Lexus NX350h (2022 year). Manual in english — page 34

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

561

Maintenance and car

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

562

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

563

Maintenance and car

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

564

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

565

Maintenance and car

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

566

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

567

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 power switch off.

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

8-4. Inspection of consumables

568

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

569

Maintenance and car

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

570

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 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.

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

571

Maintenance and car

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 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, 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
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

8-5. Tire maintenance

572

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

573

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

574

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.

●

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.

●

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.

8-5. Tire maintenance

575

Maintenance and car

•

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.

•

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 not
to able detect.

Lexus NX350h (2022 year). Manual in english — page 34

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