Lexus RX350h (2024 year). Manual in english

538

7-2. Steps to take in an emergency

Lower the vehicle.

Securely tighten the wheel bolts
two or three times in the order
shown in the illustration using a
wheel bolt wrench.

Tightening torque:

103 ft•lbf (140 N•m, 14.3 kgf•m)

Stow the flat tire, tire jack and all
tools.

■

The spare tire

●

The spare tire is identified by the label

“TEMPORARY USE ONLY” on the tire

sidewall.

●

Use the spare tire temporarily, and only in

an emergency.

●

Make sure to check the tire inflation pres-

sure of the spare tire. (



P.570)

■

When using the spare tire

As the spare tire is not equipped with a tire

pressure warning valve and transmitter, low

inflation pressure of the spare tire will not be

indicated by the tire pressure warning sys-

tem. Also, if you replace the spare tire after

the tire pressure warning light comes on,

the light remains on.

■

When the spare tire is equipped

The vehicle becomes lower when driving

with the spare tire compared to when driv-

ing with standard tires.

■

If you have a flat front tire on a road cov-

ered with snow or ice

Install the spare tire on one of the rear

wheels of the vehicle. Perform the following

steps and fit tire chains to the front tires:

Replace a rear tire with the spare tire.

Replace the flat front tire with the tire

removed from the rear of the vehicle.

Fit tire chains to the front tires.

WARNING

■

Installing the spare tire

Failure to follow these precautions could

cause the wheel bolts to loosen and the

tire to fall off, resulting in death or serious

injury.

●

The contact surfaces of the wheel bolt

and wheel are designed specifically to

fit together. When using wheels that

were installed when the vehicle was

shipped from the factory, use special-

ized Lexus genuine wheel bolts. Do

not use wheel bolts designed for other

models, model years or types even if

they are Lexus genuine parts. If the

vehicle does not have wheels that were

installed to the vehicle when it was

shipped from the factory, the fac-

tory-installed wheel bolts may not be

appropriate for the wheel. Contact

either the retailer where the wheels

were purchased or the manufacturer

of the wheels for proper installation

advice.

539

7-2. Steps to take in an emergency

n t

ris

WARNING

●

Never apply oil or grease to the wheel

bolts or their contact surface on the

wheel .

Doing so may cause the wheel bolts to

be tightened excessively, leading to

damage to the wheel bolts, the

threaded portion the wheel bolts install

, or the wheel.

Remove any oil or grease that has

adhered when installing the wheel

bolts.



Steel wheel



Aluminum wheel

●

After replacing a tire, check the tight-

ening torque as soon as possible.

●

Do not attach a heavily damaged

wheel ornament, as it may fly off the

wheel while the vehicle is moving.

●

If a wheel bolt hole in a wheel or the

threads of a wheel bolt or the wheel

hub are deformed, cracked, rusty or

otherwise damaged, have the vehicle

inspected by your Lexus dealer.

■

When tightening the wheel bolts

Do not tighten the wheel bolts exces-

sively. Doing so may cause the wheel

bolts, the threads of the wheel hub, or the

wheel to be damaged.

■

Guide pin

When removing or installing a tire, make

sure to use the guide pin.

Also, the guide pin is made of resin. It

may be damaged if the wheel is placed

anywhere other than

or if a large

amount of force is applied to the guide

pin.

■

When using the spare tire

●

Remember that the spare tire provided

is specifically designed for use with

your vehicle. Do not use your spare

tire on another vehicle.

●

Do not use more than one spare tire

simultaneously.

●

Replace the spare tire with a standard

tire as soon as possible.

●

Avoid sudden acceleration, abrupt

steering, sudden braking and shifting

operations that cause sudden engine

braking.

■

When the spare tire is attached

The vehicle speed may not be correctly

detected, and the following systems may

not operate correctly:

• ABS & Brake assist

• VSC

• TRAC

540

7-2. Steps to take in an emergency

WARNING

• Trailer Sway Control

• EPS

• VDIM (if equipped)

• Adaptive Variable Suspension System

(if equipped)

• Dynamic radar cruise control

• PCS (Pre-Collision System)

• LTA (Lane Tracing Assist)

• LDA (Lane Departure Alert)

• RSA (Road Sign Assist) (if equipped)

• AHB (Automatic High Beam)

• AHS (Adaptive High-beam System) (if

equipped)

• Tire pressure warning system

• Intuitive parking assist

• PKSB (Parking Support Brake) (if

equipped)

• Lexus parking assist monitor (if

equipped)

• Panoramic view monitor (if equipped)

• BSM (Blind Spot Monitor)

• RCTA (Rear cross traffic alert)

• Safe Exit Assist (with door opening

control)

• Navigation system (if equipped)

Also, not only can the following system

not be utilized fully, but it may even nega-

tively affect the drive-train components:

• E-Four

/DIRECT4

(Electronic

AWD system)

: RX350h

: RX500h

■

Speed limit when using the spare tire

Do not drive at speeds in excess of 50

mph (80 km/h) when a spare tire is

installed on the vehicle.

The spare tire is not designed for driving

at high speeds. Failure to observe this

precaution may lead to an accident caus-

ing death or serious injury.

■

After using the tools and jack

Before driving, make sure all the tools

and jack are securely in place in their

storage location to reduce the possibility

of personal injury during a collision or

sudden braking.

NOTICE

■

Be careful when driving over bumps

with the spare tire installed on the

vehicle

The vehicle becomes lower when driving

with the spare tire compared to when

driving with standard tires. Be careful

when driving over uneven road surfaces.

■

Driving with tire chains and the spare

tire

Do not fit tire chains to the spare tire.

Tire chains may damage the vehicle body

and adversely affect driving perfor-

mance.

■

When replacing the tires

When removing or fitting the wheels,

tires or the tire pressure warning valve

and transmitter, contact your Lexus

dealer as the tire pressure warning valve

and transmitter may be damaged if not

handled correctly.

541

7-2. Steps to take in an emergency

When trouble

ari

ses

One of the following may be the cause
of the problem:



The electronic key may not be func-
tioning properly. (



P.544)



There may not be sufficient fuel in
the vehicle’s tank.
Refuel the vehicle.



There may be a malfunction in the
immobilizer system. (



P.73)



There may be a malfunction in the
shift control system.

(



P.202, 521)



There may be a malfunction in the
steering lock system.



The hybrid system may be malfunc-
tioning due to an electrical problem
such as electronic key battery
depletion or a blown fuse. However,
depending on the type of malfunc-
tion, an interim measure is available
to start the hybrid system.
(



P.542)



There is a possibility that the tem-
perature of the hybrid battery (trac-
tion battery) is extremely low

(approximately below -22°F
[-30°C]). (



P.201)

: It may not be possible to shift the shift

position from P.

One of the following may be the cause
of the problem:



The 12-volt battery may be dis-
charged. (



P.548)



The 12-volt battery terminal con-
nections may be loose or corroded.
(



P.475)

One of the following may be the cause
of the problem:



One or both of the 12-volt battery
terminals may be disconnected.
(



P.475)



The 12-volt battery may be dis-
charged. (



P.548)

Contact your Lexus dealer if the problem
cannot be repaired, or if repair procedures
are unknown.

When the hybrid system does not start,
the following steps can be used as an
interim measure to start the hybrid sys-

If the hybrid system will not
start

Reasons for the hybrid system not
starting vary depending on the situ-
ation. Check the following and per-
form the appropriate procedure:

The hybrid system will not start
even though the correct starting
procedure is being followed.
(



P.200)

The interior lights and head-
lights are dim, or the horn does
not sound or sounds at a low vol-
ume.

The interior lights and head-
lights do not turn on, or the horn
does not sound.

Starting the hybrid system in an
emergency

542

7-2. Steps to take in an emergency

tem if the power switch is functioning
normally.
Do not use this starting procedure
except in cases of emergency.

Pull the parking brake switch to
check that the parking brake is set.
(



P.218)

Parking brake indicator will come on.

Turn the power switch to ACC.

*1, *2

Press and hold the power switch for
about 15 seconds while depressing
the brake pedal firmly.

Even if the hybrid system can be
started using the above steps, the sys-
tem may be malfunctioning. Have the
vehicle inspected by your Lexus dealer.

: ACC mode can be enabled/disabled

on the customize menu. (



P.585)

: When ACC is disabled, turn the power

switch to ON then OFF, and start the
hybrid system as described in
P.545within 5 seconds.

If you lose your keys

New genuine mechanical keys can
be made by your Lexus dealer using
another mechanical key and the
key number stamped on your key
number plate.

Keep the plate in a safe place such
as your wallet, not in the vehicle.

NOTICE

■

When an electronic key is lost

If the electronic key remains lost, the risk

of vehicle theft increases significantly.

Visit your Lexus dealer immediately with

all remaining electronic keys that were

provided with your vehicle.

543

7-2. Steps to take in an emergency

n t

ris

■

When the electronic key does not work

properly

●

Check on the center display if the smart

access system with push-button start is

enabled. If disabled, change to enable the

smart access system with push-button

start.

●

Check if battery-saving mode is set. If it is

set, cancel the function. (



P.132)

●

The electronic key function may be sus-

pended. (



P.106)

Use the mechanical key (



P.108) in

order to perform the following opera-
tions:

Insert a plastic card, etc. into the
gap in the door handle to pry up the
cover.

To avoid damage, do not apply excessive

force to the cover.

Remove the cover by pressing it on
the rear.

Use the mechanical key in order to
perform the following operations:

Unlocks all the doors

Turning the key rearward unlocks the
driver’s door. Turning the key again unlocks
the other doors.

Locks all the doors

If the electronic key does not
operate properly

If communication between the
electronic key and vehicle is inter-
rupted (



P.133) or the electronic

key cannot be used because the
battery is depleted, the smart
access system with push-button
start and wireless remote control
cannot be used. In such cases, the
doors can be opened and the hybrid
system can be started by following
the procedure below.

NOTICE

■

In case of a smart access system with

push-button start malfunction or

other key-related problems

Take your vehicle with all the electronic

keys provided with your vehicle to your

Lexus dealer.

Locking and unlocking the doors

544

7-2. Steps to take in an emergency

■

Key linked functions

Closes the windows and the moon
roof

or panoramic moon roof

(turn

and hold)

Opens the windows and the moon
roof

or panoramic moon roof

(turn

and hold)

These settings must be customized at your

Lexus dealer.

: If equipped

Ensure that the shift position is in P
and depress the brake pedal.

Touch the Lexus emblem side of the
electronic key to the power switch.

When the electronic key is detected, a

buzzer will sound and the power switch

mode will change to ON.
When the smart access system with

push-button start is deactivated in custom-

ization setting, the power switch will turn to

ACC.

Firmly depress the brake pedal and
check that

is shown on the

multi-information display.

Press the power switch shortly and
firmly.

In the event that the hybrid system still
cannot be started, contact your Lexus
dealer.

■

Stopping the hybrid system

Shift the shift lever to P, set the parking

brake, and press the power switch as you

normally do when stopping the hybrid sys-

tem.

■

Replacing the key battery

As the above procedure is a temporary

measure, it is recommended that the elec-

tronic key battery be replaced immediately

when the battery is depleted. (



P.495)

■

Changing power switch modes

Release the brake pedal and press the

power switch in step

above. The hybrid

system does not start and modes will be

changed each time the switch is pressed.

(



P.203)

WARNING

■

When using the mechanical key and

operating the power windows or the
moon roof

or panoramic moon roof

: If equipped

Operate the power window or the moon

roof or panoramic moon roof after

checking to make sure that there is no

possibility of any passenger having any of

their body parts caught in the window or

the moon roof or panoramic moon roof.

Also, do not allow children to operate the

mechanical key. It is possible for children

and other passengers to get caught in

the power window or the moon roof or

panoramic moon roof.

Starting the hybrid system

545

7-2. Steps to take in an emergency

n t

ris

■

Opening a door using the manual
release handle from outside the
vehicle

Pull the manual release handle to
open the door.

Normally, the manual release handles can-
not be used to open the doors.
To open a door, enable manual release
handle operation. (



P.547)

■

Opening a door using the manual
release handle from inside the
vehicle

Pull the manual release handle
twice to open the door.

Pulling the handle once will enable opera-
tion. Pulling the handle again will open the
door.

■

Manual release handle operating condi-

tions

●

When the vehicle is involved in a collision

The manual release handle may not

become operable depending on the force

of the impact and conditions of the colli-

sion.

●

When the 12-volt battery voltage drops

slowly while a door was unlocked

It may not work depending on how it is low-

ered.

●

When manual release handle operation

is enabled from inside the vehicle

●

When manual release handle operation

is enabled from outside the vehicle using

the mechanical key

If a door cannot be opened
using the door opener switch

If a door cannot be opened using
the door opener switch, it can be
opened using a manual release
handle.

NOTICE

■

Operating a manual release handle

Normally, the manual release handles

cannot be used to open the doors. To

enable manual release handle operation,

perform the following. If the following is

not performed and/or a manual release

handle is operated with force, it may

deform or be damaged.

Opening a door using the man-
ual release handle

546

7-2. Steps to take in an emergency

■

Enabling outside manual release handle

operation using the mechanical key

Operation of a manual release handle can

be enabled by unlocking a door with the

mechanical key.

Insert a plastic card, etc. into the gap in

the door handle to pry up the cover.

To avoid damage, do not apply excessive

force to the cover.

Remove the cover by pressing it on the

rear.

Using the mechanical key, turn the lock

cylinder to the unlock side to enable the

manual release handle operation.

The mechanical key can only be inserted in

one direction, as the key only has a groove

on one side.
If the key cannot be inserted in a lock cylin-

der, turn it over and re-attempt to insert it.

■

Conditions which manual release han-

dle operation is disabled

●

Normally, operation of the outside man-

ual release handles is disabled, and they

cannot be used to open the doors.

When operation is enabled by operating a

manual release handle or using a mechani-

cal key, operation will be disabled automat-

ically if the door is opened using the door

opener switch or locked.

●

Operation of the inside manual release

handles is disabled when the power

switch is in ON, and they cannot be used

to open the doors.

When operation is enabled by operating a

manual release handle or using a mechani-

cal key, operation will be disabled automat-

ically if the door is opened using the door

opener switch or locked.

●

To prevent a door from being opened

accidentally, when the power switch is in

ON, after an inside manual release han-

dle is operated once, operation will auto-

matically be disabled after approximately

1 second.

547

7-2. Steps to take in an emergency

When trouble

ari

ses

If you have a set of jumper (or booster)
cables and a second vehicle with a
12-volt battery, you can jump start your
vehicle by following the steps below.

Confirm that the electronic key is
being carried.

When connecting the jumper (or booster)

cables, depending on the situation, the

alarm may activate and doors locked.

(



P.75)

Open the hood (



P.465) and fuse

box cover.



RX500h

If the 12-volt battery is dis-
charged

The following procedures may be
used to start the hybrid system if the
vehicle’s 12-volt battery is dis-
charged.
You can also call your Lexus dealer
or a qualified repair shop.

Restarting the hybrid system

549

7-2. Steps to take in an emergency

When trouble

ari

ses

Exclusive jump starting terminal (your vehicle)
Positive (+) battery terminal (second vehicle)
Negative (-) battery terminal (second vehicle)
Metallic point shown in the illustration



RX350h

Exclusive jump starting terminal (your vehicle)
Positive (+) battery terminal (second vehicle)
Negative (-) battery terminal (second vehicle)
Metallic point shown in the illustration

Start the engine of the second vehi-
cle. Increase the engine speed
slightly and maintain at that level for
approximately 5 minutes to
recharge the 12-volt battery of your
vehicle.

Open and close any of the doors of
your vehicle with the power switch
off.

Maintain the engine speed of the
second vehicle and start the hybrid
system of your vehicle by turning
the power switch to ON.

Make sure the “READY” indicator
comes on. If the indicator light does

not come on, contact your Lexus
dealer.

Once the hybrid system has
started, remove the jumper cables
in the exact reverse order from
which they were connected.

Close the exclusive jump starting
terminal cover, and reinstall the fuse
box cover to its original position.

Once the hybrid system starts, have
the vehicle inspected at your Lexus
dealer as soon as possible.

A
B
C
D

550

7-2. Steps to take in an emergency

■

Starting the hybrid system when the

12-volt battery is discharged

The hybrid system cannot be started by

push-starting.

■

If the doors cannot be unlocked using

the smart access system with push-but-

ton start or wireless remote control

The doors can be opened by enabling its

respective manual release handle opera-

tion. (



P.547)

■

Locking the doors after the 12-volt bat-

tery was discharged

The doors cannot be locked using the smart

access system with push-button start or

wireless remote control.
By locking the door using the mechanical

key, the operation of the manual release

handle can be disabled.



Driver’s door

Insert a plastic card, etc. into the gap in

the door handle to pry up the cover.

To avoid damage, do not apply excessive

force to the cover.

Remove the cover by pressing it on the

rear.

Using the mechanical key, turn the lock

cylinder to the unlock side to enable the

manual release handle operation.

Check that the door cannot be opened.



Doors other than the driver’s door

Open the door. Using the mechanical

key, slide the cover in the direction

shown in the illustration.

To avoid damage, do not apply excessive

force to the cover.

Insert the mechanical key into the open-

ing.

Remove the mechanical key and slide

the cover back to its original position.

551

7-2. Steps to take in an emergency

When trouble

ari

ses

Check that all of the doors cannot be

opened.

■

To prevent 12-volt battery discharge

●

Turn off the headlights and the audio sys-

tem while the hybrid system is off.

●

Turn off any unnecessary electrical com-

ponents when the vehicle is running at a

low speed for an extended period, such

as in heavy traffic.

■

When the 12-volt battery is removed or

discharged

●

Information stored in the ECU is cleared.

When the 12-volt battery is depleted,

have the vehicle inspected at your Lexus

dealer.

●

Some systems may require initialization.

(



P.602)

■

When removing the 12-volt battery ter-

minals

●

When the 12-volt battery terminals are

removed, the information stored in the

ECU is cleared. Before removing the

12-volt battery terminals, contact your

Lexus dealer.

●

If a 12-volt battery terminal is discon-

nected, the doors will not be able to be

opened using the door opener switches

and the electronic key may become

trapped in the vehicle

To prevent the electronic key (mechanical

key) from being locked inside the vehicle,

make sure to remove it from the vehicle

before disconnecting a 12-volt battery ter-

minal.

●

If the electronic key (mechanical key) is

to be left in the vehicle, make sure to

open a window so an inside manual

release handle can be operated.

■

Charging the 12-volt battery

The electricity stored in the 12-volt battery

will discharge gradually even when the

vehicle is not in use, due to natural dis-

charge and the draining effects of certain

electrical appliances. If the vehicle is left for

a long time, the 12-volt battery may dis-

charge, and the hybrid system may be

unable to start. (The 12-volt battery

recharges automatically while the hybrid

system is operating.)

■

When recharging or replacing the

12-volt battery

●

In some cases, it may not be possible to

unlock the doors using the smart access

system with push-button start when the

12-volt battery is discharged. Use the

wireless remote control or the mechani-

cal key to lock or unlock the doors.

●

The hybrid system may not start on the

first attempt after the 12-volt battery has

recharged but will start normally after the

second attempt. This is not a malfunction.

●

The power switch mode is memorized by

the vehicle. When the 12-volt battery is

reconnected, the system will return to the

mode it was in before the 12-volt battery

was discharged. Before disconnecting

the 12-volt battery, turn the power switch

off.

If you are unsure what mode the power

switch was in before the 12-volt battery

discharged, be especially careful when

reconnecting the 12-volt battery.

●

If the 12-volt battery discharges, it may

not be possible to shift the shift position to

other positions. In this case, the vehicle

cannot be towed without lifting both front

wheels because the front wheels will be

locked.

●

Some systems may require initialization.

(



P.602)

552

7-2. Steps to take in an emergency

■

When replacing the 12-volt battery

●

Use a Central Degassing type 12-volt

battery (European Regulations).

●

RX500h: Use a 12-volt battery that the

case size is same as the previous one

(LN3), 20 hour rate capacity (20HR) is

equivalent (70Ah) or greater, and perfor-

mance rating (CCA) is equivalent

(603A) or greater.

RX350h: Use a 12-volt battery that the

case size is same as the previous one

(LN2), 20 hour rate capacity (20HR) is

equivalent (60Ah) or greater, and per-

formance rating (CCA) is equivalent

(563A) or greater.

• If the sizes differ, the 12-volt battery can-

not be properly secured.

• If the 20 hour rate capacity is low, even if

the time period where the vehicle is not

used is a short time, the 12-volt battery

may discharge and the hybrid system

may not be able to start.

●

Use a 12-volt battery with a handle. If a

12-volt battery without a handle is used,

removal is more difficult.

●

After replacing, firmly attach the follow-

ing items to the exhaust hole of the

12-volt battery.

• Use the exhaust hose that was attached

to the 12-volt battery before replacing

and confirm that it is firmly connected to

the hole section of the vehicle.

• Use the exhaust hole plug included with

the 12-volt battery replaced or the one

installed on the 12-volt battery prior to

the replacement. (Depending on the

12-volt battery to be replaced, the

exhaust hole may be plugged.)

Exhaust hole plug
Exhaust hole
Exhaust hose
Hole section of the vehicle

For details, consult your Lexus dealer.

WARNING

■

When removing the 12-volt battery

terminals

Always remove the negative (-) terminal

first. If the positive (+) terminal contacts

any metal in the surrounding area when

the positive (+) terminal is removed, a

spark may occur, leading to a fire in addi-

tion to electrical shocks and death or

serious injury.

■

Avoiding 12-volt battery fires or

explosions

Observe the following precautions to

prevent accidentally igniting the flamma-

ble gas that may be emitted from the

12-volt battery:

●

Make sure each jumper cable is con-

nected to the correct terminal and that

it is not unintentionally in contact with

any other than the intended terminal.

A
B
C
D

553

7-2. Steps to take in an emergency

n t

ris

WARNING

●

Do not allow the other end of the

jumper cable connected to the “+” ter-

minal to come into contact with any

other parts or metal surfaces in the

area, such as brackets or unpainted

metal.

●

Do not allow the + and - clamps of the

jumper cables to come into contact

with each other.

●

Do not smoke, use matches, cigarette

lighters or allow open flame near the

12-volt battery.

■

12-volt battery precautions

The 12-volt battery contains poisonous

and corrosive acidic electrolyte, while

related parts contain lead and lead com-

pounds. Observe the following precau-

tions when handling the 12-volt battery:

●

When working with the 12-volt battery,

always wear safety glasses and take

care not to allow any battery fluids

(acid) to come into contact with skin,

clothing or the vehicle body.

●

Do not lean over the 12-volt battery.

●

In the event that battery fluid comes

into contact with the skin or eyes,

immediately wash the affected area

with water and seek medical attention.

Place a wet sponge or cloth over the

affected area until medical attention

can be received.

●

Always wash your hands after handling

the 12-volt battery support, terminals,

and other battery-related parts.

●

Do not allow children near the 12-volt

battery.

■

After recharging the 12-volt battery

Have the 12-volt battery inspected at

your Lexus dealer as soon as possible.

If the 12-volt battery is deteriorating, con-

tinued use may cause the 12-volt battery

to emit a malodorous gas, which may be

detrimental to the health of passengers.

■

When replacing the 12-volt battery

●

When the vent plug and indicator are

close to the hold down clamp, the bat-

tery fluid (sulfuric acid) may leak.

●

For information regarding 12-volt bat-

tery replacement, contact your Lexus

dealer.

●

After replacing, securely attach the

exhaust hose and exhaust hole plug to

the exhaust hole of the replaced

12-volt battery. If not properly installed,

gases (hydrogen) may leak into the

vehicle interior, and there is the possi-

ble danger of the gas igniting and

exploding.

■

When disconnecting the 12-volt bat-

tery

Do not disconnect the negative (-) termi-

nal on the body side. The disconnected

negative (-) terminal may touch the posi-

tive (+) terminal, which may cause a short

and result in death or serious injury.

NOTICE

■

When handling jumper cables

When connecting the jumper cables,

ensure that they do not become entan-

gled in the cooling fan or belt.

■

When connecting jumper cables

Make sure to connect jumper cables to

the specified terminals and connecting

point. Failure to do so may adversely

affect the electronic devices or damage

to them.

■

To prevent damaging the vehicle

The exclusive jump starting terminal is to

be used when charging the 12-volt bat-

tery from another vehicle in an emer-

gency. It cannot be used to jump start

another vehicle.

554

7-2. Steps to take in an emergency



“Engine Coolant Temp High Stop in
a Safe Place See Owner’s Manual”
is shown on the multi-information
display

Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the hybrid system.

If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.

After the hybrid system has cooled
down sufficiently, inspect the hoses
and radiator core (radiator) for any
leaks.



RX500h

Radiator
Cooling fan

If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.



RX350h

Radiator
Cooling fan

If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.

The coolant level is satisfactory if it
is between the “MAX”/“FULL” and
“MIN”/“LOW” lines on the reser-
voir.

If your vehicle overheats

The following may indicate that
your vehicle is overheating.



The engine coolant temperature
gauge (



P.82) is in the red zone

or a loss of hybrid system power is
experienced. (For example, the
vehicle speed does not increase.)



“Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” or “Hybrid System
Overheated Output Power
Reduced” is shown on the
multi-information display.



Steam comes out from under the
hood.

Correction procedures

A
B

555

7-2. Steps to take in an emergency

When trouble

ari

ses



Engine (RX500h)

Reservoir
“FULL” line
“LOW” line
Radiator cap



Engine (RX350h)

Reservoir
“FULL” line
“LOW” line
Radiator cap



Intercooler (RX500h only)

Reservoir
“MAX” line
“MIN” line

Add coolant if necessary.

Water can be used in an emergency if

coolant is unavailable.



Engine (RX500h)



Engine (RX350h)



Intercooler (RX500h only)

Start the hybrid system and turn the
air conditioning system on to check
that the radiator cooling fan oper-

A
B
C
D

A
B
C

556

7-2. Steps to take in an emergency

ate and to check for coolant leaks
from the radiator or hoses.

The fan operate when the air conditioning

system is turned on immediately after a

cold start. Confirm that the fan is operating

by checking the fan sound and air flow. If it

is difficult to check these, turn the air con-

ditioning system on and off repeatedly.

(The fan may not operate in freezing tem-

peratures.)

If the fan is not operating:
Stop the hybrid system immediately
and contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the
nearest Lexus dealer.

Check if “Engine Coolant Temp
High Stop in a Safe Place See
Owner’s Manual” is shown on the
multi-information display.

If the message does not disappear:

Stop the hybrid system and contact your

Lexus dealer.

If the message is not displayed:

Have the vehicle inspected at the nearest

Lexus dealer.



If “Hybrid System Overheated Out-
put Power Reduced” is shown on the
multi-information display

Stop the vehicle in a safe place.

Stop the hybrid system and care-
fully lift the hood.

After the hybrid system has cooled
down, inspect the hoses and radia-
tor core (radiator) for any leaks.



RX500h

Radiator
Cooling fan

If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.



RX350h

Radiator
Cooling fan

If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.

The coolant level is satisfactory if it
is between the “MAX”/“FULL” and
“MIN”/“LOW” lines on the reser-
voir.

A
B

557

7-2. Steps to take in an emergency

n t

ris



RX500h

Reservoir
“MAX” line
“MIN” line



RX350h

Reservoir
“FULL” line
“LOW” line

Add coolant if necessary.

Water can be used in an emergency if

coolant is unavailable.



RX500h



RX350h

Start the hybrid system and check if
“Hybrid System Overheated Out-
put Power Reduced” is shown on
the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact
your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the
nearest Lexus dealer.

A
B
C

WARNING

■

When inspecting under the hood of

your vehicle

Observe the following precautions.

Failure to do so may result in serious

injury such as burns.

●

If steam is seen coming from under the

hood, do not open the hood until the

steam has subsided. The engine com-

partment may be very hot.

●

RX350h: After the hybrid system has

been turned off, check that the

“READY” indicator is off.

When the hybrid system is operating,

the gasoline engine may automatically

start, or the cooling fan may suddenly

operate even if the gasoline engine

stops. Do not touch or approach rotat-

ing parts such as the fan, which may

lead to fingers or clothing (especially a

tie, a scarf or a muffler) getting caught,

resulting in serious injury.

558

7-2. Steps to take in an emergency

Stop the hybrid system. Set the
parking brake and shift the shift
position to P.

Remove the mud, snow or sand
from around the front wheels.

Place wood, stones or some other
material under the front wheels to
help provide traction.

Restart the hybrid system.

Shift the shift position to D or R and
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal.

■

When it is difficult to free the vehicle

Press

to turn off TRAC.



RX500h

WARNING

●

RX500h: After the hybrid system has

been turned off, check that the

“READY” indicator is off.

When the hybrid system is operating,

the gasoline engine may automatically

start, or the cooling fan may suddenly

operate even if the gasoline engine

stops. Also, the cooling fan may oper-

ate for a while after turning off the

hybrid system. Do not touch or

approach rotating parts such as the

fan, which may lead to fingers or cloth-

ing (especially a tie, a scarf or a muf-

fler) getting caught, resulting in serious

injury.

●

Do not loosen the radiator cap and the

coolant reservoir caps while the hybrid

system and radiator are hot.

High temperature steam or coolant

could spray out.

NOTICE

■

When adding engine/power control

unit coolant

Add coolant slowly after the hybrid sys-

tem has cooled down sufficiently. Adding

cool coolant to a hot hybrid system too

quickly can cause damage to the hybrid

system.

■

To prevent damage to the cooling sys-

tem

Observe the following precautions:

●

Avoid contaminating the coolant with

foreign matter (such as sand or dust,

etc.).

●

Do not use any coolant additive.

If the vehicle becomes stuck

Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:

Recovering procedure

559

7-2. Steps to take in an emergency

n t

ris



RX350h

WARNING

■

When attempting to free a stuck vehi-

cle

If you choose to push the vehicle back

and forth to free it, make sure the sur-

rounding area is clear to avoid striking

other vehicles, objects or people. The

vehicle may also lunge forward or lunge

back suddenly as it becomes free. Use

extreme caution.

■

When shifting the shift position

Be careful not to shift the shift position

with the accelerator pedal depressed.

This may lead to unexpected rapid accel-

eration of the vehicle that may cause an

accident resulting in death or serious

injury.

NOTICE

■

To avoid damage to the transmission

and other components

●

Avoid spinning the front wheels and

depressing the accelerator pedal

more than necessary.

●

If the vehicle remains stuck even after

these procedures are performed, the

vehicle may require towing to be freed.

562

8-1. Specifications

8-1.Specifications

: Unladen vehicle

: RX350h

: RX500h

: Vehicles with towing package

■

Vehicle identification number

The vehicle identification number
(VIN) is the legal identifier for your
vehicle. This is the primary identifica-
tion number for your Lexus. It is used in
registering the ownership of your vehi-
cle.
This number is stamped on the top left

of the instrument panel.

Maintenance data (fuel, oil level, etc.)

Dimensions and weight

Overall length

192.5 in. (4890 mm)

Overall width

75.6 in. (1920 mm)

Overall height

67.3 in. (1710 mm)

Wheelbase

112.2 in. (2850 mm)

Tread

Front

64.9 in. (1649.5 mm)

Rear

65.6 in. (1666.9 mm)

65.7 in. (1667.9 mm)

Vehicle capacity weight
(Occupants + luggage)

1110 lb. (505 kg)

Trailer Weight Rating

(Trailer weight + cargo weight)

3500 lb. (1588 kg)

Seating capacity

5 (Front 2, Rear 3)

Vehicle identification

563

8-1. Specifications

Vehi

cle

spec

ifi

tions

This number is also on the Certification
Label.

■

Engine number

The engine number is stamped on the

engine block as shown.



RX350h



RX500h



RX350h



RX500h

Engine

Model

A25A-FXS

Type

4-cylinder in line, 4-cycle, gasoline

Bore and stroke

3.44



4.07 in. (87.5



103.4 mm)

Displacement

151.8 cu. in. (2487 cm

)

Valve clearance (engine cold)

Automatic adjustment

Model

T24A-FTS

Type

4-cylinder in line, 4-cycle, gasoline (with tur-
bocharger)

Bore and stroke

3.44



3.92 in. (87.5



99.5 mm)

564

8-1. Specifications



Front



Rear



Front

Displacement

146.0 cu. in. (2393 cm

)

Valve clearance (engine cold)

Automatic adjustment

Drive belt tension

Automatic adjustment

Fuel

Fuel type

Unleaded gasoline only

Octane Rating



RX350h

91AKI (Research Octane Number 96) or
higher [recommended]
87AKI (Research Octane Number 91) or
higher [minimum]



RX500h

91AKI (Research Octane Number 96) or
higher

Fuel tank capacity
(Reference)

17.2 gal. (65 L, 14.3 Imp. gal.)

Electric motor (traction motor) (RX350h)

Type

Permanent magnet synchronous motor

Maximum output

134 kW

Maximum torque

199 ft•lbf (270 N•m, 27.5 kgf•m)

Type

Permanent magnet synchronous motor

Maximum output

40 kW

Maximum torque

89 ft•lbf (121 N•m, 12.3 kgf•m)

Electric motor (traction motor) (RX500h)

Type

Permanent magnet synchronous motor

565

8-1. Specifications

Vehi

cle

spec

ifi

tions



Rear



RX350h



RX500h

■

Oil capacity (Drain and refill



ref-

erence

)



RX350h



RX500h

: The engine oil capacity is a reference

quantity to be used when changing the
engine oil. When actually adding the
engine oil, make sure that the oil level is

Maximum output

64 kW

Maximum torque

215 ft•lbf (292 N•m, 29.8 kgf•m)

Type

Permanent magnet synchronous motor

Maximum output

75.9 kW

Maximum torque

124 ft•lbf (168.5 N•m, 17.2 kgf•m)

Hybrid battery (traction battery)

Type

Nickel-Metal hydride battery

Voltage

1.2 V/cell

Capacity

5 Ah

Quantity

216 cells

Nominal voltage

259.2 V

Type

Nickel-Metal hydride battery

Voltage

1.2 V/cell

Capacity

5 Ah

Quantity

240 cells

Nominal voltage

288 V

Lubrication system

With filter

4.5 qt. (4.3 L, 3.8 Imp. qt.)

Without fil-
ter

4.2 qt. (4.0 L, 3.5 Imp. qt.)

With filter

5.6 qt. (5.3 L, 4.7 Imp. qt.)

Without fil-
ter

5.3 qt. (5.0 L, 4.4 Imp. qt.)

566

8-1. Specifications

between the low level mark and refill
upper limit mark (



P.470). Warm up

the engine and turn off the hybrid sys-
tem, wait about 5 minutes, and check the
oil level on the dipstick.

■

Engine oil selection (RX350h)

“Toyota Genuine Motor Oil” is used in
your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil”
or equivalent to satisfy the following
grade and viscosity.
Oil grade: ILSAC GF-6B multigrade
engine oil
Recommended viscosity: SAE 0W-16
SAE 0W-16 is the best choice for good
fuel economy and good starting in cold
weather.
If SAE 0W-16 is not available, SAE
0W-20 oil may be used. However, it
must be replaced with SAE 0W-16 at
the next oil change.

Outside temperature

Oil viscosity (0W-16 is explained here
as an example):
• The 0W in 0W-16 indicates the

characteristic of the oil which allows
cold startability. Oils with a lower
value before the W allow for easier
starting of the engine in cold
weather.

• The 16 in 0W-16 indicates the vis-

cosity characteristic of the oil when
the oil is at high temperature. An oil
with a higher viscosity (one with a
higher value) may be better suited if
the vehicle is operated at high
speeds, or under extreme load con-
ditions.

How to read oil container label:
API registered marks is added to some
oil containers to help you select the oil
you should use.

■

Engine oil selection (RX500h)

“Toyota Genuine Motor Oil” is used in
your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil”
or equivalent to satisfy the following
grade and viscosity.
Oil grade: ILSAC GF-6A multigrade
engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the best choice for
good fuel economy and good starting
in cold weather.
If SAE 0W-20 is not available, SAE
5W-20 oil may be used. However, it
must be replaced with SAE 0W-20 at
the next oil change.

567

8-1. Specifications

Vehi

cle

spec

ifi

tions

Outside temperature

Oil viscosity (0W-20 is explained here
as an example):
• The 0W in 0W-20 indicates the

characteristic of the oil which allows
cold startability. Oils with a lower
value before the W allow for easier
starting of the engine in cold
weather.

• The 20 in 0W-20 indicates the vis-

cosity characteristic of the oil when
the oil is at high temperature. An oil

with a higher viscosity (one with a
higher value) may be better suited if
the vehicle is operated at high
speeds, or under extreme load con-
ditions.

How to read oil container label:
The International Lubricant Specifica-
tion Advisory Committee (ILSAC)
Certification Mark is added to some oil
containers to help you select the oil you
should use.

: The coolant capacity is a reference quantity.

Cooling system

Capacity

RX350h



Gasoline engine

8.7 qt. (8.2 L, 7.2 Imp. qt.)



Power control unit

2.1 qt. (2.0 L, 1.8 Imp. qt.)

RX500h



Gasoline engine

9.9 qt. (9.4 L, 8.3 Imp. qt.)



Intercooler/Power control unit

5.6 qt. (5.3 L, 4.7 Imp. qt.)

Coolant type

Use either of the following:



“Toyota Super Long Life Coolant”



Similar high-quality ethylene glycol-based non-silicate,
non-amine, non-nitrite, and non-borate coolant with
long-life hybrid organic acid technology

Do not use plain water alone.

568

8-1. Specifications

If replacement is necessary, contact your Lexus dealer.

: The fluid capacity is a reference quantity.

If replacement is necessary, contact your Lexus dealer.

Ignition system (spark plug)

Make

RX350h

DENSO FC16HR-Q8

RX500h

NGK DILZKAR8E7H

Gap

RX350h

0.03 in. (0.8 mm)

RX500h

0.03 in. (0.7 mm)

NOTICE

■

Iridium-tipped spark plugs

Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

Electrical system (12-volt battery)

Open voltage at 68°F (20°C):

12.0 V or higher
(Turn the power switch off and turn on the head-
lights for 30 seconds.)

Charging rates:
Slow charge

5 A max.

Transmission

Fluid capacity

RX350h

4.6 qt. (4.4 L, 3.9 Imp. qt.)

RX500h

6.8 qt. (6.4 L, 5.6 Imp. qt.)

Fluid type

Toyota Genuine ATF WS

NOTICE

■

Transmission fluid type

Using transmission fluid other than the above type may cause abnormal noise or vibra-

tion, or ultimately damage the transmission of your vehicle.

569

8-1. Specifications

icle

ific

atio

: The fluid capacity is a reference quantity.

If replacement is necessary, contact your Lexus dealer.

: The fluid capacity is a reference quantity.

If replacement is necessary, contact your Lexus dealer.

: Minimum pedal clearance when depressed with a force of 67.5 lbf (300 N, 30.6 kgf)

Rear differential (rear electric motor) (RX350h)

Fluid capacity

1.8 qt. (1.7 L, 1.5 Imp. qt.)

Fluid type

Toyota Genuine ATF WS

NOTICE

■

Rear differential fluid type

Using differential fluid other than the above type may cause abnormal noise or vibration,

or ultimately damage the differential of your vehicle.

Rear transaxle (rear electric motor) (RX500h)

Fluid capacity

3.2 qt. (3.1 L, 2.7 Imp. qt.)

Fluid type

e-Transaxle Fluid TE

NOTICE

■

Rear transaxle fluid type

Using transaxle fluid other than the above type may cause abnormal noise or vibration, or

ultimately damage the transaxle of your vehicle.

Brakes

Pedal clearance

4.8 in. (122 mm) Min.

Pedal free play

0.04



0.24 in. (1



6 mm)

Brake pad wear limit

0.04 in. (1.0 mm)

Parking brake indicator

When pushing the parking brake switch for 1 to 2
seconds: turns off
When pulling the parking brake switch for 1 to 2
seconds: comes on

Fluid type

FMVSS No. 116 DOT 3 or SAE J1703
FMVSS No. 116 DOT 4 or SAE J1704

Lexus RX350h (2024 year). Manual in english - page 17