power steering AUDI A4 2015 User Guide

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

298 Index
Selector lever emergency release ..... . 100
Service and disposal Safety belt p retens ioner ... .. .. .... . 143
Service interval display ................ 28
Service position
refer to Replac ing wiper blades ... .. .. 57
SET button . . . . . . . . . . . . . . . . . . . . . . . . . 11
Shift indicator (efficiency program) ...... 27
Shutting down vehicle ............... 195
Side airbags Descr ipt ion . .............. ... .. ... 159
H ow they work ......... .. .. .. .. .. . 160
side assist
Adjusting the brigh tness . . . . . . . . . . . . 113
Sensor range ................. .... 112
Side assist Activating and deactivating . .. .. .. .. . 113
Cleaning the sensors ............... 203
Descr ipt ion .............. .. .. .. .. . 111
Side curtain airbags ....... ... .. .... . 162
Description .... ........... ... .... . 162
Howtheywork ............. .. .... . 163
Safety instructions .......... .. .... . 163
Side marker lights .......... ... .... .. 49
Ski sack .... ................... ... .. 75
Sliding/tilting sunroof
Conven ience opening/closing . .. ...... 42
Emergency closing ........ .. .. .. .. .. 44
Opening and closing ....... ... .... .. 43
Sunshade .................... ... .. 43
Snow chains ............... ... .... . 255
Socket 12-vo lt . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Sound system display . . . . . . . . . . . . . . . . . 23
Sources of informat ion about child re-
straints and their use ................ 183
Spare tire .. .. ............. .. .. .. .. . 260
Speedometer .... ...... ..... .. .. .. .. 12
Speed rating letter code ... .. .. .. .... . 250
Speed warn ing system .......... .. .... 89
Sport differential .......... .. .. .. .. . 115
Indicator lamp . . . . . . . . . . . . . . . . . . . . . 22
S TART ENG IN E STOP b utton (convenience
key) . ..... .. ... .. ..... ... .. .. .... .. 86
S TART ENGIN E STOP button (Conven ience
key) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Starting from rest
.. ... .. ..... .... . .. . 88
Starting
off w ith a trailer ............ .. 89
Starting the engine . . . . . . . . . . . . . . 82, 85
Stee ring
Locking the steering . .. ..... ... .. .. . 82
olso refer to Electro -mechanica l power
assist . ... .... .. .. ... ..... ... .. .. 190
Stee ring wheel
Adjust ing steering col umn ........... 82
Indicator light . . . . . . . . . . . . . . . . 18, 190
Steps for determin ing correct load limit . 244
Stopping the engine . . . . . . . . . . . . . . 84, 86
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Storage compar tments . . . . . . . . . . . 68, 76
S tronic . ... .... .. .. .... .... ... .. .. . 93
Se lector lever . . . . . . . . . . . . . . . . . . . . . . 94
S tronic transmission Emergency re lease ... .......... .. .. 100
Launch Control Prog ram ..... ... .. .. . 99
Su nroof ...... .. .. .. ... ....... ... .. . 43
also refer to Slid ing/ti lting sunroof 43, 44
Sun shades
Rear doors . . . . . . . . . . . . . . . . . . . . 54, 55
Rear window . . . . . . . . . . . . . . . . . . . . . . . 55
Sun visors . ..... .. .. ... ..... ... .. .. . 54
Symbols
refer to Warn ing/ indicato r lights . .... . 13
T
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . 11
Tail lights
Cleaning ......................... 203
T echnical modifications .. ..... ... .. .. 286
T ether anchors .. .................. . 181
Tether strap 181
T extiles
Cleaning .. .. .. .. ... .......... .... 205
T he first 1 ,000 miles (1,500 km) and after-
wards .. ... ... .. .. .. ... ....... ... .. 193
Tie-downs . . . . . . . . . . . . . . . . . . . . . 74, 133
t ipt ron ic . .. .. .. .. ............. .. ... 93
Automa tic Shift Lock (ASL) ... ... .. .. . 95
Driving ... .... .. .. ... ..... ... .. .. . 95
Emergency mode ... .... .... ... .. .. . 99
Manua l shift program .......... .... . 98
Se lector lever .. .. ... .......... .. .. . 94