3 seconds .
,::::::, ___ ,::::::,_ Distance 3: This setting corre-
sponds to a distance of 164 feet/SO meters
when traveling at 62 mph (100 km/h), or a
time interval of 1.8 seconds .
,::::::, __ __ ,::::::, Distance 4: This setting corre-
sponds to a distance of 210 feet/64 meters
when traveling at 62 mph (100 km/h), or a
time interval of 2.3 seconds .
A WARNING
Following other vehicles too closely in­
creases the risk of collisions and serious
personal injur y.
- 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 obey applicable traffic laws, use
good judgment, and select a safe follow­
ing d istance for the traff ic, road and
weather conditions .
(D Tips
-Distance 3 is set automatically each time
you switch the ignition on.
- Your standard settings are automatically
stored and assigned to the remote con­
trol key being used.
Selecting the driving mode
Applies to vehicles: with Audi adaptive cruise control
.. Select the desired driving mode in dr ive se­
lect <=;>
page 100.
(D Tips
Your settings are automat ically stored and
assigned to the remote control key being
used.
Prompt for dr iver intervention
Applies to vehicles: with Audi adaptive cruise contro l
Fig. 94 Instrument cluster: req ues t fo r drive r inte rven­
tio n
In certain situations, the system will prompt
yo u to take action . This could happen, for ex­
amp le, if braking by the adaptive cruise con­
trol system is not enough to maintain enough
distance to the veh icle ahead .
The indicator light . and the symbol in the
display will warn you about the situation
<=;> fig. 94. You wi ll also hear an acoustic signal.
- Press the brake pedal to slow your vehicle
down.

90 Audi adaptive cruise control and braking guard
Audi braking guard
Descript ion
Applies to vehicles: with Audi adaptive cruise control
Fig. 95 Instrument cluster: approach warn ing
Braking guard uses radar sensors and a video
camera . It also functions within the limits of
the system when 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 your own vehicle is traveling at a
high speed and approaching a vehicle up
ahead that is moving more slowly . Brak ing
guard does not react if it cannot detect the
situation .
The system advises you of various 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 collision . The indicator
light. in the display comes on .
- The
approach warning is given when a de­
tected vehicle up ahead in your lane is mov ­
i ng much more slowly than you are or if it
brakes sharply . When this warning is given,
it may only be possible to avoid a collision
by swerving or braking sharply . Th e indicator
light. and indicator in the display will
warn you about the danger
c::> fig. 95. You
will also hear an acoustic signa l.
ll This is not ava ilable in some co un tri es .
If you do not react fast enough or do not react
at all to the situation, braking guard will inter·
vene by braking.
- If a coll is ion is imminent, the system will
first provide an
acute warning by briefly and
sharply applying the brakes.
- If you do not react to the acute warning,
braking guard can brake wit h increasing
force w ith in the limits of the system . This
reduces the vehicle speed in the event of a
collision.
- The system can initiate maximum braking
short ly before a collision
1l . Full deceleration
at high speeds occurs only in vehicles with
adapt ive cruise control and side assist (pre
sense plus).
- If the braking guard senses that you are not
braking hard enough when a collision is im·
m inent, it can increase the braking force.
- The pre sense functions also engage when a
collision is imminent
c::> page 190.
Which functions can be controlled?
You can switch braking guard and the dis­
tance/approach warning on or off in the MMI
c::> page 91, Settings in the MMI.
A WARNING
Lack of attention can cause collisions, oth­
er accidents and serious personal injuries.
The braking guard is an assist system and
cannot prevent a collision by itself. The
driver must always intervene. The driver is
always respons ible for braking at the cor­
rect time.
- Always pay close att ent ion to traffic,
even when the braking guard is switched
on. Be ready to intervene and be ready to
take comp lete control whenever necessa­
ry . Always keep the safe and legal dis­
tance between your vehicle and vehicles up ahead.
- Braking guard works within limits and
will not respond outside the system lim· its, for example when approaching a ..,.

M N
0 <.J 'SI' ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
White Active l ane assist is sw itched on
line(s) and ready to p rov ide warnings
on the side that is ind icated
¢ fig. 98.
Red line Act ive lane assist is warning you
(left or that you are about to leave your
right) lane
¢ fig . 98. In addition, the
steeri ng wheel vibrates s light ly.
Gray Act ive l ane assist is switched on
line(s) but is not ready to provide warn-
ings
¢ fig . 99.
Mes sages in the instrument clu ster
display
When the active lane ass ist turns off automat ­
i cally, the i nstrument cluster ind icator goes
out and one of the fo llow ing messages ap­
pears on the display :
Audi active lane a ssist : Currently un availa­
bl e. No camera view
This message appears if the camera is no lon­
ger funct ional after the system has cont inous­
ly failed to detect the lane markings . This
could happen if :
- The camera field of view¢
page 94, fig. 97
is d irty or covered in ice. Clean the area on
the windshie ld.
- The camera field of view is fogged over. Wait
until the fog has cleared before switching
active lane assist on .
- The system has been unable to detect the
lanes for an extended period of time due to
road cond it ions . Switch active lane ass ist
back on when the lines are more visible .
Audi active lane a ssist : Currently un available
A temporary ma lf u nction is preventing lane
assist from operating. Try sw itching active
lane assist on again later.
Audi acti ve lane a ssist : S ys tem fault!
Drive to you r autho rized Aud i dea le r soon to
h ave the ma lfunction co rrec ted.
Audi active lane a ssis t: Pl ea se take over
s te ering
Audi acti ve lane a ssis t 95
This message appears if yo u do not s teer the
vehicle yourself . If this is the case, active lane
ass ist does not switch off, b ut it does sw itch
to the "not ready" stat us. The system can help
you keep the ve hicle in the lane. However it is
your own responsibility to steer and control
t h e ve hicle .
Setting the steering wheel vibration
Applies to vehicles: with active lane assist
11> Select: !CAR ! function button> (Car )* sys­
tem s
control button > Driver a ssis t > Audi
a ctive lan e as sis t.
You can switch the vibrat ing warn ing in t he
stee ring wheel
o n or off .
(D Tips
Your setting is a utomat ically stored and
assigned to the remo te control key being
used.