Lexus UX250H (2024 year). Manual in english

376

7-2. Steps to take in an emergency

Tighten down the towing eyelet
securely using a hard metal bar.

Securely attach cables or chains to
the towing eyelet.

Take care not to damage the vehicle body.

Enter the vehicle being towed and
start the hybrid system.

If the hybrid system does not start, turn the

power switch to ON.

Shift the shift lever to N and release
the parking brake.

Turn automatic mode off. (



P.175)

When the shift lever cannot be shifted:



P.170

■

While towing

If the hybrid system is off, the power assist

for the brakes and steering will not function,

making steering and braking more difficult.

■

Wheel nut wrench

Wheel nut wrench can be purchased at

your Lexus dealer.

WARNING

Observe the following precautions. Fail-

ure to do so may result in death or seri-

ous injury.

■

While towing

When towing using cables or chains,

avoid sudden starts, etc. which place

excessive stress on the towing eyelet,

cables or chains. The towing eyelet,

cables or chains may become damaged,

broken debris may hit people, and cause

serious damage.

■

Installing towing eyelets to the vehi-

cle

Make sure that towing eyelets are

installed securely.

If not securely installed, towing eyelets

may come loose during towing.

NOTICE

■

To prevent damage to the vehicle

during emergency towing

Do not secure cables or chains to the

suspension components.

377

7-2. Steps to take in an emergency

When trouble

ari

ses



Fluid leaks under the vehicle
(Water dripping from the air condi-
tioning after use is normal.)



Flat-looking tires or uneven tire
wear



Engine coolant temperature gauge
continually points higher than nor-
mal



Changes in exhaust sound



Excessive tire squeal when corner-
ing



Strange noises related to the sus-
pension system



Pinging or other noises related to
the hybrid system



Engine missing, stumbling or run-
ning roughly



Appreciable loss of power



Vehicle pulls heavily to one side
when braking



Vehicle pulls heavily to one side
when driving on a level road



Loss of brake effectiveness, spongy
feeling, pedal almost touches the
floor

If you think something is
wrong

If you notice any of the following
symptoms, your vehicle probably
needs adjustment or repair. Con-
tact your Lexus dealer as soon as
possible.

Visible symptoms

Audible symptoms

Operational symptoms

378

7-2. Steps to take in an emergency

■

Brake system warning light (warning buzzer)

■

Charging system warning light

(warning buzzer)

: This light illuminates on the multi-information display.

■

Low engine oil pressure warning light

(warning buzzer)

: This light illuminates on the multi-information display.

If a warning light turns on or a warning buzzer sounds

Calmly perform the following actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, but then goes off, this does not necessar-
ily indicate a malfunction in the system. However, if this continues to occur,
have the vehicle inspected by your Lexus dealer.

Actions to the warning lights or warning buzzers

Warning light

Details/Actions

(U.S.A.)

(red)

(Canada)

Indicates that:



The brake fluid level is low; or



The brake system is malfunctioning



Immediately stop the vehicle in a safe place and contact your
Lexus dealer. Continuing to drive the vehicle may be dangerous.

Warning light

Details/Actions

Indicates a malfunction in the vehicle’s charging system



Immediately stop the vehicle in a safe place and contact your
Lexus dealer.

Warning light

Details/Actions

Indicates that the engine oil pressure is too low



Immediately stop the vehicle in a safe place and contact your
Lexus dealer.

379

7-2. Steps to take in an emergency

When trouble

ari

ses

■

Malfunction indicator lamp (warning buzzer)

■

High coolant temperature warning light

(warning buzzer)

: This light illuminates on the multi-information display.

■

Tire pressure warning light

■

Brake system warning light (warning buzzer)

Warning light

Details/Actions

(U.S.A.)

(Canada)

Indicates a malfunction in:



The hybrid system;



The electronic engine control system; or



The electronic throttle control system



Immediately stop the vehicle in a safe place and contact your
Lexus dealer.

Warning light

Details/Actions

Indicates that the engine coolant temperature is too high



Immediately stop the vehicle in a safe place.
Handling method (



P.402)

Warning light

Details/Actions

When the light comes on after blinking for approximately 1 minute:
Malfunction in the tire pressure warning system



Have the system checked by your Lexus dealer.

When the light comes on:
Low tire inflation pressure such as



Natural causes



Flat tire



P.385

Warning light

Details/Actions

(yellow)

Indicates a malfunction in:



The regenerative braking system;



The electronically controlled brake system; or



The parking brake system



Have the vehicle inspected by your Lexus dealer immediately.

380

7-2. Steps to take in an emergency

■

SRS warning light (warning buzzer)

■

ABS warning light (warning buzzer)

■

Electric power steering system warning light (warning buzzer)

■

Slip indicator

Warning light

Details/Actions

Indicates a malfunction in:



The SRS airbag system;



The front passenger occupant classification system; or



The seat belt pretensioner system



Have the vehicle inspected by your Lexus dealer immediately.

Warning light

Details/Actions

(U.S.A.)

(Canada)

Indicates a malfunction in:



The ABS; or



The brake assist system



Have the vehicle inspected by your Lexus dealer immediately.

Warning light

Details/Actions

(red)

(yellow)

Indicates a malfunction in the EPS (Electric Power Steering) system



Have the vehicle inspected by your Lexus dealer immediately.

Warning light

Details/Actions

Indicates a malfunction in:



The VSC system;



The TRAC system; or



The hill-start assist control system



Have the vehicle inspected by your Lexus dealer immediately.

381

7-2. Steps to take in an emergency

When trouble

ari

ses

■

Parking brake indicator

■

Brake hold operated indicator (warning buzzer)

■

Intuitive parking assist OFF indicator (warning buzzer)

Warning light

Details/Actions

(flashes)

(U.S.A.)

(flashes)

(Canada)

It is possible that the parking brake is not fully engaged or released.



Operate the parking brake switch once again.

This light comes on when the parking brake is not released. If the light
turns off after the parking brake is fully released, the system is operating
normally.

Warning light

Details/Actions

(flashes)

Indicates a malfunction in the brake hold system



Have the vehicle inspected by your Lexus dealer immediately.

Warning light

Details/Actions

(flashes)

(if equipped)

When a buzzer sounds:
Indicates a malfunction in the intuitive parking assist function



Have the vehicle inspected by your Lexus dealer immediately.

When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.



Follow the instructions displayed on the multi-information display.
(



P.239)

382

7-2. Steps to take in an emergency

■

RCTA OFF indicator (warning buzzer)

■

PKSB OFF indicator (warning buzzer)

■

Low fuel level warning light

■

Driver’s and front passenger’s seat belt reminder light (warning buzzer)

: Driver’s seat belt warning buzzer:

The driver’s seat belt warning buzzer sounds to alert the driver that his or her seat belt is

Warning light

Details/Actions

(flashes)

(if equipped)

When a buzzer sounds:
Indicates a malfunction in the RCTA (Rear Cross Traffic Alert) function



Have the vehicle inspected by your Lexus dealer immediately.

When a buzzer does not sound:
Indicates that the rear bumper around the radar sensor is covered with
dirt, etc. (



P.232)



Follow the instructions displayed on the multi-information display.
(



P.246)

Warning light

Details/Actions

(flashes)

(if equipped)

When a buzzer sounds:
Indicates a malfunction in the PKSB (Parking Support Brake) system



Have the vehicle inspected by your Lexus dealer immediately.

When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.



Follow the instructions displayed on the multi-information display.
(



P.253)

Warning light

Details/Actions

Indicates that remaining fuel is approximately 1.6 gal. (6.0L, 1.3 Imp.gal.)
or less



Refuel the vehicle.

Warning light

Details/Actions

Warns the driver and/or front passenger to fasten their seat belts



Fasten the seat belt.
If the front passenger’s seat is occupied, the front passenger’s seat
belt also needs to be fastened to make the warning light (warning
buzzer) turn off.

383

7-2. Steps to take in an emergency

When trouble

ari

ses

not fastened. Once the power switch is turned to ON, the buzzer sounds. If the seat belt is
still unfastened, the buzzer sounds intermittently for a certain period of time after the vehi-
cle reaches a certain speed.
Front passenger’s seat belt warning buzzer:
The front passenger’s seat belt warning buzzer sounds to alert the front passenger that his
or her seat belt is not fastened. If the seat belt is unfastened, the buzzer sounds intermit-
tently for a certain period of time after the vehicle reaches a certain speed.

■

Rear passengers’ seat belt reminder lights

(warning buzzer)

: This light illuminates on the multi-information display. Regardless of whether or not a

rear passenger is present, if the power switch is turned to ON with the rear seat belts
unfastened, this light will also illuminate for a certain period of time.

: Rear passengers’ seat belt warning buzzer:

The rear passengers’ seat belt warning buzzer sounds to alert the rear passenger that his
or her seat belt is not fastened. If the seat belt is unfastened, the buzzer sounds intermit-
tently for a certain period of time, after the seat belt is fastened and unfastened and the
vehicle reaches a certain speed.

■

Inappropriate pedal operation warning light

(warning buzzer)

: This light illuminates on the multi-information display.

Warning light

Details/Actions

Warns the rear passengers to fasten their seat belts



Fasten the seat belt.

Warning light

Details/Actions

When a buzzer sounds:



Brake Override System is malfunctioning



Drive-Start Control is malfunctioning



Drive-Start Control is operating



PKSB (Parking Support Brake) (if equipped) is operating



Follow the instructions displayed on the multi-information display
and head-up display (if equipped).

When a buzzer does not sound:
Brake Override System is operating



Release the accelerator pedal and depress the brake pedal.

384

7-2. Steps to take in an emergency

■

LTA indicator

(warning buzzer)

: This light illuminates on the multi-information display.

■

PCS warning light (warning buzzer)

■

Hybrid system overheat warning light

(warning buzzer)

: This light illuminates on the multi-information display.

■

Low traction battery charge warning light

(warning buzzer)

: This light illuminates on the multi-information display.

Warning light

Details/Actions

(orange)

Indicates a malfunction in the LTA (Lane Tracing Assist)



Follow the instructions displayed on the multi-information display.
(



P.218)

Warning light

Details/Actions

(flashes or illumi-

nates)

When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-Collision System)



Have the vehicle inspected by your Lexus dealer immediately.

When a buzzer does not sound:
The PCS (Pre-Collision System) has become temporarily unavailable,
corrective action may be necessary.



Follow the instructions displayed on the multi-information display.
(



P.198, 387)

If the PCS (Pre-Collision System) or VSC (Vehicle Stability Control)
system is disabled, the PCS warning light will illuminate.



P.209

Warning light

Details/Actions

Indicates the hybrid system has overheated
This light may be displayed when driving under severe operating condi-
tions. (For example, when driving up a long steep hill.)



Stop the vehicle in a safe place.
Handling method (



P.402)

Warning light

Details/Actions

(orange)

Indicates that the hybrid battery (traction battery) is low



Restart the hybrid system when starting the vehicle.

385

7-2. Steps to take in an emergency

n t

ris

■

Warning buzzer

In some cases, the buzzer may not be heard

due to being in a noisy location or audio

sound.

■

Front passenger detection sensor, seat

belt reminder and warning buzzer

●

If luggage is placed on the front passen-

ger seat, the front passenger detection

sensor may cause the warning light to

flash and the warning buzzer to sound

even if a passenger is not sitting in the

seat.

●

If a cushion is placed on the seat, the sen-

sor may not detect a passenger, and the

warning light may not operate properly.

■

SRS warning light

This warning light system monitors the air-

bag sensor assembly, front impact sensors,

side impact sensors (front door), side

impact sensors (front), side impact sensors

(rear), driver’s seat position sensor, driver’s

seat belt buckle switch, front passenger

occupant classification system (ECU and

sensors), rear seat belt buckle switches (if

equipped), “AIR BAG ON” indicator light,

“AIR BAG OFF” indicator light, front pas-

senger’s seat belt buckle switch, seat belt

pretensioners, airbags, interconnecting wir-

ing and power sources. (



P.31)

■

Electric power steering system warning

light (warning buzzer)

When the 12-volt battery charge becomes

insufficient or the voltage temporarily

drops, the electric power steering system

warning light may come on and the warning

buzzer may sound.

■

When the tire pressure warning light

comes on

Inspect the tires to check if a tire is punc-

tured.
If a tire is punctured:



P.392

If none of the tires are punctured:

Turn the power switch off then turn it to

ON. Check if the tire pressure warning

light comes on or blinks.



If the tire pressure warning light blinks for

approximately 1 minute then stays on

There may be a malfunction in the tire pres-

sure warning system. Have the vehicle

inspected by your Lexus dealer immedi-

ately.



If the tire pressure warning light comes

After the temperature of the tires has

lowered sufficiently, check the inflation

pressure of each tire and adjust them to

the specified level.

If the warning light does not turn off

even after several minutes have

elapsed, check that the inflation pres-

sure of each tire is at the specified level

and perform initialization. (



P.344)

■

The tire pressure warning light may

come on due to natural causes

The tire pressure warning light may come

on due to natural causes such as natural air

leaks and tire inflation pressure changes

caused by temperature. In this case, adjust-

ing the tire inflation pressure will turn off the

warning light (after a few minutes).

■

Conditions that the tire pressure warn-

ing system may not function properly



P.342

WARNING

■

If a warning light comes on or a warn-

ing buzzer sounds when a warning

message is shown on the multi-infor-

mation display

Check and follow the message shown on

the multi-information display. Failure to

do so may result in death or serious

injury.

■

If both the ABS and the brake system

warning lights remain on

Stop your vehicle in a safe place immedi-

ately and contact your Lexus dealer.

The vehicle will become extremely

unstable during braking, and the ABS

system may fail, which could cause an

accident resulting in death or serious

injury.

386

7-2. Steps to take in an emergency

WARNING

■

When the electric power steering

system warning light comes on

When the light comes on yellow, the

assist to the power steering is restricted.

When the light comes on red, the assist

to the power steering is lost and handling

operations of the steering wheel become

extremely heavy.

When steering wheel operations are

heavier than usual, grip the steering

wheel firmly and operate it using more

force than usual.

■

If the tire pressure warning light

comes on

Be sure to observe the following precau-

tions.

Failure to do so could cause a loss of

vehicle control and result in death or

serious injury.

●

Decelerate to the lowest appropriate

speed as soon as possible. Do not

drive over 50 mph (80 km/h).

●

Check and adjust the tire inflation

pressure immediately.

●

If the tire pressure warning light comes

on even after tire inflation pressure

adjustment, it is probable that you have

a flat tire. Have the flat tire replaced by

the nearest Lexus dealer.

●

Avoid abrupt maneuvering and brak-

ing.

If the vehicle tires deteriorate, you

could lose control of the steering

wheel or the brakes.

■

If a blowout or sudden air leakage

should occur

The tire pressure warning system may

not activate immediately.

■

Maintenance of the tires

Each tire, including the spare (if pro-

vided), should be checked monthly when

cold and inflated to the inflation pressure

recommended by the vehicle manufac-

turer on the vehicle placard or tire infla-

tion pressure label (tire and load

information label). (If your vehicle has

tires of a different size than the size indi-

cated on the vehicle placard or tire infla-

tion pressure label [tire and load

information label], you should determine

the proper tire inflation pressure for

those tires.)

As an added safety feature, your vehicle

has been equipped with a tire pressure

monitoring system (TPMS-tire pressure

warning system) that illuminates a low

tire pressure telltale (tire pressure warn-

ing light) when one or more of your tires

is significantly under-inflated. Accord-

ingly, when the low tire pressure telltale

(tire pressure warning light) illuminates,

you should stop and check your tires as

soon as possible, and inflate them to the

proper pressure. Driving on a signifi-

cantly under-inflated tire causes the tire

to overheat and can lead to tire failure.

Under-inflation also reduces fuel effi-

ciency and tire tread life, and may affect

the vehicle’s handling and stopping abil-

ity.

Please note that the TPMS (tire pressure

warning system) is not a substitute for

proper tire maintenance, and it is the

driver’s responsibility to maintain correct

tire pressure, even if under-inflation has

not reached the level to trigger illumina-

tion of the TPMS low tire pressure telltale

(tire pressure warning light).

387

7-2. Steps to take in an emergency

n t

ris

WARNING

Your vehicle has also been equipped

with a TPMS (tire pressure warning sys-

tem) malfunction indicator to indicate

when the system is not operating prop-

erly. The TPMS (tire pressure warning

system) malfunction indicator is com-

bined with the low tire pressure telltale

(tire pressure warning light). When the

system detects a malfunction, the telltale

will flash for approximately one minute

and then remain continuously illumi-

nated. This sequence will continue upon

subsequent vehicle start-ups as long as

the malfunction exists. When the mal-

function indicator is illuminated, the sys-

tem may not be able to detect or signal

low tire pressure as intended.

TPMS (tire pressure warning system)

malfunctions may occur for a variety of

reasons, including the installation of

replacement or alternate tires or wheels

on the vehicle that prevent the TPMS

(tire pressure warning system) from

functioning properly. Always check the

TPMS (tire pressure warning system)

malfunction telltale after replacing one

or more tires or wheels on your vehicle

to ensure that the replacement or alter-

nate tires and wheels allow the TPMS

(tire pressure warning system) to con-

tinue to function properly.

NOTICE

■

To ensure the tire pressure warning

system operates properly

Do not install tires with different specifi-

cations or makers, as the tire pressure

warning system may not operate prop-

erly.

If a warning message is dis-
played

The multi-information display
shows warnings of system malfunc-
tions, incorrectly performed opera-
tions, and messages that indicate a
need for maintenance. When a
message is shown, perform the cor-
rection procedure appropriate to
the message.

Multi-information display

Follow the instructions of the message
on the multi-information display.
If any of the warning messages are
shown again after the following actions
have been performed, contact your
Lexus dealer.

388

7-2. Steps to take in an emergency

The warning lights and warning buzzers operate as follows depending on the con-
tent of the message. If a message indicates the need for inspection by a dealer,
have the vehicle inspected by your Lexus dealer immediately.

: A buzzer sounds the first time a message is shown on the multi-information display.

■

Warning messages

The warning messages explained below

may differ from the actual messages

according to operation conditions and vehi-

cle specifications.

■

Warning buzzer

In some cases, the buzzer may not be heard

due to being in a noisy location or audio

sound.

■

If a message about an operation is

shown

●

If a message about an operation of the

accelerator pedal or brake pedal is

shown

• A warning message about an operation

of the brake pedal may be shown while

the driving assist systems such as PCS

(Pre-Collision system) or the dynamic

radar cruise control with full-speed range

is operating.

If a warning message is shown, be sure to

decelerate the vehicle or follow an

instruction shown on the multi-informa-

tion display.

• A warning message is shown when Brake

Override System operates. (



P.152)

• A warning message is shown when

Drive-Start Control or Parking Support

Brake (if equipped) (



P.157, 249)

operates. Follow the instructions on the

multi-information display.

●

If a message about an operation of the

power switch is shown

An instruction for operation of the power
switch is shown when the incorrect proce-
dure for starting the hybrid system is per-
formed or the power switch is operated
incorrectly.
Follow the instructions shown on the multi-
information display to operate the power

Messages and warnings

Warning light

Warning buzzer

Warning



Sounds

• Indicates an important situation, such as when a

system related to driving is malfunctioning or
that danger may result if the correction proce-
dure is not performed

• Indicates a situation, such as when damage to

the vehicle or danger may result

Comes on

or flashes

Sounds

Indicates an important situation, such as when the
systems shown on the multi-information display
may be malfunctioning



Does not sound

• Indicates a condition, such as malfunction of

electrical components, their condition, or indi-
cates the need for maintenance

• Indicates a situation, such as when an operation

has been performed incorrectly, or indicates
how to perform an operation correctly

389

7-2. Steps to take in an emergency

When trouble

ari

ses

switch again.

●

If a message about a shift lever operation

is shown

To prevent the shift lever from being oper-
ated incorrectly or the vehicle from moving
unexpectedly, a message that requires
shifting the shift lever may be shown on the
multi-information display.
In that case, follow the instruction of the
message and shift the shift lever.

●

If a message or image about an

open/close state of a part or replenish-

ment of a consumable is shown

Confirm the part indicated by the multi-
information display or a warning light, and
then perform the coping method such as
closing the open door or replenishing a
consumable.

■

If “Engine Oil Level Low Add or

Replace” is displayed

The engine oil level is low. Check the level

of the engine oil, and add if necessary

(



P.332).

This message may appear if the vehicle is

stopped on a slope. Move the vehicle to a

level surface and check to see if the mes-

sage disappears.

■

If “Hybrid System Stopped Steering

Power Low” is displayed

This message is displayed if the hybrid sys-

tem is stopped while driving.
When steering wheel operations are

heavier than usual, grip the steering wheel

firmly and operate it using more force than

usual.

■

If “Hybrid system overheated Output

power reduced” is displayed

This message may be displayed when driv-

ing under severe operating conditions. (For

example, when driving up a long steep hill.)

Handling method:



P.402

■

If “Traction Battery Needs to be Pro-

tected Refrain From the Use of N Posi-

tion” is displayed

This message may be displayed when the

shift lever is in N.
As the hybrid battery (traction battery) can-

not be charged when the shift lever is in N,

shift the shift lever to P when the vehicle is

stopped.

■

If “Traction Battery Needs to be Pro-

tected Shift into P to Restart” is dis-

played

This message is displayed when the hybrid

battery (traction battery) charge has

become extremely low because the shift

lever has been left in N for a certain amount

of time.
When operating the vehicle, shift to P and

restart the hybrid system.

■

If “Shift to P Before Exiting Vehicle” is

shown

This message is displayed when the driver’s

door is opened without turning the power

switch off with the shift lever in any position

other than P.
Shift the shift lever to P.

■

If “Shift is in N Release accelerator

before shifting” is displayed

The accelerator pedal has been depressed

when the shift lever is in N.
Release the accelerator pedal and shift the

shift lever to D, S or R.

■

If “Press brake when vehicle is stopped

Hybrid system may overheat” is dis-

played

The message may be displayed when the

accelerator pedal is depressed to hold the

vehicle while the vehicle is stopped on an

incline, etc. The hybrid system may over-

heat. Release the accelerator pedal and

depress the brake pedal.

■

If “Auto Power Off to Conserve Bat-

tery” is displayed

Power was turned off due to the automatic

power off function. Next time when starting

the hybrid system, operate the hybrid sys-

tem for approximately 5 minutes to

recharge the 12-volt battery.

390

7-2. Steps to take in an emergency

■

If “High Power Consumption Power to

Climate Temporarily Limited” is dis-

played

Turn off unnecessary electronic equipment

to reduce power consumption.
Please wait until the power supply returns

to normal.

■

If “Radar Cruise Control Unavailable

See Owner’s Manual” is shown

The dynamic radar cruise control with full-

speed range system is suspended tempo-

rarily or until the problem shown in the mes-

sage is resolved. (causes and coping

methods:



P.198)

■

If “Radar Cruise Control Unavailable” is

shown

The dynamic radar cruise control with full-

speed range system cannot be used tempo-

rarily. Use the system when it becomes

available again.

■

If a message that indicates the malfunc-

tion of front camera is displayed

The following systems may be suspended

until the problem shown in the message is

resolved. (



P.198, 378)

●

PCS (Pre-Collision System)

●

LTA (Lane Tracing Assist)

●

AHB (Automatic High Beam)

●

RSA (Road Sign Assist) (if equipped)

●

Dynamic radar cruise control with full-

speed range

■

If a message that indicates the malfunc-

tion of radar sensor is displayed

The following systems may be suspended

until the problem shown in the message is

resolved. (



P.198, 378)

●

PCS (Pre-Collision System)

●

LTA (Lane Tracing Assist)

●

Dynamic radar cruise control with full-

speed range

■

If “AWD System Overheated Switching

to 2WD Mode” or “AWD System

Overheated 2WD Mode Engaged” is

shown on the multi-information display

(AWD models)

This message may be displayed when high

load driving is continued. (



P.263)

■

If “Maintenance Required Soon” is dis-

played

Indicates that all maintenance according to

the driven distance on the maintenance
schedule

should be performed soon.

Comes on approximately 4500 miles

(7200 km) after the message has been

reset. If necessary, perform maintenance.

Please reset the message after the mainte-

nance is performed. (



P.322)

: Refer to the separate “Scheduled Main-

tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.

■

If “Maintenance Required Visit Your

Dealer” is displayed

Indicates that all maintenance is required to

correspond to the driven distance on the
maintenance schedule

Comes on approximately 5000 miles

(8000 km) after the message has been

reset. (The indicator will not work properly

unless the message has been reset.) Per-

form the necessary maintenance. Please

reset the message after the maintenance is

performed. (



P.322)

: Refer to the separate “Scheduled Main-

tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.

■

If “Oil Maintenance Required Soon” is

displayed

Indicates that the engine oil should be

scheduled to be changed.
Check the engine oil and change it if neces-

sary. After changing the engine oil, make

sure to reset the message. (



P.333)

391

7-2. Steps to take in an emergency

n t

ris

■

If “Oil Maintenance Required” is dis-

played

Indicates that the engine oil should be

changed.
Check and change the engine oil, and oil fil-

ter by your Lexus dealer. After changing

the engine oil, make sure to reset the mes-

sage. (



P.333)

■

If a message that indicates the need for

visiting your Lexus dealer is displayed

The system or part shown on the multi-

information display is malfunctioning. Have

the vehicle inspected by your Lexus dealer

immediately.

■

If a message that indicates the need for

referring to Owner’s Manual is dis-

played

●

If any of the following messages are

shown on the multi-information display,

follow the instructions.

• “Engine Coolant Temp High” (



P.402)

• “Front Camera Unavailable” (



P.198)

●

If any of the following messages are

shown on the multi-information display, it

may indicate a malfunction. Have the

vehicle inspected by your Lexus dealer

immediately.

• “Access System with Elec. Key Malfunc-

tion”

• “Hybrid system malfunction”

• “Check Engine”

• “Hybrid battery system malfunction”

• “Accelerator system malfunction”

●

If any of the following messages are

shown on the multi-information display, it

may indicate a malfunction. Immediately

stop the vehicle and contact your Lexus

dealer.

• “Braking Power Low”

• “Charging System Malfunction”

• “Oil Pressure Low”

●

If any of the following messages are

shown on the multi-information display,

the vehicle may have run out of fuel. Stop

the vehicle in a safe place and, if the fuel

level is low, refuel the vehicle. (



P.65)

• “Hybrid system stopped”

• “Engine stopped”

●

If “Low Auxiliary Battery See Owner’s

Manual” is shown

• When the display goes off after several

seconds

Maintain the hybrid system operation for
more than 15 minutes and charge the 12-
volt battery.
• When the display does not go off:
Start up the hybrid system using the proce-
dures for “If the 12-volt battery is dis-
charged” (



P.398)

: Displays for about 6 seconds

●

If “Maintenance required for Traction

battery cooling parts See owner’s man-

ual” is shown, the filter may be clogged,

the air intake vent may be blocked, or

there may be a gap in the duct. There-

fore, perform the following correction

procedure.

• Cleaning the hybrid battery (traction bat-

tery) air intake vent (



P.356)

If the warning message is shown even if

the vent is cleaned, have the vehicle

inspected by your Lexus dealer.

NOTICE

■

If “High Power Consumption Power

to Climate Temporarily Limited” is

displayed frequently

There is a possible malfunction relating

to the charging system or the 12-volt bat-

tery may be deteriorating. Have the vehi-

cle inspected by your Lexus dealer.

■

If “Low Auxiliary Battery” is displayed

frequently

The 12-volt battery may have deterio-

rated. As the battery may discharge in

this state when left unattended, have the

battery inspected by your Lexus dealer.

392

7-2. Steps to take in an emergency

Take your vehicle to the nearest Lexus
dealer or authorized tire dealer as
soon as possible if any tire goes flat.

The vehicle can be driven for a maximum
of 100 miles (160 km) at a speed below 50
mph (80 km/h) after the tire pressure
warning light comes on. (



P.379)

A run-flat tire has a

mark on the

side wall.

■

In some condition (such as at high tem-

peratures)

You cannot continue driving for up to 100

miles (160 km).

■

For the detailed information on run-flat

tires



P.341

If you have a flat tire

Your vehicle is not equipped with a
spare tire, but instead you can con-
tinue driving the vehicle with run-
flat tires even if any tire goes flat.
In this case, slow down and drive
with extra caution.

Run-flat tires

NOTICE

■

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.

■

When driving over bumps

If a vehicle has a flat tire, the vehicle

height will be lower than usual. Ensure

that nothing strikes the bottom of the

vehicle.

■

To avoid damaging the tire pressure

warning valves and transmitters

When a tire is repaired with liquid seal-

ants, the tire pressure warning valve and

transmitter may not operate properly. If a

liquid sealant is used, contact your Lexus

dealer or other qualified service shop as

soon as possible. Make sure to replace

the tire pressure warning valve and

transmitter when replacing the tire.

(



P.343)

393

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.396)



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



P.65)



There may be a malfunction in the
immobilizer system. (



P.68)



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.

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



The 12-volt battery may be dis-

charged. (



P.398)



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



P.337)

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



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



P.398)



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



P.337)

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

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



P.174)

Parking brake indicator will come on.

Shift the shift lever to P.

Turn the power switch to ACC.

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.163)

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

395

7-2. Steps to take in an emergency

n t

ris

Remove the cover inside the lug-
gage compartment by inserting a
screwdriver.

When removing the cover, to prevent

damage, cover the tip of the screwdriver

with a rag.

Pull the lever.

If the fuel filler door cannot
be opened

If the fuel filler door opener switch
cannot be operated, contact your
Lexus dealer to service the vehicle.
In case where refueling is urgently
necessary, the following proce-
dure can be used to open the fuel
filler door.

Opening the fuel filler door

NOTICE

■

When opening the fuel filler door

manually

●

Do not open the fuel filler door manu-

ally except in an emergency. Fuel may

overflow.

●

Using the lever to open the fuel filler

door may not allow for an adequate

reduction in fuel tank pressure before

refueling. To prevent fuel from spilling

out, turn the cap slowly when remov-

ing it.

●

During refueling, fuel may spill out

from the filler opening due to air being

discharged from inside the fuel tank.

Therefore, fill the fuel tank carefully

and slowly.

396

7-2. Steps to take in an emergency

■

When the electronic key does not work

properly

●

Make sure that the smart access system

with push-button start has not been deac-

tivated in the customization setting. If it is

off, turn the function on.

(Customizable features:



P.429)

●

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

set, cancel the function. (



P.128)

●

The electronic key function may have

stopped. (



P.128)

■

Unlocking the door

Use the mechanical key (



P.106) to

perform the following operations.

Insert the mechanical key while
pulling on the driver’s door handle.

Unlock the door.

Remove the key, return the handle,
and then pull the handle again.

■

Locking the door

With the door open, push down the
inside lock button.

Close the door.

■

Key linked functions

The opening and closing of the power win-

dows and moon roof (if equipped) can be

linked to key operation by a customized

If the electronic key does not
operate properly

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



P.128) 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, includ-

ing the card key, to your Lexus dealer.

Locking and unlocking the doors

397

7-2. Steps to take in an emergency

n t

ris

setting.

Closes the windows and moon roof
(turn and hold)

Opens the windows and moon roof
(turn and hold)

Ensure that the shift lever 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 sounds and the power switch will

turn to ON.

When the smart access system with push-

button start is deactivated in customization

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.

In the event that the hybrid system still can-

not be started, contact your Lexus dealer.

■

Stopping the hybrid system

Set the parking brake, shift the shift lever to

P and press the power switch as you nor-

mally do when stopping the hybrid system.

■

Electronic 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.359)

■

Alarm (for Canada)

Using the mechanical key to lock the doors

will not set the alarm system.
If a door is unlocked using the mechanical

key when the alarm system is set, the alarm

may be triggered. (



P.69)

■

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.166)

WARNING

■

When using the mechanical key and

operating the power windows or

moon roof (if equipped)

Operate the power window or 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 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 moon roof.

Starting the hybrid system

398

7-2. Steps to take in an emergency

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.70)

Open the hood (



P.329) and

fuse box cover.

Push the tab in and lift the lid off.

Open the exclusive jump starting
terminal cover.

Remove the engine cover.

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

399

7-2. Steps to take in an emergency

When trouble

ari

ses

Connect a positive jumper cable clamp to

on your vehicle and connect the

clamp on the other end of the positive cable to

on the second vehicle. Then,

connect a negative cable clamp to

on the second vehicle and connect the

clamp at the other end of the negative cable to

Use jumper cables that can reach the specified terminals and connecting point.

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.

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 posi-
tion.

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

■

Starting the hybrid system when the 12-

volt battery is discharged

The hybrid system cannot be started by

A
B
C
D

400

7-2. Steps to take in an emergency

push-starting.

■

To prevent 12-volt battery discharge

●

Turn off the headlights, the air condition-

ing system, the audio system, etc. 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.

■

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 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.

●

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.

●

The power back door (if equipped) must

be initialized. (



P.121)

■

When replacing the 12-volt battery

●

Use a Central Degassing type 12-volt

battery (European Regulations).

●

Use a 12-volt battery that the case size is

same as the previous one (LN1), 20 hour

rate capacity (20HR) is equivalent

(45Ah) or greater, and performance rat-

ing (CCA) is equivalent (285A) or

greater.

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

not be properly secured.

• If an improper 12-volt battery is used, bat-

tery performance may decrease and the

hybrid system may not be able to restart.

• 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 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 exchanging, firmly attach the fol-

lowing items to the exhaust hole of the

12-volt battery.

• Confirm that the elbow is securely

attached to the exhaust hose and exhaust

hole.

• Confirm that the exhaust hole plug is

securely attached to the exhaust hole that

the elbow is not attached to.

• Use the elbow/exhaust hole plug

included with the 12-volt battery

exchanged or the one installed on the

battery prior to the exchange. (Depend-

ing on the 12-volt battery to be

exchanged, the exhaust hole may be

plugged.)

401

7-2. Steps to take in an emergency

n t

ris

Exhaust hole

Exhaust hole plug

Exhaust hose

Elbow

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.

●

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 (acid)

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 han-

dling the 12-volt battery and other bat-

tery-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.

402

7-2. Steps to take in an emergency



If the engine coolant temperature
gauge enters the red zone or
“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

WARNING

■

When replacing the 12-volt battery

●

When the vent plug is close to the hold

down clamp, the battery fluid (acid)

may leak.

●

For information regarding battery

replacement, contact your Lexus

dealer.

●

After exchanging, securely attach the

elbow connected to the exhaust hose,

and exhaust hole plug to the exhaust

hole of the exchanged 12-volt battery.

If not properly installed, gases (hydro-

gen) may leak into the vehicle interior,

and there is the possible danger of the

gas igniting and exploding.

NOTICE

■

When handling jumper cables

When connecting the jumper cables,

ensure that they do not become entan-

gled in the cooling fans 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.

If your vehicle overheats

The following may indicate that
your vehicle is overheating.



The engine coolant temperature
gauge (



P.79, 83) enters the

red zone, or a loss of hybrid sys-
tem 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 over-
heated Output power reduced” is
shown on the multi-information
display.



Steam comes out from under the
hood.

Correction procedures

403

7-2. Steps to take in an emergency

When trouble

ari

ses

and radiator core (radiator) for any
leaks.

Radiator

Cooling fans

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

The coolant level is satisfactory if it
is between the “MAX” and “MIN”
lines on the reservoir.

Reservoir

“MAX” line

“MIN” line

Add coolant if necessary.

Water can be used in an emergency if

coolant is unavailable.

Start the hybrid system and turn the
air conditioning system on to check
that the radiator cooling fans oper-
ate and to check for coolant leaks
from the radiator or hoses.

The fans operate when the air conditioning

system is turned on immediately after a

cold start. Confirm that the fans are oper-

ating by checking the fan sound and air

flow. If it is difficult to check these, turn the

air conditioning system on and off repeat-

edly.

(The fans may not operate in freezing tem-

peratures.)

If the fans are not operating:
Stop the hybrid system immediately
and contact your Lexus dealer.
If the fans are 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.

A
B

A
B
C

404

7-2. Steps to take in an emergency



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.

Radiator

Cooling fans

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

The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir.

Reservoir

“F” line

“L” line

Add coolant if necessary.

Water can be used in an emergency if

coolant is unavailable.
If water has been added in an emergency,

have the vehicle inspected by your Lexus

dealer as soon as possible.

After stopping the hybrid system
and waiting for 5 minutes or more,
start the hybrid system again and
check if “Hybrid system over-
heated Output power reduced” is
shown on the multi-information dis-
play.

If the message does not disappear:

Stop the hybrid system and contact your

Lexus dealer.
If the message is not displayed:

The hybrid system temperature has

dropped and the vehicle may be driven

normally.
However, if the message appears again

frequently, contact your Lexus dealer.

WARNING

■

To prevent an accident or injury 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.

405

7-2. Steps to take in an emergency

n t

ris

Stop the hybrid system. Shift the
shift lever to P and set the parking
brake.

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 lever 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 the

switch to turn off TRAC.

(



P.261)

WARNING

●

After the hybrid system has been

turned off, check that the “READY”

indicator is off. When the hybrid sys-

tem 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 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 coolant reservoir

cap while the hybrid system and radia-

tor 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

system

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 procedures
if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:

Recovering procedure

406

7-2. Steps to take in an emergency

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 lever

Be careful not to shift the shift lever 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 hybrid trans-

mission and other components

●

Avoid spinning the tires and depress-

ing 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.

Lexus UX250H (2024 year). Manual in english - page 12