Lexus NX450H+ (2024 year). Manual in english

Inspection of consumables

Do-it-yourself service precautions

If you perform maintenance by yourself, be sure to follow the correct procedure as
given in the section for each part.

WARNING

The engine compartment contains many mechanisms and fluids that may move suddenly,
become hot, or become electrically charged. Observe the following precautions.

■

When working on the engine compartment

●

Make sure that the "IGNITION ON" on the multi-information display and the
"READY" indicator are both off.

●

Keep hands, clothing and tools away from the moving fan and engine drive belt.

●

Be careful not to touch the engine, power control unit, radiator, exhaust manifold, etc.,
right after driving as they may be hot. Oil and other fluids may also be hot.

●

Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment.

●

Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes are flamma-
ble.

■

When working near the electric cooling fan or radiator grille

Be sure the power switch is OFF.
With the power switch in ON, the electric cooling fan may automatically start to run if the
air conditioning is on or the coolant temperature is high.

■

Safety glasses

Wear safety glasses to prevent flying or falling material, fluid spray, etc., from getting in
your eyes.

NOTICE

■

If you remove the air cleaner filter

Driving with the air cleaner filter removed may cause excessive engine wear due to dirt in
the air.

Maintenance

Items which require maintenance and the necessary parts and tools to perform
maintenance on those items are as follows:

■

12-volt battery condition

●

Grease

●

Conventional wrench (for terminal clamp bolts)

8-4. Inspection of consumables

599

Maintenance and car

■

Brake fluid level

●

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

●

Rag or paper towel

●

Funnel (used only for adding brake fluid)

■

Engine/power control unit coolant level

●

"Toyota Super Long Life Coolant" or a similar high quality ethylene glycol-based
non-silicate, non-amine, nonnitrite and non-borate coolant with long-life hybrid
organic acid technology
For the U.S.A.: "Toyota Super Long Life Coolant" is pre-mixed with 50% coolant
and 50% deionized water.
For Canada: "Toyota Super Long Life Coolant" is pre-mixed with 55% coolant
and 45% deionized water.

●

Funnel (used only for adding coolant)

■

Engine oil level

●

"Toyota Genuine Motor Oil" or equivalent

●

Rag or paper towel

●

Funnel (used only for adding engine oil)

■

Fuses

Fuse with same amperage rating as original

■

Light bulbs

Bulb with same number and wattage rating as original

■

Headlight aim

Phillips-head screwdriver

■

Radiator and condenser

■

Tire inflation pressure

●

Tire pressure gauge

●

Compressed air source

■

Washer fluid

●

Water or washer fluid containing antifreeze (for winter use)

●

Funnel (used only for adding water or washer fluid)

8-4. Inspection of consumables

600

Opening the hood

Pull the hood lock release lever.

The hood will pop up slightly.

Push the auxiliary catch lever to the left and
lift the hood.

INFORMATION

■

Closing the hood

When closing the hood, make sure to release it from a slightly high position (approxi-
mately 7.9 in. [20 cm]) to close it.
If the hood is pushed by hand to close it, it may not lock on both sides.

WARNING

■

Pre-driving check

Check that the hood is fully closed and locked.
If the hood is not locked properly, the hood may suddenly open while driving.

8-4. Inspection of consumables

601

Maintenance and car

Engine compartment

Engine compartment components

Fuse boxes

→

P.751

Engine oil filler cap

→

P.605

Engine oil level dipstick

→

P.603

Brake fluid reservoir

Radiator

Electric cooling fan

Washer fluid tank

Power control unit coolant reservoir

→

P.606

Engine coolant reservoir

→

P.605

Checking and adding the engine oil

INFORMATION

■

Engine oil consumption

A certain amount of engine oil will be consumed while driving. In the following situations,
oil consumption may increase, and engine oil may need to be added in between oil
maintenance intervals.

8-4. Inspection of consumables

602

●

When the engine is new, for example directly after purchasing the vehicle or after
replacing the engine

●

If low quality oil or oil of an inappropriate viscosity is used

●

When driving at high engine speeds or with a heavy load, when towing (vehicles with
towing package only), or when driving while accelerating or decelerating frequently

●

When leaving the engine idling for a long time, or when driving frequently through
heavy traffic

WARNING

●

Used engine oil contains potentially harmful contaminants which may cause skin
disorders such as inflammation and skin cancer, so care should be taken to avoid
prolonged and repeated contact. To remove used engine oil from your skin, wash
thoroughly with soap and water.

●

Dispose of used oil and filters only in a safe and acceptable manner. Do not dispose
of used oil and filters in household trash, in sewers or onto the ground. Call your
Lexus dealer, service station or auto parts store for information concerning recycling
or disposal.

●

Do not leave used engine oil within the reach of children.

NOTICE

■

When replacing the engine oil

When replacing the engine oil, observe the following precautions.

●

Be careful not to spill engine oil on the vehicle components.

●

Avoid overfilling, or the engine could be damaged.

●

Check the oil level on the dipstick every time you refill the vehicle.

●

Be sure the engine oil filler cap is properly tightened.

■

If oil is spilled on the engine cover

To prevent the engine cover from being damaged, remove any engine oil from the engine
cover as soon as possible using a neutral detergent. Do not use an organic solvent such
as brake cleaner.

Checking the engine oil

With the engine at operating temperature and turned off, check the oil level on the
dipstick.

8-4. Inspection of consumables

603

Maintenance and car

NOTICE

To prevent serious engine damage, check the oil level on a regular basis.

Park the vehicle on level ground. After warming up the engine and turning off
the hybrid system, wait more than 5 minutes for the oil to drain back into the
bottom of the engine.

Holding a rag under the end, pull the dipstick
out.

Wipe the dipstick clean.

Reinsert the dipstick fully.

Holding a rag under the end, pull the dipstick out and check the oil level.

Low

Normal

Excessive

The shape of the dipstick may differ depending on
the type of vehicle or engine.

Wipe the dipstick and reinsert it fully.

Checking the oil type and preparing the items needed

Make sure to check the oil type and prepare the items needed before adding oil.

●

Engine oil selection

●

Oil quantity (Low

→

Full)

1.6 qt. (1.5 L, 1.3 Imp.qt.)

●

Items
Clean funnel

Related Links

Lubrication system(P. 763)

8-4. Inspection of consumables

604

Adding engine oil

If the oil level is below or near the low level mark, add engine oil of the same type as
that already in the engine.

Remove the oil filler cap by turning it counterclockwise.

Add engine oil slowly, checking the dipstick.

Install the oil filler cap by turning it clockwise.

Checking the coolant

The coolant level is satisfactory if it is between the [FULL] and [LOW] lines on the
reservoir when the hybrid system is cold.

■

Engine coolant reservoir

Reservoir cap

[FULL] line

[LOW] line

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

■

Power control unit coolant reservoir

Reservoir cap

[FULL] line

[LOW] line

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

8-4. Inspection of consumables

605

Maintenance and car

INFORMATION

■

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 mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: -31°F [-35°C])
Canada: "Toyota Super Long Life Coolant" is a mixture 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.

WARNING

When the hybrid system is hot, do not remove the engine coolant reservoir cap or power
control unit coolant reservoir cap.
The cooling system may be under pressure 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 prevent it from damaging parts or paint.

Checking the radiator and condenser

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 condition,
have your vehicle inspected by your Lexus dealer.

8-4. Inspection of consumables

606

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.

■

When the electric cooling fan are operating

Do not touch the engine compartment. With the power switch in ON, the electric cooling
fan may automatically start to run if the air conditioning is on or the coolant temperature
is high. Be sure the power switch is OFF when working near the electric cooling fan or
radiator grille.

Checking the brake fluid

The brake fluid level should be between the
[MAX] and [MIN] lines on the tank.

Adding the brake fluid

Slide and lift up the rubber strip to partly
remove it as shown.

Disconnect the claws and remove the service
cover.

8-4. Inspection of consumables

607

Maintenance and car

Remove the reservoir cap.

Add brake fluid slowly while checking the fluid level.

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

●

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

●

Items
Clean funnel

WARNING

Take care when filling the reservoir, as brake fluid can harm your hands and eyes and
damage painted surfaces.
If brake fluid gets on your hands or in your eyes, flush the affected area with clean
water immediately.
If you experience discomfort, see a doctor.

NOTICE

It is normal for the brake fluid level to go down slightly as the brake pads wear or
when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, there may be a serious problem.

INFORMATION

■

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.

8-4. Inspection of consumables

608

Adding washer fluid

If washer fluid does not spray from any of the
washers or "Windshield Washer Fluid Low" is
displayed on the multi-information display, the
washer fluid bottle may be empty. Add washer
fluid.

WARNING

Do not add washer fluid when the hybrid system is hot or operating.
As washer fluid contains alcohol, it 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 antifreeze 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 necessary. Refer to the freezing temperatures listed on
the label of the washer fluid bottle.

8-4. Inspection of consumables

609

Maintenance and car

12-volt battery

12-volt battery location

WARNING

■

Chemicals in the 12-volt battery

The 12-volt battery contains poisonous and corrosive sulfuric acid and may produce
hydrogen gas which is flammable and explosive.
Observe the following precautions 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 battery 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 may soak through your clothing on to your skin.
Immediately take off the clothing and follow the procedure above if necessary.

●

If you accidentally swallow electrolyte, drink a large quantity of water or milk and get
emergency medical attention immediately.

■

When disconnecting the 12-volt battery

Never disconnect the negative (-) terminal. The disconnected body ground terminal may
touch the positive (+) terminal, which may cause a short, resulting in death or serious
injury.

8-4. Inspection of consumables

610

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

Removing the 12-volt battery cover

Open the deck board.

Remove the 12-volt battery cover.

Checking the 12-volt battery

■

12-volt battery exterior

Make sure that the 12-volt battery terminals are not corroded and that there are no
loose connections, cracks, or loose clamps.

Terminals

Hold-down clamp

Before recharging

When recharging, the 12-volt battery produces hydrogen gas which is flammable
and explosive. Therefore, observe the following 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 charger is off when connecting and discon-
necting the charger cables to the 12-volt battery.

8-4. Inspection of consumables

611

Maintenance and car

NOTICE

When recharging the 12-volt battery, make sure that the hybrid system is operating and
all accessories are off.

After recharging or reconnecting the 12-volt battery

The hybrid system may not start. Follow the procedure below to initialize the
system.

Change the shift position to P.

Open and close any of the doors.

Restart the hybrid system.

INFORMATION

●

Unlocking the doors using the smart access system with push-button start may not
be possible immediately after reconnecting the 12-volt battery. If this happens, use
the wireless remote control or the mechanical key to lock/unlock the doors.

●

Start the hybrid system with the power switch in ACC. The 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
disconnected and reconnected, the vehicle will return the power switch to the
mode it was in before the 12-volt battery was disconnected. Make sure to turn the
power switch off before disconnecting the 12-volt battery. Take extra care when
connecting the 12-volt battery if the power switch mode prior to the 12-volt battery
being disconnected is unknown.
If the hybrid system does not start even after multiple attempts at all methods
above, contact your Lexus dealer.

8-4. Inspection of consumables

612

Air conditioning filter maintenance

The air conditioning filter must be changed regularly to maintain air conditioning
efficiency.

Checking interval

Inspect and replace the air conditioning filter according to the maintenance sched-
ule. In dusty areas or areas with heavy traffic flow, early replacement may be
required.

●

If air flow from the vents decreases dramatically, the air conditioning filter may
be clogged. Check the filter and replace it if necessary.
(For scheduled maintenance information, please refer to the "Owner’s Manual
Supplement" or "Scheduled Maintenance".)

●

If air fresheners, etc. are used inside the vehicle, the service life of the deo-
dorizing function of the air conditioning filter with deodorizing function may
be reduced significantly. If odors from the air conditioning system become a
concern, replace the filter.

Replacing the air conditioning filter

NOTICE

Observe the following precautions when using the air conditioning system.
Make sure that a filter is always installed. Using the air conditioning system without a filter
may cause damage to the system.

Turn the power switch off.

Open the glove box and disconnect the
damper stay from the pin.

8-4. Inspection of consumables

613

Maintenance and car

Push both the sides of the glove box inward
and disengage each claw on the upper side.
Then, pull the glove box to disengage the
claws on the lower side and remove the glove
box.

Unlock the filter cover ( ), pull the filter
cover out of the claws ( ), and remove the
filter cover.

Remove the filter case.

Remove the air conditioning filter from the
filter case and replace it with a new one.

The [

UP] marks shown on the filter should be

pointing up.

8-4. Inspection of consumables

614

Tire maintenance

Replace or rotate tires in accordance with maintenance schedules and treadwear.

NOTICE

Take particular care when driving on uneven rough roads with cracks and potholes.
These conditions may cause loss of tire inflation pressure, reducing the cushioning ability
of the tires. Driving on rough roads may also cause damage to the tires themselves, as
well as the vehicle’s wheels and body.

8-5. Tire maintenance

615

Maintenance and car

Tire inspection items

WARNING

■

When inspecting or replacing the tires

Observe the following precautions.
Failure to do so may lead to damage to the drivetrain or unstable handling.

●

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.

NOTICE

If tire inflation pressure becomes low while driving, do not continue driving. Otherwise
the tire or wheel may be damaged.

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 indicators
are showing on a tire.

8-5. Tire maintenance

616

INFORMATION

■

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 location 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 seldom
or never been used or damage is not obvious.

■

Maximum load of tire

Check that the number given by dividing the maxi-
mum 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 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.

■

Tire types

●

Summer tires
Summer tires are high-speed performance 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 installing snow 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 adequate
for driving in most winter conditions as well as for use year-round. All season tires,
however, do not have adequate traction performance compared with snow tires in
heavy or loose snow. Also, all season tires fall short in acceleration and handling
performance compared with summer tires in highway driving.

●

Snow tires

8-5. Tire maintenance

617

Maintenance and car

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 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.

■

If the tread on snow tires wears down below 0.16 in. (4 mm)

The effectiveness of the tires as snow tires is lost.

8-5. Tire maintenance

618

Run-flat tire features

When run-flat tires are installed, the vehicle can be driven for a maximum of
50 miles (80 km) at a speed below 50 mph (80 km/h) after any tire goes
flat. (However, the vehicle speed may not increase to near 50 mph [80 km/h]
depending on weather or driving conditions.)
Make sure to replace the flat tire before the vehicle has been driven for near 50
miles (80 km). Also, do not use a repaired tire.

A run-flat tire has a

mark on the side wall.

INFORMATION

■

Precautions for run-flat tires

●

The run-flat tires are for only this vehicle. Do not use the tires on other vehicles.

●

Do not mix run-flat tires and normal tires.

●

If non-genuine Lexus wheels are used, it may be impossible to sufficiently demonstrate
the performance of run-flat tires.

8-5. Tire maintenance

619

Maintenance and car

Operation of the tire pressure warning system

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 system of this vehicle adopts a 2-type warning system.

▶

Multi-information display (vehicles without a head-up display)

▶

Multi-information display (vehicles with a head-up display)

▶

Center display

●

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 appearance 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.

8-5. Tire maintenance

620

●

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 system can be displayed
on the center display.

INFORMATION

■

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 display the tire inflation pressure after the power switch is
turned to ON.
It may also take a few minutes 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 measured 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 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.

•

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 specified level.

•

If tires not equipped with 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.

●

Performance may be affected in the following situations.

8-5. Tire maintenance

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Maintenance and car

•

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.

If tire position information is not correctly displayed due to the radio wave conditions,
the display may be corrected by changing the location of the vehicle as the radio wave
conditions may change.

●

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 operate.

Installing tire pressure warning valves and transmitters

NOTICE

■

Repairing or replacing tires, wheels, tire pressure warning valves, transmitters 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 warning valves and trans-
mitters 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, corrode the valve, and cause sticking and
air leaks.

●

When replacing tire valve caps, do not use tire valve caps other than those specified.
The cap may become stuck.

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 warning computer

INFORMATION

■

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.

8-5. Tire maintenance

622

In this case, after driving for about 20 minutes, the tire pressure warning light blinks for 1
minute and stays on to indicate a system malfunction.

Registration of the position of each wheel after performing a tire rota-
tion

It is necessary to register the position of each wheel after performing a tire
rotation.
Wheel position registration can be performed by oneself. Wheel position registra-
tion is performed by driving forward with moderate left and right turns. However,
depending on the driving conditions and driving environment, registration may
take some time to complete.

Park the vehicle in a safe place, turn the power switch off and wait 15 minutes or
more.

Start the hybrid system.

The wheel position registration procedure cannot be performed while the vehicle is
moving.

Select

on the center display.

Select [Vehicle customize].

Select [Tire pressure].

Select [Tire rotation].

Select [Continue].

A message indicating that wheel position registration is being performed will be
displayed on the multi-information display. "---" will be displayed for the tire inflation
pressure of each tire and wheel position registration will begin.

Drive straight (with occasional left and right turns) at approximately 25 mph
(40 km/h) or more for approximately 10 to 30 minutes.

When wheel position registration is complete, a message indicating that registration
has been completed and the inflation pressure of each tire will be displayed on the
multi-information display.
Even if it is not possible to drive continuously at approximately 25 mph (40 km/h) or
more, registration can be completed by driving for a long time. However, if registration
does not complete after driving for 1 hour or more, park the vehicle in a safe place and
leave it with the power switch in ON for approximately 15 minutes or more, and then
perform the driving procedure again.

8-5. Tire maintenance

623

Maintenance and car

INFORMATION

■

When performing wheel position registration

●

Normally, wheel position registration can be completed within approximately 30
minutes.

●

Wheel position registration is performed while driving at a vehicle speed of
approximately 25 mph (40 km/h) or more.

■

Wheel position registration procedure

●

If the power switch is turned off while registering the wheel position, 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 wheel is being determined and the inflation pressures
are not being displayed, if the inflation pressure of a tire drops, the tire pressure
warning light will come on.

■

If the wheel position cannot be registered easily

●

In the following situations, wheel position registration may take longer than usual
to be completed or may not be possible.

•

Vehicle is not driven at approximately 25 mph (40 km/h) or more

•

Vehicle is driven on unpaved roads

•

If wheel position registration 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.

Setting the tire pressure

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

●

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

●

When the tire inflation pressure 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 center
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

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to the appropriate level before performing tire pressure setting. The tire pressure
warning system operates based on this tire inflation pressure.

Setting by selecting a specified tire inflation pressure

Start the hybrid system.

The tire inflation pressure cannot be set while the vehicle is moving.

Select

on the center display.

Select [Vehicle customize].

Select [Tire pressure].

Select [Set indicated air pressure] and then select the desired front and rear
tire pressures.

Select [OK].

The tire pressure warning light will slowly blink 3
times.
After setting the tire inflation pressure, a message
indicating that setting has been completed will be
displayed on the multi-information display.

INFORMATION

■

If the tire inflation pressure cannot be set easily

●

If the tire pressure warning light does not blink 3 times when starting the tire
inflation pressure setting procedure, the procedure may not have started. Perform
the procedure again from the beginning.

●

If tire inflation pressure setting procedure cannot be completed after performing
the above procedure, contact your Lexus dealer.

Setting using the current tire inflation pressure

WARNING

Make sure to adjust the tire inflation pressure of each tire to the appropriate level before
performing tire pressure setting. Otherwise, the tire pressure warning light may not
illuminate even if the tire inflation pressure drops or may illuminate even though the tire
inflation pressure is normal.

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Maintenance and car

INFORMATION

■

Warning performance of the tire pressure warning system

●

When performing the tire pressure setting using the current tire inflation pressure,
the warning timing of the tire pressure warning system will vary according to the
conditions under which tire pressure setting was performed. Therefore, a warning may
be output even if the tire inflation pressure drops slightly or if the tire inflation pressure
increases above that when the tire inflation pressure was set.

●

Make sure to perform the tire pressure setting procedure after adjusting the tire
inflation pressure. Also, make sure the tires are cold before performing the tire
pressure setting procedure or adjusting the tire inflation pressure.

Adjust the tire inflation pressure of each tire to the appropriate level.

Make sure to adjust the tire inflation pressure with the tires cold.

Start the hybrid system.

The tire inflation pressure cannot be set while the vehicle is moving.

Select

on the center display.

Select [Vehicle customize].

Select [Tire pressure].

Select [Set current air pressure].

Select [Continue].

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 mul-
ti-information display.
After setting the tire inflation pressure, a message
indicating that setting has been completed will be
displayed on the multi-information display.

INFORMATION

■

Tire inflation pressure setting procedure

●

If the power switch is turned off while setting the tire inflation pressure, the next
time the power switch is turned to ON, the setting procedure will resume and it
will not be necessary to restart the procedure.

●

If the tire inflation pressure setting procedure is started unnecessarily, adjust the
tire inflation pressure to the specified level with the tires cold and then perform
setting by selecting a specified tire inflation pressure, or perform the tire inflation
pressure setting procedure with the current tire inflation pressure.

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■

If the tire inflation pressure cannot be set easily

●

Normally, the tire inflation pressure setting procedure can be completed in 2 or 3
minutes.

●

If tire inflation pressure setting procedure cannot be completed after performing
the above procedure, contact your Lexus dealer.

Registering ID codes

The tire pressure warning valve and transmitter is equipped with a unique ID code.
When new tire pressure warning valves and transmitters are installed, new ID
codes must be registered in the tire pressure warning computer.

INFORMATION

●

ID codes can be registered by yourself, but depending on the driving conditions and
driving environment, registration may take some time to complete.

●

When using a wheel set which all of the ID codes have already been registered, the
wheel set can be changed in a short amount of time.

Before performing ID code registration, make sure that no wheels with tire pres-
sure warning valve and transmitters installed are near the vehicle.

Park the vehicle in a safe place, turn the power switch off and wait 15 minutes or
more.

Start the hybrid system.

The ID code registration procedure cannot be performed while the vehicle is moving.

Select

on the center display.

Select [Vehicle customize].

Select [Tire pressure].

Check if the desired wheel set ([Set 1] or [Set
2]) is displayed.

ID codes will be registered to the displayed wheel
set.
To change the wheel set to be registered, select
the displayed set, and then select the wheel set
you wish to register.

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Maintenance and car

If ID codes have already been registered for that wheel set, the tire pressure warning
light will slowly blink 3 times, and a message indicating that change is occurring will be
displayed on the multi-information display.

Select [New tire registration].

Select [Continue].

The tire pressure warning light will slowly blink 3
times and a message indicating that ID code reg-
istration is being performed will be displayed on
the multi-information display. Wheel set changing
will be canceled and registration will begin.
When registration is being performed, the tire
pressure warning light will blink for approximately
1 minute then illuminate and "---" will be displayed for the inflation pressure of each tire
on the multi-information display.

INFORMATION

If the tire pressure warning light does not blink 3 times when starting ID code
registration procedure, the procedure may not have started. Perform the procedure
again from the beginning.

Drive straight (with occasional left and right turns) at approximately 25 mph
(40 km/h) or more for approximately 10 to 30 minutes.

When registration is complete, the tire pressure warning light will turn off and a
message indicating that registration has been completed will be displayed on the
multi-information display.
Registration may take longer than normal to complete if the vehicle speed cannot be
maintained at approximately 25 mph (40 km/h) or more. If registration cannot be
completed after driving for 1 hour or more, perform the registration procedure again
from the beginning.

INFORMATION

■

When registering ID codes

●

Normally, wheel position registration can be completed within approximately 30
minutes.

●

ID code registration is performed while driving at a vehicle speed of approximate-
ly 25 mph (40 km/h) or more.

■

If ID codes are not registered easily

●

In the following situations, ID code registration may take longer than usual to be
completed or may not be possible.

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•

When the vehicle has not been parked for approximately 15 minutes or more
before being driven

•

Vehicle is not driven at approximately 25 mph (40 km/h) or more

•

Vehicle is driven on unpaved roads

•

Vehicle is driven near other vehicles and system cannot recognize tire pressure
warning valve and transmitters of your vehicle over those of other vehicles

•

Wheel with tire pressure warning valve and transmitter installed is inside or
near the vehicle

●

If the vehicle is reversed during registration, all data collected until then will be
cleared. Perform driving again.

●

If registration does not complete after driving for 1 hour or more, perform the ID
code registration procedure again from the beginning.

●

If the ID codes cannot be registered even when performing the above procedure,
contact your Lexus dealer.

If the tire inflation pressure of the wheel set installed differs from that of the
previous set, it will be necessary to perform the tire inflation pressure setting
procedure of the tire pressure warning system.

If the specified tire inflation pressure is the same, it will not be necessary to perform the
tire inflation pressure setting procedure.

Related Links

Setting the tire pressure(P. 624)

Canceling ID code registration

To cancel ID code registration after it has been started, select [New tire registra-
tion] again on the center display.

If ID code registration has been canceled, the tire pressure warning light will turn off.
If the warning light does not turn off, ID code registration may not have been cancelled
correctly. To cancel registration, select [New tire registration] again on the center display.

Selecting wheel set

Your vehicle is equipped with a tire pressure warning system with a function to
register two sets of ID codes. This allows for registration of a second wheel set, for
example a winter set.

●

The wheel set can be changed only if a second wheel set has been registered to
the system. If a second wheel set has not been registered, "Set 2(Unregistered)"
will be displayed and it will not be possible to change to the selected wheel set.

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Maintenance and car

ID codes can be registered by yourself.

●

Only a change between both registered wheel set is possible, mixing between
these wheel sets is not supported.

●

While registering ID codes, it may not be possible to change between wheel
sets normally. Cancel registration before changing between wheel sets.

Install the desired wheel set.

Select

on the center display.

Select [Vehicle customize].

Select [Tire pressure].

Select the wheel set ([Set 1] or [Set 2]) displayed for the set selection setting.

Select the wheel set you wish to register, and then select [OK].

The tire pressure warning light will slowly blink 3 times, a message indicating that
change is occurring will be displayed, and the wheel set change will begin.
Wheel set change will begin and the tire pressure warning light will blink for 1 minute
and then illuminate. Also, while the change is being performed, "---" will be displayed
for the tire inflation pressure of each tire on the multi-information display.
After approximately 2 minutes, the wheel set
change will complete, the tire pressure warning
light will turn off, and a completion message will
be displayed on the multi-information display.
If changing does not complete after approximate-
ly 4 minutes, a message indicating that the change
could not be completed will be displayed.
Check which wheel set is installed and perform
the change procedure again from the beginning.

If the specified tire inflation pressure of the wheel set installed differs from that
of the previous set, it will be necessary to perform the tire inflation pressure
setting procedure of the tire pressure warning system.

If the specified tire inflation pressure is the same, it will not be necessary to perform the
tire inflation pressure setting procedure.

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Lexus NX450H+ (2024 year). Manual in english - page 19