2015 AUDI A4 power steering

Audi drive select Driving settings
Introduction
App lies to vehicles: with Audi drive select
Drive select provides the possibility to experi­
ence diffe rent types of vehicle sett ings in one
vehicle. For instance, using the three
Com­
fort, Auto and Dynamic modes, the driver can
switch from a sporty to a comfortab le driving
mode with the press of a button.
Addit ionally, in vehicles with
MM I*, the vehi ­
cle setup for
Individual* mode can be cus­
tomized by you. This makes it possib le to
combine settings such as a sporty engine tun­
ing with comfortable steering.
A WARNING
Improper use of the Audi drive select can
cause collisions, other acc idents and seri­
ous personal injury.
Description
Applies to vehicles: with Audi drive select
The vehicle setup in each mode depends on
the vehicle's features . However, the engine,
automatic t ransmission* and steering are al­
ways involved.
-
Engine and automatic transmission*
Depending on the mode, the engine and the
automatic transmission respond quicker or in
a more ba lanced manner to acce lerator pedal
movements. In the sporty dynamic mode, the
automatic transmission shifts at higher RPMs .
Steering
The steering adapts in terms of steering effort
and steering ratios . Indirect steer ing that
moves easily, like the steering in comfort
mode , is best su ited to long dr ives on a high­
way. In contrast, dynamic mode prov ides
~ sporty, di rect steering.
0
11'5 The follow ing applies to vehicles with dynam ic ,....,
~ steer ing*: the steering ratio changes based on
~ vehicle speed in order to maintain optimum ,....,
Audi drive select 115
steering effort for the driver at all times. This
sets the steering to be less sensitive at higher
speeds in order to provide improved vehicle
control. At reduced speeds, however, steering
is more direct in order to keep the steering ef­
fort as minimal as possible when the driver is
maneuveri ng the veh icle . At low and average
speeds, dynamic steering addit iona lly pro­
vides more responsive steering performance.
Adaptive dampers*
The adaptive dampers* use sensors to record
information regarding steering movements,
braking and acceleration operations by the
driver , road surface, driving speed, and load.
T his makes it possible to adapt damp ing to
the driving situation v irtually i n rea l time.
Drive select also makes it possible to satisfy
the desire for sporty suspension (Dynamic)
and comfortab le suspension (Comfort) with­
out giving up balanced tuning (Auto) .
Sport differential*
As a component of the all whee l dr ive system
(quattro)
~ page 190, the sport differential*
distributes the driving power to the rear axle
depending on the situation . The distribution
of power varies depending on the mode se­ lected. The goal is a high level of agility and
ability to accelerate on curves . The vehicle is
very respons ive to steering .
Audi adaptive cruise control*
The behavior when accelerating can be adjust­
ed from comfortab le to sporty, depending on
the drive select mode. Adaptive cruise control
also responds to the driving behavior of the
vehicle ahead in a more conservative or sporty
manner .
Engine sound*
The sound of the engine is adapted to the se­
lected mode and ranges from subtle to sporty.
0) Tips
-In some models, the maximum vehicle
speed can only be reached in the
Auto
and Dynamic modes.

@ Tips
Your vehicle may be equipped with Audi
connect. Your use of certain Aud i connect
features req uires wireless serv ices that are
provided by a third party wireless telecom­
municat ions provider. For details regard­
ing how information obtained through
Aud i connect is collected, processed,
transmitted, used, and shared, please see
your contra ct w ith the wire less telecom ­
municat ions provider and the "About A udi
connect" tab in your vehicle's MMI*:
!MENU ! button> Audi connect > About
Audi con nect .
Electronic Stabilization
Control (ESC)
Description
ESC helps to improve road holding and vehicle
dynamics to help reduce the probability of
skidd ing and loss of veh icle control. It works
only when the eng ine is running. ESC detects
certain difficult driv ing situations, including
when the vehicle is beginning to spin (yaw) out of cont ro l and he lps you to get the vehicle
back under control by select ively b rak ing the
wheels, and/or red ucing engine powe r and
p roviding steering assistance to help hold the
ve hicle on the driver's intended course . The in­
dicator light
DJ in the instrument cluster
blinks when ESC is taking action to help you
control the vehicle.
ESC has limitations.
It is important to remem­
ber that ESC cannot overcome the laws of
phys ics. It will not a lways be able to help out
under all conditions you may come up against.
For example, ESC may not always be able to
h elp you master situat ions where there is a
sudden change in the coefficient of fr iction of
the road surface. When there is a sect io n of
d ry road that is s udden ly cove red with water,
slush o r snow, ESC canno t perform the same
way it would on the dry su rface.
If the vehicle
hydroplanes (rides on a c ush ion of wate r in­
stead of the road surface), ESC wi ll not be
ab le to he lp you steer the veh icle because con-
Int ellig ent technolog y 185
tact with the pavement has been interrupted
and the vehicle cannot be braked or steered .
D uring fast corner ing, particular ly on wind ing
roads, ESC cannot always deal as effectively
with difficult dr iv ing s ituations than at lower
speeds. When towing a trailer, ESC is not able
to help you regain control as it would if you
were not tow ing a trailer.
Always adjust your speed and driving style to road, traffic and weather conditions . ESC can­
not override the vehicle's physical lim its, in­
crease the availab le tract ion, or keep a veh icle
o n the road if road departu re is a result of
driver ina ttent io n. Instead , ESC imp roves the
poss ibility of keep ing t he vehicle under con­
trol and on the road during extreme maneu­
vers by using the driver's steering i nputs to
help keep the vehicle go ing in the intended di­
rect ion. If you are traveling at a speed that
causes you to run off the road before ESC can
provide any assistance, you may not experi­
ence the benefits of ESC.
ESC is switched on all the time. In certain sit­
uat ions when you need less traction, you can
switch off ASR by pressing the butto n
[ill
~ page 187, fig. 174 or~ page 187,
fig. 175. Be sure to sw itch ASR on aga in when
you no lo nger need less traction.
The following systems are integrated in the
ESC:
Anti-lock bra king sy stem (ABS )
ABS prevents the whee ls from locking up
when brak ing. T he vehicle can st ill be steered
even dur ing hard braking. App ly steady pres­
su re to the brake peda l. Do not pump the ped­
al. A pulsing in the brake pedal ind icates that
the system is helping you to brake the veh icle .
Brake assi st system
The brake ass ist system can decrease braking
distance. It increases brak ing power when the
drive r presses the brake peda l quickly in emer­
gency s ituations. You must press and hold the
brake pedal unti l the s ituation is over. In
vehicles wi th adap tive c rui se control*, the
brake assis t system is more sensitive if the
•
•

186 Intelligent technology
distance detected to the vehicle ahead is too
smal l.
Anti-slip regulation (ASR )
ASR reduces eng ine power when the drive
wheels begin to spin and adapts the fo rce to
the road condit ions. This makes it eas ier to
start, accelerate and drive up hills .
Electronic differential lock (EDL)
The EDL brakes wheels that are spinn ing and
transfers the d rive powe r to the other drive
wheel or whee ls if the vehicle is equipped with
a ll-wheel drive* . This function is not avai lab le
at higher speeds.
I n extreme cases , EDL automat ica lly switches
off to help keep the brake on the braked whee l
from ove rheating . EDL wi ll switch on again au­
tomatically when conditions have returned to
normal.
Steering recommendation
The ESC helps to stabilize the ve hicle by
changing the steering torque.
In vehicles with dynam ic steeri ng*, ESC also
he lps to stabilize the stee ring in critical s itua­
tions.
Electronic interaxle differential lock* /
selective wheel torque control*
The electronic interaxle d ifferential lock (front
wheel drive) or the select ive wheel torque
con trol ( all wheel d rive) oper ates when driving
through curves . The front whee l on the inside
of the cu rve or both whee ls on the inside of
the curve are b raked se lectively as needed.
This a llows more prec ise driving in c urves. The
applicable system may not activate when driv­ ing i n wet or snowy conditions.
A WARNING
- The ESC and its integrated systems can­
not overcome the laws of physics. This is
especially important on slippery o r wet
roads . If the systems begin acting to sta·
b iliz e your veh icle, you s hou ld immed i­
a tely c ha n ge your speed to match the
road and traffic cond itions. Do not let
the increased safety provided by these
systems tempt you to take risks. Do ing
so will increase the risk of a loss of vehi­
cle control, collision and serious personal
inj uries.
-Always adapt your speed to road, traffic and weather conditions. The risk of los­
ing control of the vehicle increases when
d riving too fast, espec ially through
curves and on slippe ry or wet roads, and
when dr iv ing too close to vehicles up
ahead. The ESC a nd its integrated sys­
tems canno t always p reven t collisions -
there is still a risk of acc idents!
- Always accelera te wi th spe cial care on
even, smooth s urfaces such as those that
are wet or covered with ice and snow.
The drive wheels can spin even with these assistance systems that cannot al­
ways he lp to red uce the risk of loss of ve­
h icle control.
(D Tips
- ABS and ASR only work cor rectly when
all four wheels are equipped with identi­
cal tires. D ifferent tire sizes can lead to a
reduction in engine power .
- Yo u may hear noises when the systems
descr ibed are working.
- If the ind icator light
DJ or ml (USA
mode ls)l iiJ (Canada models) appears,
there may be a malfunction<=>
page 18,
<=>page 19 .

190 Intelligent technology
overheat re ducin g the effectiveness of
the ent ire brake system.
- Failure of one brake circuit will impair
the braking capability resulting in an in­
creased stopp ing distance. Avoid driv ing
the vehicle and have it towed to the near­ est author ized Audi dealer or qualified
workshop .
- Never let the vehicle ro ll to a stop w ith
the engine shut off.
- If the brake booster is not working, the
brake pedal must be pressed conside ra­
bly harder to make up for the lac k of
booster assistance.
Electro-mechanical
power assist, dynamic
steering
The electro-mechanical power assist helps
the driver when steering.
Power stee ring adapts electronically based on
the vehicle speed.
Indicator lights and messages
• Steering defective! Do not drive vehicle!
If this ind icator lig ht tu rns on and stays on
an d th is message appears, t he power steer ing
may have f ailed.
D o
not cont in ue d riving. See yo ur autho rized
Aud i deale r or a q ua lifi ed r epa ir facility for as­
sistance.
'1:I Dynamic steering : System fault! You can
cont inue driv ing
If the indicator light t urns on and the mes­
sage appears, the steer ing may be more diffi­
cul t to move or more se nsitive than usual. The
steer ing wheel may also be at an angle whe n
d riving straight .
Drive s low ly to your author ized Audi dealer or
q ua lified workshop to have the malfunction
cor rected .
'y.ij Dynamic steering: initializing
If this driver message appears and the indica ­
tor light is f lashing on the instrument panel,
dynam ic steer ing * is being re in it ia lized. After
starting the engine, the steering wheel will move s light ly. Re- initialization might be nec­
essary if the steering wheel was moved hard
to the left and right wh ile the vehicle was not
moving . Th e display goes out as soon as ini ti­
ali za tion is complete.
_& WARNING
Ha ve the dy namic stee ring * system m al­
f u nction repa ired as soon as possib le by an
a uthorized Audi dea ler or qua lified work ­
shop -risk of acc ident !
@ Tips
-If the . or '1:I indic ator li ght only s tays
on fo r a shor t time, you m ay continue
dr iving.
- T he dynamic s teering * stabi lit y syste ms
are no t av ail ab le in the even t of a system
ma lf u nction.
- F or ad di tion al information on dynamic
steering *, refe r to
¢page 115 .
-
Driving with your
quattro
App lies to vehicles: wi th all-w hee l drive
With a/I-wheel drive, all four wheels are driv­
en .
General information
With a ll-wheel d rive, power is distr ib uted to
all four wheels. This happens automatically
depending on your driving style and the road
co ndit ions at the time . See also
¢ page 185.
A center d ifferential distributes the driving
power variably to the front and rear axle. It
wor ks together with selective w heel torque
co ntrol, wh ich activates when dr iving t hrough
c ur ves
c::;,page 186. With the sport differe n­
t ia l* , pow er d istr ibut ion to the rea r wheels is
variable a nd can be adjusted w ith drive se lect
c::;, page 115. .,..

-If you notice unusual vibra­tion or if the vehicle pulls to one side when driving, al­
ways stop as soon as it is safe to do so and check the
wheels and tires for dam­ age.
(D Note
-Please note that summer and winter tires are de­
signed for the conditions
that are typical in those sea­
sons. Audi recommends us­ing winter tires during the
winter months. Low tem­ peratures significantly de­
crease the elasticity of
summer tires, which affects
traction and braking ability.
Tires and wheels 229
If summer tires are used in
very cold temperatures, cracks can form on the tread bars, resulting in perma­
nent tire damage that can
cause loud driving noise and unbalanced tires. Audi is not
responsible for this type of
damage.
-Burnished, polished or chromed rims must not be used in winter road condi­
tions. The surface of the
rims does not have suffi­
cient corrosion protection
for this and could be perma­
nently damaged by road salt
or similar substances.
•
•
'
Glossary of tire and loading terminology
Accessory weight
means the combined weight (in
excess of those standard items
which may be replaced) of auto­ matic transmission, power
steering, power brakes, power
windows, power seats, radio, and heater, to the extent that
these items are available as fac­
tory-installed equipment (whether installed or not).
Aspect ratio
means the ratio of the height to
the width of the tire in percent. Numbers of 55 or lower indi­
cate a low sidewall for im­ proved steering response and
better overall handling on dry
pavement.

M N
~ co
rl I.O
"' rl
"' rl
Right cockpit fuse assignment
Fig. 209 Right cockpit: fuse pane l wit h plastic cl ip
Fuse panel @ (black )
No . Consumer
Amps
5 Steering
column switch
5
modu le
7
Termina l 15 d iagnostic con-
necta r 5
8
Gateway (Databus diagnos-
5
tic interface)
9 Supplementary heater 5
Fuse panel@ (brown )
No .
Consumer Amps
1 CD/DVD player 5
2 Wi-Fi
5
3 MMI/Radio 5/20
4 Instrument cluster
5
5 Gateway
(instrument cluster
5
control module)
6 Ignition lock
5
7 Light switch
5
8
Climate control system
40
blower
9 Steering column lock
5
Fuse s and bulb s 2 71
No. Consumer
10 Climate
control system
11 Te
rm inal 30 diagnostic con-
n ectar
12 Steer
ing column switch
module
Right luggage compartment fuse
assignment Amps
10
10
5
F
ig . 210 Right luggage compartment: fuse panel w ith
plast ic cl ip
Fu se panel @ (bla ck)
No . Consumer Amps
2 Rear window heater (Ca b
rio-
30
let)
3 Power
top latch (Cabriolet)
30
4 Power top hydraul ics (Cab-
so riolet)
Fuse pan el@ (black )
No. Consumer Amps
Luggage compartment lid
1 control
module (allroad)/
30/10
Power top contro l modu le
(Cabriolet)
2 Re
tractable rear spoiler
10
(RS 5 Coupe)

"" N
0 ::.,: co ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
Index 291
-----------------------------------.......
Daytime running lights. . . . . . . . . . . . 49, 50
Declaration of compliance Adapt ive cruise control .... .. .. .. .. . 286
Aud i side assist .......... .. .. .. ... 286
Cell phone pa ckage ....... .. .. .. .. . 286
Conve nience key ... .... ... .. .. .. ... 286
Elect ronic immobilizer .. ... .. .. .. .. . 286
Homelink universa l remote contro l .. . 286
Remote control key ....... .. .. .. .. . 286
D ecora tive parts/ trim
C lean ing ... .... ...... ... .. .. .. ... 204
Defective light bulb warning . . . . . . . . . . . 2 1
Defrosting (windows) ....... .. .. .. .. .. 80
D etermi ning correct load limi t ... .. .. . 24 4
Dig ita l clock ........... ...... .... ... 12
Dig ita l compass . .. ..... ... .. .. .. .... 58
D imensions .. ............. .... .. ... 28 1
Dimming the rearview mirror . . . . . . . . . . 53
D isp lays
C leaning ... .. .... .... ... .. .. .. ... 204
D oors
C hi ld safety loc ks ......... .. .. .. .. .. 41
emergency loc king ........ .. .. .. .. .. 3 7
Driver information system Enhanced sh ift indicato r .... ... ... ... 27
Open doo r or front lid warning . . . . . . . . 23
Outside temperat ure display .. .. .. .. .. 23
Sound system display . . . . . . . . . . . . . . . 23
Driver seat
refer to Seat ing pos ition 127
Driving off road ... ...... ... .. .. .. ... 197
D riving safe ly ............. .... .. ... 126
Driving through water . . . . . . . . . . . . . . . 193
D riving time . . . . . . . . . . . . . . . . . . . . . . . . 24
Dust filter
refer to Po llutant filte r (automatic A/C
system) .. .. ............. .... .. .. .. 78
Dynamic steering . . . . . . . . . . . . . . 115 , 190
E
E85 (Fue l) . .. ............. .... .. ... 208
E ffi ciency program . . . . . . . . . . . . . . . . . . . 26
Fu el economy messages . . . . . . . . . . . . . 28
M emory leve ls . . . . . . . . . . . . . . . . . . . . . 24
Othe r equipment . ..... ... .. .. .. .. .. 27
Shift indicator ........... .. .. .. .... 27 E
lectro -mechan ica l power ass ist ... .. .. 190
E lectromechanical pa rk ing brake
E mergency bra king ................ . 89
Ind icator lig ht . .. .... ........... .. . 87
Parking ... .. .. .. ................. . 88
Re leas ing and closing ... .... ... .. .. . 87
Starting assist ...... .. .. ..... ... .. . 88
Starting from rest . ... .. .... ... .. .. . 88
Starting off w ith a trailer ........ .. .. . 89
Warning/ind icator lights ............. 16
E lectronic differential lock
Warning/indicator lights ..... ... .. .. . 18
El ectronic d ifferential lock ( EDL) ... .. .. 185
Wa rning/ind icator lights ........ .. .. . 19
E lectronic immob ilizer . . . . . . . . . . . . 12, 37
E lectronic power con trol
(EPC) warning/indicator light . . . . . . . . . 20
El ectronic speed limi ter ............... 30
E lectronic stab ilizat ion contro l
offroad mode . . . . . . . . . . . . . . . . . . . . . 187
Sport mode . . . . . . . . . . . . . . . . . . . . . . 187
E lectronic Stabilization Contro l (ESC) ... 185
Warning/ind icator lights ............. 18
Emergency ac tua tion
Doors . ... .. .... ... .. .. ..... ... .. . 37
Ignition key ..... .. . .. .. ..... ... .. . 34
Rea r lid . . . . . . . . . . . . . . . . . . . . . . . 40, 41
Slid ing/ti lting s unroof ............... 44
E merge ncy br aking . .... ......... .. .. . 89
Emergency flasher ..... .. .... .... ... . 51
w . /' d' l' h arnmg m 1cator 19 ts . . . . . . . . . . . . . 22
Emergency key .. ................... . 32
Starting engine ............... .... . 84
Emergency operation Emergency bra king funct ion (parking
brake) . ... .. .... .. . .. .. ..... ... .. . 89
E mergency starti ng ................. 274
Emergency towing .................. 276
Energy management .. .. ..... ... .. .. 191
Battery power ... .. . ... .... ... .. .. . 16
Driver notification . .. .. ..... ... .. .. . 16
En gine
Compartment .. ................... 214
Coolant ... .. .. .... .. ... ..... ... .. 218
Data ... .. .. .... .. . .. .. ..... ... .. 282
Hood ... .. .. .... .. . .. .. ..... ... .. 212
Starting . . . . . . . . . . . . . . . . . . . . . . 82, 85
•
•

29 6 Index
Parking system ........... ... .. .... . 118
Rear .. .... ................ ..... . 118
Rear, with rear v iew camera ... .. .... . 120
Park ing system (rear) ................ 118
Ad justing the warning tones .. .. .... . 119
Parking system (rear, w ith rear view cam-
era) Park ing mode 1 ................... 122
Parking mode 2 ................... 123
Safety precautions ................. 120
Switching on/off ............. .... . 121
Switching rear view camera on/off ... . 124
Part it ion net . . . . . . . . . . . . . . . . . . . . 72, 73
Parts replacement .................. 285
Pass-t hrough ............... ... .... .. 75
PASSENGER AIR BAG OFF light ... .. .. . 155
Passive safety system ........... .... . 126
Pedals .. .. .. ................ ... .. . 131
Physical principles of a frontal collision 137
P lastic parts
C leaning ... ................ ..... . 204
Polishing .. .... .............. ...... 204
Pollutant filter (automatic A/C system) .. 78
Power seat adjustment . . . . . . . . . . . . . . . . . . . . 62
Power locking system . . . . . . . . . . . . . . . . . 31
E mergency locking .................. 37
Power windows .................... 42
Rear lid . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Selective unlock feature .... ..... .. .. 36
Settings ... ................ ..... .. 36
Sliding/tilting sunroof ............... 42
Power steering
refer to Electro-mechanical power as-
sist .. ... ................ ... .... . 190
Power window
Conven ience opening/closing . .. .... .. 42
Power windows .............. .. .... .. 42
Child safety locks .............. ..... 42
Malfunct ions ............. .... ..... 43
Pregnant women
Special considerations when wearing a
safety belt ............... ... .. .. . 141
Proper occupant seating positions .... . 127
Proper safety belt pos it ion . . . . . . . . . . . . 140 Proper
seating position
Front passenger .. ................ . 128
Occupants ... .. .. .. .............. . 127
Rear passengers .. ............. .... 129
Protecting ......................... 204
Protective liner . . . . . . . . . . . . . . . . . . . . . . 76
Q
Quartz clock . . . . . . . . . . . . . . . . . . . . . . . . 12
quattro
refer to all-wheel drive .......... ... 190
Question What happens to unbelted occupants? 137
Why safety belts? . . . . . . . . . . . . . . . . . 136
R
Radiator fan .. .. .. ............. .... 220
Rain/light sensor
Headlights ...... ............ .... .. 49
Intermittent (windshield w ipers) ...... 55
Sensor defective . . . . . . . . . . . . . . . . . . . . 22
Reading lights . . . . . . . . . . . . . . . . . . . . . . . 52
Rear door sun shade . . . . . . . . . . . . . . 54, 55
Rear fog lights .. .. ... .... ........ .. . 49
Rear lid Automatic operation ................ 39
Emergency re lease . . . . . . . . . . . . . . 40,
41
Escape handle ... ............. ..... 41
Opening and closing .............. .. 38
Rear light Defective . . . . . . . . . . . . . . . . . . . . . . . . . 21
Rear view camera
Parking mode
1 ................... 122
Parking mode 2 .. ................ . 123
Rear view mirror ................... .. 53
Rear window heating ............ ..... 80
Rear window sun shade . . . . . . . . . . . . . . . 55
Rear window washer system ......... .. 55
Recircu lation mode (automatic climate
control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Refuell ing ......................... 210
Release lever for hood ............... 212
Remote contro l
Garage door opener (Home link) ...... . 45