2018 AUDI A8 key battery

Cockpit overv ie w
USA mod els : speed warning sys­
tem
¢ page 93
Ca nad a models: speed warning
system
¢ page93
Adaptive cruise contro l*./
¢ page 97
Air s uspension
¢ page22
Night vision ass ist*
¢ page 109
Night vision ass ist*
¢ page 109
Yello w indic ator light s
18
-------------Elect ronic Stab ilizat ion Control
( E SC)
./
¢ page 22
Electronic Stabilizat ion Control
(ESC)
./
¢ page22
USA models:
Ant i-lock braking system (ABS)./
¢page22
Canada mod els:
Anti -loc k braking system (ABS) ./
¢ page22
USA mod els: safety systems
¢ page23
Ca nad a models: safety systems
¢ page23
Brake pads
¢ page23
Electromechanical parking brake
¢ page20
Tire pressure monitoring system
.I
¢page300
Tire p ress ure mon itor ing system
¢ page 300
Eng ine control (gasol ine engine)
.I
¢ page23
Malfunction Indicator Lamp (MIL)
.I
¢page23
Engine speed limitation
¢ page23
Engine oil leve l
¢page 21
Engine oil sensor
¢page24
Engine wa rm-up request
¢ page24
Battery charge
¢page 21
Tank system
¢page24
Washer flu id leve l
¢page24
Windshield wipers
¢page24
Remote contro l key
¢ page 77
Remote contro l key
¢ page 78
Battery in remote contro l key
¢page29
Bu lb fa ilu re indicator
¢ page24
Rear fog lights
¢page24
Headlight range control system
¢page24
Adaptive light*
¢page44
Light/rain sensor
¢page 25
Active lane assist *
¢page 104
Transm ission
¢ page 87
Transm ission
¢page 87

lL t:0 ....
"' ......
"' .... 0 0 :c ' could start the engine or operate electrical
equipment such as power windows.
(D Tips
-The operation of the remote control key can
be temporarily disrupted by interference
from transmitters in the vicinity of the vehi­
cle work ing in the same frequency range
(such as a cell phone or radio equipment).
-Using the mechanical key, you can:
- Locking/unlocking the glove compartment
,;:;,page 64.
-Manually lock/unlock the vehicle
,;:;,page 32.
-Mechanically lock the doors c:> page 32.
-Unlock the luggage compartment lid us-
ing the emergency release r;;:;, page 36.
-For an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada regulations, see
r;;:;,page 339.
(D Tips
Removing the integrated mechanical key
Fig. 21 Remote control master key : remov ing t he mechani­
cal key
.,. Press the release button@ r;;:;, fig. 21.
.,. Pull the mechanica l key @ out of the remote
control key.
Opening and closing
LED and battery in the remote control key
Fig. 22 Remote control key: removing the battery holder
LED on the remote control key
The LED @ informs you about the function of the
remote control key.
.. If you press a button briefly, the LED blinks
once.
.. If the LED does not blink, the remote contro l
key battery is dead. The
ml indicator light and
the message
Please change key battery ap­
pear . Replace the battery in the remote control
key .
Replacing the remote control key battery
.. Remove the mechanical key r;;:;, page 29 .
.. Press the release button ® on the battery
holder and pull the battery holder out of the
re ­
mote control key in the d irect ion of the arrow
at the same time .
.,. Insert the new battery with the"+" symbol fac­
ing down .
.,. Slide the battery holder carefully into the re­
mote contro l key .
.. Insert the mechanical key.
@ For the sake of the environment
Discharged batteries must be disposed of us­
ing methods that wi ll not harm the environ­
ment. Do not d ispose of them in household
trash.
{!) Tips
The replacement battery must meet the same
spec ificat ions as the origina l battery in the re­
mote control key .
29

lL t:0 ....
"' ......
"' .... 0 0 :c ' The settings in the Infotainment system deter­mine if the entire vehicle or only one of the doors
is unlocked when unlocking the vehicle
c:> page 32.
_&. WARNING
Read and heed all WARNINGS c:> .& in Descrip­
tion on page 2 7.
@ Tips
If your vehicle is left standing for a long peri­
od of time, note the following:
-The proximity sensor switches off after a
few days to save energy. You then have to
pull once on the door handle to unlock the
vehicle and a second t ime to open it.
-The energy management system gradually
turns off unnecessary convenience functions
to prevent the vehicle battery from draining
and to mainta in the vehicle's ab ility to start
fo r as long as possib le. You may not be able
to unlock your vehicle us ing the convenience
key.
- Fo r an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada reg ulations, see
c:> page 339 .
Central locking switch
Fig. 25 Dr iver 's door: centra l lock ing sw itc h
Op eni ng and clos ing
Fig. 26 Rear doors: central lock ing switch
"To lock the vehicle, press the ffi button c:> fig . 25
or c:> fig. 26, c:> &_ .
.. To unlock the vehicle, press the crl button .
When locking the veh icle with the central lock ing
switch, the following app lies:
-Opening the door and the luggage compart­
ment lid from the
outside is not poss ible (for
secur ity reaso ns, such as when stopped at a
light).
- The LED in the central locking sw itch turns on
when all doors are closed and locked.
- Front doors: you can open the doors individual­ ly from the inside by pulling the door handle .
- Rear doors: to unlock the doors, pull on the
door ha ndle
one time . To open the doors, pull
on the door handle
again .
- In the event of a crash with a irbag deployment,
the doors unlock a utomat ically to allow access
to the vehicle.
_&. WARNING
- The central locking switch a lso works when
the ign ition is switched off and automatica l­
ly locks the entire vehicle when the
ffi but ­
ton is pressed.
- The cent ral locking switch is inope ra tive
when the vehicle is locked from the outside.
- Locked doors ma ke it more diffic ult for
emergency workers to get into the vehicle,
which puts lives at r isk. Do not leave anyone
behind in the vehicle, especially c hildren .
(D Tips
Your vehicle locks automatically when it
reaches a speed of 9 mph (15 km/h) (Auto
Lock)
c:> page 27 . You can unlock the vehicle
31

lL t:0 ....
"' ......
"' .... 0 0 :c ' area, because then the luggage compart­ment lid cannot be fully closed .
- Never leave your vehicle unattended espe­
cially with the luggage compartment lid left
open . A child could crawl into the car
through the luggage compartment and pull
the lid shut, becoming trapped and unable
to get out . To reduce the risk of personal in­
jury, never let children p lay in or around
you r vehicle . A lways keep the luggage com­
partmen t lid as well as the vehicle doo rs
closed when not in use.
- Never close the l uggage compartment lid
ina ttentively or without checking first . Al­
though the closing force of the l uggage
compartment lid is limited, you can still se­
riously injure yourself or others.
- Always ensure that no one is within range of
the luggage compartment lid when it is
moving, in particular close to the hinges and
the upper and lower edges
-fingers or
hands can be pinched.
- Never try to interfere w ith the luggage com­
partment lid or help it when it is being
opened or closed automatically .
(D Tips
- The settings in the Infotainment system de­
termine if the luggage compartment lid can be opened us ing the handle
q page 32.
- When the vehicle is locked, the luggage
compartment lid can be unlocked separately by pressing the
l .::s l button on the remote
control key. The luggage compartment lid l ocks automatically when it is closed again .
- You can close the luggage compartment lid
us ing the remote control key (veh icles w ith
convenience key*) up to a d istance of ap­
p rox imately 9 feet (3 m).
- The luggage compartment lid can be oper­
ated manually if the veh icle battery is low.
It is necessary to use more force when doing
th is. Move the lid slowly to red uce the
amount of force needed.
Op eni ng and clos ing
Opening the luggage compartment lid with
foot motion activation (kicking movement)
Applies to: vehicles with convenience key and sensor-cont rol­
led luggage compartment lid
F ig. 32 Rear of the vehicle : foot movement
Requi rements : you must be carrying your veh icle
key with you . You must be standing at the center
behind the luggage compartme nt lid . The dis ­
tance to the rear of the veh icle must be at least 8
in (20 cm) . The ignition must be switched off.
Make s ure yo u have f irm footing .
.,. Move your foot back and forth below t he bump ­
er
q fig . 32 . Do not touch the bumpe r. Once the
system recogn izes the movement , the luggage
compa rtment l id will ope n.
T he luggage compartment lid will only open if
you make the movement as descr ibed . T h is pre­
vents the luggage compa rtment lid from open ing
due to similar movements, such as when you
walk betwee n the rear of the vehicle and your ga­
rage door .
General information
In some si tuations, the f unct ion may be lim ited
o r tempora rily unavailable . T his may happen if:
- the luggage compartment lid was closed imme ­
diately before .
- you park close to a hedge and the branches
move back and forth under the veh icle for a
long per iod of t i me
- you clean your veh icle, for example with a pres ­
sure washer or in a car wash
- there is heavy ra in
- the bumper is very dirty, for example after d riv-
ing on salt-covered roads
..,.
35

lL t:0 ....
"' ......
"' .... 0 0 :c ' 12 volt sockets
Applies to: veh icles with sockets
Fig . 70 Side compartment in luggag e compartment: 12
volt socket•
Fig. 71 Example of a rear center console: 12 volt socket
The 12-volt sockets can be used for electrical ac­
cessories. The power consumption at the outlet
must not exceed 120 watts.
There is an additional 12 volt socket in the center
console
¢page 63, fig . 75.
_&, WARNING
The sockets and the electrical accessories con­
nected to them only funct ion when the igni­
tion is switched on. Incorrect usage can lead
to ser ious injuries or burns. To reduce the risk
of injuries, never leave children unattended i n
the vehicle with the vehicle key.
(D Note
- Never connect any accessories that provide
power (such as solar panels or battery
charger for the vehicle battery) to the ciga­
rette lighter. They can damage the vehicle
electrical system .
- To reduce the risk of damage to the sockets,
on ly use plugs that fit correct ly .
Seats and storage
115 volt socket
Applies to: vehicles with 115 volt socket
T he 115 volt socket can be used when the igni­
tion is switched on
¢ .&. . When you push the con­
nector all the way into the socket, the child safe­
ty mechanism re leases and current flows through
the socket.
Connectable devices
Electrica l devices can be connected to the 115
volt socket in the vehicle. The device connected
to the socket must not use more than 150 watts
of power (300 watts peak power). Check the
power usage of the connected device on the type
label.
LED on the socket
-The socket is ready for use when the LED is
green.
- There is a malfunction if the LED is blinking red.
The socket will switch off automatically due to
overcurrent or overheating. The socket will
switch on again automatically after a cool­
down period. Any devices that are connected
and sw itched on w ill act ivate aga in automati­
cally¢ .&.
_&, WARNING
- The sockets and the electrical accessories
connec ted to them only f unction when the
ignit ion is switched on. Incorrect usage can
lead to serious injuries o r burns. To reduce
the risk of injuries, never leave children un­
attended in the vehicle with the vehicle key.
- If devices or connectors that are heavy (for
example a power supply unit) are attached
d ire ctly to the socket, the holder can be­
come damaged, wh ich increases the risk of
injury.
-To reduce the risk of fatal injury, store all
connected devices securely when driving so
that they do not
move around inside the ve­
h icle when braking or if involved a crash.
- To reduce the risk of fatal injury, do not spill
any fluids on the socket. Should any mo is-
ture enter the socket, make sure that it has
~
61

Driving
Shift to P, otherwise vehicle can roll away.
Doors do not lock if lever is not in
P.
This driver message appears fo r safety reasons if
the transmission has not been shifted to the P
position when you switch the ignition off. Move
the selector lever to the P position . Otherwise the
veh icle is not protected from ro lling and it cannot
be locked.
(I Key is not recognized. Hold back of key
against marked area. See owner's manual
If the i ndicator light turns on and this message
appears, there is a
malfunction ~ page 78.
Turn off ignition before leaving car
This message appears if the driver's door is
ope ned while the ignition is switched on . Always
sw itch off the ignition if you are leavi ng the vehi­
cle .
Shift to P and turn off ignition before leav ing
car, otherwise vehicle can roll away
This message appears if the driver's door is
opened while the ignition is switched on and the
transmission has not been shifted to the P posi­
tion . Shift the transm iss ion into the P posit ion
and turn off the ign ition if you are leaving the ve­
h icle . Otherwise the vehicle could roll.
Starting the engine when there is a
malfunction
It may not be possible to start the engine under
certain circumstances, for example if the battery
in the vehicle key is drained, if interference is af­
fected the key or if there is a system malfunc­
tion .
c:====== ~
~ _____ ___ ci5
Fig . 91 Cente r console/remote cont ro l key : sta rt ing the
eng ine
if t here is a malfunc tion
78
Requirement: the message Key is not recog­
nized. Hold back of key against marked area .
See owner's manual
must appear and the (I i n ­
dicator light must turn on.
.,. Hold the remote control key vertically in the lo ­
cation indicated
y >l) ~ fig. 91 .
.,. Press the brake peda l.
.,. Press the I START ENGINE STOPI button. The
engine will start.
.,. Drive to an authorized Audi dealer or author ­
ized Aud i Serv ice Facility immediately to have
the malfunction corrected .
(0 Tips
You can v iew the message aga in by pressing
the
I S TAR T ENGINE STOP I button.
Start/Stop system
Description
Applies to: vehicles with Start/Stop syste m
The Start/Stop system can help increase fuel
economy and reduce CO2 emissions.
In Start/Stop mode, the eng ine s hut s off auto­
matically when the vehicle is stopped, such as at
a traffic light . The ignition remains switched on
during this stop phase. The engine w ill restart
automat ically w hen needed.
The last Start/Stop system setting is restored
when the ignition is switched on.
Basic requirements for Start/Stop mode
- Th e driver's door must be closed.
- The driver's seat belt much be fastened.
- The hood must be closed .
- The vehicle must have dr iven faster than
2.5 mph (4 km/h) since the last t ime it stop ­
ped .
- A trailer must not be hitched to the vehicle .
A WARNING
-Never turn off the eng ine before the vehicle
has come to a complete stop . The full func­
tion of the brake booster and the power
steering is not guaranteed. You must use
more force to turn or brake. Because you

Assistance systems
Switching on/off
Applies to: ve hicles w ith Aud i side ass ist
F ig. 122 Driver's door : side ass ist butto n
• Press the button to switch the system on and
off
c> .&, in General information on page 107 .
The LED in the button turns on when side assist
is sw itched on.
Setting the display brightness
App lies to: ve hicles with Aud i side ass is t
The display brightness can be adjusted in the In ­
fotainment system .
• Select : the ICARI function button > Car systems
control button > Driver assistance > Audi side
assist .
The display brightness adjusts automatically to
the br ightness of the surroundings, both in the
information and in the warning stage . In very
dark or very br ight surroundings, the automat ic
adj ustment will set the disp lay to the minim um
or maximum level. In such cases , you may notic e
no change when adjust ing the brightness, or the
change may only be noticeable once the sur­
ro undings change .
Adj ust the brightness to a level where the disp lay
i n the information stage will no t disrupt your
view ahead.
If you change the brightness, the dis­
p lay in the exter ior mirror wi ll briefly show the
brightness lev el in the information stage . T he
brightness of the warning stage is linked to the
brightness in the information stage and is adjust­
ed along with the information stage.
108
@ Tips
-Side assist is not active while you are mak­
ing the adjustment .
- Your settings are automat ica lly stored and
assigned to the remote control key being
used .
Messages
Applies to : vehicles wi th Audi side ass ist
If side assist switches off by itself, the LED in the
button turns off and a message will appear in the
i nstrument cluster display:
Audi side assist: Currently unavailable. No
sensor vision
The radar sensor vision is impaired . Do not cover
the area in front of the sensors with bike wheels,
stickers, dirt or ot her objects . Clean the area in
front of the sensors, if
necessary ¢ page 106,
fig. 121 .
Audi side assist: Currently unavailable
Side assist cannot be switched on at this time be­
cause there is a malfunction (for example, the
battery charge level may be too low).
Audi side assist: System fault!
The system cannot guarantee that it will detect
vehicles correctly and it has switched off. The
sensors have been moved or are faulty . Have the
system checked by an authorized Audi dealer or
autho rized Aud i Serv ice Facility soon.
Audi side assist: Unavailable when towing
Side assist switches off automatically when a fac­
tory- installed trailer hitch is connected to the
electrical connector on the trailer. There is no
guarantee the system will switch off when using
a retrofitted trailer hitch. Do not use side ass ist
when towing a trailer.

Rear Seat Ent ertainm ent
right and change the batteries as labeled in the
battery compartm ent . Then attach the cover
back on to the left earpiece
(L).
You can ident ify t he charge status of the battery
q table on page 200 based on the blinking
speed of the LED in the charging cable conn ec­
tion
CD q fig. 209.
Blinking fre- Charge status
quency
Blinking The batteries are cha rging.
Rema ins on The batte ries are charged .
Blinking An error occurred while charg-
quickly ing.
A WARNING
- Do not use damaged rechargeable batteries .
T his increases the r isk of an explos ion.
- The headphones can become warm when
the batteries a re charg ing and increase the
risk of injury .
- Do not charge standard batteries with the
charg ing cable. This increases t he risk of an
exp losion .
- Be careful when using the c igarette lighter .
I n attentive or unsupe rvised use of the c iga­
rette lighte r can cause burns.
- T he ciga rette lighter/sockets and any elec­
t rical accessor ies connected to t hem func­
t ion only whe n the ign ition is sw itched on.
U sing the ciga rette lighter/sockets o r elec ­
trical accessories incorrect ly can lead to se ­
rious injuries or cause a fire. To reduce the
risk of in juries, never leave children unat­
tended in the vehicle with the vehicle key.
@ Note
- Do not charge the batteries in the wireless headphones when the engine is not run ­
ning . This will dra in the vehicle battery .
- For wireless headphones, on ly use batteries
that are approved for that type of device,
for example NiMH batteries with a mini­
mum capacity of 550 mAh in AAA size that
are suitable for quick charging .
200
@ For the sake of the environment
Batteries contain polluting substances. They
must be disposed of us ing methods that w ill
not harm the env ironment. Do not dispose of
them in househo ld trash.
(D Tips
The charging time for t he included rechargea­
ble batter ies is approximate ly three to four
hours and may increase by approximately 25
percent if the batter ies are in use while charg­
ing .
Headphones connected by cable
App lies to: vehicles with Rear Seat Entertainment
The headphone connec tions are located on the
RS E control unit.
Fig . 21 0 Co nn ect in g wir ed h eadpho nes
.,. Insert t he headphone connecto r into the left or
right jack
CD q fig . 210 on the RSE control pan ­
el.
The unit is eq uipped w ith 3.5 mm stereo jacks .
The w ireless headphones sw itch off automat ical­
l y about f ive minutes after the cable headphones
a re connected.
(D Tips
Volume that is too h igh or too low is auto­
mat ica lly adjusted to a preset level whe n the
wired headphones are connected.