power steering AUDI A8 2017 User Guide

Intelligent Technology
Intelligent Technology
Electronic Stabilization
Control (ESC)
Description
The ESC increases driving safety . It reduces the
risk of s lipping and improves driving stabi lity.
ESC detects critical situations such as when the
veh icle is oversteer ing and understeering or the
wheels are spinning. The vehicle is stabilized by
apply ing the brakes or reducing eng ine torque .
When ESC engages, the
Ji] ind icator light blinks
in the inst rument cluste r.
The fo llow ing systems are integrated in the ESC:
Anti -lock b raking system (ABS)
ABS prevents the whee ls from locking when brak­
i n g . The vehicle can sti ll be steered even d uring
hard brak ing. Apply steady press ure to the brake
pedal. Do not pump the pedal. A puls ing in the
brake pedal indicates that the system is acting to
stabilize the vehicle.
Brake a ssi st sy stem
The brake assist system can dec rease braking dis­
tance. It increases brak ing power when the driver
presses the brake pedal quick ly in emergency sit­
uations . You must press and hold the brake pedal
until the dangerous situat io n is over . In veh icles
w ith adapt ive c ruise control*, the bra ke assis t
system is more sensitive if the distance detected
to the veh icle dr iv ing ahead is too small. On
ve hicles w ith act ivated and functi oni ng night vi­
sion assist*, the brake assist system can respond
more sensit ively if there is a warning .
Anti-slip regulation (ASR)
A SR red uces eng ine power when the d rive wheels
begin s pinning and ad apts the force to the road
conditions. This makes it easier to sta rt, acceler ­
ate and dr ive up hi lls.
Electronic differential lock (EDL )
EDL applies the brakes to a wheel that sta rts
sp inning and t ransfe rs t he d rive powe r to t he
o ther d riving w heels. This f unct ion is not av aila ­
b le at higher speeds .
126
In extreme cases, ED L automat ically switches off
to keep the b rake on the braked whee l from over­
heating. The veh icle is still working correct ly. ED L
will switc h on again automatically when condi­
tions have returned to normal.
Steering recommendat ion
The E SC he lps to stabili ze the vehicle by changing
the steering torque.
I n veh icles with dyna mic steer ing*, ESC a lso
helps to sta bilize the s teer ing in cr it ica l situa ­
tions.
Selective wheel torque control
Se lective wheel to rque cont rol is used when d riv­
i ng on curves.
The fro nt wheel on the ins ide of the curve or bo th
whee ls on the inside of the curve are braked se­
l ectively as needed. This allows more pre cise d riv­
i ng in cu rves. The applicab le system may no t ac ti­
vate when dr iv ing in we t or snowy condi tio ns.
Automatic post -collision braking system
The "automat ic post-coll is io n braking system"
can help to reduce the risk of sl iding and of addi­
tiona l co llisions after an acc iden t. If the a irbag
c ontro l modu le detects a collision above a cer tain
vehicle speed, the ve hicle is braked by the ESC.
The veh icle does not b rake automatically if:
- the drive r presses the acce lerator pedal, or
- the bra king force generate d by the pressed
brake pedal is greater than the b raking force
that would be in itiated by the system, or
- the ESC, the bra ke system or the vehicle electri­
cal system are not functioning.
A WARNING
- The ESC and its integ rated systems can not
overcome the lim its imposed by natura l
p hys ica l laws. Th is is es pec ially impor tan t
on s lippery or wet roads. If the system s be­
g in a cting to stabilize yo ur vehicle, you
should immedi ately alte r your speed to
match the road and tra ffi c conditions. Do
not let t he i ncreased safety provi ded tempt

0 co .... N ,..._
N .... 0 0 :c ' -New brake pads do not achieve their fu ll
brak ing effect during the first 250 mi
(400 km). They must be "broken in" first.
However, you can compensate for the
sl ightly reduced braking force by pressing
firmly on the brake pedal. Avoid heavy brak­
ing dur ing the b reak-in per iod.
- Certa in weather and operat ing cond it ions
such as dr iving t hrough water, d riving in
heavy ra in or d riving after washing your ve­
hicle ca n impair the effectiveness of the
bra kes . In the w inter, ice may b uild up on
the brake pads, rotors and drums . Check
these components by braking carefu lly. Ap­
plying the brakes carefu lly several times
dr ies the brakes and removes ice bu ild-up.
- The effic iency of the brakes can also be im­
paired by driving for long st retches on roads
cove red w ith salt without using the b rakes.
Yo u can remove sa lt deposits from the
bra ke rotors and pads by caref ully applyi ng
the brakes severa l t imes .
- If the front spoiler is damaged or you install
another spoiler, ma ke sure the front wheel
bra kes are vent ilated prope rly. O therwise,
the br ake system could overheat, wh ic h re­
duces the ir effectiveness.
- Failure of a brake circui t impai rs b raking
perfo rmance, whi ch incre ases bra king dis­
tance . Avoi d driving the vehicle and have it
towed it to the nearest author ized Audi
dealer or authorized A udi Se rvice Facility .
- If the bra ke booster is not wor king, you will
have to press m uch ha rder on the bra ke
peda l to compensate for the lack of the
booster.
(D Note
- Never let the brakes "rub" by pressing the
pedal lightly when braking is not actually
necessary. This causes the brakes to over­
heat and inc reases braking d istance and
causes wear.
- Before driving downh ill a long distance on a
steep h ill, decrease your speed and select a
l ower gear. This makes use of the engine
braking effect and relieves the brakes . If Intellig
ent Technology
you need to bra ke ad ditiona lly, bra ke in in­
terva ls and not continuous ly .
(D Tips
- If the brake boos ter is not wor king, you
must press the brake peda l with much more
force than normal.
- If you retrof it your vehicle with a front spo il­
er, wheel covers or simi lar items, make su re
that the air f low to the front wheels is not
inter rupted. Otherwise the b rake system
can become too hot.
Electromechanical
steering., dynamic
steering
The electromechanical steering supports the
driver's steering movements.
Power s teer ing adapts electronically based on
the ve hicle speed .
Indicator lights and messages
• Do not dr ive vehicle: Steering defective
If this indicator light turns on and stays on and
t hi s message appears, the power steering may
have failed.
Stop the vehicle in a safe location as soon as pos­ s ible. Do
not cont inue drivi ng. See an authorized
Audi dealer or authorized Audi Service Fac il ity for
ass ista nce.
l;rj Steering: System fault You can continue
driving
If the indicator light turns on and the message
appears, the steering wheel may be more d iffi ­
cu lt to move or m ore sensitive than usual. The
steering wheel may also be at an angle when
driv ing stra ight .
Drive slowly to an a uthorized Audi dea ler or au­
thori zed Audi Serv ice Facility to have the mal­
funct ion corrected .
'T-ij Dynamic stee ring: Initializing
If the indicato r ligh t is blinking and this mess age
appe ars, dynamic steering* is be ing ini tialized. .,.
129

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The stee ring wheel will be easy to move after
starting the engine . Re-initialization might be
necessary if the steering whee l was moved hard
t o the lef t and right wh ile the vehicle was not
mov ing. The display turns off if the initialization
was successful.
(D Tips
- If the. or
1;:r- ij ind icator light only stays on
for a short time, you may continue driving.
- The dynamic steering stability systems
c> page 126 are not available in the event of
a system ma lfunction.
- For additional informat ion on dynamic
steering, refer to
c> page 110.
All wheel drive (quattro)
In all wheel drive, all four wheels are powered .
General information
In a ll wheel drive, the driving power is divided be­
tween a ll four wheels . T his happens automatical ­
ly depending on your driving behavior as well as
t he current road cond itions. Also see
c> page 126, Electronic Stabilization Control
(ESC) .
With the sport differential*, power distri­
bution to the rear whee ls is variable and can be
ad ju sted using the dr ive select
c> page 110.
The all wheel drive concept is designed for h igh
eng ine power. Your ve hicle is exceptionally pow­
erful and has excellent driving characterist ics
both under norma l dr iv ing condit ions and on
snow a nd ice. Always read and fo llow safety pre­
cautions
c> .&. .
Winter tires
By us ing all w heel d rive , yo ur vehicle has good
forward mot ion w ith standa rd t ires in winter con­
d itions . However, in winter we recommend us ing
w in ter o r all season t ires o n all fo ur wheels, be ­
cause this will improve the b raking effect .
Snow chains
If there are snow chai n laws, snow chains must
a lso be used on vehicles with all w heel d rive
c> page 298, Snow chains .
130 Replacing tires
Fo
r vehicles wi th a ll wheel d rive, o nly wheels with
the same ro ll ing circ umfe rence sho uld be used .
Avo id using tires with different tread depths
c> page 290, New tires or wheels .
Offroad vehicle?
You r A udi is not an off road vehicle -there is not
enough ground clearance. For th is reason, avoid
difficult terrain .
A WARNING
- Also, in ve hicles with all wheel drive, adapt
your driving sty le to the current road and
traffic conditions. Do not let the increased
safety provided tempt you into taking r isks,
because this increases the risk of an acc i­
dent.
- The braking ab ility of your vehicle is limited
to the traction of the wheels . In this way, it
is not different from a two wheel d rive vehi­
cle. Do not be tempted to accelerate to a high speed when the road is s lippery, be ­
c a use th is i ncreases the r is k of an accident.
- Note that on wet st reets, the front wheels
c a n " hydroplane " if driv ing at speed s tha t
are too high. Unlike front wheel drive
vehicles, t he engine does not rev higher sud ­
de nly when the vehicle begins hydroplan ing.
For this reason, adapt yo ur speed to the
road conditions to reduce the risk of an acci­
dent.
Energy management
The starting ability is optimized
The energy management system manages the
electrical energy distribution and optimizes the
availability of electrical energy for starting the
engine.
When a vehicle with a conventiona l energy sys­
tem is no t drive n for a long t ime, the veh icle bat­
te ry is drained by equ ipment (fo r example, the
i mmob ilizer). In certa in circ umstances, there
could may not be enough energy to start the en ­
gine.

C) C0 ....
"' " "' .... 0 0 :r Driver's side cockpit fuse assignment
Fig. 287 Driver side cockpi t: fuse panel with plastic bracket
Fuse panel @ (brown)
No. Equipment
1 Light switch
2 Eme rgency start coil (driver identification)
3 Left rear door control module
4 Head-up display
5 Horn
6 Interior lights (headliner)
Steering column lever, multifunction
8 steering whee l controls, steering wheel
heating
10 Power steering column adjustment
11 Driver door control module
12 Diagnostic connector, light/rain sensor
14 Power steering column adjustment
lS Power steering, A/C compressor
16 Brake booster
Fuse panel © (black)
No. Equipment
1 Front seat heating
2 Windshield wipers
Fuses and bulbs
Fuse panel © (black)
3
Front exterior lighting
4 Sliding/tilting sunroof
s Driver power window
6 Driver's seat (pneumat ic)
7 Panorama roof
8 Dynamic steering
9 Front exterior lighting
10 Windshield/headlight washer system
11 Left rear power window
12 Panorama roof
Front passenger side cockpit fuse
assignment
Fig. 288 Fro nt passenger side cockpit: fuse panel with
plastic bracket
Fuse panel @ (black)
No. Equipment
1 Anti-theft alarm system
2 Transmission control module
3 Front climate control fan
4 Engine supply
6 Engine control module
7 Front passenger door control module
323

Fuses and bulbs
Fuse panel @ (black) Fuse panel@ (black)
8 Front passenger power window 11 Right rear power window
9 ESC control module 12 Front passenger's seat (pneumatic)
10 ESC control module
Luggage compartment fuse assignment
F ig. 289 Luggage compar tment: fuse panel with p lastic brack et
Fuse panel @ (black) Fuse panel@ (black)
No. Equipment
l
ESC button , data logger, diagnostic con-
nector, BCM -1, adaptive light 10
Rear
seat heating, refrigerator, rearview
mirror
11 Electromechanical
steering
2 Networking gateway 12 Selector lever, BCM-2 voltage
3 adaptive air suspension
13 Side assist
4 Park ing aid 14 Engin e control module
5 Steering column lever 15 Starter
6 Suspension control system sensor
7 Belt tensioners, airbag control module 16
Left
headlight (headligh ts with adaptive
lig ht)/head light range control
Heated washer flu id nozzles, Home Link
8 (garage door opener) , night vision system
control module, sport differential, ionizer
9
Electromechan ical parking brake control
module
Fuse panel ® (red)
No. Equipment
l Left reversible belt tensioner
2 Right reversible belt tensioner
324