Lexus NX250 (2024 year). Manual in english

Vehicle interior maintenance items list

Items

Check points

Accelerator

pedal

The accelerator pedal should move smoothly. There should be no
uneven pedal effort or catching.

Automatic

transmission

“Park” mecha-

nism

When parked on a slope and the shift position is in P, is the vehicle
securely stopped?

Brake pedal

●

Does the brake pedal move smoothly?

●

Does the brake pedal have appropriate clearance from the floor?

●

Does the brake pedal have the correct amount of free play?

Brakes

●

The vehicle should not pull to one side when the brakes are applied.

●

The brakes should work effectively.

●

The brake pedal should not feel spongy.

●

The brake pedal should not get too close to the floor when the
brakes are applied.

Head restraints Do the head restraints move smoothly and lock securely?

Indicators/

buzzers

Do the indicators and buzzers function properly?

Lights

●

Do all the lights come on?

●

Are the headlights aimed correctly?

Parking brake

●

Does the parking brake switch operate normally?

●

When parked on a slope and the parking brake is on, is the vehicle
securely stopped?

Seat belts

●

Do the seat belts operate smoothly?

●

The seat belts should not be damaged.

Seats

Do the seat controls operate properly?

Steering wheel

●

Does the steering wheel rotate smoothly?

●

Does the steering wheel have the correct amount of free play?

●

There should not be any strange sounds coming from the steering
wheel.

8-3. Maintenance

504

Vehicle exterior maintenance items list

Items

Check points

Doors

Do the doors operate smoothly?

Engine hood Does the engine hood lock system work properly?

Fluid leaks

There should not be any signs of fluid leakage after the vehicle has been
parked.

Tires

●

Is the tire inflation pressure correct?

●

The tires should not be damaged or excessively worn.

●

Have the tires been rotated according to the maintenance schedule?

●

The wheel nuts should not be loose.

Windshield

wipers/rear

window wiper

●

The wiper blades should not show any signs of cracking, splitting,
wear, contamination or deformation.

●

The wiper blades should clear the windshield/rear window without
streaking or skipping.

8-3. Maintenance

505

Maintenance and car

Emission inspection and maintenance (I/M) programs

Some states have vehicle emission inspection programs which include OBD (On
Board Diagnostics) checks. The OBD system monitors the operation of the emis-
sion control system.

When the malfunction indicator lamp comes on

The OBD system determines that a problem exists somewhere in the emission
control system.
Your vehicle may not pass the I/M test and may need to be repaired. Contact your
Lexus dealer to service the vehicle.

Situations your vehicle may not pass the I/M test

Your vehicle may not pass the I/M test in the following situations:

●

When the battery is disconnected or discharged
Readiness codes that are set during ordinary driving are erased. Also, depend-
ing on your driving habits, the readiness codes may not be completely set.

●

When the fuel tank cap is loose
The malfunction indicator lamp comes on indicating a temporary malfunction
and your vehicle may not pass the I/M test.

When the malfunction indicator lamp still remains on after several
driving trips

The error code in the OBD system will not be cleared unless the vehicle is driven
40 or more times.

When your vehicle does not pass the I/M test

Contact your Lexus dealer to prepare the vehicle for re-testing.

8-3. Maintenance

506

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

●

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

●

Be careful not to touch the engine, 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 or the battery. Fuel and
battery fumes are flammable.

●

Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.

■

When working near the electric cooling fan or radiator grille

Be sure the engine switch is OFF.
With the engine 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:

■

Battery condition

●

Warm water

●

Baking soda

8-4. Inspection of consumables

507

Maintenance and car

●

Grease

●

Conventional wrench (for terminal clamp bolts)

●

Distilled water

■

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/intercooler 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

■

NX350: Radiator, condenser and intercooler radiator

■

NX250: Radiator and condenser

8-4. Inspection of consumables

508

■

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

509

Maintenance and car

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

■

When the hood is open (NX350)

Even if the engine switch is turned off, the cooling fan may continue to operate for a
short time. When the cooling fan is rotating, do not touch or approach the inside of
the engine compartment.

■

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

510

Engine compartment

Engine compartment components

▶

NX250

Fuse boxes

→

P.677

Engine oil filler cap

→

P.515

Engine oil level dipstick

→

P.513

Brake fluid reservoir

→

P.518

Battery

→

P.519

Radiator

→

P.517

Electric cooling fan

Condenser

→

P.517

Washer fluid tank

→

P.523

Engine coolant reservoir

→

P.515

8-4. Inspection of consumables

511

Maintenance and car

▶

NX350

Fuse boxes

→

P.677

Engine oil filler cap

→

P.515

Brake fluid reservoir

→

P.518

Battery

→

P.519

Radiator

→

P.517

Electric cooling fan

Condenser

→

P.517

Engine oil level dipstick

→

P.513

Intercooler radiator

→

P.517

Washer fluid tank

→

P.523

Intercooler coolant reservoir

→

P.515

Engine coolant reservoir

→

P.515

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

512

●

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

513

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 engine, 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

▶

NX250

▶

NX350

8-4. Inspection of consumables

514

●

Oil quantity (Low

→

Full)

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

●

Items
Clean funnel

Related Links

Lubrication system (NX350)(P. 687)
Lubrication system (NX250)(P. 688)

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.

▶

NX250

▶

NX350

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 engine is cold.

8-4. Inspection of consumables

515

Maintenance and car

■

Engine coolant reservoir

▶

NX250

Reservoir cap

[FULL] line

[LOW] line

▶

NX350

Reservoir cap

[FULL] line

[LOW] line

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

■

Intercooler coolant reservoir (NX350 only)

Reservoir cap

[FULL] line

[LOW] line

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

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.

8-4. Inspection of consumables

516

■

If the coolant level drops within a short time of replenishing

Visually check the radiator, hoses, engine coolant reservoir cap, 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 engine is hot, do not remove the engine coolant reservoir cap or intercooler
coolant reservoir cap (NX350 only).
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, condenser and intercooler radiator

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

WARNING

■

When the engine is hot

Do not touch the radiator, condenser or intercooler 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 engine 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 engine switch is OFF when working near the electric
cooling fan or radiator grille.

* :

If equipped

8-4. Inspection of consumables

517

Maintenance and car

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.

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

8-4. Inspection of consumables

518

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.

Battery

WARNING

■

Chemicals in the battery

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 precautions while working on or near the battery:

●

Do not cause sparks by touching the battery terminals with tools.

●

Do not smoke or light a match near the battery.

●

Avoid contact with eyes, skin and clothes.

●

Never inhale or swallow electrolyte.

●

Wear protective safety glasses when working near the battery.

●

Keep children away from the battery.

■

Where to safely charge the battery

Always charge the battery in an open area. Do not charge the battery in a garage or
closed room where there is insufficient ventilation.

8-4. Inspection of consumables

519

Maintenance and car

WARNING

■

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 there is insufficient battery fluid

Do not use if there is insufficient fluid in the battery. There is a possible danger that the
battery may explode.

Checking the battery

■

Battery exterior

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

▶

NX250

Terminals

Hold-down clamp

▶

NX350

Terminals

Hold-down clamp

8-4. Inspection of consumables

520

Before recharging

When recharging, the battery produces hydrogen gas which is flammable and
explosive. Therefore, observe the following precautions before recharging:

●

If recharging with the battery installed on the vehicle, be sure to disconnect the
ground cable.

●

Make sure the engine switch on the charger is off when connecting and discon-
necting the charger cables to the battery.

NOTICE

When recharging the battery, make sure that the engine is not running and all accesso-
ries are off.

After recharging or reconnecting the battery

The engine 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 engine.

INFORMATION

●

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

●

Start the engine with the engine switch in ACC. The engine may not start with
the engine switch turned off. However, the engine will operate normally from the
second attempt.

●

The engine switch mode is recorded by the vehicle. If the battery is disconnected
and reconnected, the vehicle will return the engine switch mode to the status it
was in before the battery was disconnected. Make sure to turn off the engine
switch before disconnecting the battery. Take extra care when connecting the
battery if the engine switch mode prior to the battery being disconnected is
unknown.
If the system will not start even after multiple attempts at all the methods above,
contact your Lexus dealer.

Checking battery fluid

Check that the level is between the [UPPER LEVEL] and [LOWER LEVEL] lines.
For some models, Check that the level is between the [max] and [min] lines.

8-4. Inspection of consumables

521

Maintenance and car

▶

NX250

[UPPER LEVEL] ([max]) line

[LOWER LEVEL] ([min]) line
If the battery fluid level is at or below the
[LOWER LEVEL] ([min]) line, add distilled
water.

▶

NX350

[UPPER LEVEL] ([max]) line

[LOWER LEVEL] ([min]) line
If the battery fluid level is at or below the
[LOWER LEVEL] ([min]) line, add distilled
water.

Adding distilled water

NOTICE

When adding distilled water, avoid overfilling the battery. Spilled battery fluid may cause
corrosion.

Remove the vent plug.

Add distilled water.

If the [UPPER LEVEL] ([max]) line cannot be seen, check the battery fluid level by
looking directly at the cell.

Low

O.K.

Put the vent plug back on and close it securely.

8-4. Inspection of consumables

522

Adding washer fluid

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

WARNING

Do not add washer fluid when the engine is hot or running.
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.

▶

NX250

▶

NX350

8-4. Inspection of consumables

523

Maintenance and car

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 engine switch off.

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

8-4. Inspection of consumables

524

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

525

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.

●

Vehicles with a compact spare tire: Do not tow if your vehicle has a compact spare tire
installed.

●

Vehicles with an emergency tire puncture repair kit: Do not tow anything if a tire that
has been repaired using the emergency tire puncture repair kit is installed. The load on
the tire may cause unexpected damage to the tire.

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.

8-5. Tire maintenance

527

Maintenance and car

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.

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.

8-5. Tire maintenance

528

■

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
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

529

Maintenance and car

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.

* :

If equipped

8-5. Tire maintenance

530

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

531

Maintenance and car

●

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 engine 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

532

•

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.

Lexus NX250 (2024 year). Manual in english - page 16