2017 AUDI S4 ECU

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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¢
page 277. Specia l precaut ions
apply when installing a child safety seat on
the front passenger seat
¢ page 2 54, 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
¢ page 2 77. Special precautions
apply when install ing a child safety seat on
the front passenger seat¢
page 254, 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 ..,.
291

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
Fig. 234 Schem atic overv iew : LA TCH ancho rage point loca­
t io ns
The illustration shows the seating locatio ns in
your veh icle which are equipped with the lower
anchorages system.
292
Description
The lower anchorage positions are marked for
quick locating .
Fig. 235 Second row of s eats: locator b uttons for lowe r an­
cho rages
Lower anch orage s
The lower anchorage attachment points are lo­
cated between the rear seatback and rear seat
cush io n
¢ fig . 235.
Lower anchorages secure the child restraint in
the seat without using the vehicle's safety belts.
Anchorages prov ide a secure and easy-to-use at­
tachment and minimize the poss ib ility of improp ­
er child restraint installat ion .
All child restraints manufactured after Septem­ ber 1, 2002, must have lower anchorage attach­
ments for the
LATCH system.
Remember that the lower anchorage points are
only intended for installation and attachment of
ch ild restraints spec ifically certified for use with
LATCH lower anc horages. Child restra ints that
are not eq uipped w ith the lower anchorage at­
tachments can still be installed in compl iance
with the ch ild restraint manufacture r's i nstr uc­
tions on using vehicle safety bel ts.
A WARNING
Improper use of LATCH lower anchorages can
cause ser ious persona l 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 anchorages or safety belts
in your vehicle .

-Never secure or attach any luggage or other
items to the
LATCH lower anchorages .
- Always read and heed the important infor­
mation about child restraints in this chapter
and WARNINGS
c:> page 277, Child safety.
Installing a child restraint with LATCH
lower anchorages
Whenever you install a child restraint always fol­
low the child restraint manufacturer's instruc­
tions .
Fig. 236 Lower anchorages: p roper mount ing
Mounting
.. Make s ure the seatback of the rear seat bench
i s in the upr igh t position and secu rely latched
in place .
.. Remove the 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 . 236 .
.. Pull on the connector attachments to make
s ur e they a re prope rly attached to the LA TC H
lower anchorage .
.. Pull straps tight fo llowing the child restra int
manufacturer's instructions.
Releasing
.. Loosen the tension on the straps following the
ch ild rest raint man ufactu rer's inst ruct ions .
.. Depress the spri ng catches to release the an­
chorage hooks from the lower anchorages .
Remember: Use tether straps to he lp keep the
chi ld restraint f irmly in place .
Child sa fety
A WARNING
-Improper use of the LATCH system can in-
crease the ris k of serious persona l injury a nd
death in a n 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 sec ure and co uld f ly
forward and hit the inter ior of the vehicle,
or be ejected from the veh icle.
A WARNING
-I mp roper insta llation of child restra ints w ill
i n cr ease the risk of injury in an accide nt.
- Always follow the ch ild restraint system
manufac ture r's instruc tions fo r proper in­
stallat io n of t he chi ld restrain t system and
p roper use of tether straps as well as the
lower ancho rages or safety belts in yo ur ve ­
h icle.
- Always read and hee d the important info r­
mation and WARN INGS about ch ild safety
and the installation of child restrai nt sys­
tems
c> page 2 77, Child safety .
Tether anchors and tether straps
Fig. 23 7 Tet her anchors: recess flaps beh ind the rear set­
backs
The tether anchors for the rear seat ing pos itions
are located in recesses in the rear window shelf .
A tether is a straight or V-shaped strap that at­
taches the top part of a ch ild restraint to special
anchorage poi nts in the veh icle. ..,
293

Child safety
The purpose of the tether is to reduce the for­
ward movement of the child restraint in a crash,
in order to help reduce the risk of head injury
that could be caused by striking the vehicle inte­ rior .
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 requirements . These
new performance requirements make a tether
necessary on most new child safety seats .
A WARNING
Improper installation of child restraints will
increase the r isk of injury and death in a
crash.
- Always follow the instructions provided by
the manufacturer of the child restraint you
intend to ins tall in your Audi.
- Imprope r use of child restra int anchors (in­
cl ud ing tether anchors) can lead to in jury in
a collision. The anchors are designed to
withstand only those loads imposed by cor­
rectly f itted child restraints .
- Never mount two child restraint systems on
one LATCH lower anchor point .
- Never attach two child restrai nt systems to
one tether strap or tether anchorage.
- Never a ttach a tether strap to a t ie -down
hoo k in the luggage compartment.
- Never use ch ild restraint tether an chorages
to sec ure safety belts or other k inds of occ u­
pant restraints.
- Never secure or a ttach any luggage or other
items to the LATCH lower anchorages or to
the tether anc ho rs.
294
Installing the upper tether strap on the
anchorage
Fig. 238 Tet her s tra p: prope r rout ing an d mo unting
Install ing the tether strap
.,. Release or deploy the tether strap on the ch ild
restraint according to the ch ild restraint manu­
facture r's instructions.
.,. Guide the upper te ther strap
under the rear
head rest raint (raise the head restra int if neces­
sary) . For child restraints with V -tether straps,
always make sure that the head restraint guide
rods do not interfere with any part of the top
tether strap.
.,. Tilt the recess f lap up to expose the anchor
bracket.
.,. Attach the tether st rap anchorage hook into
the opening of the tether anchorage .
.,. Pull on the tether strap hook so that the spring
catch of the hook engages .
.,. Ti ghten the tether strap f irm ly following the
child restraint manufacture r's instructions .
Releasing the tether strap
.,. Loosen the tension fo llow ing the child restra int
manufact urer's instr uctions.
.,. Depress the spr ing catch on the hook and re­
lease it from the anchorage.
(D Note
I f you leave the child restra int with the tethe r
strap firmly installed for severa l d ays, this
could leave a mark on the upholstery on the
seat cushion and backrest in the area where
the tether strap was installed. The upholstery
would a lso be permanently stretched a round
the tether strap. T his applies especially to
l eathe r seats .

Checking and Filling
the engine. See an authorized Audi dealer or
authorized Audi Service Facility for assis­
tance.
- Ad Blue attacks surfaces such as painted ve­
hicle components, plastic and carpet. Re­
move the fluid as quickly as possible with a
damp cloth and plenty of cold water. 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 bottles or canisters per­
manently in the vehicle. If the container
leaks, the escaping AdBlue could damage
the vehicle interior.
- Do not allow Ad Blue to come into contact
with clothing.
If there is contact with the
fluid , flush immediately with plenty of wa­
ter.
(D Tips
Follow the Ad Blue manufacturer 's instruc­
tions for use and storage.
Refilling AdBlue using the bottle
Applies to: veh icles with selective catalyt ic reduction
.. Remove the cap from the refill bottle¢ A in
Preparation on page 301,
~ CD in Preparation
on page 301.
.. Position the bottle on the filler tube and turn
the bottle clockwise until it stops turning.
.. Press lightly against the bottom of the bottle
to empty it. Continue pressing the bottom of
the bottle until it is empty or until fluid stops
flowing into the tank.
.,. Remove the bottle and seal the filler neck
¢ page 303, Completing AdBlue refill.
(D Note
Only use refill bottles that are approved for
your vehicle. Using other systems can cause
Ad Blue to leak.
(j) Tips
- You can obtain refill bottles from an author­
ized Audi dealer or authorized Audi Service
Facility.
302
- A permitted refill bottle contains approxi­
mately 0.5 gallon (1.9 liters) of AdBlue.
Refilling AdBlue using a canister
Applies to: vehicles with selective catalyt ic reduct ion
@
+®
Fig. 244 Canis te r w ith attachable hose
.,. Remove the cover from the refill canister ¢ A
in Preparation on page 301, ¢(Din Prepara­
tion on page 301 .
.. Secure the end of the hose (Don the opening in
the canister @by turning the hose to the right .
.. 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
right to tighten it .
.,. Lift the canister up and then tip it. Continue
holding the canister in a tipped position until it
is empty or until no more fluid flows into the
tank .
.. Remove the canister and close the filler tube
¢ page 303, Completing AdBlue refill .
([) Note
Only use refill canisters that are approved for
your vehicle. Using other systems can cause
AdBlue to leak.
(D Tips
- An authorized Audi dealer or authorized
Audi repair facility can tell you which refill
canisters are approved for your vehicle .
- A permitted refill canister contains approxi­
mately 1.3 gallons (5 liters) of Ad Blue.

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
reproduct ive harm.
- Battery posts, terminals and related acces­
sories contain lead and lead compounds,
chem icals known to the State of California
to cause cance r and rep roductive harms.
Wash hands after handling.
(D Note
When filling flu ids, be sure not to mix the flu­
ids up . Otherwise severe ma lfunctions and en­
gine damage w ill occur.
@ For the sake of the environment
You should regularly check the grou nd under
your veh icle in order to detect Leaks qu ickly . If
there are v isible spots from oil or other fluids,
bring your vehicle to an authorized Aud i dea l­
er or authorized Audi Service Facility to be
checked.
Opening the hood
The hood is released from the interior.
F ig. 2 45 Dri ver fo otw ell : rele ase leve r
Checki ng an d Fill in g
Fig. 246 Unlocke d hood: lever
Make sure the wiper arms are not raised up from
the windshield. Otherwise the paint could be
damaged .
.,. With the driver's door open, pull the lever be­
low the instrument pane l in the direction of the
arrow
c;> fig. 245 .
.,. Raise the hood slightly c;> ,&. .
.,. Press the lever c;> fig. 246 in the direct ion of the
arrow. This releases the hooks .
.. Open the hood .
A WARNING
-
Never open the hood if you can see steam or
coolant escaping from the engine compart­ ment, because this increases the risk of
burns. Wait until no steam or coolant is es­
cap ing .
Closing the hood
.,. Push the hood down until you override the
force of the str uts .
.,. Let the hood fall lightly into the latch .
Do not
press it in.
c;> &_ .
A WARNING
-===
If the hood is not latched complete ly, it could
fly up wh ile you are driving and obstruct your
vis ion.
- For safety reasons, the hood must always be
closed securely while driv ing. 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.
~
305

Check ing and F illing
CJ) Note
Driving with an insufficient oil level is likely to
cause severe damage to the engine .
@ Tips
-The oil pre ssure warn ing display. is not
an ind icato r of the oil l evel. Do not rel y on
it. In stead , che ck th e oil le vel in your e n­
gi ne a t regul ar int ervals, prefe rably e ach
t ime you re fuel , and al ways befo re go ing
on a long trip .
-If you have the impression your engine con­
sumes excessive amounts of oil, we recom­
mend that you consult an authorized Aud i
dealer to have the cause of your concern
properly d iagnosed . Keep in mind that the
accurate measurement of oil consumpt ion
r equi res great ca re and may take some
time. An authorized Audi dealer has instruc­
tions about how to measure oil consump­
tion accurately.
Checking the engine oil level
The engine oil level can be checked in the Info­
tainment system
.. Park you r vehicle on a level surface.
.. Shut the engine off when it is warm.
.. Switch only the ignition back on.
.. Wait approximately two minut es .
.. Se lect in the Infotainment system: the
I MENU I
button > Ve hicle > left cont rol button > S er vice
& c h ecks > Oil lev el.
.. Check the oil level in the Infotainment system
display . Add engine oil if the bar in the oil level
indicato r is near "min "¢
page 308 .
The engine oil consumpt ion may be up to
0 .5 quart pe r 600 miles (0.5 l iter/1,000 km), de­
pending on driving style and operating condi­
tions. Consumption may be highe r d uring the
fi rst 3 ,000 mi les (5,000 km). Because of this, the
engine o il level must be checked regu larly. I t
wou ld be best to check each time you refuel your
vehicle and before long drives .
308
(D Tips
The oil level indicator in the disp lay is only an
i nformat ional disp lay .
If the oil leve l is too
l ow, a min imum oil warning appears in the in­
strument cluster. Add oil and close the hood.
The current oil level is displayed in the instru ­
ment cluster the next t ime the ignition is
switched on.
Adding engine oil F ig. 248 E n gin e compartment : engine oil f ille r open ing
cover
.. Read a nd follo w all WARNIN GS before check­
ing anything in the engine compartment ¢
A
in Working in the engine compartment on
page 304 .
.. Turn the engine off .
.. Unscrew the cap
ce--: for the engine oil filling
opening <=>
fig. 248, <=> page 306 .
.. Carefully add 0 .5 quart (0.5 l iter) of the correct
oil ¢
page 306.
.. Check the oil level aga in after two minutes
¢ page 308, Checking the engine oil level .
.. Add more o il if necessary.
.. Close the engine oi l filler opening cap .
A WARNING
-When adding oil, do not let oil drip onto hot
engine components. This increases the risk
of a fire.
- You must secure the cap on the oil f iller
open ing correctly so that oil does not leak
out onto the hot engine and exhaust system
when the engine is runn ing, because this is
a fire hazard .
- Always clean sk in thoroughly if it comes into
contact with eng ine oil.

Checking and Filling
Cooling system
Coolant
The engine coo ling system is filled with a mixture
of pur ified water and coolan t addit ive at the fa c­
tory. This coo lant must not be not changed.
The coolant leve l is monito red throug h the . in­
dicator light~
page 31. Howeve r, we do recom­
mend occasionally check ing the coo lan t level
manually.
I f you must add coolant, use a m ixture of water
and coolant additive. M ixing the coolant additive
with d istilled wate r is recommended.
Coolant additive
The coolant additive is made of anti-freezing a nd
corros ion protection agents. Only use the fo llow­
ing coo lant add it ives. These additives may be
m ixed w ith each other.
Coolant additive Specification
G13
TL 774)
G12++ TL 774 G
The amount of coo lant add itive that needs to be
mixed w it h water depends on the climate where
the vehicle will be operated. If the coolant addi­
tive percentage is too low, the coolant can freeze
and damage the engine.
Coolant Freeze protec-
additive tion
Warm min. 40% m in. -13 °F
reg ions max. 45% (-25 °C)
Cold min. 50% max. -40 °F
reg ions max. 55% (-40 °C)
(D Note
- Befo re the start of winter, have your author­
i zed Audi dealer or authorized A udi Service
Fac ility check if the coolant additive in yo ur
vehicle matc hes the percentage approp riate
fo r the climate. Th is is especially important
when driving in co lde r climates.
- If the appropriate coolant additive is not
available in an emergency, do not add any
other additive. You cou ld damage the en-
310
gine . If this happens, only use water and re ­
store the correct m ixt ure ratio with the
specified coo lant add itive as soon as poss i­
ble.
- On ly ref ill with new coolant .
- Rad iator sealant mus t not be mixed wi th
the coolant.
Adding coolant
Fig. 24 9 Eng ine co mpart m ent: re lease button on coolant
expansio n tank
Check ing the engine coolant level
.,. Park your veh icle on a level surface.
.,. Switch the ignit ion off.
.,. Read the coolant level on the coolant expansion
tank
c:> fig . 249 .
.,. The coolant leve l mus t be between the MIN and
MAX mar kings when the engine in co ld. Whe n
t he engi ne is warm i t ca n be sligh tly above the
MAX mar kin g.
Adding coolant
.,. Let the engi ne cool down.
.,. Place a cloth over the coo lant expansion tank
cap.
.,. Push the rele ase button¢
fig. 249 and carefu l­
ly unsc rew the cap to the left un til you feel re­
sis tance ¢,&. .
.,. Push the release button again and remove the
cap completely.
.,. Make sure that the fluid level remains stab le.
Add more coolant if necessary .
.,. Turn the cap to the right to secure it until you
feel res istance a second time.
Coolant loss usually ind icates there is a leak. Im­
med iate ly dr ive your vehicle to an author ized
Audi dealer or authorized A udi Service Fac ility ..,.