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Subaru WRX STI (2019 year). Instruction - part 26

(425,1)

北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

NOTE

The air pressure in a tire

increases by approximately 4.3
psi (30 kPa, 0.3 kgf/cm

) when the

tire becomes warm.

The tires are considered cold

when you have parked the vehi-
cle for at least three hours or
have driven less than one mile
(1.6 km).

WARNING

Do not let air out of warm tires
to adjust pressure. Doing so
will result in low tire pressure.

Incorrect tire pressures detract from
controllability and ride comfort, and
they cause the tires to wear abnor-
mally.

Correct tire pressure (tread worn

evenly)

Roadholding is good, and steering
is responsive. Rolling resistance is
low, so fuel consumption is also
lower.

Under inflated tire (tread worn on

shoulders)

Rolling resistance is high, so fuel
consumption is also higher.

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Maintenance and service/Tires and wheels

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Over inflated tire (tread worn in

the center)

Ride comfort is poor. Also, the tire
magnifies the effects of road-sur-
face bumps and dips, possibly
resulting in vehicle damage.

If the tire placard shows tire pres-
sures for the vehicle when fully
loaded, adjust the tire pressures to
the values that match the loading
conditions.

WARNING

Driving at high speeds with
excessively low tire pressures
can cause the tires to deform
severely and to rapidly heat
up. A sharp increase in tem-
perature could cause tread
separation, and destruction of
the tires. The resulting loss of
vehicle control could lead to
an accident.

Wheel balance

Each wheel was correctly balanced
when your vehicle was new, but the
wheels will become unbalanced as
the tires become worn during use.
Wheel imbalance causes the steer-
ing wheel to vibrate slightly at
certain vehicle speeds and detracts
from the vehicle’s straight-line sta-
bility. It can also cause steering and
suspension system problems and
abnormal tire wear. If you suspect
that the wheels are not correctly
balanced, have them checked and

adjusted by your SUBARU dealer.
Also have them adjusted after tire
repairs and after tire rotation.

CAUTION

Loss of correct wheel align-
ment causes the tires to wear
on one side and reduces the
vehicle’s running stability.
Contact your SUBARU dealer
if you notice abnormal tire
wear.

NOTE

The suspension system is de-
signed to hold each wheel at a
certain alignment (relative to the
other wheels and to the road) for
optimum straight-line stability
and cornering performance.

Maintenance and service/Tires and wheels

11-34

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Wear indicators

1) New tread
2) Worn tread
3) Tread wear indicator

Each tire incorporates a tread wear
indicator, which becomes visible
when the depth of the tread grooves
decreases to 0.063 in (1.6 mm).
Replace the tire when the tread
wear indicator appears as a solid
band across the tread.

WARNING

When a tire’s tread wear indi-
cator becomes visible, the tire
is worn beyond the acceptable
limit and you must replace it
immediately. With a tire in this
condition, driving at high
speeds in wet weather can
cause the vehicle to hydro-
plane. The resulting loss of
vehicle control can lead to an
accident.

NOTE

For safety, inspect tire tread
regularly and replace the tires
before their tread wear indicators
become visible.

Rotational direction of tires

Example of rotational direction
marked on the sidewall
1) Front

If the tires have specific rotational
direction, refer to the arrow marked
on the side wall.

The arrow should be pointing for-
ward when the wheels are fitted.

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Maintenance and service/Tires and wheels

11-35

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Tire rotation

Vehicles equipped with 4 non-
unidirectional tires
1) Front

Vehicles equipped with unidir-
ectional tires
1) Front

Tire wear varies from wheel to
wheel. Move the tires to the posi-
tions shown in the illustration each
time they are rotated. For the tire
rotation schedule, refer to the “War-
ranty and Maintenance Booklet”.

Replace any damaged or unevenly
worn tires at the time of rotation.
After tire rotation, adjust the tires
pressures and make sure the wheel
nuts are correctly tightened.

After driving approximately 600

miles (1,000 km), check the wheel
nuts again and retighten any nut
that has become loose.

Tire replacement

The wheels and tires are important and
integral parts of your vehicle’s design; they
cannot be changed arbitrarily. The tires
fitted as standard equipment are optimally
matched to the characteristics of the
vehicle and were selected to give the best
possible combination of running perfor-
mance, ride comfort, and service life. It is
essential for every tire to have a size and
construction matching those shown on the
tire placard and to have a speed symbol
and load index matching those shown on
the tire placard.

Using tires of a non-specified size detracts
from controllability, ride comfort, braking
performance, speedometer accuracy and
odometer accuracy. It also creates incor-
rect body-to-tire clearances and inappro-
priately changes the vehicle’s ground
clearance.

All four tires must be the same in terms of
manufacturer, brand (tread pattern), con-
struction, and size. You are advised to
replace the tires with new ones that are
identical to those fitted as standard equip-

Maintenance and service/Tires and wheels

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

ment.

For safe vehicle operation, SUBARU
recommends replacing all four tires at the
same time.

WARNING

When replacing or installing

tire(s), all four tires must be the
same for the following items.

(a) Size

(b) Circumference

(c) Speed symbol

(d) Load index

(e) Construction

(f) Manufacturer

(g) Brand (tread pattern)

(h) Degrees of wear

For items (a) to (d), you must
obey the specification that is
printed on the tire placard. The
tire placard is located on the
driver’s door pillar.

If all four tires are not the same in
items (a) to (h), there is a possi-
bility that it may lead to serious
mechanical damage to the drive
train of your car and affect the

following factors.

– Ride

– Handling

– Braking

– Speedometer/Odometer cali-

bration

– Clearance between the body

and the tires

It also may be dangerous and
lead to loss of vehicle control,
and it can lead to an accident.

Use only radial tires. Do not use

radial tires together with belted
bias tires and/or bias-ply tires.
Doing so can dangerously re-
duce controllability, resulting in
an accident.

Wheel replacement

When replacing wheels due, for example,
to damage, make sure the replacement
wheels match the specifications of the
wheels that are fitted as standard equip-
ment. Replacement wheels are available
from SUBARU dealers.

WARNING

Use only those wheels that are

specified for your vehicle. Wheels
not meeting specifications could
interfere with brake caliper opera-
tion and may cause the tires to rub
against the wheel well housing dur-
ing turns. The resulting loss of
vehicle control could lead to an
accident.

NOTE

When any of the wheels are removed
and replaced for tire rotation or to
change a flat tire, always check the
tightness of the wheel nuts after driving
approximately 600 miles (1,000 km). If
any nut is loose, tighten it to the
specified torque.

Maintenance and service/Tires and wheels

11-37

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Alloy wheels

Alloy wheels can be scratched and da-
maged easily. Handle them carefully to
maintain their appearance, performance,
and safety.
.

When any of the wheels are removed

and replaced for tire rotation or to change a
flat tire, always check the tightness of the
wheel nuts after driving approximately 600
miles (1,000 km). If any nut is loose,
tighten it to the specified torque.
.

Never apply oil to the threaded parts,

wheel nuts, or tapered surface of the
wheel.
.

Never let the wheel rub against sharp

protrusions or curbs.
.

When wheel nuts, balance weights, or

the center cap is replaced, be sure to
replace them with genuine SUBARU parts
designed for alloy wheels.

Windshield washer fluid

CAUTION

Never use engine coolant as washer
fluid because it could cause paint
damage.

Windshield washer fluid warning in-
dicator

When there is only a small amount of
washer fluid remaining, the windshield
washer fluid warning indicator will illumi-
nate. When this occurs, refill the washer
fluid as follows.

Remove the washer tank filler cap, then
add windshield washer fluid until it reaches
the “FULL” mark on the tank. If windshield
washer fluid is unavailable use clean
water.

In areas where water freezes in winter, use
an anti-freeze type windshield washer
fluid. SUBARU Windshield Washer Fluid
contains 58.5% methyl alcohol and 41.5%
surfactant, by volume. Its freezing tem-
perature varies according to how much it is
diluted, as indicated in the following table.

Maintenance and service/Alloy wheels

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Washer Fluid

Concentration

Freezing

Temperature

30%

10.48F (−128C)

50%

−48F (−208C)

100%

−498F (−458C)

In order to prevent freezing of washer fluid,
check the freezing temperatures in the
table above when adjusting the fluid
concentration to the outside temperature.
If you fill the reservoir tank with a fluid with
a different concentration from the one
used previously, purge the old fluid from
the piping between the reservoir tank and
washer nozzles by operating the washer
for a certain period of time. Otherwise, if
the concentration of the fluid remaining in
the piping is too low for the outside
temperature, it may freeze and block the
nozzles.

CAUTION

Adjust the washer fluid concen-

tration appropriately for the out-
side temperature. If the concen-
tration is inappropriate, sprayed
washer fluid may freeze on the
windshield and obstruct your
view, and the fluid may freeze in
the reservoir tank.

State or local regulations on

volatile organic compounds may
restrict the use of methanol, a
common windshield washer anti-
freeze additive. Use washer fluids
containing non-methanol anti-
freeze agents only if they provide
cold weather protection without
damaging your vehicle’s paint,
wiper blades or washer system.

Replacement of wiper blades

Grease, wax, insects, or other material on
the windshield or the wiper blade results in
jerky wiper operation and streaking on the
glass. If you cannot remove the streaks
after operating the windshield washer or if
the wiper operation is jerky, clean the outer
surface of the windshield and the wiper
blades using a sponge or soft cloth with a
neutral detergent or mild-abrasive cleaner.
After cleaning, rinse the windshield and
wiper blades with clean water. The wind-
shield is clean if beads do not form when
you rinse the windshield with water.

CAUTION

Do not clean the wiper blades

with gasoline or a solvent, such
as paint thinner or benzine. This
will cause deterioration of the
wiper blades.

When you are going to raise the

passenger-side wiper arm, first
raise the driver-side wiper arm.
Otherwise, the passenger-side
wiper assembly and driver-side
wiper assembly will touch each
other, possibly resulting in
scratches.

Return the passenger-side wiper

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Maintenance and service/Replacement of wiper blades

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

arm to its original position before
returning the driver-side wiper
arm to its original position. Other-
wise, the passenger-side wiper
assembly and driver-side wiper
assembly will touch each other,
possibly resulting in scratches.

While removing the wiper blades

from the wiper arms, do not
return the wiper arms to the
original positions. Otherwise,
the windshield surface may be
scratched.

When returning the raised wiper

arms to the original positions,
carefully return the wiper arms
on the windshield by hand. You
should not return the wiper arms
to the windshield only by the
return spring. Otherwise, the wi-
per arms may be deformed and/or
the windshield surface may be
scratched.

If you cannot eliminate the streaking even
after following this method, replace the
wiper blades using the following proce-
dures.

Windshield wiper blade as-
sembly

1. Raise the wiper arm off the windshield.

CAUTION

Hold the wiper arm when replacing
the wiper blade. Holding the wiper
blade, may result in blade deforma-
tion.

Stopper

2. Remove the wiper blade assembly by
holding its pivot area and pushing it in the
direction shown by the arrow while depres-
sing the wiper blade stopper.
3. Install the wiper blade assembly to the
wiper arm. Make sure that it locks in place.
4. Hold the wiper arm by hand and slowly
lower it in position.

Maintenance and service/Replacement of wiper blades

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Windshield wiper blade rub-
ber

Metal support

1. Grasp the locked end of the blade
rubber assembly and pull it firmly until the
stoppers on the rubber are free of the
metal support.

Metal spines

2. If the new blade rubber is not provided
with two metal spines, remove the metal
spines from the old blade rubber and install
them in the new blade rubber.

3. Align the claws of the metal support

with the grooves in the rubber and slide the
blade rubber assembly into the metal
support until it locks.

Stopper

4. Be sure to position the claws at the end
of the metal support between the stoppers
on the rubber as shown. If the rubber is not
retained properly, the wiper blade may
scratch the windshield.

Maintenance and service/Replacement of wiper blades

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Battery

WARNING

Before beginning work on or near

any battery, be sure to extinguish
all cigarettes, matches, and light-
ers. Never expose a battery to an
open flame or electric sparks.
Batteries give off a gas which is
highly flammable and explosive.

For safety, in case an explosion

does occur, wear eye protection
or shield your eyes when working
near any battery. Never lean over
a battery.

Do not let battery fluid contact

eyes, skin, fabrics, or paint be-
cause battery fluid is a corrosive
acid. If battery fluid gets on your
skin or in your eyes, immediately
flush the area with water thor-
oughly. Seek medical help imme-
diately if acid has entered the
eyes.

If battery fluid is accidentally
swallowed, immediately drink a
large amount of milk or water,
and seek medical attention im-
mediately.

To lessen the risk of sparks,

remove rings, metal watchbands,
and other metal jewelry. Never
allow metal tools to contact the
positive battery terminal and any-
thing connected to it WHILE you
are at the same time in contact
with any other metallic portion of
the vehicle because a short cir-
cuit will result.

Keep everyone including children

away from the battery.

Charge the battery in a well-

ventilated area.

Battery posts, terminals and re-

lated accessories contain lead
and lead compounds, chemicals
known to the State of California
to cause cancer and reproductive
harm. Batteries also contain
other chemicals known to the
State of California to cause can-
cer.

Wash hands after handling

Cap

Upper level

Lower level

It is unnecessary to periodically check the
battery fluid level or periodically refill with
distilled water.
However, if the battery fluid level is below
the lower level, remove the cap. Fill to the
upper level with distilled water.

CAUTION

Never use more than 10 amperes
when charging the battery because
it will shorten battery life.

Maintenance and service/Battery

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Fuses

CAUTION

Never replace a fuse with one having
a higher rating or with material other
than a fuse because serious damage
or a fire could result.

The fuses are designed to melt during an
overload to prevent damage to the wiring
harness and electrical equipment. The
fuses are located in two fuse boxes.

One is located under the instrument panel
behind the fuse box cover on the driver’s
seat side. To remove the cover, pull it out.

Spare fuses

The other one (main fuse box) is housed in
the engine compartment. Also, the spare
fuses are stored in the fuse box cover.

The fuse puller is stored in the main fuse
box in the engine compartment.

Good

Blown

If any lights, accessories or other electrical
controls do not operate, inspect the corre-
sponding fuse. If a fuse has blown, replace
it.
1. Turn the ignition switch to the “LOCK”/
“OFF” position and turn off all electrical
accessories.
2. Remove the cover.
3. Determine which fuse may be blown.
Look at the back side of each fuse box
cover and refer to “Fuses and circuits”
F12-10.

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Maintenance and service/Fuses

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

4. Pull out the fuse with the fuse puller.
5. Inspect the fuse. If it has blown,
replace it with a spare fuse of the same
rating.
6. If the same fuse blows again, this
indicates that its system has a problem.
Contact your SUBARU dealer for repairs.

Installation of accessories

Always consult your SUBARU dealer
before installing fog lights or any other
electrical equipment in your vehicle. Such
accessories may cause the electronic
system to malfunction if they are incor-
rectly installed or if they are not suited for
the vehicle.

Replacing bulbs

WARNING

Bulbs may become very hot while
illuminated. Before replacing bulbs,
turn off the lights and wait until the
bulbs cool down. Otherwise, there is
a risk of sustaining a burn injury.

CAUTION

Replace any bulb only with a new

bulb of the specified wattage.
Using a bulb of different wattage
could result in a fire. For the
specified wattage of each bulb,
refer to “Bulb chart” F12-14.

Do not touch the glass portion of

the light bulb with bare hands.
When holding the glass portion is
unavoidable, hold it using with a
clean dry cloth to avoid getting
moisture and grease on the bulb.
If there is any fingerprints or
grease on the bulb surface, wipe
them away with a soft cloth
moistened with alcohol. Also, if
the bulb is scratched or dropped,
it may blow out or crack.

Maintenance and service/Installation of accessories

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Headlights (models with LED
headlights)

The LED headlight warning light illumi-
nates if the LED headlights malfunction.
Have your vehicle inspected at a SUBARU
dealer as soon as possible.

High beam headlight (models
without LED headlights)

NOTE

If headlight aiming is required, con-

sult your SUBARU dealer for proper
adjustment of the headlight aim.
.

It may be difficult to replace the

bulbs. Have the bulbs replaced by your
SUBARU dealer if necessary.

Perform the following steps to replace the
bulbs.

Left-hand side

1. Left-hand side: Use a screwdriver to
remove the secured clip of the washer
tank. To make it easy to access the bulb,
turn the neck of the washer fluid filler pipe
as illustrated.

Right-hand side

Right-hand side: Use a screwdriver to
undo the clips on the air intake duct, then
remove the air intake duct.

2. Disconnect the electrical connector
from the bulb as pushing the tab.

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Maintenance and service/Replacing bulbs

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Left-hand side

Right-hand side

3. Left-hand side: Remove the bulb from
the headlight assembly by turning it
counterclockwise.
Right-hand side: Remove the bulb from

the headlight assembly by turning it clock-
wise.
4. Replace the bulb with a new one. At
this time, use care not to touch the bulb
surface.
5. To install the bulb to the headlight
assembly, turn it to the reverse direction
until it clicks.
6. Reconnect the electrical connector.
7. Left-hand side: Set the washer fluid
filler pipe to the original place and secure it
by a clip.
Right-hand side: Install the air intake duct
with clips.

Low beam headlight*, front
side marker light, parking
light* and front turn signal
light*

*: models without LED headlights

NOTE

If headlight aiming is required, con-

sult your SUBARU dealer for proper
adjustment of the headlight aim.
.

It may be difficult to replace the

bulbs. Have the bulbs replaced by your
SUBARU dealer if necessary.

1. Start the engine and turn the steering
wheel fully in the opposite direction of the
bulb to be replaced.

2. Stop the engine.

3. Remove the clips from the mud guard.

4. Pull off the mud guard.

Maintenance and service/Replacing bulbs

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Low beam headlight

1. Disconnect the electrical connector
from the bulb as pushing the tab.

2. Remove the bulb from the headlight
assembly by turning it counterclockwise.
3. Replace the bulb with a new one. At
this time, use care not to touch the bulb
surface.
4. To install the bulb to the headlight
assembly, turn it clockwise until it clicks.
5. Reconnect the electrical connector.
6. Reattach the mud guard.

Front side marker light, parking light
and front turn signal light

Front side marker light

Parking light

– CONTINUED –

Maintenance and service/Replacing bulbs

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北米Model "A1720BE-A" EDITED: 2018/ 3/ 9

Front turn signal light

1. Turn the socket counterclockwise and
pull it out.
2. Pull out the bulb from the socket and
replace the bulb with a new one.
3. After replacing the bulb, reattach the
mud guard.

Front turn signal light (mod-
els with LED headlights)

Left-hand side

1. Left-hand side: Use a screwdriver to
remove the secured clip of the washer
tank. To make it easy to access the bulb,

turn the neck of the washer fluid filler pipe
as illustrated.

Right-hand side

Right-hand side: Use a screwdriver to
undo the clips on the air intake duct, then
remove the air intake duct.

Maintenance and service/Replacing bulbs

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