LEXUS NX 300H (2019 year). Instruction

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6-3. Do-it-yourself maintenance

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■

Power control unit coolant reser-
voir

Reservoir cap
“FULL” line
“LOW” line

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

■

Coolant selection

Only use “Toyota Super Long Life Coolant”

or a similar high quality ethylene glycol

based non-silicate, non-amine, non-nitrite,

and non-borate coolant with long-life

hybrid organic acid technology.

U.S.A.:

“Toyota Super Long Life Coolant” is a mix-

ture of 50% coolant and 50% deionized

water.

(Minimum temperature: -31°F [-35°C])

Canada:

“Toyota Super Long Life Coolant” is a mix-

ture of 55% coolant and 45% deionized

water.

(Minimum temperature: -44°F [-42°C])

For more details about coolant, contact

your Lexus dealer.

■

If the coolant level drops within a short

time of replenishing

Visually check the radiator, hoses, engine/

power control unit coolant reservoir caps,

drain cock and water pump.

If you cannot find a leak, have your Lexus

dealer test the cap and check for leaks in

the cooling system.

Check the radiator and condenser and
clear away any foreign objects.
If either of the above parts is extremely
dirty or you are not sure of their condi-
tion, have your vehicle inspected by
your Lexus dealer.

A
B
C

WARNING

■

When the hybrid system is hot

Do not remove the engine/power control

unit coolant reservoir caps.

The cooling system may be under pres-

sure and may spray hot coolant 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 pre-

vent it from damaging parts or paint.

Checking the radiator and con-
denser

WARNING

■

When the hybrid system is hot

Do not touch the radiator or condenser

as they may be hot and cause serious

injuries, such as burns.

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Checking fluid level

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

■

Adding fluid

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

FMVSS No.116 DOT 3 or SAE J1703;
FMVSS No.116 DOT 4 or SAE J1704
brake fluid

 Items

Clean funnel

■

Brake fluid can absorb moisture from

the air

Excess moisture in the brake fluid can cause

a dangerous loss of braking efficiency. Use

only newly opened brake fluid.

If none of the washer do not work or
the “Windshield Washer Fluid Low” on
the multi-information display, the
washer tank may be empty. Add
washer fluid.

WARNING

■

When the electric cooling fans are

operating

Do not touch the engine compartment.

With the power switch in ON mode, the

electric cooling fans may automatically

start to run if the air conditioning is on

and/or the coolant temperature is high.

Be sure the power switch is off when

working near the electric cooling fans or

radiator grille.

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 sur-

faces.

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 and adding the washer
fluid

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6-3. Do-it-yourself maintenance

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The 12-volt battery is located in the left-
hand side of luggage compartment.

■

Before recharging

When recharging, the 12-volt battery pro-

duces hydrogen gas which is flammable

and explosive. Therefore, observe the fol-

lowing precautions before recharging:

●

If recharging with the 12-volt battery

installed on the vehicle, be sure to discon-

nect the ground cable.

●

Make sure the power switch on the char-

ger is off when connecting and discon-

necting the charger cables to the 12-volt

battery.

■

After recharging/reconnecting the 12-

volt battery

●

The hybrid system may not start. Follow

the procedure below to initialize the sys-

tem.

Shift the shift lever to P.

Open and close any of the doors.

Restart the hybrid system.

●

Unlocking the doors using the smart

access system with push-button start may

not be possible immediately after recon-

necting the 12-volt battery. If this hap-

pens, use the wireless remote control or

the mechanical key to lock/unlock the

doors.

●

Start the hybrid system with the power

switch in ACCESSORY mode. The

WARNING

■

When adding washer fluid

Do not add washer fluid when the hybrid

system is hot or operating as washer fluid

contains alcohol and may catch fire if

spilled on the engine etc.

NOTICE

■

Do not use any fluid other than

washer fluid

Do not use soapy water or engine anti-

freeze instead of washer fluid.

Doing so may cause streaking on the

vehicle’s painted surfaces, as well as

damaging the pump leading to problems

of the washer fluid not spraying.

■

Diluting washer fluid

Dilute washer fluid with water as neces-

sary.

Refer to the freezing temperatures listed

on the label of the washer fluid bottle.

12-volt battery

Location

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hybrid system may not start with the

power switch turned off. However, the

hybrid system will operate normally from

the second attempt.

●

The power switch mode is recorded by

the vehicle. If the 12-volt battery is recon-

nected, 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 before

disconnect the 12- volt battery. Take extra

care when connecting the 12-volt battery

if the power switch mode prior to dis-

charge is unknown.

If the system will not start even after multiple

attempts at all methods above, contact your

Lexus dealer.

WARNING

■

Chemicals in the 12-volt battery

The 12-volt battery contains poisonous

and corrosive sulfuric acid and may pro-

duce hydrogen gas which is flammable

and explosive. To reduce the risk of death

or serious injury, take the following pre-

cautions while working on or near the 12-

volt battery:

●

Do not cause sparks by touching 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 electrolyte.

●

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 bat-

tery in a garage or closed room where

there is insufficient ventilation.

■

Emergency measures regarding

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 nearest medical

facility.

●

If electrolyte gets on your skin

Wash the affected area thoroughly. If

you feel pain or burning, 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 nec-

essary.

●

If you accidentally swallow electrolyte

Drink a large quantity of water or milk.

Get emergency medical attention

immediately.

■

When handling the 12-volt battery

P.395

■

When disconnecting the 12-volt bat-

tery

Do not disconnect the negative (-) termi-

nal on the body side as shown. The dis-

connected negative (-) terminal may

touch the positive (+) terminal, which

may cause a short and result in death or

serious injury.

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Lift the deck board and attach the
hook. (

P.283)

Remove the left side deck board.

Remove the cover after removing
the chip.

Press
Pull out

Make sure that the 12-volt battery ter-
minals are not corroded and that there
are no loose connections, cracks, or

loose clamps.

Terminals
Hold-down clamp

Insert the left side auxiliary box.

Push up center position

Insert

Press

NOTICE

■

When recharging the 12-volt battery

Never recharge the 12-volt battery while

the hybrid system is operating. Also, be

sure all accessories are turned off.

Removing the 12-volt battery
maintenance cover

Exterior

A
B

Installing the 12-volt battery
maintenance cover

A
B

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Check if the treadwear indicators are
showing on the tires. Also check the
tires for uneven wear, such as excessive
wear on one side of the tread.
Check the spare tire condition and
pressure if not rotated.

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 indica-
tors 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 cannot be

properly repaired due to the size or loca-

tion of a cut or other damage.

If you are not sure, consult with your Lexus

dealer.

■

Tire life

Any tire over 6 years old must be checked

by a qualified technician even if it has sel-

dom or never been used or damage is not

obvious.

■

Maximum load of tire

Check that the maximum load 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, which-

ever is greater.
For the GAWR, see the Certification 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.412)

■

Tire types

●

Summer tires

Summer tires are high-speed perfor-

mance tires best suited to highway driv-

ing under dry conditions. Since summer

tires do not have the same traction per-

formance 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 installing snow

Tires

Replace or rotate tires in accor-
dance with maintenance schedules
and treadwear.

Checking tires

A
B
C

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6-3. Do-it-yourself maintenance

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tires, be sure to replace all four tires.

●

All season tires

All season tires are designed to provide

better traction in snow and to be ade-

quate for driving in most winter condi-

tions as well as for use year-round. All

season tires, however, do not have ade-

quate 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, construction and load capacity

as the originally installed tires. Since your

vehicle has radial tires as original equip-

ment, 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.256)

■

If the tread on snow tires wears down

below 0.16 in. (4 mm)

The effectiveness of the tires as snow tires is

lost.

Rotate the tires in the order shown.

To equalize tire wear and extend tire life,
Lexus recommends that tire rotation is car-
ried out at the same interval as tire inspec-
tion.
Do not fail to initialize the tire pressure
warning system after tire rotation.

WARNING

■

When inspecting or replacing tires

Observe the following precautions to

prevent accidents.

Failure to do so may cause damage to

parts of the drive train as well as danger-

ous handling characteristics, which may

lead to an accident resulting in death or

serious injury.

●

Do not mix tires of different makes,

models or tread patterns.

Also, do not mix tires of remarkably

different treadwear.

●

Do not use tire sizes other than those

recommended by Lexus.

●

Do not mix differently constructed

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 previously.

●

Do not tow if your vehicle has a com-

pact spare tire installed.

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 cushion-

ing ability of the tires. In addition, driving

on rough roads may cause damage to

the tires themselves, as well as the vehi-

cle’s wheels and body.

■

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

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Front

Your vehicle is equipped with a tire
pressure warning system that uses tire
pressure warning valves and transmit-
ters to detect low tire inflation pressure
before serious problems arise.
 If the tire pressure drops below a

predetermined level, the driver is
warned by a warning light.
(

P.372)

 The tire pressure detected by the

tire pressure warning system can be
displayed on the multi-information
display.

■

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.

■

Situations in which the tire pressure

warning system may not operate prop-

erly

●

In the following cases, the tire pressure

warning system may not operate prop-

erly.

• If non-genuine Lexus 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.

• An auxiliary-supported run-flat tire is

equipped.

• If a window tint that affects the radio wave

signals is installed.

• If there is a lot of snow or ice on the vehi-

cle, particularly around the wheels or

wheel housings.

• If the tire inflation pressure is extremely

higher than the specified level.

• If wheel without the tire pressure warning

valve and transmitter is used.

• If the ID code on the tire pressure warn-

ing valves and transmitters is not regis-

tered in the tire pressure warning

computer.

●

Performance may be affected in the fol-

lowing situations.

• Near a TV tower, electric power plant,

gas station, radio station, large display,

airport or other facility that generates

strong radio waves or electrical noise

• When carrying a portable radio, cellular

phone, cordless phone or other wireless

communication device

●

When the vehicle is parked, the time

taken for the warning to start or go off

could be extended.

●

When tire inflation pressure declines rap-

idly for example when a tire has burst, the

warning may not function.

Tire pressure warning system

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When replacing tires or wheels, tire
pressure warning valves and transmit-
ters must also be installed.
When new tire pressure warning
valves and transmitters are installed,
new ID codes must be registered in the
tire pressure warning computer and
the tire pressure warning system must
be initialized. Have tire pressure warn-
ing valve and transmitter ID codes reg-
istered by your Lexus dealer.

(

P.344)

■

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 20 min-

utes, the tire pressure warning light blinks

for 1 minute and stays on to indicate a sys-

tem malfunction.

WARNING

■

Caution regarding interference with

electronic devices

●

People with implantable cardiac pace-

makers, cardiac resynchronization

therapy-pacemakers or implantable

cardioverter defibrillators should not

come within 17.7 in. (450 mm) of the

tire pressure warning system initiators.

The radio waves may affect the opera-

tion of such devices.

●

Users of any electrical medical device

other than implantable cardiac pace-

makers, cardiac resynchronization

therapy-pacemakers or implantable

cardioverter defibrillators should con-

sult the manufacturer of the device for

information about its operation under

the influence of radio waves.

Radio waves could have unexpected

effects on the operation of such medi-

cal devices.

Installing tire pressure warning
valves and transmitters

NOTICE

■

Repairing or replacing tires, wheels,

tire pressure warning valves, trans-

mitters and tire valve caps

●

When removing or fitting the wheels,

tires or the tire pressure warning

valves and transmitters, contact your

Lexus dealer as the tire pressure warn-

ing valves and transmitters 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 seal-

ants, the tire pressure warning valve and

transmitter may not operate properly. If a

liquid sealant is used, contact your Lexus

dealer or other qualified service shop as

soon as possible. After use of liquid seal-

ant, make sure to replace the tire pres-

sure warning valve and transmitter when

repairing or replacing the tire. (

P.339,

347)

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The tire pressure warning system
must be initialized in the following
circumstances:

 When adjusting the tire inflation

pressure.

 When the tire inflation pressure is

changed such as when changing
traveling speed.

 When rotating the tires.
 When changing the tire.
When the tire pressure warning system
is initialized, the current tire inflation
pressure is set as the benchmark pres-
sure.

■

How to initialize the tire pressure
warning system

Park the vehicle in a safe place and
turn the power switch off.

Initialization cannot be performed while

the vehicle is moving.

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

Make sure to adjust the tire pressure to the

specified cold tire inflation pressure level.

The tire pressure warning system will oper-

ate based on this pressure level.

Turn the power switch to ON
mode.

Press

of the meter con-

trol switches and select

Press

of the meter con-

trol switches, select the “Vehicle
Settings” and then press

Press

of the meter con-

trol switches, select the “TPMS”
and then press and hold the

The “Tire Pressure Recalibrating. Please

Wait Until Complete” will be displayed on

the multi-information display and the tire

pressure warning light will blink slowly 3

times.

When the message disappears, initializa-

tion is complete.

■

Initializing the tire pressure warning sys-

tem

Initialize the system with the tire inflation

pressure adjusted to the specified level.

■

The initialization operation

●

Make sure to carry out initialization after

adjusting the tire inflation pressure.

Also, make sure the tires are cold before

carrying out initialization or tire inflation

pressure adjustment.

●

If you have accidentally turned the power

switch off during initialization, it is not

necessary to press the reset switch again

as initialization will restart automatically

when the power switch has been turned

to ON mode for the next time.

●

If you accidentally press the reset switch

when initialization is not necessary, adjust

Initializing the tire pressure
warning system

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the tire inflation pressure to the specified

level when the tires are cold, and conduct

initialization again.

■

Warning performance of the tire pres-

sure warning system

The warning of the tire pressure warning

system will change in accordance with the

conditions under which it was initialized. For

this reason, the system may give a warning

even if the tire pressure does not reach a

low enough level, or if the pressure is higher

than the pressure that was adjusted to when

the system was initialized.

■

When initialization of the tire pressure

warning system has failed

Initialization can be completed in a few min-

utes. However, in the following cases, the

settings have not been recorded and the

system will not operate properly. If repeated

attempts to record tire inflation pressure

settings are unsuccessful, have the vehicle

inspected by your Lexus dealer.

●

When initializing the tire pressure warn-

ing system, the tire pressure warning light

does not blink 3 times.

●

After carrying out the initialization proce-

dure, the tire pressure warning light

blinks for 1 minute then stays on after

driving for 20 minutes.

The tire pressure warning valve and
transmitter is equipped with a unique
ID code. When replacing a tire pres-
sure warning valve and transmitter, it is

necessary to register the ID code.
Have the ID code registered by your
Lexus dealer.

WARNING

■

When initializing the tire pressure

warning system

Do not initializing tire inflation pressure

without first adjusting the tire inflation

pressure to the specified level. Other-

wise, the tire pressure warning light may

not come on even if the tire inflation pres-

sure is low, or it may come on when the

tire inflation pressure is actually normal.

Registering ID codes

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The recommended cold tire inflation
pressure and tire size are displayed on
the tire and loading information label.
(

P.408)

Tire valve
Tire pressure gauge

Remove the tire valve cap.

Press the tip of the tire pressure
gauge onto the tire valve.

Read the pressure using the gauge
gradations.

If the tire inflation pressure is not at
the recommended level, adjust the
pressure.
If you add too much air, press the
center of the valve to deflate.

After completing the tire inflation
pressure measurement and adjust-
ment, apply soapy water to the
valve and check for leakage.

Put the tire valve cap back on.

■

Tire inflation pressure check interval

You should check tire inflation pressure

every two weeks, or at least once a month.

Do not forget to check the spare.

■

Effects of incorrect tire inflation pres-

sure

Driving with incorrect tire inflation pressure

may result in the following:

●

Reduced fuel economy

●

Reduced driving comfort and poor han-

dling

●

Reduced tire life due to wear

●

Reduced safety

●

Damage to the drive train

If a tire needs frequent inflating, have it

checked by your Lexus dealer.

■

Instructions for checking tire inflation

pressure

When checking tire inflation pressure,

observe the following:

●

Check only when the tires are cold.

If your vehicle has been parked for at

least 3 hours or has not been driven for

more than 1 mile or 1.5 km, you will get an

accurate cold tire inflation pressure read-

Tire inflation pressure

Checking the specified tire infla-
tion pressure

Inspection and adjustment pro-
cedure

A
B

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ing.

●

Always use a tire pressure gauge.

It is difficult to judge if a tire is properly

inflated based only on its appearance.

●

It is normal for the tire inflation pressure

to be higher after driving as heat is gen-

erated in the tire. Do not reduce tire infla-

tion pressure after driving.

●

Never exceed the vehicle capacity

weight.

Passengers and luggage weight should

be placed so that the vehicle is balanced.

When replacing wheels, care should
be taken to ensure that they are equiv-
alent to those removed in load capac-
ity, diameter, rim width and inset

Replacement wheels are available at
your Lexus dealer.

: Conventionally referred to as offset.

Lexus does not recommend using the
following:
 Wheels of different sizes or types
 Used wheels
 Bent wheels that have been straight-

ened

■

When replacing wheels

The wheels of your vehicle are equipped

with tire pressure warning valves and trans-

mitters that allow the tire pressure warning

system to provide advance warning in the

event of a loss in tire inflation pressure.

Whenever wheels are replaced, tire pres-

sure warning valves and transmitters must

be installed. (

P.339, 347)

WARNING

■

Proper inflation is critical to save tire

performance

Keep your tires properly inflated.

If the tires are not properly inflated, the

following conditions may occur which

could lead to an accident resulting in

death or serious injury:

●

Excessive wear

●

Uneven wear

●

Poor handling

●

Possibility of blowouts resulting from

overheated tires

●

Air leaking from between tire and

wheel

●

Wheel deformation and/or tire dam-

age

●

Greater possibility of tire damage

while driving (due to road hazards,

expansion joints, sharp edges in the

road, etc.)

NOTICE

■

When inspecting and adjusting tire

inflation pressure

Be sure to put the tire valve caps back on.

If a valve cap is not installed, dirt or mois-

ture may get into the valve and cause an

air leak, resulting in decreased tire infla-

tion pressure.

Wheels

If a wheel is bent, cracked or heavily
corroded, it should be replaced.
Otherwise, the tire may separate
from the wheel or cause a loss of
handling control.

Wheel selection

WARNING

■

When replacing wheels

●

Do not use wheels that are a different

size from those recommended in the

Owner’s Manual, as this may result in a

loss of handling control.

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 Use only Lexus wheel nuts and

wrenches designed for use with
your aluminum wheels.

 When rotating, repairing or chang-

ing your tires, check that the wheel
nuts are still tight after driving 1000
miles (1600 km).

 Be careful not to damage the alumi-

num wheels when using tire chains.

 Use only Lexus genuine balance

weights or equivalent and a plastic
or rubber hammer when balancing

your wheels.

WARNING

●

Never use an inner tube in a leaking

wheel which is designed for a tubeless

tire. Doing so may result in an acci-

dent, causing death or serious injury.

■

Use of defective wheels prohibited

Do not use cracked or deformed wheels.

Doing so could cause the tire to leak air

during driving, possibly causing an acci-

dent.

NOTICE

■

Replacing tire pressure warning

valves and transmitters

●

Because tire repair or replacement

may affect the tire pressure warning

valves and transmitters, make sure to

have tires serviced by your Lexus

dealer or other qualified service shop.

In addition, make sure to purchase

your tire pressure warning valves and

transmitters at your Lexus dealer.

●

Ensure that only genuine Lexus wheels

are used on your vehicle.

Tire pressure warning valves and trans-

mitters may not work properly with

non-genuine wheels.

Aluminum wheel precautions

LEXUS NX 300H (2019 year). Instruction - part 21