2009 AUDI S8 ignition

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•
Closing the engine hood
- Pull the hood down until the pressure from the struts is
reduced .
- Let the hood
drop down and latch in place. Do not try to
push it shut;
it may fail to engage => &.
& WARNING
A hood that is not completely latched could fly up and block your
view while driving.
• When you close the engine hood, check it to make sure the
safety catch has properly engaged. The hood should be flush with
the surrounding vehicle body parts.
• If you notice while driving that the hood is not secured prop­
erly, stop at once and close it. •
Working in the engine compartment
Be especially careful whenever you work in the engine
compartment.
Whenever you must perform any work in the engine compartment,
for example checking and filling different fluids, there is a risk of injury, burns and accidents. To prevent personal injury always
observe the following WARNINGS. The engine compartment of any
vehicle is a hazardous area
~ & .
& WARNING
To help avoid injury, before you check anything under the hood :
• Turn off the engine.
• Remove the ignition key.
• Apply the parking brake .
& WARNING (continued)
• Move selector lever to "P" (Park).
• Always let the engine cool down. Hot components will burn
skin on contact.
• To reduce the risk of being burned, never open the hood if you
see or hear steam or coolant escaping from the engine compart­
ment. Wait until no steam or coolant can be seen or heard before
carefully opening the hood.
• Keep children away from the engine compartment .
• Never spill fluids on hot engine components. They can cause a
fire.
• Never touch the radiator fan. The auxiliary electric fan is
temperature controlled and can switch on suddenly.
• Never open the coolant reservoir cap when the engine is still
warm . The coolant system is pressurized and hot coolant could
spray out.
• Protect your face, hands and arm from steam or hot engine
coolant by placing a thick rag over the cap when you open the
coolant reservoir.
• If work on the fuel system or the electrical system is necessary :
- Always disconnect the battery.
- Never smoke or work near heaters or open flames . Fluids in
the engine compartment could start a fire.
- Keep an approved fire extinguisher immediately available.
• To avoid electrical shock and personal injury while the engine
is running or being started, never touch:
- Ignition cables
- Other components of the high voltage electronic ignition system.
• If you must perform a check or repair with the engine running: -First, fully apply the parking brake, move selector lever to "P"
(Park). .,
Vehicle care
I t •

Checking and filling -
------------------------------------------- -=----- =------
0 Note
• Before winter sets in, have the coolant checked to see if the
coolant additive in your vehicle is sufficient to meet the climate
conditions. This is especially important if you live in a region where
the winter is extremely cold. If necessary, increase the proportion of
coolant additive to 60%.
• When adding coolant additive to your cooling system,
remember:
-We recommend using only coolant additive G12+ + (check the
label) for your vehicle. This coolant additive is available at autho­
rized Audi dealers. Other types of antifreeze can significantly
reduce corrosion protection . The resulting corrosion can cause a
loss of coolant and serious engine damage .
• Do not add any type of radiator leak sealant to your vehicle's
engine coolant. Adding radiator repair fluid may adversely affect the
function and performance of your cooling system and cou ld result
in damage not covered by your New Vehicle Limited Warranty .•
Checking the engine coolant level
The engine coolant level can be checked with a quick
glance.
Fig . 269 Engine
compartment : Coolant
expansion tank
Before you check anything in the engine compartment,
always read and heed all WARNINGS==> & in "Working in
the engine compartment" on
page 309.
Turn off the ignition .
Read the engine coolant level from the coolant expan­
sion tank==> fig. 269. With a cold engine, the coolant level
should be between the "min" and "max" markings. When
the engine is warm, the level may be slightly above the
" max" marking .
The location of the coolant expansion tank can be seen in the
engine compartment illustration=>
page 310.
To obtain an accurate reading, the engine must be switched off .
The expansion tank in your vehicle is equipped with an electric
coolant level sensor.
When the coolant level is too low, the warning light in the Auto­
Check System =>
page 31 will blink until you add coolant and the
level has been restored to normal. Even though there is an electric
coolant level sensor, we still recommend you check the coolant level
from time to time.
Coolant loss
Coolant loss may indicate a leak in the cooling system. In the event
of coolant loss, the cooling system should be inspected immedi­
ately by your authorized Audi dealer. It is not enough merely to add
coolant.
In a
sealed system, losses can occur only if the boiling point of the
coolant is exceeded as a result of overheating.
& WARNING
The cooling system is under pressure and can get very hot. Reduce
the risk of scalding from hot coolant
by following these steps. ~
Vehic le care I I Technical data

Checking and filling 111111 _______________________________ =..:..:..::...:::...:...:~:....:...;_.:....::___--:::-------J
& WARNING !continued )
• Antifr eeze is po isonous. Always store antifreeze in it s original
c ontainer and well out of the re ach of children .
• If you drain the coolant, it must be caught and safely stored in
a proper co ntainer cle arly m arked "poi son ".
0 Note
• Coolant po llutes the environment and cou ld cause an engine
fire. Excess coolant will be forced out through the pressure relief
valve in the cap when the engine becomes hot.
• I f, in an emergency, only wa ter can be added, the correct ratio
between water and antifreeze=>
page 316 must be restored as soon
as possib le .
W For the sake of the environment
Drained coolant should not be reused. A lways dispose of used
coolant while observing all environ mental regula tions . •
Radiator fan
The radiator fan switches on au tomatically by i tself.
T he radiator fan is driven by the engine via the V-belt. The viscous
clutch regulates the speed of the fan according to the temperature
of the coo lan t.
An auxiliary electric radiator fan * switches on and off depending on
coolant tem perature and o ther vehic le opera ting condi tions.
After you switch the engine off , the auxiliary fan can continue
running for up to 10 minutes -even with the ignition off. It can even
switch on again later by itself=>&, if
• the temperature of the engine coolant rises due to the heat
bu ild -up from the engine i n the engine c ompar tment, or •
the engine compartment heats up because the vehicle is parked
in intense sunligh t.
& WARNING
• To reduce the ri sk of personal injury never touch the radiator
f a n .
• The aux iliary electric fan i s te mperature controlled and can
switch on suddenly even when the engine is not running .
• The au xiliary radiato r fan switche s on automatic ally when th e
eng ine coolant reache s a certain temperature and
will continue to
r un until the coo lant tempe rature drop s. •
Brake fluid
Checking brake fluid level
T he brake fluid level can be checked with a quick glance.
-w ;:;
Fig . 270 Engin e
c o mpartm ent: B ra ke
fluid r ese rvo ir
Before you check anything in the e ngine comp artmen t,
always read and heed all WARNINGS:::::> & in "Working in
t h e engi ne compartment" on
page 3 09. .,_
Vehicle care I I irechnical data

Checking and filling -
---------------------=----"=---------
checked by a service facility. The electrolyte level should also be
checked each time the battery is charged =>
page 323.
Have the battery checked when you take your vehicle in for service.
You are well advised to replace a battery that is older than 5 years.
With certain types of airbag deployment, the battery is discon­
nected from the vehicle electrical system for safety reasons=>.& in
"Repair, care and disposal of the airbags" on
page 234.
Disconnecting the battery terminals
Some vehicle functions (power window regulators, for example) are
lost if the battery terminals are disconnected. These functions have
to be relearned after the battery terminals are connected again. To
prevent this, the battery should only be disconnected from the
vehicle electrical system when absolutely necessary for repairs .
Vehicles not driven for long periods If you do not drive your vehicle over a period of several days or
weeks, electrical components are gradually cut back or switched off.
This reduces energy consumption and maintains starting capability
over a longer period
=> page 276.
Be aware that when you unlock your vehicle, some of the conve ­
nience functions may not operate, such as the Convenience key*,
the remote control or the power seat adjustment. The convenience
functions will be available again when you turn on the ignition and
start the engine.
Winter operation During the winter months, battery capacity tends to decrease as
temperatures drop. This is because more power is also consumed
while starting, and the headlights, rear window defogger, etc., are
used more often.
Avoid unnecessary power consump tion, particularly in city traffic or
when traveling only short distances. Let your authorized Audi dealer
check the capacity of the vehicle battery before winter sets in
=> page 323. A well charged battery will not only prevent starting
problems when the weather is cold, but will also last longer.
[ i] Tips
If your vehicle is left standing for several weeks at extremely low
temperatures, the vehicle battery should be removed and stored
where it will not freeze. This will prevent it from being damaged and
having to be replaced.•
Working on the battery
Be especially careful when working on or near the battery.
Fig . 271 Luggage
compartment: Right·
side storage compart­
ment
Fig . 272 Luggage
compartment : Battery
The battery is located in the luggage compartment on the
right side behind a cover. Before you check anything in the
luggage compartment,
read and heed all WARNINGS=>& . .,_
Vehic le care I I irechnical data

-Checking and filling PW~--=----=----------------
-To open the side storage compartment, turn the two pins
@ ~fig . 271 to the vertical position.
The positive(+) battery terminal is protected by a plastic cover . This
cover must be removed to access the positive(+) terminal when
connecting jumper cables to start the eng ine.
Always heed the safety warnings , when working on the vehicle
battery or the vehicle electrica l system to prevent injury.
The following WARNINGS are very important when
working on the battery:
Always heed the following WARNING SYMBOLS and safety pre­
cautions when working on the battery .
@
®
Always wear eye prote ction .
Battery acid contains sulfuric acid. Always wear
gloves and eye protection .
No
• sparks
- flames
· smoking.
When a battery is charged, it produces hydrogen
gas which is explosive and could cause personal injury .
Always keep the battery well out of reach of chil­
dren .
& WARNING
Whenever working on the battery or on the electrical system,
there is the risk of injury, accident and even fire. Read and heed the
following WARNINGS :
& WARNING (continued)
• Always wear eye protection. Do not let battery acid or any lead
particles get on your skin or clothing. Shield your eyes. Explosive
gases can cause blindness or other injury.
• Battery acid contains sulfuric acid. Sulfuric acid can cause
blindness and severe burns.
-Always wear gloves and eye protection . Do not tilt the
battery because acid could leak out of the ventilation openings.
- If you get battery acid in your eyes or on your skin, immedi­
ately rinse with cold water for several minutes and get medical
attention.
- If you should ingest any battery acid , seek medical attention
immediately .
• Do not expose the battery to an open flame , electric sparks or
an open light .
• Do not smoke.
• Do not interchange the positive and negative cables.
• When working on the battery, be sure not to short-circuit the
terminals with tools or other metal objects. This would cause the battery to heat up very quickly, which could lead to damage or
explosion and personal injury.
• When a battery is charged, it produces hydrogen gas which is
explosive and could cause personal injury.
• Always keep the battery well out of the reach of children.
• Before work is done on the electrical system, disconnect the
negative ground cable.
• Before performing any work on the electrical system, switch off
the engine and ignition as well as any electrical equipment. The
negative cable on the battery must be disconnected. If you are just
going to replace a light bulb , then it is enough to switch off the
lights.
• Before disconnecting the battery, switch off the anti-theft
alarm system! Otherwise you will set off the alarm.

Checking and filling -
--------------~-
•
& WARNING (continued)
• When disconnecting the battery, first disconnect the negative
cable and then the positive cable.
• Before reconnecting the battery, make sure all electrical
consumers are switched off. Reconnect the positive cable first and
then the negative cable. Never interchange the cables -this could
start a fire!
• Never charge a frozen or a thawed-out battery. It could
explode! If a battery has frozen, then it must be replaced. A
discharged battery can freeze over at 32 °F (0 °CI.
• Make sure the vent hose is always attached to the opening on
the side of the battery.
• Never use batteries which are damaged. There is the danger of
an explosion! Always replace a damaged battery.
& WARNING
California Proposition 65 Warning:
• Battery posts, terminals and related accessories contain lead
and lead compounds, chemicals known to the State of California
to cause cancer and reproductive problems. Wash hands after
handling.
0 Note
• Do not disconnect the vehicle battery when the ignition is
switched on or when the engine is running, otherwise, you will
damage electronic components in the electrical system.
• If your vehicle is going to stand for a long period of time without
being driven, protect the battery from "freezing", otherwise it will
be damaged and will then have to be replaced .•
Battery charging
Starting the engine requires a well charged battery.
Always read and heed all WARNINGS below=> & and => &
in "Working on the battery" on
page 321.
-Turn off the ignition and all electrical consumers.
- Make sure the area is well ventilated when you charge
the battery.
- Attach the red (positive
8) clamp of the charging equip­
ment to the positive terminal of the battery and the black
(negative(:)) clamp to the jumper terminal.
- Only now plug the mains lead for the charging equip­
ment into the wall outlet and turn it on=> &.
-Make sure the charging rate is not over 30 amps/14.8
Volt.
-When the battery is fully charged: Turn the charging
equipment off and remove the mains lead from the wall
outlet.
- Now remove the clamps for the charging equipment .
A discharged battery can freeze at temperatures of only O °C . Allow
a frozen battery to thaw completely before attempting to charge it
=> &. However, we recommend not using a thawed battery again
because the battery casing can be cracked due to ice formation and
can leak battery acid.
Battery charging (Maximum charging rate of 30
amps/14.8 Volt)
When charging at /ow voltages (e.g. with a trickle charger), the
battery cables do not have to be disconnected first. The battery caps
should
not be opened when charging a battery. ._.
Vehicle care I t •

111'1...__F_ u_ s_ e_s _ a_n _ d_ b_ u_lb _ s _______________________________________________ _
Fuses and bulbs
Fuses
Replacing a fuse
A problem in the electrical system may be caused by a
blown fuse.
Fig. 293 Instrument
panel left: Face cover
Fig . 294 Instrument
panel left: Content
Face cover
-Locate the fuse which belongs to the component which
failed.
Switch off the ignition and the electrical component
affected. -
Carefully pry the face cover off the instrument panel
using the ignition key or a screwdriver~ fig. 293.
- Remove the plastic clip@ from its retainer in the face
cover~ fig. 294, place it over the questionable fuse and
remove the fuse.
- Replace a blown fuse (recognizable by the melted metal
strip inside) with a fuse of the
same amperage.
The individual circuits are protected by fuses. The fuse panels with
the fuses are located on the left and right front faces of the instru­
ment panel behind a cover and in the left and right storage areas in
the luggage compartment.
There is a plastic clip@ in the cover on the left side of the instru ­
ment panel, which can be used to remove the fuses. The crank © is
used for emergency operation of the power roof*. You will also find
a label on both covers in the instrument panel with the fuse layout
© for the corresponding fuse panel.
& WARNING
Never replace a fuse with one that has a higher amperage rating.
• A fuse with a too high amperage could damage the electrical
part and cause a fire.
(D Note
• On no account should fuses be repaired (e.g. patched up with tin
foil or wire) as this may cause serious damage elsewhere in the elec­
trical circuit or cause fire.
• If a fuse blows repeatedly, do not keep replacing it. Instead, have
the cause of the repeated short circuit or overload located and fixed . .,_

_________________________________________________ F_ u_ s_ e_s _ a_n _d_ b_ u _ lb_ s _ __.11111
No. II Equipment
8 Engine control, auxiliary water pump
9
10
11
12
13
Climate control front /rear, dash panel buttons
Suspension leve l control system
(Adaptive Air Suspension)
Light and rain sensor
Display-/control unit
Roof electronics control unit
CD/DVD drive
15 Energy managemen t
16 Vacant
17 Radiator fan electronics
18 Airbag front passenger recognition
(weight sensor)
19 Vacant
20 Heated/ventilated seats
21 Engine control module
22 Vacant
23 Parking brake (switch)
24 Vehicle electrical system
25
26
27
Automatic transmission Air conditioning water valves water pump, rear climate control
Sunroof
28 Engine control module
29 Fuel injectors
30 Ignition coils Amps
10
5
10
5
5
10
5
5
5
5
5
5
5
10
15
10
20
5
15
30 No. Equipment
31 Fuel pump, right/fuel pump electronics
32 Automatic transmission
33 Right rear footwell heater
34 Heated/ventilated seats, rear
35 Heated/ventilated seats, front
36 Cigarette l ighter, front
37 Cigarette lighte r, rear/socket, rear
38 Auxiliary cooler fan
39 Door control unit, front right
40 Brake booster
41 Door control unit, rear right
42 Vacant
43 Headlight washer system
44 Air conditioning heater fan Amps
20/40
5
25
20
20
20
20/25 20
7.5
15
7.5
30
30
•
Fuse Location , Luggage Compa rtment left
0
Fig . 297 Fuse panel
layout _.
Vehicle care Do-it-yourself service irechnical data