2011 AUDI S8 heating

84 On the road
Cruise control
Switching on
The cruise control system makes it possible to
drive at a constant speed starting at 20 mph
(30 km/h).
0
f
®t
0
Fig. 83 Control lever w it h set butt on
Fig . 84 D is pl ay: Selected speed
"' Pull the lever to position (D c::> fig. 83 to
switch the system on.
"' Drive at the speed you wish to set.
"'Press button@to set that speed .
I :i:. ... a,
The stored speed and the ind icator light
[ij;W~1~ (US models) / 0 (Canadian models) ap ­
pear in the instrument cluster display
c:;, fig. 84 . The display may vary, depending on
the type of display in your vehicle . The indic a­
tor light . in the instrument cluster also illu­
minates.
The speed is kept constant
via an engine out­
put adjustment or active brake intervention .
8_ WARNING
-Always pay attention to traffic even when
the cruise control is switched on . You are
always responsible for your speed and
the distance between your vehicle and
other vehicles. -
For safety reasons, the cruise contro l
should not be used in the city, in stop­
and-go traffic, on twisting roads and
when road conditions are poor (such as ice, fog, gravel, heavy rain and hydro­
plan ing) - risk of accident.
- Turn off the cruise control temporarily when enter ing turn lanes, highway exit
lanes or in construction zones .
- Please note that inadvertently "resting" your foot on the accelerator pedal causes
the cruise control not to brake. This is
because the cruise control is overridden
by the drive r's acceleration.
- If a brake system malfunction such as
overheating occurs when the cruise con­
trol system is switched on, the braking
function in the system may be switched
off . The other cruise control functions re­
main active as long as the indicator light
m:lmi (US models)/ . (Canadian mod­
els) is on.
(D Tips
The brake lights illuminate as soon as th e
brakes decelerate automatically.
Changing speed
"' Press lever in the 0 or O direction
c::>page 84, fig. 83 to increase or decrease
your speed.
"' Release the lever to save that speed .
Change speed in increments of 1 mph (1 km/
h) by lightly press ing the lever. If you keep the
lever pressed down , you will alter your speed
in 5 mph (10 km/h) increments .
You can also press the accelerator pedal down
to increase your speed, e .g. if you want to
pass someone . The speed you saved earlier
will resume as soon as you release the acceler­
ator pedal.
If, however, you exceed your saved speed by
6 mph (10 km/h) for longer than 5 minutes,
the cruise control will turn off temporari ly.
The green symbol in the display
c> page 84, .,..

ESP includes and/or works together with the
anti-lock brake assist system (ABS), brake as­
sist system, anti -slip regulation (ASR), elec­
tronic differential lock (EDL), dynamic steer­
ing* and electronic interaxle differential lock*.
ESP is switched on all the t ime . In certa in sit­
uations when you need less traction, you can
sw itch
off ASR by pressing the button above
the selector lever. Be sure to switch ASR on
again when you no longer need less traction.
Anti-lock braking system (ABS)
ABS prevents the wheels from locking up
when braking. The vehicle can still be steered even during hard braking . Apply steady pres­
sure to the brake pedal. Do not pump the ped­
al. A puls ing in the brake pedal indicates that
the system is he lping you to brake the vehicle.
Brake assist system
The brake assist system can decrease brak ing
distance.
It increases braking power when the
driver presses the brake pedal quickly in emer­
gency situations. You must press and hold the
brake pedal until the situation is over. In vehi­
cles with adaptive cruise control*, the brake
assist system is more sensitive if the distance
detected to the vehicle ahead is too small.
Anti-slip regulation (ASR)
ASR reduces engine power when the drive
wheels begin to spin and adapts the force to
the road conditions. This makes it easier to
start, accelerate and drive up hills .
Electronic differential lock (EDL)
The EDL brakes wheels that are spinning and
transfers the drive power to the other drive
wheel or whee ls if the vehicle is equipped with
a ll whee l drive *. This function is available up
to about 75 mph (120 km/h).
I n extreme cases, EDL automatically switches
off to help keep the brake on the braked wheel
from overheating . EDL will switch on again au­
tomatically when conditions have returned to
normal.
Intelligent technology 191
Dynamic steering*
On vehicles with dynamic steering, ESP helps
stabilize the steering in certain situations.
Electronic interaxle differential lock
function*
T he electronic interaxle differential lock func­
tion activates when driving th ro ug h curves.
Braking is targeted toward the wheels on the
inside of the curve as needed. This he lps to
minimize front whee l skid, improves traction
and allows for more precise driving through
curves .
A WARNING
- ESP, ABS, ASR, EDL, dynamic steering*
a nd the electronic interaxle differential
loc k fu nction* cannot overcome the laws
of physics. This is especially impo rtant
on slippery or wet roads.
If the systems
begin acting to stabilize your vehicle, you
should immediately change yo ur speed
to match the road and traffic conditions .
Do not let the increased safety provided
by these systems tempt you to take risks.
Doing so will increase the risk of a loss of
veh icle contro l, collision and ser ious per­
sonal injur ies.
- Always adapt your speed to road, traffic
and weather conditions. The risk of los­
ing con trol of the vehicle increases when
driving too fast, espe cially through
curves and on slippery or wet roads, and
when dr iving too close to vehicles up
ahead. ESP, ABS, the brake assist system,
EDL, ASR, dynam ic steer ing* and the
electronic interaxle differentia l lock func­
tion* cannot prevent collisions.
- Always accelerate with special care on
even, smooth surfaces 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 reduce the risk of loss of ve­
hicle contro l.
-
•
•

196 Intelligent technology
What you should know
The highest priority is given to maintaining
starting capability.
The battery is severely taxed in short-distance
driving, in city traffic and during the cold time
of year. Abundant electr ical energy is re­
qu ired, but only a little is generated. It is also
cr itical if the e ngine is not run ning and elect ri­
cal components a re turned on. In th is in­
stance energy is being consumed but none is be ing generated .
I t is in precisely these situations that you w ill
notice energy managemen t actively regulat ­
ing the distrib ution of energy.
Vehicle stands for an ext ended period
If you do not drive your vehicle over a period
of severa l days or weeks, elect rical compo­
nents are grad ually cu t back o r switched off .
This reduces energy co nsu mption and main­
tains starting cap abili ty
over a longer period.
Be aware that when you unlock you r vehicle,
some of the conve nience funct ions may not
ope rate, such as the Convenience key , the re­
mote cont ro l or the power seat adjustment .
The convenience functions will be availab le
aga in when you switch on the ignition and
start the engine .
With the engine turned off
If yo u lis ten to the radio, for example, with
the eng ine turned off or use othe r MM I fu nc­
tions, the battery is being discharged .
I f sta rting capability is jeopa rdized due to e n­
e rgy consumpt ion, the fo llow ing warning ap­
pears in the MMI disp lay :
Please start th e engine soon or th e syst em
will be turned off .
The warning ind icates that the system will be
turned off automatically after 3 m inu tes .
If
you wish to cont inu e us ing the functions , you
have to start the engine.
With the engine running
Although e lec trical energy is generated when
the vehicle is being driven, the battery can be ­
come discharged. This happens mostly when
li ttle energy is being generated and a g reat
deal consumed and the battery's state of
charge is not optimal.
To b ring the energy ba lance back into equili­
brium, consumers which req uire especially
l arge amounts of energy are temporar ily cut
back or sw itched off. Heat ing systems i n par­
ticular require a great deal of energy. If you
notice , for example, that the heated seats* o r
the heated rear window are not heating, they have been temporarily cut back or sw itched
off . These systems w ill be available again as
soon as the ene rgy balance has been restored.
You w ill also notice that engi ne idle speed has
been increased slightly . Thi s is normal and not
a cause for con ce rn. By inc reas ing eng ine id le
speed the addi tional energy requ ired is gener­
ated and the battery is charged.

198 Driving and en vi ro nment
Catalytic converter
It is very important that your emission con­
trol system (catalytic converter) is function­
ing properly to ensure that your vehicle is run­
ning in an environmentally sound manner .
.. Always use lead-free gasoline¢ page 218,
Fuel supply.
.. Never run the tank down all the way to emp-
ty .
.. Never put too much motor oil in your engine
¢ page 22 7, Adding engine oil 't=r. .
• Never try to push- or tow-star t your veh icle.
The catalytic converter is an eff ic ient "clean­
up" device built into the exhaust system of
the vehicle. The catalytic converter burns many of the pollutants in the exhaust gas be­
fore they are released into the atmosphere.
The exclusive use of unleaded fuel is critically
important for the l ife of the cata lytic conve rt­
e r and proper functioning of the engine.
& WARNING
-
- Do not park o r operate the vehicle in
areas where the hot exhaust system may
come in contact with dry grass, brush,
fuel spill or other material which can cause a fire.
- Do not apply additional undercoating or
rustproofing on or near the exhaust
man ifold, exhaust p ipes, catalytic con­
verter or heat shie lds . During driving, the
substance used for undercoating could
overheat and caus e a fire .
@ Note
-Be aware that just one tank filling with
leaded fuel will already seriously de­
grade the perfo rmance of the catalytic
conve rter .
- Do not exceed the correct engine oil leve l
¢page 227.
-Do not drive until the fuel tank becomes
completely empty. The eng ine could mis­
fire . Un burned f uel could a lso get into the exhaust system and th
is co uld cause
the cata lytic converter to overheat .
- Do not switch
off the ignition while the
vehicle is moving .
- Do not continue to ope rate your veh icle
under these conditions, as otherwise fuel
can reach the catalytic converter. This
cou ld result in overheating of the con­
verter, requir ing its replacement .
- To assure efficient operation of the Emis ­
sion Control System:
- H ave you r vehicle maintained properly
and in accordance w it h the service rec­
ommendat ions in your Warranty &
M ain tenance boo klet.
- L ack of prope r maintenance as we ll as
improper use of the vehi cle will impair
the function of the em ission contro l
system and could lead to damage .
@ For the sake of the environment
Even when the Emiss ion Control Sys tem is
operat ing proper ly, the exha ust gas can
have a sul fur -li ke ex haust gas smell under
some operating states . This depends on
the sulfur content of the fuel being used .
Using a different brand of fue l may help,
or f il li ng the tank with lead-free super
grade gasoline .
Avoid damaging the
vehicle
When you are d rivi ng on poor roads, or over
c u rbs, steep ramps, etc., ma ke certai n that
low- ly ing parts s uch as spoilers and exha ust
system parts do not bottom o ut and get dam ­
aged.
T his is es peci ally true for ve hicles with low­
s lung chassis (spor ts chassis)* and fully load­
ed vehicles .

200 Driving and en vi ro nm ent
Avoid full throttle
Driving at moderate speeds saves fuel and
improves your mileage .
"'Try and keep well below your car 's maximum
speed.
Accelerating gently reduces fuel consump­
tion, engine wear, and does not disturb the
environment. F ue l consumption, exhaust em issions and en ­
gine noise increase disproportionately at high
speeds. If you drive at approximately three
quarters of top speed, fue l consumption will
be reduced by one half. Never drive faster
than the posted speed limit and weather con­
d itions permit .
Reducing unnecessary idling
Even when your car is just idling it burns up
fuel.
"'Shut the engine off when you are not driving
the vehicle .
"'Do not warm up the veh icle by letting the
engine run at idle .
It makes sense to shut
off the e ngine in traff ic
jams, when waiting for trains to pass at ra il­
road crossings , or at traff ic lights that have
long wa its on red. Turning the engine
off fo r
just
30-40 seconds saves more fue l than is
burned s tarting the eng ine again .
It takes a long time for the engine to warm up
fully when it is running at idle . Howeve r, wear
and noxious em issions are especially high
when the engine is warming up. So you should
drive away as soon as you start the engine and
avoid running at high rpms while the engine is
still warming up .
([) Note
Do not leave engine idling unattended af ­
ter starting . If warning lights should come
on to indicate improper operation, they
wou ld go unheeded. Extended idling also
produces heat, which cou ld result in over- heating or other damage to the vehicle or
other property .
Regular maintenance
A badly tuned engine unnecessarily wastes a
lot of fuel.
"' Have your ve hicle serviced at reg ular inter -
vals.
By having your veh icle regu larly serviced by an
Audi dealer he lps to ensure that it runs p rop­
erly and economically. The condition of your
vehicle not only affects its sa fety and ability to
hold its value, it also affects
fuel c onsump­
tion .
Check your oil e ach time you fill your t ank .
The amount of oil used is related to engine
load and speed .
It is normal for the oil consumption of a new
engine to reach its lowest value after a certa in
mileage has been driven.
You must drive your veh icle about 3,000 m iles
(5,000 kilometers) before you can properly
assess oil consumpt ion.
This also app lies to fue l consumption and en­
gine output.
(D Note
- Have your vehicle maintained proper ly
and in accordance with the service rec ­
ommendations in your Warranty
& Main­
tenance booklet. Lack of proper ma inte­
nance as well as improper use of the ve­
hicle will impair the function of the
em iss ion contro l system and cou ld lead
to damage.
- Do not alter or remove any component of
the Emission Control Sys tem unless ap­
proved by the manufacture r.
- Do not alte r or remove any device, such
as heat sh ie lds, switches, ign it ion w ires,
valves, which are designed to protec t
your vehicle's Emission Control System
and other impo rtant vehicle compo­
nents .

Engine cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro ­
te cts the engine from freezing in the winter .
The cooling system is sealed and generally re­
qu ires little attention .
The cooling system has been filled at the fac­
tory with a permanent coolant which does not need to be changed. The coolant consists of a
mixture of water and the manufacturer's gly ­
col-based coolan t additive G12++ ant ifreeze
with a nticorrosion add itives (50% fo r USA
models; 60% for Canad ian models). This mix­
ture bot h assu res the ne ces sary frost protec­
tion and protects metal components in the
engine's cooling system from corrosion and
scaling. It also raises the bo ili ng po int of t he
coolant.
D o not red uce the concentration of the coo l­
ant in the summe r by adding plain water .
The
proportion of coolant addit ive must be at
least 50% but not mo re than 60 %
to main­
tain antifree ze protection and cooling efficien­
cy. If the coolant frost protect ion is too low,
the coolant could freeze and damage the veh i­
cle heating and eng ine cooling system .
For year-round driving, antifree ze is added at
the factory for temperatures down to:
- -3 1°F (-35°C)USA
- -4 0 ° F ( - 4 0 °C) Canada.
You can mix t he G12 ++ cool ant ad ditive with
o ther addit ives (G1 2+ or G1 2). Alway s check
w ith your author ized Audi dealer.
& WARNING
Before yo u check any thing in the engine
compartment, always read and hee d all
W AR NIN GS
Q .&. in Working in the engine
compartment on page 222.
(D Note
- Before win ter se ts in , have the coolan t
checked to see if the coolant addit ive i n
Checkin g and fillin g 229
your vehicle is sufficient to meet the cli ­
mate conditions . This is especia lly impor­
tant if you live in a reg ion where t he win­
ter is extreme ly co ld. If necessary, in­
crease t he p ropo rtion of coo lant add itive
t o 60% .
- Whe n add ing coolant additive to your
cooling system , remember :
- W e re co mme nd usin g only cool ant ad­
dit ive G 12++ (check t he labe l) for your
vehi cle. This coolan t addi tive is ava ila­
b le at a uthorized Audi dea le rs . Othe r
types of ant ifreeze can significant ly re­
d uce co rrosi on protection. The res ult­
i n g corrosion can ca use a loss of co ol­
ant and ser io us eng ine damage .
- Do not add any type of rad iator leak seal­
ant to you r vehicle's eng ine c oolant .
Add ing radiator repair fl uid may adverse­
ly affect t he f unction and performance of
yo ur cooling sys tem and co uld resu lt i n
damage not covered by yo ur New Ve hicle
Li mi ted Warran ty.
Checking the engine coolant level
The engine coolant level can be chec ked with
a quick glan ce.
:!, MAX
% MIN
Fig. 180 En gin e compar tment: mark ings on t he coo l­
a n t expa nsion tank
Befo re you check a nyth ing in the eng ine com­
partment,
always read and heed all WARN­
INGS ¢.&, in Working in the engine compart­
men t on page
222 .
"' Switch off the ignition .
"' Read the engine coo lant level from the coo l­
ant expa nsion tank
Qfig . 180. Wit h a co ld
eng ine , the coo lant level s hou ld be between
1JJ>-

Fuse panel@ (brown)
No. Equ ipment
1 H eadlight contro l switch
I 2
Ignition lock (key identifica-
tion)
3
Rear door control mod ule
(driver's side)
5 Horn
6 Interior lights (head liner)
Steering column lever, mul-
8
tifunction steering wheel
controls, steering wheel
heating
10
Power steering column ad-
j ustment
11 Driver door control module
12
D iagnostic co nnector, light/
rain sensor
Power steering column ad-
justment
15
P ower stee ring, A/C com-
pr esso r
16 Brake booster (VS FSI)
Fuse panel © (black )
No. Equipment
1 F ront seat heating
2 Windshield wiper
3 Fr ont exterior lighting
4 Sun roof
5 Dr iver power window
6 Driver seat (pneumatic)
7 Panoramic sunroof
8 Dynamic steering
9 Fr
ont exterior lighting
I 10
Windshield/headlight *
washe r system
11
Rear power w indow (driver's
side)
12 Panoramic sunroof
Amp s
5
5
7,5 15
7,5
10/5
5
7,5 10
25
20
15
Amps
30 30
30
20
30
15
20 35
30
35
30
4 0
Fu se s and bulb s 269
Front passenger side cockpit fuse
assignment
Fi g. 2 07 Fro nt passe nger s id e co ckpit: f use pa nel w it h
plast ic brac ket
Fuse panel ® (black)
No . Equipment Amps
1 Anti-theft alarm system 5
2
Transmission control mod-
15 ule
3 Front climate control fan 40
4
Engine supply 35
6
Engine cont ro l module 5
7
Front passenger door con-7,5
t rot module
8
Fron t passe nger power w in-
30 dow
9 ESP control module 10
1 0
E S P cont ro l modu le 2 5
11
Right rear power window 30
12
Fron t passe nger seat 15

2 70 Fu ses and bulb s
Luggage compartment fuse assignment
Fig. 208 Luggage co mpar tment: fuse panel with plastic b racket
Fu se pan el A (black ) Fuse panel
@ (b lac k)
I
No.
Equ ipment Amps No
. Equipment
Amps .
l!l button, data logger, diag-
1 nostic con
nector, adaptive
5 10
Rear seat heating, refrigera-
5 j tor, interior rearview mirror
lighting system 11 Dynam
ic steer ing 5
2 Networking gateway
5 12
Selector lever, BCM-2
5
3 adaptive air suspension
5 13 Audi side ass
ist 5
4 Parking system 5 14 Engine control module
5
5 Steering column
lever
5 1
5 Starter 40
I 6 Suspension control system
5
sensor left headlight/Headlight
'
16
10/5
range control system
.
7 Belt tensioners, airbag con-
5
trol module Fuse pan el@ (red)
No. Equipment Amps
Heated washer fluid nozzles,
Homelink (garage door
8 opener), night vision system
5
control module, sport differ- 1
left reversib
le be lt tens ioner
25
2 II
R_ight reversible belt ten-
25
s1oner
ential, ioniser 3
Starter diagnos
is
5
9
Electromechan ica l park ing
5
brake con tro l module 4 DC/DC converter
7,5
5 Adaptive cruise control 7,5