AUDI S8 2008 Service Manual

Memories
The trip computer is equipped with two fully automatic
memories.
Fig . 22 Trip computer
display: memory level 1
You can switch between the trip computer 1 and 2 by pressing the
Reset button
@ =>fig. 23.
You can tell which memory level is currently active by the number in
the
display => fig. 22. The data from the single -trip memory
(memory level 1) is being displayed if a
1 appears. If a 2 is shown,
then the data from the total -trip memory is being displayed
(memory level 2).
Single-trip memory (Trip computer 1)
The single-trip memory stores the trip information from the time the
ignition is turned on until it is turned off. If the trip is continued
within 2 hours from the time the ignition was turned off, the new
data will be included in the calculation of the current trip informa ­
tion. If the trip is interrupted for
more than 2 hours the memory is
reset automatically .
Total-trip memory (Trip computer 2)
Unlike the single-trip memory, the total -trip memory is not reset
automatically . This permits you to evaluate your driving data for the
entire period between manual resets .•
Contro ls a nd eq uip­
ment
Driver information display
Operation
The trip computer is controlled by two switches on the
windshield wiper lever.
Fig. 23 Windshield
wiper lever : controls
for the trip computer
Push the function selector switch up or down @
~ fig. 23. This will cause the five distinct trip computer
functions to be displayed one after another.
The trip computer only operates when the ignition is on. When you
turn on the ignition, the function that was in use when you last
turned the ignition off will be displayed.
In addition to the trip computer information (memory level 1 or 2) ,
navigation information and Adaptive Cruise Control * information
can be displayed . To switch the display between the different
systems, tap the Reset button
@ briefly.
Setting values to zero
To delete one current value from the trip computer, select the
desired function and press the Reset button @ for at least one
second. The following values can be set to zero
individually using
the Reset button:
• elapsed time
• average fuel mileage
• average speed
Vehicle care I I Technical data

Driver inf ormation displ ay
In addit ion, a ll the values in the single-trip or the total -trip memory
can be de leted s imu ltaneously.
[ i ] Tips
All stored values will be lost if the vehicle battery is disconnected. •
MMI settings
Basic settings for the trip computer can be made in the
MM/.
Fig . 2 4 M MI di splay :
Trip com put er
S ett ing v alu es to ze ro
- Pressthe!CAR)function button.
- Select
S ystems in the CAR menu .
- Selec t
Instrum ent cluster.
- Selec t Trip compute r 1 or Trip comput er 2.
- Select Reset to delete all the values in the memory
=> fig. 24 .
Displaying and hiding dri ver inform ation
- Press the
I CAR) f unct ion butto n. - Selec
t
Syste m s in the CA R me nu.
- Select
Instrument clu ster .
- Select Trip computer 1 or Trip computer 2 .
-Select, for example, Fu el range On to tu rn on t he display
or
Off t o turn the display o ff.
All values in the s ingle -tr ip or the total -trip memory can be reset to
zero simultaneously in MMI. In addition you can de termine what
driving information from the trip computer shou ld be shown in the
ins trument cluster display. If one of the pieces of dr iver information
is turned
off, that driver information will not be shown in the display .
The informat ion wi ll continue to be calcu lated by the trip computer
and can be turned back
on at any time. •
Tire pressure monitoring system
General notes (l)
Each tire, including the spare {if provided), should be checked
monthly when co ld and in flated to the inflation pressure recom ­
mended by the vehicle manufacturer on the vehicle p lacard or tire
inf lation pressure labe l. (If your vehicle has tires of a different size
than the size indicated on the vehicle placard or tire inflation pres­
sure labe l, you should determine the proper tire inf lation pressure
for those
tires.!
As an added safety feature , your vehicle has been equipped with a
t ire pressure monitoring system {TPMS) that illuminates a low t ire
pressure telltale when one or more of your tires is significantly
under -inf lated. Accordingly, when the low t ire pressure te lltale i llu­
minates , you should stop and check your tires as soon as possible,
and inf late them to the proper pressure . Driving on a significantly
under-inf lated tire causes the tire to overheat and can lead to tire
~

failure. Under-inflation also reduces fue l efficiency and tire tread
life, and may affect the veh ic le's handling and stopping abi lity.
Please note that the TPMS is not a substitute for proper tire mainte­
nance, and it is the driver's responsibi lity to maintain correct tire
pressure, even if under-inflation has not reached the leve l to tr igger
illumination of the TPMS low tire pressure tellta le.
Your veh icle has a lso been equipped with a TPMS malfu nction indi­
cator to indicate when the system is not operating properly . The
TPMS malfunction indicator is combined w ith the low tire press ure
telltale . When the system detects a ma lfunction , the telltale wi ll
fl ash for approximately one minute and then remain continuously
illum inated . This sequence will continue upon subsequent vehicle
start -ups as long as the ma lfunction exists.
When the ma lfunctio n indicator is i llum inated, the system may not
be ab le to detect or signa l low tire pressure as intended . TPMS
malfunctions may occ ur for a var iety of reasons, i nclud ing the
installation of replacement or alternate tires or wheels on the
vehic le that prevent the TPMS from f unctioning proper ly . Always
check the TPMS malfunction tellta le after replac ing one or more
t ires or whee ls on yo ur ve hicle to ens ure t hat the replacement or
a lternate tires and wheels allow the T PMS to continue to function
proper ly. •
Introduction
The tire pressure monit oring system m onitors air pressure
in all four road wheels and the spare tire* while the
vehicle is movin g.
As soon as the tire pressure moni toring system se nses a signi ficant
loss of air pressure in one or severa l tires, text messages and yellow
symbo ls appear in the inst rume nt cluster d isplay to aler t t he driver .
T he
(l) warning light in the instrument c luster comes on when the
t ire is sig nificant ly underinflated
=> page 20 .
Controls and equip­
ment
Driver information di splay
The warning light U) also i lluminates in the case of a system
mal fu ncti on.
The system continuous ly receives rad io signa ls from sensors
located inside each tire .
Be aware that t ire p ressu re is also dependen t on the tempera ture of
the tire . For every
18 °F (1 O °C) increase in tire temperature, tire pres­
sure increases by about 1 .5 psi (0 .1 bar). The tire warms up wh ile the
vehicle is moving and t ire pressure rises . So you should adjust tire
pressure only when the t ires are
cold, when the temperature of the
tires is roughly the same as the ambient air temperature .
I n order to keep the tire pressure monitoring system properly cali ­
brated, tire pressure on all four tires and on the spare tire* should
be checked at regular intervals, adjusted if n ecessary and saved in
the proper setti ng (recommended
pressure) => page 44.
The tire pressure is shown on the tire pressure label. On USA vehi ­
cles, the tire pressure labe l is located on the drive r's s ide B -p ill ar. On
Canada vehicles, the tire pressure labe l is located either on the
driver's side B -pillar o r inside the fuel fi ller flap. The t ire press ure
label l ists t he recommended cold tire inflat io n pressures for t he
vehic le at its maximum capacity weight and the tires that were on
your ve hicle at the time it was manufactured . For recommended tire
pressures for normal load condit ions, please see chapter
=> page 328 .
The current temperatures and pressure of your tires can be viewed
in the M MI
=> page 43 .
& WARNING
• When the tire pre ssure monitoring system warning light i s lit ,
one or more of your tires is signifi cantly under -infl ated . You should
stop and check your tires a s soon a s po ssible , and inflate them to
the proper pre ssure a s indi cated on the vehi cle' s tire pre ssure
label
=> page 328 . Driving on a significantly under -inflated tire
ca use s the tire to o verheat and can lead to tire failure. Under -infla -
~

Driver information display
& WARNING (continued)
tion also is likely to impair the vehicle's handling and stopping
ability.
• Do not adjust tire pressure when tire temperature is excessive .
This could lead to serious tire damage and even cause the tire to
burst, with the additional danger of an accident.
W For the sake of the environment
Driving with under -inflated tires reduces fuel efficiency and tire
tread life.
[ i) Tips
• Each tire, including the spare*, should be checked monthly when
cold and set to the recommended inflation pressure as specified on
the tire pressure label
=> page 328.
• The tire pressure monitoring system helps the driver to keep an
eye on tire pressures. But the driver still has the responsibility for
maintaining the correct tire pressure .
• Tire pressure must only be adjusted when the temperature of the
tires is about the same as ambient air temperature.
• When tires are replaced, the sensors and valves should not be
detached or exchanged. Only the valve core needs to be replaced
and, if necessary, the valve and the wheel electronics replaced.
• If you should put different wheels and tires on your vehicle (e .g.
winter wheels and tires), you must be certain that the wheels and
tires are compatible with the tire pressure monitoring system .
Otherwise the system will register a malfunction and a fault
message will be displayed. For more information, contact your
authorized Audi dealer.
• Adjust the tire pressure and store the pressure in the tire pres ­
sure monitoring system to the load you are
carrying => page 328. •
Significant loss of air pressure ( )
The yellow symbol appears in the event of a significant
loss of air pressure.
Fig . 25 Display: yellow
symbol with message
Fig . 26 Display: yellow
symbol without
message
If the warning light in the instrument cluster:::::, page 20
illuminates and then the ( symbol appears in the display
:::::, fig. 25 or:::::, fig. 26, this means the tire pressure is too low
in one or several tires (including spare tire* with sensor).
Stop driving as soon as possible without endangering
yourself or other drivers on the road.
- Inspect the tire or tires.
Change the tire if
necessary:::::, page 351.

The j warning light in the instrument cluster comes on when the
tire is significantly underinflated.
In addition, the tire symbo l
) appears in the display together with
the message
Please check tire pressure => page 42, fig. 25.
Af ter a few seconds, the message disappears again:::>
page 42,
fig. 26. If you would like to show the message again, press the
!CHECK] button.
[ i] Tips
• In the case of an intentional loss of air pressure, for example,
when re-adjusting tire pressure, this has to be stored again after­
wards =>
page 44.
• Current information about tire pressures and temperatures can
be scanned in MMI =>
page 43.
• Tire pressure must only be adjusted when the temperature of the
tires is about the same as ambient a ir temperature .
• The yellow symbol disappears, when the tire pressure is
corrected and the new pressure is stored in the system=>
page 44.
• After changing a wheel you have to adjust the tire pressures on
all whee ls . In addition, you must then initialize the new tire pres­
sures in the tire pressure monitoring system =>
page 45.
• If your vehicle is equipped with a spare tire* with a wheel sensor,
the tire will be monitored and the display
symbols => page 42, fig. 25
or=>
page 42, fig. 26 will appear if the pressure is too low.•
Controls and eq uip­
ment
Driver information display
Displaying tire pressures and temperatures
The current status of the tires can be displayed in MM/.
'
!
Tire pressure monitoring
• Disp lay tire pressures ...
I
Fig . 27 MMI display :
T ire pres sure moni­
toring system
12 :QQ AM
Turn on the ignition.
Press the
I CAR I function button.
Select
Systems in the CAR menu.
Select
Tire pressure monitoring .
,. •I
Fig. 28 MMI display:
Displaying the tire
pressure
Select Display tire pressures . The tire pressures and
temperatures are displayed
~ fig. 28.
Current tire pressures are shown in green and yellow numbers. The
meaning of the colors is as follows:
~
Vehicle care I I irechnical data

Driver inf ormation displ ay
• Green: If current tire pressure and the spec ified pressure are
approximate ly the same, t he tire pressure is shown in green.
• Yellow : If current tire pressure is too low with respect to specified
pressure, the tire pressure is shown in yellow.
[ i ] Tips
• During the learn ing period, t ire pressure and t ire temperature
are not displayed . Horizontal lines--,-- are displayed for pressure
and temperature.
• The tire pressure is shown on the label located either on the
driver's side B-pi llar (visible when the door is open) or ins ide the fuel
filler flap .
• The tire pressure monitor ing system he lps the driver to keep an
eye on tire pressures . But the driver stil l has the responsibility for
maintaining the correct t ire pressu re .•
Storing tire pressures
Correct storage of specified pressure is the basic require­
ment for reli able tire pressure moni toring .
In order for the tire pressure monitor ing system to o perate
appropr iately, you have to re-save the specified p ressures
whenever you adjust tire pressure, for example when the load condition of your vehicle changes . Proceed as fo llows :
Correcting tire pressure
-Check t he pressure in the tires ( includin g the spare tire*).
-Ad just air pressure as needed in accordance with the
informat io n on the label loca ted either on the d river 's
side B- pillar (visible whe n the do or is ope n), ins ide the
f u el fill er flap a nd a ddit ionally in the manua l.
Saving tire pressur es
-Tur n on the ignition .
-Press the I CAR] fu nct ion button .
-Select Systems in the CAR me nu.
-Selec t Tire pressure monitoring .
-Select Store curr. tire pressures=> page 43, fig. 27.
A ll pressure warning indicators in the display wi ll be cance led .
Following each intentional cha nge in speci fied pressures, tire pres ­
sures must be resaved.
Afte r the pressures are saved, the tire pressure monitoring system
measures the current t ire pressures and saves them as the new
specified pressures .
[ i] Tip s
• T he tire pressure is shown on the tire pressure label. On USA
veh ic les, the tire pressure label is loca ted on the driver's side B­
pillar . On Canada vehicles, the tire pressure labe l is located either on
t he dr iver's side B -p illar or i nside the fuel filler flap . The t ire pressure
label lists the recommended cold tire inflation pressures for the
vehic le at its maximum capacity weight and the tires tha t were on
your vehicle at the time it was manufactured . For recommended tire
pressures for normal load conditions, please see chapter
=> page 328.
• The tire pressure monitoring system he lps the driver to keep an
eye on tire pressures. But the driver still has the responsibility for
maintaining the correct tire pressure.
• If your vehic le is equipped with a standard spare tire *, it must be
inflated to the maximum pressure spec ified for the vehicle. •

Changing a wheel When you change a wheel, the new tire must be initial­
ized.
Turn on the ignition.
Press the
I CAR I function button.
- Select
Systems in the CAR menu .
- Selec t
Tire pressure monitoring .
-Select Initialize wheels ~ page 43, fig. 27.
Programming is necessary:
• After the tires have been rotated on the vehicle (including use of
the spare tire*),
• If tires with new wheel sensors are used.
All pressure warning and system malfunction indicators in the
display will be canceled.
If a wheel change has been made, it is necessary to complete the
Initialize wheels function.
Th e tire pressure monitoring system is not available dur ing the
programming process and no pressure and temperature values are
displayed on the MMI display.
After you have selected the funct ion, the new wheels are
programmed and the actual pressures are stored. This learning
phase can take up to 20 minutes driving time.•
Contro ls a nd eq uip­
ment
Driver information display
Malfunctions
A malfunction can have various causes.
Fig. 29 Display:
Syste m malfunction
If the ...., warning light in the instrument cluster flashes for approxi­
mately one minute and then remain continuously illuminated and
additional ly the
=> fig. 29 symbol appears in the display, the
tire pressure monitoring system is not available. This can have
various causes.
• If the message appears at the end of the learning process, the
system cannot recognize the wheels installed on the vehicle. This
can be because one or more wheels without a wheel sensor were
insta lled .
• A wheel sensor or other component may have failed.
• The system has detected more than 5 wheels with wheel sensors
in the vehicle, for example when carrying snow tires.
• A tire was changed but the
Initialize wheels function was not
activated
=> page 45.
• Audi replacement parts were not used.
• If snow chains are being used, system function can be compro­
mised due to the shielding properties of the chains.
• The tire pressure monitoring system may not be available
because of a radio malfunction.
Vehicle care I I irechnical data

Driver inf ormation displ ay
• Transmitters with the same frequency, such as radio head­
phones in the vehic le or rad io equipment, can cause a temporary
disruption of the system through excessive electromagnetic fields .
• Elimi nate the in terference if possible/if you can and then re-start
the
Initi alize w heel s function . If the warning light comes on again,
you shou ld con tact your autho rized Audi dea ler im mediately to have
the prob lem corrected .
• Do not use commerc ial ly avai lab le tire sea lants . O therwise, t he
e lectrica l components of the tire pressure monitoring system wi ll
n o longer work properly and the sensor for the tire p ressure moni ­
toring system wi ll have to be replaced by a qua lified workshop. •

Opening and closing
Keys
Key set
@ Master key with remote control
Fig. 30 Key set
You can centrally lock and unlock your vehicle and start the engine
with the master key with remote control.
@Valet key
The valet key fits only the driver's door and the ignition lock. If you
have to leave the key with somebody else, you are well-advised to
turn over the valet key only.
Be aware that the rear lid can be opened from inside the vehicle with
the remote rear lid release located in the driver's door. Before you
turn over the valet key you should therefore lock the rear lid
mechanically with the master key.
Turn the master key
clockwise to the horizontal position and pull it
out . This has two effects:
• the
remote rear lid release is deactivated,
• the lid will remain locked when the power locking system is actu­
ated.
Controls and equip­ ment
Opening and closing
In this state the rear lid can be unlocked only with the remote
control unlock button
c:::::5 on the master key.
© Emergency key
The emergency key is only for temporary use if the vehicle key
should be lost or misplaced
=> &.
Key replacement
If you lose a key, contact your authorized Audi dealer immediately
to have the /ostkey disabled. Be sure to bring all your keys with you.
& WARNING
• Do not leave your vehicle unattended with the key in the igni­
tion lock. Entry by unauthorized persons could endanger you or
result in theft or damage the vehicle. Always lock all doors and
take the key.
• Do not leave children unattended
in the vehicle, especially with
access to vehicle keys. Unguarded access to the keys provides
children the opportunity to start the engine and/or activate vehicle
systems such as the power windows etc. Unsupervised operation
of any vehicle system by children can result in serious injury.
[ i] Tips
• If you open the driver 's door with the key left in the ignition lock,
a chime will sound . This is your reminder to remove the key and lock
the door.
• For security reasons, replacement keys are only available from
Audi dealers.
•

Opening and clo sing
Master key vvith remote control
The remote control allows y ou to l ock or unlock the
vehicle electronically.
F ig . 31 Fo ld -u p m aster
key wit h re mote
c ontr ol
-To fold the key out and back i n place, press the release
button
::::, fig. 3 1.
The transmitter and battery are located in the head of the remote
control. The r eceiver is locat ed ins ide th e vehicle . Th e maximum
ef fective range depends on several th ings. Remember, if the battery
is weak, the effective range decreases.
If you need to replace the remote contro l, or if you need to have it
repaired, you must see your authorized Audi dealer. On ly then can
you use the key again .
P erson aliz ing the ma ste r ke y
When the ignition is turned off or when the vehicle is locked, various convenience set tings are stored automatical ly and assigned to the
key that was used . The settings assigned to the key are automati ­
cally recalled with you unloc k the vehicle or when you open a door
or when you switch on the igni tion .
• Climate contro l
• Ce ntral locking
• Windows and rear window sun blind •
Background lighting *
• Seat memory
• Adaptive Cruise Contro l*
• Audi lane and side assist *
• Advanced Parking Syste m*
The
Remo te co ntrol ke y function must be activated in MMI
~ page 95, so that the settings fo r the driver's seat (including the
settings for the head restraint, steering column , safety be lt height
and exterior mirrors) are saved on the master key through the seat
memory when the vehicle is locked, and are set automatically when
the vehic le is unlock ed.
[ i ] Tip s
• If the ignition is switched on, the remote control system is deac ­
tivated .
• The remote control system can be affected by other systems
opera ting in the same frequency range close to the vehicle, such as
mobile tel ephones, television broadcasting stations, etc. •
Battery replacement, master key
g N
-. w 1l.
Fig . 3 2 Che ck light in
th e m as ter key
Battery operation in the master key is monitored by a check light .
The check light flashes when one o f the buttons on the master key
~