Subaru Solterra (2023 year). Manual in english

467

7-3. Do-it-yourself maintenance

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Heater coolant reservoir (



P.467)

Washer fluid tank (



P.473)

Power control unit coolant reservoir (



P.469)

12-volt battery (



P.470)

Brake fluid reservoir (



P.470)

Fuse box (



P.502)

Radiator (



P.468)

Condenser (



P.468)

Electric cooling fan

The coolant level is satisfactory
if it is between the “MAX” and

“MIN” lines on the reservoir
when the EV system is cold.

Motor compartment

Components

Checking the heater cool-
ant

468

7-3. Do-it-yourself maintenance

Reservoir cap

“MAX” line

“MIN” line

If the level is on or below the “MIN”
line, add coolant up to the “MAX”
line. (



P.548)

■

Coolant selection

Only use “SUBARU Super Coolant”

or a similar high quality ethylene gly-

col based non-silicate, non-amine,

non-nitrite, and nonborate coolant

with long-life hybrid organic acid

technology.
“SUBARU Super Coolant” is a mix-

ture of 50% coolant and 50% deion-

ized water. (Minimum temperature: -

31°F [-35°C])
For more details about coolant, con-

tact your SUBARU dealer.

■

If the coolant level drops within

a short time of replenishing

Visually check the radiator, hoses,

power control unit coolant reservoir

caps, drain cock and water pump.
If you cannot find a leak, have your

SUBARU dealer, test the cap and

check for leaks in the cooling sys-

tem.

Check the radiator and con-
denser and clear away any for-
eign objects.
If either of the above parts is
extremely dirty or you are not
sure of their condition, have
your vehicle inspected SUBARU
dealer.

WARNING

■

When the heater system is

hot

Do not remove the heater coolant

reservoir caps.
The heater system may be under

pressure and may spray hot cool-

ant if the cap is removed, causing

serious injuries, such as burns.

NOTICE

■

When adding coolant

Coolant is neither plain water nor

straight antifreeze. The correct

mixture of water and antifreeze

must be used to provide proper

lubrication, corrosion protection

and cooling. Be sure to read the

antifreeze or coolant label.

■

If you spill coolant

Be sure to wash it off with water to

prevent it from damaging parts or

paint.

Checking the radiator and
condenser

WARNING

■

When the EV system is hot

Do not touch the radiator or con-

denser as they may be hot and

cause serious injuries, such as

burns.

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7-3. Do-it-yourself maintenance

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The coolant level is satisfactory
if it is between the “MAX” and
“MIN” lines on the reservoir
when the EV system is cold.

Reservoir cap

“MAX” line

“MIN” line

If the level is on or below the “MIN”
line, add coolant up to the “MAX”
line.

■

Coolant selection

In order to ensure maximum perfor-

mance of the traction battery cooling

system and limit risks of battery

short-circuit and other damage to

your vehicle, SUBARU recom-

mends using “Genuine Traction Bat-

tery Coolant” or similar high-quality

ethylene glycol-based, low electric

conductivity coolant, non-amine and

non-borate coolant with azole addi-

tives.
SUBARU cannot guarantee that the

use of a product other than “Genu-

ine Traction Battery Coolant” will

prevent risks of battery short-circuit

or other damage.
Never use water as it will cause

damage.
Do not reuse coolant that has been

removed from the radiator.
For more details about coolant, con-

tact your SUBARU dealer.

■

If the coolant level drops within

a short time of replenishing

Visually check the hoses, heater

coolant reservoir caps, drain cock

and water pump.
If you cannot find a leak, have your

SUBARU dealer, test the cap and

check for leaks in the cooling sys-

tem.

WARNING

■

When the electric cooling fan

are operating

Do not touch the motor compart-

ment.
With the power switch in ON, the

electric cooling fan may automati-

cally start to run if the air condi-

tioning is on and/or the coolant

temperature is high. Be sure the

power switch is OFF when work-

ing near the electric cooling fan or

radiator grille.

Checking the power con-
trol unit coolant

WARNING

■

When the EV system is hot

Do not remove the power control

unit coolant reservoir caps.
The cooling system may be under

pressure and may spray hot cool-

ant if the cap is removed, causing

serious injuries, such as burns.

470

7-3. Do-it-yourself maintenance

■

Checking fluid level

The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.

Reservoir cap

“MAX” line

“MIN” line

■

Adding fluid

Make sure to check the fluid
type and prepare the necessary
item.



Fluid type

FMVSS No.116 DOT 3 or SAE

J1703 brake fluid
FMVSS No.116 DOT 4 or SAE
J1704 brake fluid



Item

Clean funnel

■

Brake fluid can absorb moisture

from the air

Excess moisture in the brake fluid

can cause a dangerous loss of brak-

ing efficiency. Use only newly

opened brake fluid.

Check the 12-volt battery as fol-
lows.

■

12-volt battery exterior

Make sure that the 12-volt bat-
tery terminals are not corroded

NOTICE

■

When adding coolant

Coolant is neither plain water nor

straight antifreeze. The correct

mixture of water and antifreeze

must be used to provide proper

lubrication, corrosion protection

and cooling. Be sure to read the

antifreeze or coolant label.

■

If you spill coolant

Be sure to wash it off with water to

prevent it from damaging parts or

paint.

Checking and adding the
brake fluid

WARNING

■

When filling the reservoir

Take care as brake fluid can harm

your hands and eyes and damage

painted surfaces.
If fluid gets on your hands or in

your eyes, flush the affected area

with clean water immediately. If

you still experience discomfort,

see a doctor.

NOTICE

■

If the fluid level is low or high

It is normal for the brake fluid level

to go down slightly as the brake

pads wear out or when the fluid

level in the accumulator is high.
If the reservoir needs frequent

refilling, there may be a serious

problem.

Checking the 12-volt bat-
tery

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7-3. Do-it-yourself maintenance

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and that there are no loose con-
nections, cracks, or loose
clamps.

Terminals

Hold-down clamp

■

Checking 12-volt battery
fluid

Check that the level is between
the “UPPER LEVEL” and
“LOWER LEVEL” lines.

“UPPER LEVEL” line

“LOWER LEVEL” line

If the fluid level is at or below the
“LOWER LEVEL” line, add distilled
water.

■

Adding distilled water

Remove the vent plug.

Add distilled water.

If the “UPPER LEVEL” cannot be

seen, check the fluid level by look-

ing directly at the cell.

Put the vent plug back on
and close it securely.

■

Before recharging

When recharging, the 12-volt bat-

tery produces hydrogen gas which

is flammable and explosive. There-

fore, observe the following precau-

tions before recharging:

●

If recharging with the 12-volt bat-

tery installed on the vehicle, be

sure to disconnect the ground

cable.

●

Make sure the power switch on

the charger is off when connecting

and disconnecting the charger

cables to the 12-volt battery.

■

After recharging/reconnecting

the 12-volt battery

●

The EV system may not start. Fol-

low the procedure below to initial-

ize the system.

Shift the shift position to P.

Open and close any of the doors.

Restart the EV system.

●

Unlocking the doors using the

Smart key system may not be

possible immediately after recon-

necting the 12-volt battery. If this

happens, use the wireless remote

control or the mechanical key to

lock/unlock the doors.

●

Start the EV system with the

power switch in ACC. The EV sys-

tem may not start with the power

switch turned off. However, the EV

system will operate normally from

472

7-3. Do-it-yourself maintenance

the second attempt.

●

The power switch mode is

recorded by the vehicle. If the 12-

volt battery is disconnected and

reconnected, the vehicle will

return the power switch mode to

the status it was in before the 12-

volt battery was disconnected.

Make sure to turn off the power

switch before disconnecting the

12-volt battery. Take extra care

when connecting the 12-volt bat-

tery if the power switch mode prior

to the 12-volt battery being dis-

connected is unknown.

If the EV system will not start even
after multiple attempts at all the
methods above, contact your SUB-
ARU dealer.

WARNING

■

Chemicals in the 12-volt bat-

tery

Batteries contain poisonous and

corrosive sulfuric acid and may

produce hydrogen gas which is

flammable and explosive. To

reduce the risk of death or serious

injury, take the following precau-

tions while working on or near the

12-volt battery:

●

Do not cause sparks by touch-

ing the 12-volt battery terminals

with tools.

●

Do not smoke or light a match

near the 12-volt battery.

●

Avoid contact with eyes, skin

and clothes.

●

Never inhale or swallow electro-

lyte.

●

Wear protective safety glasses

when working near the 12-volt

battery.

●

Keep children away from the

12-volt battery.

■

Where to safely charge the

12-volt battery

Always charge the 12-volt battery

in an open area. Do not charge

the 12-volt battery in a garage or

closed room where there is insuf-

ficient ventilation.

■

Emergency measures regard-

ing electrolyte

●

If electrolyte gets in your eyes

Flush your eyes with clean

water for at least 15 minutes

and get immediate medical

attention. If possible, continue

to apply water with a sponge or

cloth while traveling to the near-

est medical facility.

●

If electrolyte gets on your skin

Wash the affected area thor-

oughly. If you feel pain or burn-

ing, get medical attention

immediately.

●

If electrolyte gets on your

clothes

It can soak through clothing on

to your skin. Immediately take

off the clothing and follow the

procedure above if necessary.

●

If you accidentally swallow elec-

trolyte

Drink a large quantity of water

or milk. Get emergency medical

attention immediately.

■

When there is insufficient 12-

volt battery fluid

Do not use if there is insufficient

fluid in the 12-volt battery. There

is a possible danger that the 12-

volt battery may explode.

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7-3. Do-it-yourself maintenance

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If the warning message appears
on the multi-information display,
the washer tank may be empty.
Add washer fluid.

NOTICE

■

When recharging the 12-volt

battery

Never recharge the 12-volt bat-

tery while the EV system is oper-

ating. Also, be sure all

accessories are turned off.

■

When adding distilled water

Avoid overfilling. Water spilled

during 12-volt battery recharging

may cause corrosion.

Adding the washer fluid

WARNING

■

When adding washer fluid

Do not add washer fluid when the

EV system is hot or operating as

washer fluid contains alcohol and

may catch fire if spilled on the

motor, etc.

NOTICE

■

Do not use any fluid other

than washer fluid

Do not use soapy water or anti-

freeze instead of washer fluid.

Doing so may cause streaking on

the vehicle’s painted surfaces, as

well as damaging the pump lead-

ing to problems of the washer

fluid not spraying.

■

Diluting washer fluid

Dilute washer fluid with water as

necessary.

Refer to the freezing tempera-

tures listed on the label of the

washer fluid bottle.

474

7-3. Do-it-yourself maintenance

Check if the treadwear indica-
tors are showing on the tires.
Also check the tires for uneven
wear, such as excessive wear
on one side of the tread.

New tread

Worn tread

Treadwear indicator

The location of treadwear indicators
is shown by a “TWI” or “

” mark,

etc., molded into the sidewall of
each tire.

Replace the tires if the treadwear
indicators are showing on a tire.

■

When to replace your vehicle’s

tires

Tires should be replaced if:

●

The treadwear indicators are

showing on a tire.

●

You have tire damage such as

cuts, splits, cracks deep enough

to expose the fabric, and bulges

indicating internal damage.

●

A tire goes flat repeatedly or can-

not be properly repaired due to the

size or location of a cut or other

damage.

If you are not sure, consult with your

SUBARU dealer.

■

Tire life

Any tire over 6 years old must be

checked by a qualified technician

even if it has seldom or never been

used or damage is not obvious.

■

Maximum load of tire

Check that the number given by

dividing the maximum load by 1.10

of the replacement tire is greater

than 1/2 of the Gross Axle Weight

Ratings (GAWR) of either the front

axle or the rear axle, whichever is

greater.
For the GAWR, see the Certification

Regulation Label. For the maximum

load of the tire, see the load limit at

maximum cold tire inflation pressure

mentioned on the sidewall of the

tire. (



P.560)

■

Tire types

●

Summer tires

Tires

Replace or rotate tires in
accordance with mainte-
nance schedules and tread-
wear.

Checking tires

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Summer tires are high-speed perfor-
mance tires best suited to highway
driving under dry conditions. Since
summer tires do not have the same
traction performance as snow tires,
summer tires are inadequate for
driving on snow-covered or icy
roads. For driving on snow-covered
roads or icy roads, the use of snow
tires is recommended. When install-
ing snow tires, be sure to replace all
four tires.

●

All season tires

All season tires are designed to pro-
vide better traction in snow and to
be adequate for driving in most win-
ter conditions as well as for use
year-round. All season tires, how-
ever, do not have adequate traction
performance compared with snow
tires in heavy or loose snow. Also,
all season tires fall short in accelera-
tion and handling performance com-
pared with summer tires in highway
driving.

●

Snow tires

For driving on snow-covered roads
or icy roads, we recommend using
snow tires. If you need snow tires,
select tires of the same size, con-
struction and load capacity as the
originally installed tires. Since your
vehicle has radial tires as original
equipment, make sure your snow
tires also have radial construction.
Do not install studded tires without
first checking local regulations for
possible restrictions. Snow tires
should be installed on all wheels.
(



P.396)

■

If the tread on snow tires wears

down below 0.16 in. (4 mm)

The effectiveness of the tires as

snow tires is lost.

WARNING

■

When inspecting or replacing

tires

Observe the following precautions

to prevent accidents.

Failure to do so may cause dam-

age to parts of the drive train as

well as dangerous handling char-

acteristics, which may lead to an

accident resulting in death or seri-

ous injury.

●

Do not mix tires of different

makes, models or tread pat-

terns.

Also, do not mix tires of remark-

ably different treadwear.

●

Do not use tire sizes other than

those recommended by SUB-

ARU.

●

Do not mix differently con-

structed tires (radial, bias-belted

or bias-ply tires).

●

Do not mix summer, all season

and snow tires.

●

Do not use tires that have been

used on another vehicle.

Do not use tires if you do not

know how they were used previ-

ously.

NOTICE

■

Driving on rough roads

Take particular care when driving

on roads with loose surfaces or

potholes.

These conditions may cause

losses in tire inflation pressure,

reducing the cushioning ability of

the tires. In addition, driving on

rough roads may cause damage

to the tires themselves, as well as

the vehicle’s wheels and body.

476

7-3. Do-it-yourself maintenance

Rotate the tires in the order
shown.

To equalize tire wear and extend
tire life, SUBARU recommends that
tire rotation is carried out at the
same interval as tire inspection.
Do not fail to initialize the tire pres-
sure warning system after tire rota-
tion.

Front

■

When rotating the tires

Make sure that the power switch is

OFF. If the tires are rotated while the

power switch is in ON, the tire posi-

tion information will not be updated.

If this accidentally occurs, either turn

the power switch to OFF and then to

ON, or initialize the system after

checking that the tire pressure is

properly adjusted.

Your vehicle is equipped with a
tire pressure warning system
that uses tire pressure warning
valves and transmitters to detect
low tire inflation pressure before
serious problems arise.
The tire pressure warning sys-
tem of this vehicle adopts a 2-
type warning system.



When “Adjust Pressure” is
displayed (Normal Warning)

A warning with the tire pressure
warning light and warning buzzer
when there is an unknown level of
low tire pressure with the appear-
ance of the tire due to natural air
leakage as well as the pressure
lowering due to changes in the
pressure according to the outside
temperature.



When “Immediately Check
Tire when Safe” is displayed
(Emergency Warning)

A warning with the tire pressure
warning light and warning buzzer
when there is a known level of low
tire pressure with the appearance
of the tire due to pressure suddenly
lowering.
However, the system may not be
able to detect sudden tire ruptures
(bursting, etc.).



The tire pressure detected by
the tire pressure warning sys-
tem can be displayed on the
multi-information display.

NOTICE

■

If tire inflation pressure of

each tire becomes low while

driving

Do not continue driving, or your

tires and/or wheels may be

ruined.

Tire rotation

Tire pressure warning
system

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7-3. Do-it-yourself maintenance

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How to change the unit

Park the vehicle in a safe
place and EV system off.

Start the EV system.

Changing the unit cannot be per-

formed while the vehicle is moving.

Press

of the meter

control switch to select

Press

to select

“Vehicle Settings” and then
press and hold “OK”.

Press

of the meter

control switches and the
meter control switches and
select “TPWS setting” and
then press “OK”.

Press

of the meter

control switches and select
“Setting Unit” and then press
“OK”.

Press

of the meter

control switches and select
the desired unit and then
press “OK”.

■

Routine tire inflation pressure

checks

The tire pressure warning system

does not replace routine tire inflation

pressure checks. Make sure to

check tire inflation pressure as part

of your routine of daily vehicle

checks.

■

Tire inflation pressure

●

It may take a few minutes to dis-

play the tire inflation pressure

after the power switch is turned to

ON. It may also take a few min-

utes to display the tire inflation

pressure after inflation pressure

has been adjusted.

●

Tire inflation pressure changes

with temperature.

The displayed values may also be

different from the values mea-

sured using a tire pressure gauge.

■

Situations in which the tire

pressure warning system may

not operate properly

●

In the following cases, the tire

pressure warning system may not

operate properly.

• If non-genuine SUBARU wheels

are used.

• A tire has been replaced with a

tire that is not an OE (Original

Equipment) tire.

• A tire has been replaced with a

tire that is not of the specified size.

• Tire chains etc. are equipped.

• If a window tint that affects the

radio wave signals is installed.

• If there is a lot of snow or ice on

the vehicle, particularly around the

wheels or wheel housings.

• If the tire inflation pressure is

extremely higher than the speci-

fied level.

• If wheels without tire pressure

warning valves and transmitters

are used.

• If the ID code on the tire pressure

warning valves and transmitters is

not registered in the tire pressure

warning computer.

478

7-3. Do-it-yourself maintenance

●

Performance may be affected in

the following situations.

• Near a TV tower, electric power

plant, gas station, radio station,

large display, airport or other facil-

ity that generates strong radio

waves or electrical noise

• When carrying a portable radio,

cellular phone, cordless phone or

other wireless communication

device

If tire position information is not cor-
rectly displayed due to the radio
wave conditions, the display may be
corrected by driving and changing
the radio wave conditions.

●

When the vehicle is parked, the

time taken for the warning to start

or go off could be extended.

●

When tire inflation pressure

declines rapidly for example when

a tire has burst, the warning may

not function.

When replacing tires or wheels,
tire pressure warning valves and
transmitters must also be
installed.

When new tire pressure warning
valves and transmitters are
installed, new ID codes must be
registered in the tire pressure warn-
ing computer and the tire pressure
warning system must be initialized.
(



P.483)

■

When replacing the tires and

wheels

If the ID code of the tire pressure

warning valve and transmitter is not

registered, the tire pressure warning

system will not work properly. After

driving for about 10 minutes, the tire

pressure warning light blinks for 1

minute and stays on to indicate a

system malfunction.

Installing tire pressure
warning valves and trans-
mitters

NOTICE

■

Repairing or replacing tires,

wheels, tire pressure warn-

ing valves, transmitters and

tire valve caps

●

When removing or fitting the

wheels, tires or the tire pressure

warning valves and transmit-

ters, contact your SUBARU

dealer as the tire pressure

warning valves and transmit-

ters may be damaged if not

handled correctly.

●

Make sure to install the tire

valve caps. If the tire valve caps

are not installed, water could

enter the tire pressure warning

valves and the tire pressure

warning valves could be bound.

●

When replacing tire valve caps,

do not use tire valve caps other

than those specified. The cap

may become stuck.

■

To avoid damage to the tire

pressure warning valves and

transmitters

When a tire is repaired with liquid

sealants, the tire pressure warn-

ing valve and transmitter may not

operate properly. If a liquid seal-

ant is used, contact your SUB-

ARU dealer as soon as possible.

After use of liquid sealant, make

sure to replace the tire pressure

warning valve and transmitter

when repairing or replacing the

tire.

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■

When rotating the tires

It is necessary to register the
position of each wheel after per-
forming a tire rotation.
Wheel position registration can
be performed by oneself. Wheel
position registration is per-
formed by driving forward with
moderate left and right turns.
However, depending on the driv-
ing conditions and driving envi-
ronment, registration may take
some time to complete.

■

Registration of the tire posi-
tion

Park the vehicle in a safe
place and stop the EV sys-
tem for 15 minutes or more.

Start the EV system
(



P.469)

Registration cannot be performed

while the vehicle is moving.

Press

of the meter

control switches and select

Press

of the meter

control switches and select
“Vehicle Settings”, and then
press and hold the “OK”.

Press

of the meter

control switches and select

“TPWS Setting”, and then
press “OK”.

Press

of the meter

control switches and select
“Tire Rotation”, and then
press “OK”.

Press

of the meter

control switches and select
“OK”, and then press “OK”.

A message is displayed on the

multi-information display. Also, “--”

is displayed for inflation pressure of

each tire on the multi-information

display while the tire pressure

warning system determines the

position.

“Setting Pressure Wait a
Moment”

Drive at approximately 25
mph (40 km/h) or more for
approximately 10 to 30 min-
utes.

When wheel position registration is

complete, the inflation pressure of

each tire will be displayed on the

multi-information display.
Even if the vehicle is not driven at

approximately 25 mph (40 km/h) or

more, registration can be com-

pleted by driving for a long time.

However, if initialization does not

complete after driving for 1 hour or

Registration of the posi-
tion of each wheel after
performing a tire rotation

480

7-3. Do-it-yourself maintenance

more, park the vehicle in a safe

place for approximately 15 minutes

and then drive the vehicle again.

■

When performing wheel posi-

tion registration

●

Normally, wheel position registra-

tion can be completed within

approximately 30 minutes.

●

Wheel position registration is per-

formed while driving at a vehicle

speed of approximately 25 mph

(40 km/h) or more.

■

The initialization operation

●

If the power switch is turned off

while registering the wheel posi-

tion, the next time the power

switch is turned to ON, the wheel

position registration will resume

and it will not be necessary to

restart the procedure.

●

While the position of each tire is

being determined and the inflation

pressures are not being displayed

on the multi-information display, if

the inflation pressure of a tire

drops, the tire pressure warning

light will come on.

■

If the tire pressure warning sys-

tem is not registered properly

●

In the following situations, wheel

position registration may take lon-

ger than usual to be completed or

may not be possible.

• Vehicle is not driven at approxi-

mately 25 mph (40 km/h) or more

• Vehicle is driven on unpaved

roads

If initialization does not complete
after driving for 1 hour or more, park
the vehicle in a safe place for
approximately 15 minutes and then
drive the vehicle again.

●

If the vehicle is reversed during

wheel position registration, all

data collected until then will be

cleared. Perform driving again.

■

When you need to setting
the tire pressure

In the following situations, it will
be necessary to perform the tire
inflation pressure setting proce-
dure of the tire pressure warning
system.



When the specified tire infla-
tion pressure has changed,
such as due to carried load,
etc.



When the tire inflation pres-
sure is changed such as
when the tire size is changed.

If the tire inflation pressure has
been adjusted to the specified
level, perform the tire inflation
setting procedure by selecting
specified inflation pressure on
the multi-information display.
When the tire inflation pressure
is to be other than specified,
such as when tires other than
the specified size are used, etc.,
set the tire inflation pressure
using the current pressure.
Make sure to adjust the tire
inflation pressure of each tire to
the appropriate level before per-
forming tire pressure setting.
The tire pressure warning sys-
tem operates based on this tire
inflation pressure.

Setting the tire pressure

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7-3. Do-it-yourself maintenance

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■

Setting by selecting a spec-
ified tire inflation pressure

Start the EV system
(



P.231)

The tire inflation pressure cannot

be set while the vehicle is moving.

Press

of the meter

control switches and select

Press

of the meter

control switches and select
“Vehicle Settings”, and then
press and hold the “OK”.

Press

of the meter

control switches and select
“TPWS Setting”, and then
press “OK”.

Press

of the meter

control switches and select
“Tire Pressure Setting”, and
then press “OK”.

Press

of the meter

control switches and select
“Setting by Specified Pres-
sure”, and then press “OK”.

Select the desired front and rear

tire pressures.

Press

of the meter

control switches and select
“OK”, and then press “OK”.

The tire pressure warning light will

slowly blink 3 times and a message

indicating that tire inflation pressure

is being set will be displayed on the

multi-information display.

After setting the tire inflation pres-

sure, a message indicating that set-

ting has been completed will be

displayed on the multi-information

display.

“Setting Pressure Wait a
Moment”

■

Setting using the current
tire inflation pressure

Adjust the tire inflation pres-
sure to the specified cold tire
inflation pressure level.

Make sure to adjust the tire pres-

sure to the specified cold tire infla-

tion pressure level. The tire

pressure warning system will oper-

ate based on this pressure level.

Start the EV system
(



P.231)

The tire inflation pressure cannot

be set while the vehicle is moving.

Press

of the meter

control switches and select

Press

of the meter

control switches and select
“Vehicle Settings”, and then
press and hold the “OK”.

Subaru Solterra (2023 year). Manual in english - page 29