warning light AUDI S4 2018 Service Manual

Driving
"' Keep the brake pedal pressed and engage the
fo llowing se lector lever positions one after the
other: N, D and back to N.
"' Turn the eng ine off again .
"' Grasp the socket wrench w ith both hands and
pull it up and out carefully to remove
<=> (D .
"' Reinsert the cover and rubbe r mat.
When the parking lock emergency re lease is
used, the
mJ ind icator light and the N selector
lever position tu rn on in the instrument cluster .
The message
Dang er of rolling away! P not pos­
s ible . Please apply parking brake
a lso appea rs .
.&_ WARNING
- Only activ ate the emerge ncy re le ase while
on a level s urface o r a slig ht slope.
- T he pa rking lock may only be released using
the emergency release if the parking brake
is set. If i t is not functioning, secure the ve­
hicle from rolling using the brake peda l or
other s uitab le means, s uch as blocking a
front and a rear wheel. An unsec ured vehicle
may roll away, wh ich increases the r isk of an
acc ident.
- To reduce the risk of an accident, you m ust
not drive when the eme rgency re lease is ac­
t ivated.
(D Note
- Read and fo llow the impo rtant instr uctions
abo ut towing<=>
page 376.
- The risk of damage increases if you do not
r emove the socket wrench carefully when
resett ing the pa rking lock.
98
-

a co .... N ,....
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Trailer towing Driving with a trailer
General information
Your Audi was designed primarily for passenger
transportation .
If you plan to tow a trailer, please remember that
the additional load will affect durability, econo­ my and performance.
Trailer towing not only places more stress on the
vehicle, it also calls for more concentration from
the driver.
For this reason, always follow the operating and
driving instructions provided and use common
sense.
Technical requirements
Trailer hitch
Use a weight-carrying hitch conforming to the
gross trailer weight. The hitch must be suitable
for your vehicle and trailer and must be mounted
securely on the vehicle's chassis at a technically
sound
location . Use only a trailer hitch with a re­
movable ball mount . Always check with the trail­
er hitch manufacturer to make sure that you are
using the correct hitch.
Do not use a bumper hitch.
The hitch must be installed in such a way that it
does not interfere with the impact -absorbing
bumper system. No modifications should be
made to the vehicle exhaust and brake systems .
From time to time, check that all hitch mounting
bo lts remain securely fastened.
When you are not towing a trailer,
remove the
tra iler hitch ball mount . This prevents the hitch
from causing damage shou ld your vehicle be
struck from beh ind ¢
,&. .
Trailer brakes
If your trailer is equipped with a braking system,
check to be sure that it conforms to all regula­
tions .
Trailer towing
The trailer hydraulic brake system must not be
directly connected to the vehicle's hydraulic
brake
system ¢.&. .
Safety chains
Always use safety chains between your vehicle
and the trailer.
Trailer lights
T ra iler lights must meet all regulations . Be sure
to check w ith your author ized Audi dealer for cor­
rect wiring, switches and relays.
Mirrors
If you are unable to see the traffic behind you us­
ing the regular outside mirrors, then you
must in­
stall extended mirrors. It is important that you
always have clear vision to the rear.
,8. WARNING
After removing the traile r hitch, do not store
it in your vehicle. In case of sudden braking,
the hitch could fly forward and injure you or
your passengers.
Operating instructions
Maximum trailer weight
A trailer for your vehicle is limited to a typical
class 1 or class 2 trailer.
Trailer load distribution
Be sure the load in the trailer is held securely in
place to prevent it from shifting forward, back­
ward or sideways.
Never allow a passenger to ride in a trailer ¢.&.
in Driver messages on page 100 .
Engine cooling system
Towing a trailer makes the engine work harder. It
is important that the cooling system's perform ­
ance is up to the additional load. Make sure that
the cooling system has enough fluid.
Tire pressure
When towing a trailer, inflate the tires of your
vehicle to the tire pressure listed under "Full
load" on the label ¢ page 344. Inflate trailer
99

Trailer towing
tires to tra iler and tire manufacturers ' specifica­
tions.
Lights
The headlig ht settings should be chec ked with
the t railer at tached before d riving off. Check to
make su re both vehicle and trailer lights are
wo rking properly.
Safety chains
Be sure t railer safety chains are properly connect­
ed from the trai le r to the h itch on the veh icle.
L eave enough sla ck in the c ha ins to permi t turn­
ing corners . When you install safety chains, ma ke
sure they wi ll not drag on the road when yo u are
driv ing .
The cha ins shou ld cross u nder the trailer tongue
to prevent it from dropp ing in case of separation
from the h itch .
Driver messages
Driving with a trailer requires extra caution.
Weight d istribution
Towing a loaded trailer w ith an empty car resu lts
in a hig hly unstable dist ribution of weight . If this
cannot be avo ided, drive at very low speeds on ly
to avoid the risk of losing s teering con trol.
A "balanced " rig is eas ier to operate and control.
This means that the tow vehicle should be loaded
to the extent possible and permissible , while
keep ing the tra ile r as lig ht as possib le under t he
circumstances . Whenever possible, t ransfer
some cargo to the l uggage compartment of the
tow vehicle whi le observ ing tongue load req uire­
ments and ve hicle loading conside rat ions.
Speed
The h igher the speed, the more d ifficult i t be­
comes for the drive r to contro l the rig. Do not
d rive at the maximum permissible speed. Reduce
your speed even more if load, weath er or w ind
conditions are unfavorable
-part icularly when
going downhill.
100
Reduce vehicle speed immediately if the trailer
shows the slightest sign of swaying.
Do not try
to stop the swa ying by a ccelerating.
Observe speed limits. In some a reas, speeds fo r
vehicles towing tra ilers are lower than for regular
vehicles .
Always apply bra kes early. Whe n driving down­
hill, shift in to a lower gea r to use the eng ine
b raking effect to slow the vehicle . Use of the
bra kes alone can cause them to overheat and fai l.
Coolant temperature
The coo lant tempe rat ure gauge 9 page 11 must
be obse rved caref ully. The coolant temperature
can increase i f you drive o n long inclines in a low
gear at high engine speeds . Reduce your speed
immediately if the LEDs in th e top part of the dis­
play turn on.
For more info rmation abou t indicator lig hts, re­
fer
to . ~page 30 .
A WARNING
Anyone not prope rly restrained in a moving
vehicle is at a much greater risk in an acci­
dent. Never let anyone ride in your car who is
not properly wear ing the restraints provided
by Aud i.
Trailer towing
information
' Important to know
-
Your vehicle handles differently when towing a
trailer because of the addit ional weight and dif­
ferent weight distribution . Safety, performance
and economy will greatly depend on how ca refu l­
l y you load your tra ile r and ope rate yo ur rig.
Before you actually tow your trailer, pract ice
turning, stopping and backing up in an area away
from traffic . Keep pract icing u ntil you have be­
come complete ly familiar w ith the way yo ur vehi­
cl e- tra ile r combination behaves and respo nds.

Ass is tance sy stems
Assistance systems
Electronic speed Limiter
Your vehicle may be factory equipped with tires
that are rated for a maximum speed of 130 mph (210 km/h). This is less than the maximum speed
of your vehicle. To reduce the risk of sudden tire
failure and loss of control if the vehicle is operat­
ed at excessive speeds, your vehicle also has an
electronic speed limiter. The electronic speed
lim iter prevents your vehicle from going faster
than the t ire speed rating. For mo re information
<=>page 334.
If the engine control unit receives faulty vehicle
road speed signals, the Malfunction Indicator
L amp (MIL)
¢..ffi will illumina te. If this occurs,
con tact the nearest au thorized A ud i dealer for
assistance.
_& WARNING
Always observe the posted speed limits and
adjust you r speed to suit prevailing road, traf­
fic and weather conditions. Never drive your
vehicle faster than the maximum speed rating
of the tires installed.
Speed warning system
Introduction
Applies to: vehicles with speed warning system
The speed warning system helps you to stay be­
low a specified maximum speed that can be set,
changed or deleted in the Infotainment system.
-
The speed warning system warns you if you are
exceeding the maximum speed that you have set .
A wa rning tone will sound as soon as you r speed
ex ceeds the s tored v alue s light ly. Th e indicato r
light also turns on in the instrument cluster dis­
p lay
ct] (USA models)/ [SJ (Canada models) and
a message . The indicator light
(CJ / [SJ and the
message turn off if the speed falls back be low
the stored maximum speed.
Se tting a threshold is recommended if you would
like to be reminded when yo u reach a certain
maximum speed. Situations where you may want
to do so include driving in a country with a gener-
102
al speed limit or if there is a spec ified maximum
speed for winter tires.
Setting the warning threshold
Se lect in the Infotainment system: I ME NU I but­
ton
> Vehicle > left co ntro l bu tton > Driver as sis­
tance
> Speed warning > Manu al.
(D Tips
Regard less of the speed warning sys tem, you
shou ld alw ays mo nitor your speed using the
speedometer a nd make sure yo u are fo llow ing
the lega l speed limit.
Cruise control system
Switching on
Applies to: vehicles with cruise control system
The cruise control system makes it possible to
drive at a constant speed starting at
15 mph
(20kmlh).
0
f
~
0
Fig . 103 Operat ing lever: c ru ise control system
.,. To switch the system on, pu ll the lever into po -
sition@<=> fig. 103 .
.. Drive at the speed to be mai ntained.
.. To store the speed, press the button @.
The stored speed and the
ftji(l)~14 (USA models) I
l'I (Cana da models) indicator light appear in the
instrument cluster display. An additional indica­
tor appears in the head-up display *.
The speed is maintained by modifying engine
power or through an active brake intervention.
A WARNING
-Always pay attention to the traffic around
you when the cruise control system is in
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In d ic at or ligh ts and messages in the instr ument
cluster display inform you about the current sit ­
uation and setting.
A n ad dit iona l in di ca tor appears in the head -up
d isp lay*.
Switching adaptive cruise control on
" Pull the lever toward you in to posi tion @
¢fig. 111.
Storing the speed and activating regulation
" To store the cu rrent speed , press the ISET ! but­
ton
¢ fig . 111 . The stored speed is shown in the
speedomete r in the LED
line @ and appears
br iefly i n the status
line @¢fig . 112 .
"Applies to: vehicles with automat ic transmis­
s ion: To acti va te the cont ro l when st ation ary,
also press the bra ke peda l.
Switching adaptive cruise control off
" Push the lever away from you in to posi tion @
u nti l it clicks into place. The message ACC:
off
appears.
@ Indicator lights
fll-Adaptive cru ise con trol is switched on . No
ve hicles are detected ahead. The stored speed is
m ain tained .
•-A vehicle d rivi ng a head was detected. The
adapt ive cr uise control system regulates the
speed and distance to the veh icle dr iv ing ahea d
a n d accelerates/brakes automatically .
• - Automatic transmission: adaptive cruise
control must be sw itched on . A veh icle was de­
tec ted ahead . Yo ur vehicle is s tat io nary and w ill
n ot sta rt driving au tomatically .
tii-Automatic transmission : adaptive cruise
control must be sw itched on . No vehicles were
detected ahead . Your veh icle is stationary a nd
w ill no t start dr iv ing automa tica lly .
• -The automatic braking is not enough to
maintain a sufficient distance to a veh icle dr iv ing
ahead . You must
in tervene ¢ page 114, Driver
intervention request .
Assistance systems
© Instrument cluster display
If the Driver assistance di spl ay is not shown in
t h e instr ument cluster d isp lay, you can open it
u sing the m ultif unct ion steering whee l buttons
¢ page 13.
Ba sed on the gr aphic dis pla y, you can dete rmine
i f th e sys tem is maintain ing a d istance to the ve ­
hicle d riving ahead a nd what t hat distance is .
No vehicle -no vehicle was detec ted dr iv ing
ahe ad.
Silver vehicle -a vehicle was detected driving
ahea d.
Red veh icle -request for drive r interve ntion
¢ page 114.
The five distance bars on the gauge © represent
t h e set distance (refer
to ¢ page 113 for infor­
mation o n how to change the d ista nce). If you
fall be low the selected d ista nce, the distance
bars become red from the bo ttom upwa rd.
.&, WARNING
Applies to: vehicles w ith automatic transm is­
sion: If you pre ss t he
I SET ! butt on whe n driv­
i ng at speeds below 20 mp h (30 km /h) , the
ve hicle accelerates au toma tic ally up to 20
mph ( 30 km/h), which is the m inimum speed
that can be set.
@ Tips
- If you swit ch the ig nitio n or the ad ap tive
c ruise cont rol sys tem o ff, the set s peed is
erased fo r safety reasons .
- The e lec troni c sta biliz ation control ( ESC)
and the an ti- slip -regul ation (AS R) are auto ­
matically switc hed on when t he adaptive
cruise cont rol is switched on.
111

Predictive control
(efficiency assist)
Description
A pp lies to: ve hicles with Audi adaptive cruise co ntro l an d pr e·
di ctive efficiency assist
Fig. 118 Instrument cluster: pred ictive control
General information
The predictive control 1l uses the map informa­
tion from the navigation system in order to react
proact ively when driv ing. Information from the
camera-based traffic sign recognition* is also ap­ plied to recognize traffic signs
<:!)page 104.
When coming up to areas with speed limits or
changes in the course of the road (such as curves,
intersections or traffic circles), the system brakes
automatically and then accelerates back up to
the set speed .
When adaptive cruise control is switched off, the
system only provides notifications without con­
trolled
interventions ¢ page 107.
The driver can override the predictive control at
any time by pressing the accelerator or brake
pedal. If the system changes the vehicle speed to
adapt to speed limits, you can change the speed
using the
lever ¢ page 112, fig. 113 .
Always switch off the predictive control in
the following situations:
- When increased attention is needed from the
driver .
- In poor weather conditions such as snow or
heavy rain.
0 -When driving on roads in poor condition . al ~ N
" N ~ 0 0
~ ll This is not ava ila ble in some co untrie s. al
Assistance systems
Indicator in the instrument cluster display
When switching on the adaptive cruise contro l
for the first time, the message
ACC: 11D + B ac­
tive
in the instrument cluster indicates the avail·
ability of the predictive control.
T he symbol appears when the system
is regulating the speed to match a speed limit . If
this is the case, the system is reg ulating a speed
of 50 mph (80 km/h). The speed is then taken
over by the adaptive cruise control. The speed in
the speedometer LED ring adjusts to the speed to
be maintained
¢ page 110, fig . 112. The ..
¢ fig . 118 symbo l appears when there is an adap ­
tation to the route ahead .
If you are in the Driver assistance display in the
instrument cluster, then the following symbols
will indicate which occurrence the system is cur­
rently responding to:
Symbol Meaning
MPH USA
models:
Speed limit
km/h
Canada models:
speed limiter
Ir
Curve
_l!L
1i1
Intersection
~ ): Traffic c ircle
A WARNING
- Read the warnings on ¢.&. in General infor­
mation on page 109
and on¢ .&. in Descrip­
tion on page 104 .
- Pay attention to traffic and the area around
your veh icle when predictive control is
switched on. The driver is always responsi­
ble for assessing the traffic situation.
- There is an increase in the risk of an acci­
dent, because the system does not consider
"right of way" rules and also does not re-
spond
to traffic lights. ._.
115

a co .... N ,....
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In a speed range under 40 mph (65 km/h), traffic
jam assist can help to keep the vehicle within a lane calculated by the system. W ith in the lim its
of the system, the system controls the steering
automatically when adapt ive cruise control is
switched on . Since traffic jam assist is only an as­
sist system, the driver must always keep his or
her hands on the steer ing whee l and be ready to
steer. The d rive r ca n override the control at any
time by actively steering.
The system is designed for driv ing on express­
ways and highways.
Switching traffic jam ass ist on and off
... Press the button to switch the system on and
off<=> fig. 119.
... To turn the system off completely, select in the
Infotainment system:
I MENU ! button> Vehicle
> left contro l button > Driver a ssistance > Traf­
fic jam a ssist .
If traff ic jam assist was deactivated through the
Infotainment system, you can cont inue operating
the act ive lane assist using
the<=> fig. 119 button
<=> page 126. The traffic jam ass ist functions are
no longer available.
Requirements for using traffic jam assist:
-Traffic jam assist must be switched on in the
Infota inment system .
-Adaptive cruise control must be switched on
and act ive
c;, page 110 .
Always switch off traffic jam assist in the
following situations:
-When increased attention is needed from the
driver .
-In poor weather conditions such as snow or
heavy rain .
-When driving on roads in poor condition .
-In construction zones.
-In city driving .
Traffic jam assist availability:
When you are in the Driver assistance view in the
in str ument cluster disp lay, the indicator light
turns
on ¥ and the message Traffic jam assist
available
appears if a traffic jam situation was
detected. You can open the
Driver assistance dis -
Assistance systems
play using the mu ltifunction steering wheel but­
tons
c;, page 13 . To activate traffic jam assist, you
must press the
<=> fig. 119 button and switch on
the adaptive cruise control
c;, page 110.
Indicator lights
Ill and II-traff ic jam assist is switched on.
Vehicles driving ahead were detected. Your vehi ­
cle adapts whi le driving
c;, fig. 120.
•-Traffic jam ass ist switches off if the driver
does not take over steer ing after multiple driver
intervention requests . The system brakes the ve ­
hicle until it is stationary.
A WARNING
-A lways keep your hands on the steering wheel
so you can be ready to steer at any t ime . The
driver is always responsible for staying in a lane and for assessing traffic s ituations . Read
and follow the warnings
on<=>.& in General
information on page
109 . Never use traffic
jam ass ist in the following situations or you
will increase the risk of an accid ent.
-Driving offroad or on unpaved roads. Traffic
jam assist is only designed for use on paved
roads.
-I n city driv ing o r in construction zones.
-On curv ing stretches of road.
-In narrow lanes.
- In unclear traffic situat ions such as at inter-
sections or toll stat ions.
@ Tips
You are not necessarily guided to the center
of your lane.
117

Assistance systems
Distance indicator and
distance warning
Description
Applies to: vehicles with Aud i adapt ive cruise control
F ig. 12 1 In stru ment cl uste r: dis tance indica tor/wa rning
At speeds above 40 mph (65 km/h), this funct ion
measures the time betwee n the vehicle driv ing
ahead and s hows th is in the instrument cl uster
d isp lay¢ fig. 121 .
You can set a warning t hreshold between 0 .6 and
3.0 seconds . The. indicator light t urns on if
you fall be low the set d is tance.
Switching the distance indicator/warning on
and off
.. In the Infotainment system, selec t: I MENU !
button > Vehicle > left contro l button > Driver
assistance > Distance warning.
A WARNING
-Read an d follow th e warn ings on ¢.&. in
Gen eral inf orma tion on page 1 09.
-The driv er is always r espons ib le for a dhering
to the regulations applicable in that co un­
t ry .
{!) Tips
You may fall below he warn ing t hreshold
briefly whe n pass ing or when quickly ap­
proac hing a s low veh icle . T h er e is no wa rning
in this scen ario . A warn ing is gi ve n only if you
f al l b elow the war ning thr eshold f or an ex ­
t en ded pe rio d o f tim e.
118
Messages
Appl ies to: vehicles with Audi adaptive cruise control
ii ACC with traffic jam assist: unavailable . See
owner's manual
The sy stem cannot gu aran tee t hat i t will dete ct
vehicle s cor re ctl y an d it h as sw itched
off . The ra ­
dar sensors have shifted or are fau lty . D rive to an
aut ho rize d Audi dea ler o r a uth orized Audi Service
Facility immed iate ly to have the malfunct ion cor ­
r ected .
ii ACC with traffic jam assist: currently un­
available. See owner's manual
This mes sage ap pears if the ada ptive cruise con ­
t ro l canno t be activ ated, for example i f th e hood
is ope n.
ti ACC with traffic jam assist : currently un­
available. Sensor vision restricted due to sur­ roundings. See owner 's manual
This message ap pears if the radar se nsor v iew is
obstr ucted, for e xamp le by leaves, snow, heavy
s p ra y or dirt . Cle an the
se nso rs ¢ pa ge 1 09,
fi g. 108 .
ill ACC with traffic jam assist: currently un­
available. Grade too steep
T he road exceeds the maxim um poss ible g rade
for saf e operation . The systems cannot be sw itch ­
ed o n.
ill ACC with traffic jam assist: only available in
D, Sor M
Se lect t he D/S or M se lector lever position.
flJ ACC: available from 1st gear up
Manua l transmiss io n: ada ptive cr uise con trol
works in 1s t gear an d higher.
ti ACC: clutch pedal pressed
Manua l transmiss io n: pressing the clutc h pedal
l onger inte rrupts the cont rol.
IIJ ACC: note engine speed
Manu al transmissio n: this message appea rs if t he
d rive r ha s not shift ed up or down in t ime when
t he a dap tive cr uise co ntrol is b raking o r accele r-
at ing , ca usi ng the ve hicle to excee d or to not
.,.

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reach the perm itted eng ine speed. The adaptive
cr uise control switches off automatically and can­
not be switched back on.
II.I ACC with traffic jam a ssist : currently un­
available. Parking b rake applied
The systems sw itch off if yo u se t the pa rking
bra ke. The systems a re av ailab le aga in after you
release t he p arking bra ke.
llJ ACC w ith traffic jam assist: currently un­
available . Stabilization control (ESC) input
This message appears if the elect ronic stab iliza­
tion co ntro l (ESC) is tak ing action to stab ilize the
ve hicl e. Th e syste ms switch off in th is scenar io.
IIJ ACC w ith traffic jam assist: manual control!
This message appears if the veh icle rolls bac k
when sta rting on a slight incl ine , even though the
systems are active . P ress t he b rake pedal to pre­
ve nt the vehicle from rolling o r sta rt ing to move.
ll'J ACC with traffic jam assist: currently un­
available. Downhill assist activated
You cannot ac tiva te the sys tem w hen hill hold as ·
sist is ac tive.
iii ACC with traffic jam a ssist: manual control!
T his message appea rs if the driver does not take
over steer ing after mu ltip le dr iver intervent io n
reques ts and the system switches off. The vehicle
br akes unt il it is st atio nar y.
l!I Traffic jam assist: unavailable. See own er's
manual
T he system can no longer ensure that the ve hicle
will stay in the lane and switches off. Have yo ur
ve hicle checked by an a uth orized Audi dea ler or
author ized Audi Service Facility if the ma lfu nc­
tion is con tinuous.
l!I Traffic jam assist: Please take over steering!
This message appears as soon as the system
stops d etecting steer ing activity when the system
limits are reached. Always keep yo ur hands on
the steering wheel so you ca n be ready to stee r at
any time .
ifl Traffic jam assist: currently unavailable .
Please fasten seat belt
Assistance systems
T he system switches off when the drive r's safety
belt is unfastened .
fl ACC: efficiency assist not available in this
country
T he ada ptation to speed lim its and routes ahead
i s not available in th is co unt ry .
llJ ACC: predictive control currently unavaila ­
ble. See owner's manual
The adaptation to speed lim its and routes ahead
switches off at speed limits under 20 mph (30 km/h) .
The message can also appear if the adaptation to
speed limits and routes ahead has a temporary
failure. Have your vehicle checked by an autho r­
ized Audi dea ler or author ized Audi Service Facili­
ty if the malfunc tion is con tinuous .
Distance warning: malfunct ion! Please contact
Serv ice
T he system cannot gua rantee that it will detect
vehicl es cor rect ly and it has switched off . T he ra ­
dar sensors have shifted or are fa ulty . D rive to an
authorized Aud i dea le r or aut hori zed Audi Serv ice
Facility immed iate ly to have the malfu nction cor­
r ec ted .
Distance warning: currently unavailable. Sensor
view restricted due to surroundings . See own­
er 's manual
This message appears if the rada r senso r view is
obstructed, for examp le by leaves, snow, heavy
spray or dirt. Clean the sensors
c::, page 109,
fig. 108 .
Distance warning: currently unavailable. See
owner's manual
T his messa ge appears if the system has a tempo ­
rary fail ure. If this occurs mu ltip le t imes, drive to
an a uth o rized Aud i dea le r or a uth orized Audi
Se rvice Facility immed iate ly to have the ma lfunc­
t ion co rrected.
ACC : Please fasten seat belt
T he sy stem is no t complete ly ava ilable if the dr iv­
er's se at bel t is unfas tene d.
Stationary object ahead
.,..
119

Assistance systems
This message appears if you would like to switch
the system on and there is a stationary object di­
rectly in front of your veh icle.
Door open
The system is not ava ilable when the door is
open.
Audi pre sense
Introduction
A pp lies to: ve hicles w ith Audi p re se nse
W ithin the limits of the system, the pre sense
functions can initiate measures in particularly
dangerous situations to protect the veh icle pas­
sengers and other road users .
- Due to the interlinking of various vehicle sys­
tems, crit ical dr iving s ituations can be detected
by
pre sense basic and measures for preventa ­
tive occupant protection are can be initiated .
- The
pre sense front system uses the data from
the adapt ive cruise control* radar sensors and
the camera to calculate the probab ility of a col­
li sion. Withi n the limits of the system, an im­
pending collision with vehicles can be dete cted
in both urban and rural speed ranges. In this
case, the system warns the driver visually,
acoustically and with a jerk on the brakes if nec­
essary. If needed, it can initiate a partial or full
deceleration to reduce the co llision speed or to
avo id the collision under certain c ircumstances .
In conjunct ion with pre sense basic/rear, the
front safety belts are also revers ibly tensioned
when needed . The pre sense front is also active
whe n adapt ive cruise control* is swit ched off.
- Pre sense rear contains pre sense basic func­
tions. It uses the data from the side assist* ra­
dar sensors and calculates within the limits of
the system the probab ility of a rear end coll i­
s ion with the vehicle behind you. Pre sense rear
is also active when side assist* is switched off.
- Within the limits of the system,
pre sense city
uses the camera data and can detect an im ­
pending collision with vehicles and pedestrians.
In this case, the system warns the driver visual ­
ly, acoustically and with a jerk on the brakes if
necessary. If needed, it can initiate a full decel­
eration to reduce the collision speed or to avoid
120
the collision under certa in circumstances . In
conjunction with pre sense basic/rear, the front
safety belts are also reversibly tensioned when
needed .
A WARNING
-
Read the general information inc> & in Gen-
eral information on page 109,
c> & in Gener­
al information on page 130.
(D Tips
- Certain pre sense funct ions sw itch off when
dr iving in reverse.
- The pre sense functions may not be availa­
ble if there is a malfunct ion in the ESC sys­
tem or the a irbag control module.
- Note that the reversible belt tensioner on
the front passenger's side deactivates when
the front passenger's airbag is deactivated .
- Switch the pre sense off when you are not
using public streets or when loading the ve­
hicle onto a vehicle carrier, tra in, sh ip or
other type of transportation. This can pre­
vent an undesired intervention from
the pre
sense system.
Audi pre sense basic
Description
App lies to : vehicles wi th Audi pre sense basic
The pre sense bas ic functions are activated at a
speed of approx imately 20 mph (30 km/h) or
higher .
The following functions can be triggered under certain condit ions w ith in the lim its of the sys­
tem:
- Tensioning of the safety belts (for examp le,
during heavy brak ing): the front safety belts
have reversib le be lt tens ioners. If a collision
does not occur, the safety belts loosen slightly
and are ready to trigger again.
- Closing the windows and sunroof* .
-