2018 AUDI A4 ECU

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A WARNING
-
Improperly installed child safety seats in­
crease the risk of serious personal injury and
death in a collision.
- Always make sure that the safety belt re­
tractor is locked when installing a child
safety seat. An unlocked safety belt retrac­
tor cannot hold the child safety seat in place
during normal driving or in a crash.
-Always buckle the child safety seat firmly in place even if a child is not sitting in it. A
loose child safety seat can fly around during
a sudden stop or in a collision.
- Always make sure that the rear seat back­
rest to which the center rear safety belt* is
attached is securely latched whenever the
rear center safety belt is being used to se­
cu re a ch ild restraint .
-If the backrest is not securely latched, the
child and the child restraint will be thrown
forward together w ith the backrest and will
strike parts of the vehicle interior. The ch ild
can be se riously injured or killed .
-Never install rear-facing child safety seats
or infant carriers on the front passenger
seat . A child will be serious ly injured and
can be killed when the passenger airbag in­
flates.
-The inflating airbag will hit the child safety seat or infant carrier with great force and
will smash the ch ild safety seat and chi ld
against the backrest, center armrest, door
or roof .
-Always install rear-facing child safety seats
or infant carriers on the rear seat.
-Forward-fac ing ch ild safety seats or infant
carriers installed on the front passenger's
seat may interfere with the deployment of
the a irbag and cause serious injury to the
child .
-It is safer to install a forward -fac ing ch ild
safety seat on the rear seat .
- Always read and heed all WARNINGS when­
ever using a child restrained in a veh icle is
being used
~ page 295 . Specia l precaut ions
apply when installing a child safety seat on
the front passenger seat
~ page 2 72, Child
Ch ild safety
restraints an the front seat -some impor­
tant things to know.
A WARNING
-A lways take special precautions if you must
i nstall a forward or rearward-facing child re­
stra int on the front passenger's seat in excep ­
tional s ituations:
-Whenever a forward or rearward-fac ing
child restraint is installed on the front pas ­
senger seat, the
PASSENGER AIR BAG OFF
~; light must come on and stay on whenev­
er the ign ition is switched o n.
-If the PASSENGER AIR BAG OFF ~; light
does not come on and stay on, perform the
checks desc ribed
~ page 283, Monitoring
the Advanced Airbag System.
-Take the child restra int off the front passen­
ge r seat and install it prope rly at one of the
rear seat positions i f the
PASSENGER AIR
BAG
OFF ~; light does not stay on whenever
the ignition is switched on .
-Improper installat ion of child res tra ints can
reduce their effectiveness or even prevent
them f rom providing any protect ion .
-An improperly installed child restraint can
interfere with the airbag as it deploys and
serious ly injure or even kill the chi ld.
-Always carefully follow the manufacturer's
instr uctions provided with the child safety
seat or carr ier .
- After checking to make sure that the c hild
restraint is properly installed, make certain
that the child restraint is correctly recog­
n ized by the capacitive passenger detection
system in the front passenger seat and that
the
PASSENGER AIR BAG OFF ~; light sig­
na ls the cor rect front passenger fronta l air­
bag status.
A WARNING
F orwa rd-facing child restra ints:
-Always make sure the forward-facing seat
has bee n des igned and certified by its man­
ufacturer for use on a front seat with a pas­
senger front and side airbag.
-
307

Child safety
-Never put the forward-facing child restraint
up, against or very near the instrument pan­
el.
- Always move the front passenger seat to
the highest position in the up and down ad­
justment range and move it back to the
rearmost position in the seat's fore and aft
adjustment range, as far away from the air­
bag as possible, before installing the for­
ward-facing child restraint.
- Always make sure that the safety belt upper
anchorage is behind the child restraint and
not next to or in front of the child restraint
so that the safety belt will be properly posi­
tioned.
- Make sure that the
PASSENGER AIR BAG
OFF~ ; light comes on and stays on all the
time whenever the ignition is switched on.
A WARNING
Rearward-facing child restraints:
- A child in a rearward-facing child safety seat
installed on the front passenger seat will be
seriously injured and can be killed if the
front airbag inflates -even with an Ad­
vanced Airbag System.
- The inflating airbag will hit the child safety
seat or infant carrier with great force and
will smash the child safety seat and child
against the backrest, center armrest, door
or roof .
- Always be especially careful if you must in­
stall a rearward facing child safety seat on
the front passenger seat in exceptional cir­
cumstances .
- Make sure that the
PASSENGER AIR BAG
OFF~; light comes on and stays on all the
time whenever the ignition is switched on.
- If the
PASSENGER AIR BAG OFF~; light
does not come on and stay on, immediately
install the rear-facing child safety seat in a
rear seating position and have the airbag
system inspected by your Audi dealer .
308
· Activating the convertible locking retractor
Use the convertible locking retractor to secure a
child restraint.
Always heed the child safety seat manufacturer 's
instructions when installing a child restrain t in
your vehicle . To activate the convertible locking
retractor:
.. Place the child restraint on a seat, preferably
on the rear seat .
.. Slowly pull the belt all the way out.
.. Route it around or through the child restraint
belt path
~ ,&. .
.. Push the child safety seat down with your full
weight to get the safety belt really tight.
.. Insert the belt tongue into the buckle for that
seating position.
.. Guide the safety belt back into the retractor un­
til the belt lies flat and snug on the child safety
seat.
.. You should hear a "clicking" noise as the belt
winds back into the inertia reel. Test the con ­
vertible locking retractor by pulling on the belt.
You should no longer be able to putt the belt
out of the retractor. The convertible locking re­
tractor is now activated .
.. Make sure that the red release button is facing
away from the child restraint so that it can be
unbuckled quickly.
.. Pull on the belt to make sure the safety belt is
properly tight and fastened so that the seat
cannot move forward or sideways more than
one inch (2 .5 cm) .
A WARNING
Using the wrong child restraint or an improp­
erly installed child restraint can cause serious
personal injury or death in a crash.
- Always make sure that the safety belt re­
tractor is locked when installing a child
safety seat. An unlocked safety belt retrac­
tor cannot hold the child safety seat in place
during normal driving or in a crash.
- Always buckle the child safety seat firmly in
place even if a child is not sitting in it. A
loose child safety seat can fly around during
a sudden stop or in a crash.

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-Always make sure the seat backrest to which
the child restraint is installed is in an up­
right position and securely latched into
place and cannot fold forward. Otherwise,
the seatback with the child safety seat at­
tached to it could f ly forward in the event of
an accident or other emergency situation.
- Always read and heed all WARNINGS when­
ever using a child restrained in a veh icle is
being used
c::> page 295. Specia l precaut ions
apply when installing a child safety seat on
the front passenger seat
c::> page 2 72, Child
restraints on the front seat -some impor­
tant things to know.
Deactivating the convertible locking
retractor
The convertible locking retractor for child re­
straints will be deactivated automatically when
the belt is wound all the way back into the re­
tractor .
~ Press the red button on the safety belt buckle.
The belt tongue will pop out of the buckle.
~ Guide the safety belt all the way back into its
stowed position .
Always let the safety belt retract completely into
its stowed position. The safety belt can now be
used as an ordinary safety belt without the con­
vertible locking retractor for child restraints.
If the convertible locking retractor should be ac­
tivated inadvertently, the safety belt must be un­
fastened and guided completely back into its
stowed position to deact ivate this feature. If the
convert ible locking retractor is not deactivated,
the safety belt w ill gradually become tighter and
uncomfortable to wear.
_& WARNING
-
Improperly installed chi ld safety seats in­
crease the risk of serious personal injury and
death in a collision.
-Never unfasten the safety belt to deactivate
the convertible locking retractor for child re­
straints while the vehicle is moving . You
Child safety
would not be restrained and could be seri­
ously injured in an accident.
- Always read and heed all WARNINGS when­
ever using a child restrained in a vehicle is
be ing used
c::> page 295. Special precautions
apply when install ing a child safety seat on
the front passenger seat
c::> page 2 72, Child
restraints on the front seat -some impor­
tant things to know.
LATCH system (lower
anchorages and tethers
for children)
Child Restraint System anchors and how
are they related to child safety
To provide a simpler and more practicab le way to
attach the child restraint on the vehicle seat,
Federal regulations require special lower ancho­
rages in vehicles and devices on new child re­
straints to attach to the vehicle anchorages .
In the United States, the combination of the
tether anchorages and the lower anchorages is
now generally called the LATCH system for
" Lower Anchorages and Tethers for Children". In
Canada, the terms
"top tether" with "lower uni­
versa l anchorages" (or "lower universal anchor­
age bars") are used to descr ibe the system .
In other countries the term "ISOFIX" is used to
describe the lower anchorages .
Forward-facing child restraints manufactured af­
ter September
1, 1999, are required by U.S. fed­
eral regulations to comply with new child head
movement performance req uirements. These
new performance requirements make a tether
necessary on most new ch ild seats.
Installing a child restraint that requires a top
tethe r without one can seriously impair the per­
formance of the child restraint and its ab ility to
pro tect the child in a collision. Installing a child
restra int that requi res a top tether without the
top tether may be a violation of state law.
Child restraint manufacturers offer LATCH lower
anchorages on their child seats w ith hook-on or
..,.
309

Child safety
push-on connectors attached to adjustable
straps.
I n addition to the LATCH lower anchorages, these
chi ld restraint systems usually require the use of
tether straps to he lp keep the child restraint
firm ly in place.
A WARNING
Improper installation of child restraints will
increase the risk of injury and death in a
crash.
- Always follow the instructions provided by
the manufacturer of the child restraint you intend to install in your veh icle.
- Never install a child restraint without a properly attached top tether strap if the
child restraint manufacturer's instruct ions
requ ire the top tether strap to be used.
- Improper use of child restra int LATCH lower
anchorage points can lead to injury in a colli­
s ion . The LATCH lower anchorage points are
designed to withstand on ly those loads im­
posed by cor rect ly fitted child restraints .
- Never mount two child restraint systems on
one LATCH lower anchorage point.
- Never secure or attach any luggage or other
item to the LATCH lower anchorages.
Location
F ig. 253 Schematic overview : LA TCH anchorage point loca­
t ions (example)
The illustration shows the seating locations in
your veh icle which are equipped with the lower
anchorages system.
310
Description
The lower anchorage positions are marked for
quick locating .
Fig. 254 Rear seats: locator buttons for lower anchorages
L o wer anchorage s
The lower anchorage a ttac hment points are lo­
cated between the rear seatback and rear seat
cushion
c:::> fig . 254 .
Lower anchorages secure the child restra int in
the seat without using the vehicle's safety belts.
Anchorages p rovide a secure and easy-to-use at ­
tachment and minimize the possibility of improp­ er child restraint installation.
All child restra ints manufact ured after Septem­
ber 1, 2002, must have lower anchorage attach­
ments for the
LATCH system.
Remember that the lowe r ancho rage points are
on ly intended fo r insta llation and attachment of
child restraints spec ifically cert ified for use with
LATCH lower anchorages. Child restraints that
are not equipped with the lower anchorage at­
tachments can still be installed in compliance
with the child restraint manufacturer's instruc­
tions on using vehicle safety belts.
A WARNING
Improper use of LATCH lower anchorages can
cause ser ious personal injury in an accident.
- Always carefully follow the ch ild restraints
manufacturer's instructions for proper in­
stallation of the child restraint and proper
use of the lower ancho rages or safety belts
in your vehicle.
- Never secure or attach any luggage o r other
items to the
LATCH lower an chorages. ..,

-Always read and heed the important infor­
mation about child restraints in this chapter
and WARNINGS
c> page 295 , Child safety.
Installing a child restraint with LATCH
lower anchorages
Whenever you ins tall a child restraint always fol­
low the child restraint manufacturer's instruc ­
tions .
Fig. 255 Lo we r anch orag es: proper mou nting
Mounting
.,. Make sure the seatback of the rear seat bench
is in the upright position and securely latched
in place .
.,. Remove th e covers to access the lower anchor­
age brackets .
.,. Attach both hook-on connectors with the spring
catch release on the child safety seat onto the
LATCH lower anchorage so that the connectors
lock into place
c> fig . 255 .
.,. Pull on the connector attachments to make
s u re they a re properly attached to the LA TCH
l ower anchorage .
.,. Pull straps tight fo llowing the child restraint
manufacturer's instructions.
Releasing
.,. Loosen the te nsion on the straps following the
c hild rest rai nt man ufacturer's inst ruct io ns .
.,. Depress the spring catches to release the an­
chorage hooks from the lower anchorages .
Remember : Use tether straps to he lp keep the
a ch ild restraint firm ly in place . al ~ N ...... N ~ 0 0
~ al
Child sa fety
A WARNING
-Improper use of the LATCH system can in-
crease the risk of serious personal injury and
death in an accident .
- These anchors were developed only for child
safety seats using the
"LATCH " system.
- Never attach other ch ild safety seats, be lts
or other objects to these anchors .
- Always make sure that you hear a click when
latching the seat in place . If you do not hear
a click the seat is not secure and co uld f ly
forward and hit the inter ior of the vehicle,
or be ejected from the vehicle .
A WARNING
-Imp roper insta llation of child restra ints w ill
i nc rease the risk of injury in a n accident.
- Always follow the ch ild restraint system
manufacture r's instruc tions fo r proper in­
stallat ion of the chi ld restrain t system and
p roper use of tether straps as well as the
lower ancho rages or safety belts in your ve ­
h icle.
- Always read and heed the important infor ­
mation and WARNINGS about ch ild safety
and the installation of child restrai nt sys­
tems
c>page 295, Child safety .
311

Child safety
Tether anchors and tether straps
Applies to: Sedan
Fig . 256 Te th er ancho rs : re ce ss f la ps beh ind the rear se at­
bac ks
Applies to: a llroa d
Fig. 257 Te ther ancho rs : atta chm ent hoo k loc atio ns be­
hind the rea r se atb ack s
Appl ies to: Seda n: The tether ancho rs fo r the rear
seating positions a re located in recesses in the
rear w indow shelf .
Applies to: allroad: The tether anchors fo r the
rear seating posit ions are located on the backside
of the rear seatbacks .
A tether is a straight or V-shaped strap that at­
taches the top part of a ch ild restra int to specia l
anchorage points in the vehicle .
T he purpose of the tether is to reduce the for ­
ward movement of the child restraint in a crash,
i n order to help reduce the risk of head in jury
that could be caused by striking the veh icle inte ­
rio r.
Forward facing child restraints ma nufactured af­
ter September 1, 1999, are required by U .S. fed­
eral regulations to comply with new child head
movement performance requirements . T hese
new perfo rmance requirements make a tethe r
necessary on most n ew ch ild safety seats .
312
A WARNING
Improper installation of child restraints will
increase the risk of injury and death in a
crash .
- Always follow the instructions provided by
the manufacturer of the ch ild restraint you
intend to install in your Audi .
- Improper use of chi ld restraint anchors (in ­
cluding tether anchors) can lead to injury in
a co llision . The anchors are designed to
w ithstand only those loads imposed by cor­
rectly fitted ch ild restraints.
- Never mo unt two ch ild rest raint systems on
one LATC H lower anchor poin t.
- Never attach two child restraint systems to
one tether st rap or tethe r anchorage.
- Never attach a tether strap to a tie-down
hook in the luggage compa rtment .
- Never use child restra int tether anchorages
to secure safety belts or other kinds of occu­
pant restraints.
- Never secure or attach any luggage o r other
items to the LATCH lowe r anchorages or to
the tether anchors .

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risk of damaging the fuel tank system and
the engine . See an authorized Audi dealer or
authorized Audi Serv ice Facility for ass is­
tance.
-Ad B lue attacks surfaces such as painted ve­
hicle components, plastic and carpet. Re­
move the fluid as quickly as poss ible with a
damp cloth and plenty of cold wa ter. If the
Ad Blue has already crystallized, use warm
water and a sponge . Ad Blue residue that is
not removed will crystallize and can damage
the affected surface .
-Do not store refill bott les or canisters per­
manent ly in the veh icle. If the container
l ea ks, the escaping AdBl ue could damage
the veh icle inter ior.
-Do not allow AdBlue to come into contact
with clothing. If there is contact with the
fluid , flush immed iate ly w ith plenty of wa­
ter.
@ Tips
F ollow the Ad Blue m anufact urer's instr uc­
tions fo r use and storage .
Refilling AdBlue using a pump
Applies to: vehicles with selective catalytic reduction
.,. Open th e tank fi ller door ¢ page 317, fig . 260.
.,. T u rn the tank filler neck cap to the left to re­
move
c:> page 320 , fig . 264.
.,. Refill AdBlue un til the pump no zzle swit ches
off for the first time ¢ (\1) .
.,. Close the filler neck . ¢ page 322, Completing
AdBlue refill
0 Note
-The pump nozzle handle must be pointing downward when filling . Otherwise the
pump noz zle w ill not sw itch
off automat i­
ca lly
c:> Q) in Preparation on page 320.
-Do not continue filling once the pump noz­
zle automatically switches
off for the first
time . The AdBlue ta nk system could be
overfilled and leak Ad B lue
c:> (D in Prepara­
tion on page 320 .
Check ing and Filling
Refilling AdBlue using a canister
Applies to: vehicles with selective catalytic reduction
+®
Fig. 265 Can is te r w it h attachab le hose
.,. Remove the cover from the refill canis te r¢ .&.
in Preparation on page 3 20, ¢ (Din Prepara ­
tion on page 320 .
.,. Secure the end of the hose(!) on the open ing in
t he canister @by turn ing the hose to the rig ht.
.,. Remove the cap @from the other end of the
hose @ .
.,. Position the end of the hose @ on the filler
neck in the vehicle and turn the hose to the
r ight to tighten it .
.,. Lift the canister up and then tip it. Cont inu e
holding the canis ter in a tipped pos it ion until i t
is empty or until no more flu id flows into the
tank .
.,. Remove the canis ter and close the filler t ube
c:> page 322, Completing AdBlue refill .
(D Note
Only use refill canisters that a re approved fo r
your vehicle. Using ot her systems ca n cause
Ad B lue to leak.
© Tips
- An authorized Aud i dealer o r autho rized
Audi repair facility can tell you wh ich refill
canisters are approved for your vehicle.
- A permitted refill ca niste r contains app roxi­
mately 1.3 gallons (5 l ite rs) of Ad Blue .
Refilling AdBlue using a bottle
Applies to: vehicles with selective catalytic reduction
.,. Remove the cap from the refill bo ttle c:> .&. in
Preparation on page 3 20,
c:> (D in Preparation
on page 320 .
.,.
321

Checking and Filling
_& WARNING
California Proposition 65 Warning:
- Engine exhaust, some of its constituents ,
and certain vehicle components contain or emit chemicals known to the State of Cali­
fornia to cause cancer and birth defects and reproductive harm. In addition, certain flu ­
ids contained in vehicles and certain prod­
ucts of component wear contain or emit
chemicals known to the State of California
to cause cancer and birth defects or other reproductive harm.
- Battery posts, terminals and related acces­
sories contain lead and lead compounds, chemicals known to the State of California
to cause cancer and reproductive harms.
Wash hands after handling.
(D Note
When filling fluids, be sure not to mix the flu­ ids up . Otherwise severe malfunctions and
en­
gine damage will occur.
@ For the sake of the environment
You should regularly check the ground under
your vehicle in order to detect leaks quickly . If
there are visible spots from oil or other fluids,
bring your vehicle to an authorized Audi deal­
er or authorized Audi Service Facility to be
checked.
Opening and closing the hood
The hood is released from ins ide the vehicle.
Fig. 266 Drive r footwell : rele ase le v er
324
Fig. 267 Unlocked hood: lev er
Make sure the wiper arms are not raised up from
the windshield. Otherwise the paint could be
damaged .
Opening the hood
"'With the driver's door open, pull the lever be­
low the instrument panel in the direction of the
arrow
9 fig . 266 .
"' Raise the hood slightly 9 ,&.
"'Press the lever ~ fig. 267 in the direction of the
arrow. This releases the hooks.
"' Open the hood.
Closing the hood
"' Push the hood down until you override the
force of the struts .
"'Let the hood fall lightly into the latch . Do not
press it in.
9 ,& .
_& WARNING
-Never open the hood when there is steam or
coolant escaping from the engine compart­
ment, because there is a risk that you could
be burned. Wai t until no steam or coolan t is
escaping.
- For safety reasons, the hood must always be
closed securely while driving . Because of
this, always check the hood after closing it
to make sure it is latched correctly . The
hood is latched if the front corners cannot
be lifted .
- If you notice that the hood is not latched
while you are driving, stop immediately and
close it, because driving when the hood is
not latched increases the risk of an accident.
,...