2013 AUDI S4 SEDAN sensor

Audi adaptive cruise control and braking guard 97
Audi adaptive cruise
control and braking
guard
Introduction
App lies to vehicles: with Audi adaptive cruise co ntrol
The adaptive cruise control system assists the
driver by regu lating vehicle speed and helping
to maintain a set distance to the vehicle
ahead, within the limits of the system . If the
system detects a moving vehicle up ahead,
adaptive cruise control can brake and then ac­
celerate your vehicle. This he lps to make driv­
ing more comfortable on long highway
stretches.
The braking guard system can warn you about
an impending collision and initiate braking
maneuvers ¢
page 103.
Adaptive cruise control and braking guard
have technical limitations that you must
know , so please read this section carefully, un­
derstand how the system works and use them properly at all times.
General information
General information
Applies to vehicles: with Audi adaptive cruise control
Fig. 96 Front of the veh icle: Pos ition of radar sensor
The area that contains the radar sensor
¢
fig. 96 must never be covered by st ickers or
other objects or obstructed with dirt, insects,
snow or ice that will interfere with the adap­
tive cruise control system and Audi braking
guard. For information on cleaning, refer to
¢
page 201. The same applies for any modifi­
cations made in the front area . The
function of the adaptive cruise contro l
system and braking guard is limited under
some cond itions:
- Objects can only be detected when they are
within sensor range
¢page 99, fig . 99.
-The system has a limited ability to detect
objects that are a short distance ahead, off
to the side of your vehicle or moving into
your lane.
- Some kinds of vehicles are hard to detect;
for examp le motorcycles, vehicles with high
ground clearance or overhanging loads may
be detected when it is too late or they may
not be detected at all.
- When driving through curves¢
page 98.
-Stationary objects¢ page 98.
A WARNING
-Always pay attention to traffic when adap-
tive cruise control is switched on and brak­ ing guard is active. As the dr iver, you are
still responsible for starting and for ma in­
tain ing speed and distance to other ob­
jects. Braking guard is used to assist you.
The driver must always take action to avoid
a collision. The driver is always responsible
for braking at the correct time.
- Improper use of adaptive cruise con trol
can caus e collisions, other accidents and
serious personal injury .
- Never let the comfort and convenience
that adaptive cruise control and Audi
braking guard offer distract you from the
need to be alert to traff ic conditions and
the need to remain in full control of yo ur
veh icle at a ll times,
- Always remember that the adaptive
cru ise contro l and Aud i brak ing guard
have lim its -they will not slow the vehi­
cle down or maintain the set d istance
when you drive towards an obstacle o r
someth ing on or nea r the road that is not
moving, such as vehicles stopped in a
traffic jam, a stalled or disabled vehicle.
If registered by the radar sensor, vehicles
or obstacles that are not moving can
trigger a collision warning and if .,.

98 Audi adaptive cruise control and braking guard
confirmed by the video camera, an acute
collision warning.
- For safety reasons, do not use adaptive
cruise control when driving on roads with
many curves, when the road surface is in
poor condition and/or in bad weather
(such as ice, fog, gravel, heavy rain and
hydroplaning). Using the system under
these conditions could result in a colli­
sion.
- Switch adaptive cruise control off tempo­
rarily when driving in turning lanes, on
expressway exits or in construction
zones. This prevents the vehicle from ac­
celerating to the set speed when in these
situations.
- The adaptive cruise control system will
not brake by itself if you put your foot on
the accelerator pedal. Doing so can over­
ride the speed and distance regulation.
- When approaching stationary objects
such as stopped traffic, adaptive cruise
control will not respond and braking
guard will have limited function.
- The adaptive cruise control system and
braking guard do not react to people, an­
imals, objects crossing the road or on­
coming objects .
- The function of the radar sensor can be
affected by reflective objects such as
guard rails, the entrance to a tunnel,
heavy rain or ice.
- Never follow a vehicle so closely that you cannot stop your vehicle safely. The
adaptive cruise control cannot slow or
brake the vehicle safely when you follow
another vehicle too closely . Always re­
member that the automatic braking
function cannot bring the vehicle to a sudden or emergency stop under these
conditions.
- To prevent unintended operation, always
switch ACC
off when it is not being used.
{[) Note
The sensor can be displaced by impacts or
damage to the bumper, wheel housing and
underbody. That could affect the adaptive cruise control system and braking guard.
Have your authorized Audi dealer or au­
thorized Audi Service Facility check their
function.
, In curves
App lies to vehicles: wi th Audi ada ptive c ruise contro l
Fig. 97 Example: d riving i nto a curve
When driving into a curve ~ fig. 97 and out of
a curve, the adaptive cruise control may react
to a vehicle in the next lane and apply the
brakes. You can override or prevent the brak­
ing by pressing the accelerator pedal briefly.
Stationary objects
Applies to vehicles : wi th Audi adapt ive crui se contro l
Fig. 98 Example: object changing lanes a nd stat ionary
object
The adaptive cruise control system only reacts
to objects that are moving or that the system
has already detected as moving. For example,
if a vehicle @, which has already been detect­
ed by the adaptive cruise control, turns or
changes lanes and another stationary vehicle
@ is located in front of that vehicle, the sys­
tem will not react to the stationary vehicle.

Audi adaptive cru ise control and brakin g guar d 99
Vehicles with manual transmission
Applies to vehicles: with Audi adaptive cruise control
The adaptive c ruise control is avai lab le from
the 2nd gear through the 6th gea r in the cus­
tomary RPM.
When the adapt ive cruise control is turned on,
you must p ress the clutch to shift gears (as
usual) . When sh ifting normally or when press­
ing the cl utch, the adap tive c ruise control re­
mains turned on.
Afte r you have engaged the gear, you do
not
need to press the gas peda l. The adaptive
cru ise control accelerates a utomat ica lly if nec­
essary.
I f you press dow n on the clutch fo r too long or
shift/coup le improperly, the adaptive cruise
control may turn off automat ically.
{D) Tips
You cannot tu rn on the adapt ive cru ise
contro l during a sh ifting operation.
Audi adaptive cruise
control
Description
App lies to vehicles: with Audi adaptive cruise control
Fig . 99 Detectio n range
What c an adaptive cruise contr ol do ?
The adaptive cruise control works in conjunc ­
tion with a radar sensor installed in the front
of the vehicle¢
page 97 , fig. 96, which is sub­
ject to designated system limits ¢
page 99.
Stationary objects are d is regarded .
On open roads w ith no traff ic, adaptive cruise
control works like a regu lar cruise control sys- tern.
The stored speed is maintained . When
approaching a moving vehicle detected up
ahead, the adaptive cruise control system au ­
tomat ica lly s lows down to match that vehi­
cle's speed and then maintains the distance
that the driver previously stored . As soon as
the system does not detect a veh icle up
ahead, adaptive cru ise contro l accelerates
ba ck up to the stored speed.
Which fun ctions can be con trolled?
When you switch adapt ive cruise control on,
you can set the current speed as the "control
speed"
q page 100, Switching on and off.
When dr iving, you can stop cruise contro l
¢
page 101 or change the speed ¢ page 101
at any time.
You can also set the distance to the object
ahead and set the adapt ive cru ise contro l driv­
ing program
¢page 102.

Audi adaptive cruise control and braking guard 103
Setting the driving mode for vehicles with
Audi drive select*
Refer to r=;,poge 112 .
(D Tips
Yo ur setti ngs a re automatically store d an d
assig ned to the remote contro l key be in g
used.
Request for driver intervention
A pp lies to vehicles: w ith Audi a daptive cruise control
Fig. 105 Inst rumen t cl uster: reques t fo r drive r in te r·
ve ntio n
In ce rtain si tuations, t he sys tem w ill prom pt
you to take actio n. This cou ld ha ppen, for ex­
ample, if braking by the adaptive cruise con ­
trol system is not enough to maintain enough
d istance to the vehicle ahead.
The inst rument cluste r will war n you about
the danger
r=;, fig. 105:
- A red ve hicle is pic tured in the d is pla y.
- The text
DISTANCE! appea rs in the s ta tus
b ar.
- T he r ed in dicator lig ht
I blinks .
- In add it ion, a warning tone sounds.
Audi braking guard
Description
App lies to vehicles: wi th Audi ada ptive c ruise con tro l
Fig. 106 In str um ent clus ter: approach warnin g
Audi braking guard uses a radar sensor . It also
funct ions wit hin the lim its of the system
whe n adapt ive cruise control is switched off.
What can Audi braking guard do?
When detected in time, the system can assess
situations when a veh icle ahead brakes s ud­
denly or if your own vehicle is traveling at a
high speed and approac hing a ve hicle up
ahead that is movi ng mo re sl ow ly. Audi brak­
ing guard does not react if it canno t detect
the si tua tion.
The system advis es yo u of various s ituations:
- The
distance wa rning is given if yo u are too
close to the vehicle ahead for a long time. If
the vehicle ahead bra kes sharply , yo u will
not be ab le to avoid a collision . The ind icator
light
I in the d isp lay comes o n.
- The
approach warning is given when a de­
tected vehicle up ahead i n your lane is mov­
ing m uch mo re sl owly than you are or if i t
brake s sh arp ly. W hen t his war ning is g iven,
it may on ly be poss ible to avoi d a co llision
by swe rving or b ra kin g sharp ly. The indic ator
light
I a nd indic ator in t he di spl ay w ill war n
you abo ut the d ange r¢
fig . 1 06. You will a l­
so hear an aco ustic s ignal.
If y o u do no t rea ct fas t eno ugh o r do not r eact
at all to the si tuat ion, A udi brak ing g uard w ill
i nt ervene by braking and the message
braking
guard intervention
w ill appea r. ~

104 Audi adapti ve cruise control and br aking guard
- If a co llision is imminent, the system will
first provide an
acute warning by bri efly and
sharp ly app ly ing the brakes .
- If you do not react to the ac ute warning ,
braking guard can brake within the limits of
the system. This reduces the veh icle speed
in the event of a collis ion.
- At speeds under 20 mph (30 km/h), the sys ­
tem can in it iate a complete deceleration
s hortly before a collision .
1>.
- If the Audi braking guard senses that you
are not braking hard enough when a colli­
sion is imminent, it can increase the braking
force .
Which functions can be contr oll ed ?
You can sw itch Audi braking g uard and the
distance/approach warning on or off in the ra­
d io or MMI Qpage 104, Set tings in the ra­
dio/MM!.
A WARNING
Lack of attention can cause col lisions, oth­
er accidents and serious persona l injuries.
The Audi b raking guard is an assist system
and cannot prevent a collis ion by itself.
The driver must always intervene. The dr iv­
er is always responsible for braking at the
correct time.
- Always pay close attention to traffic,
even when the Audi braking guard is
switched on. Be ready to intervene and
be ready to take comp lete control when­
ever necessary. Always keep the safe and
legal distance between your vehicle and
vehicles up ahead .
- Audi braking guard works within limits
and w ill not respond outs ide the system
limits, for examp le when approaching a
stopped vehicle or stationary obstacle
(end of a traff ic jam or veh icle that has
broken down in traffic).
- Always remember that the radar s ensor
for the A udi braking guard works only
within defined detect ion and range limits
l ) Th is is not available in some c oun tries .
that may prevent the proper detection of
other veh icles.
- The radar sensor's function and range
can be reduced by rain, snow and heavy
spray. Moving veh icles up ahead may not
be prompt ly detected or may not be de­
tected at all .
- Reflective surfaces including crash barri­
ers or tunne l entrances may impair the
function of the radar sensor .
(D Tips
- You can cancel the braking that is in it iat­
ed by the system by braking yourse lf, by
accelerating not iceably or by swerving .
- Audi braking guard error messages
Qpage 105.
- Keep in mind that brak ing guard can
brake unexpectedly. Always secure any
cargo or objects that you are transport­
ing to reduce the risk of damage or in­
jury .
Settings in the radio/MMI
Applies to vehicles: with Audi adaptive cruise control
., Sele ct: I CAR I func tion button > Car system s
contro l but ton > Driver a ssist> Audi brak ­
ing guard .
Or
., Select: !CAR ! function b utton > Aud i brak-
ing guard .
S ys tem -
Switch A udi braking guard On and
Off . When you switch the ignition on, the
message
Audi b raking guard off appears if
the system is switch ed off .
Ea rl y warnin g -The distance and approach
warnings in the display can be switched
O n/
Off .
(D Tips
-Yo ur settings are automatically stored
and assigned to the remote contro l key
being used at the times the settings are
made.

Audi adaptive cruise control and braking guard 105
-If you switch the ASR/ESC off or the off­
road mode on (allroad), Audi braking
guard switches off automatically
<=> page 186.
-Switch Audi braking guard off when you
are loading the vehicle onto a vehicle car­
rier, train, ship or other type of transpor­
tation. This can prevent undesired warn­ ings from the braking guard system .
Messages
Applies to vehicles: with Audi adaptive cruise co ntrol
Braking guard: Off
This driver message appears if the system is
turned off via the radio/MM I*. Otherwise, if
the system is turned off, the information ap­
pears every time shortly after the start of the
trip.
Braking guard: Activated
This driver message appears if sharp brake
pressure was applied due to an acute warning.
•••
Three white dots appear if a setting cannot be
selected with the operating lever. For exam­
ple, this happens if you want to raise/lower
the speed even though there was no previous­
ly saved speed .
ACC: Deactivation
The driver message appears in vehicles with
manual transmission . If the clutch pedal was
pressed down for too long, the adaptive cruise
control turns off. A chime sounds as a remind­
er.
ACC: Sensor blocked
This message appears if the sensor view is ob­
structed, for example by leaves, snow, heavy
spray or dirt. Clean the sensor
<=>page 97,
fig. 96.
ACC: not available
The driver message appears if there is a mal­
function. The adaptive cruise control turns off.
A chime sounds as a reminder. Have the sys- tern checked by an authorized Audi dealer or
authorized Audi Service
Facility.
ACC: unavailable
The driver message appears if, for example,
the brake temperature is too high . The adap­
tive cruise control is temporarily unavailable.
A chime sounds as a reminder.
Engine speed!
This driver message appears in vehicles with
manual transmission if the driver had not up­
shifted or downshifted in time while using
adaptive cruise control braking or accelerat­ ing, causing the vehicle to exceed or not reach
the permitted limit speed. The adaptive cruise
control turns off. A chime sounds as a remind­
er .
Shift lever position!
Vehicles with an automatic transmission: the
driver message appears if the selector lever is
shifted to the N position . The adaptive cruise
control is not available while in this position .
Vehicles with manual transmission: the driver message appears for vehicles with manual
transmission if there is no forward gear en­
gaged, meaning if the reverse gear or the 1st
gear is engaged or if the selector lever is in
the neutral position. The adaptive cruise con­
trol is not available while in this position.
Stabilization control (ESC)
This message appears if the electronic stabili­
zation control (ESC) is taking action to stabi­
lize the vehicle. The adaptive cruise control
turns off . A chime sounds as a reminder.
Speed too low
This message appears if the current speed is
too low
to set or to maintain the desired
speed .
The speed being saved must be at least
20 mph (30 km/h). The cruise control is
turned off for speeds lower than 12 mph
(20 km/h). The adaptive cruise control re­
mains turned on for speeds above 95 mph
(150 km/h) (override).
It will stabilize again at.,..

Audi side assist Lane change assistant
Description
Applies to vehicles: with s ide assist
Fig . 107 Sensor detection range
Fig. 108 Disp lay on the exterior mirror
Side assist he lps you monitor your blind spot
and traffic behind your veh icle. W ith in the
limits of the system, it warns you about
vehicles that are coming closer or that are
traveling w ith you within sensor ra nge
(D
c::, fig . 107: if a lane change is class ified as crit­
ical, the display @ in the exterior mirror
c::> fig. 108 turns on.
The display in the left exterior mirror provides
assistance when making a lane change to the l eft, while the display in the right exter ior mir­
r or p rov ides assistance when making a lane
change to the right.
Information stage
As long as you do not activate the turn signal,
side assist
informs you about vehicles that are
detected and class ified as crit ical. The display
i n the respective mirror turns o n, but is d im.
Aud i side assist 10 7
The display remains d im intentionally in the
information stage so that your view toward
the front is not disturbed .
Warning st age
If you activate the turn signal, s ide assist
warns you about veh icles that are detected
and classified as critical. The display in the re ­
spective mirror blinks brightly . If this hap­
pens, check traff ic by glancing in the rearview
mirror and over your shoulder¢
A in General
information on page 108.
@ Tips
- You can adjust the brightness of the dis­
play @¢
page 109.
-Please refer to the instructions for tow­
ing a trailer located in¢
page 108.

108 Audi side assist
General information
App lies to vehicles: with side assist
®
©
Fig. 109 Driving s it u at ions
AU Dr- l
• •
Fig . 11 0 Rea r of th e ve hicle: pos it io n of t he se nso rs
Side assis t fu nctions at speeds above ap prox i­
ma tely 19 mph (30 km/h).
(D V ehicles that are approaching
In certain cases, a vehicle will be classified as
cr itical for a lane change
even if it is still
somewhat far away. The fas ter a vehicle ap­
p ro aches, the sooner the disp lay in the exteri­
or m irror will t urn on.
@ Vehicles traveling with you
Vehicles traveling w ith you are indicated in the
exterior m irror if they are classified as cr it ical
for a lane change. All vehicles detec ted by
side assis t are in dicated by the time they en­
ter your "blind spot", at the latest.
@ Vehicles left behind
If you s low ly pass a ve hicl e tha t sid e ass ist has
dete cted ( the difference in s peed between the
vehicle and you r vehicle is less than 9 mph ( 15
km/ h), t he display in the exterior mirro r turns
on as soon as the vehicle enters your blind
spot.
The disp lay wi ll not t urn on if you quickly pass
a vehicle that s ide assist has detected (t he d if ­
f erence in speed between the ve hicle and your
vehicle is greater than 9 mph (15 km/h).
Functional limitations
T he radar senso rs are designed to detect the
left and right adjacent lanes whe n the road
l anes a re the normal width. In certain situa­
t ions, the d isp lay in the exterior mirror may
turn on
even though there is no ve hicle locat­
ed in the area that is cr itical fo r a la ne cha nge.
Fo r example:
- if the lanes are narrow or if your are driving on t he edge of your lane. If this is the case,
the system may have detected the vehicle in
another la ne that is
not adjacent to you r
cur rent lane .
- if you a re driving throug h a c urve . Side assist
may react to a vehicle that is one lane
ove r
from the ad jacent lane .
- if side assist reacts to other objects (such as
high or d isp laced gua rd rails) .
- In poor weather conditions. The side assist fu nctions are limited .
Do not
cover the radar sensors c::> fig. 110 with
stickers, depos its, bicycle wheels or other ob­
jects, because this will affect the funct ion. Do
not use s ide ass ist when towing a trailer . For
i nforma tion on cleaning, refe r to
c::> page 201 .
&_ WARNING
-Always pay a ttention t o traffic and to th e
ar ea arou nd your vehi cle. Side a ssist c an­
no t repl ace a driver 's atte ntion. The driv ­
er a lone is always res ponsible fo r lane
cha nges a nd similar driving maneuvers.