Lexus UX250h (2023 year). Manual in english — page 24

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.

1

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

2

Unlock the door.

3

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

■

Locking the door

1

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

2

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

7

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setting.

1

Closes the windows and moon roof
(turn and hold)

2

Opens the windows and moon roof
(turn and hold)

1

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

2

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.

3

Firmly depress the brake pedal and
check that

is shown on the

multi-information display.

4

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

3

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.

1

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)

2

Open the hood (



P.329) and

fuse box cover.

Push the tab in and lift the lid off.

3

Open the exclusive jump starting
terminal cover.

4

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

7

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5

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

.

Exclusive jump starting terminal (your vehicle)

Positive (+) battery terminal (second vehicle)

Negative (-) battery terminal (second vehicle)

Solid, stationary, unpainted metallic point away from the exclusive jump starting
terminal and any moving parts as shown in the illustration

6

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.

7

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

8

Make sure the “READY” indicator
comes on. If the indicator light does
not come on, contact your Lexus
dealer.

9

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

10

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

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

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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.

A

B

C

D

●

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

1

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

2

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

3

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.

■

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

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and radiator core (radiator) for any
leaks.

Radiator

Cooling fans

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

4

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

Reservoir

“MAX” line

“MIN” line

5

Add coolant if necessary.

Water can be used in an emergency if

coolant is unavailable.

6

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.)

7

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.

8

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

1

Stop the vehicle in a safe place.

2

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

3

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.

4

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

Reservoir

“F” line

“L” line

5

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.

6

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.

A
B

A
B
C

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

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1

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

2

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

3

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

4

Restart the hybrid system.

5

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.

407

8

8

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Vehicle specifications

8-1. Specifications

Maintenance data (fuel, oil level,

etc.) . . . . . . . . . . . ..

408

Fuel information. . . . . . ..

415

Tire information. . . . . . ...

417

8-2. Customization

Customizable features. . .

426

8-3. Initialization

Items to initialize . . . . . .

438

408

8-1. Specifications

8-1.Specifications

*1

: Unladen vehicle

*2

: Vehicles without shark fin antenna

*3

: Vehicles with shark fin antenna

■

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 on the top left of the
instrument panel.

This number is also on the Certification
Label.

Maintenance data (fuel, oil level, etc.)

Dimensions and weight

Overall length

177.0 in. (4495 mm)

Overall width

72.4 in. (1840 mm)

Overall height

*1

59.8 in. (1520 mm)

*2

60.6 in. (1540 mm)

*3

Wheelbase

103.9 in. (2640 mm)

Tread

Front

61.0 in. (1550 mm)

Rear

61.0 in. (1550 mm)

Vehicle capacity weight
(Occupants + luggage)

890 lb. (405 kg)

Seating capacity

Seating capacity

5 (Front 2, Rear 3)

Vehicle identification

409

8-1. Specifications

8

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s

This number is also stamped under the
right-hand front seat.

■

Engine number

The engine number is stamped on the
engine block as shown.

Engine

Model

2.0 L 4-cylinder (M20A-FXS)

Type

4-cylinder in line, 4-cycle, gasoline

Bore and stroke

3.17



3.84 in. (80.5



97.6 mm)

Displacement

121.3 cu.in. (1987 cm

3

)

Valve clearance

Automatic adjustment

Drive belt tension

Automatic adjustment

Fuel

Fuel type

Unleaded gasoline only

Octane Rating

87 (Research Octane Number 91) or higher

Fuel tank capacity (Reference)

10.6 gal. (40 L, 8.8 Imp.gal.)

410

8-1. Specifications



Front



Rear (AWD models)

■

Oil capacity (Drain and refill [Ref-
erence

*

])

*

: The engine oil capacity is a reference

quantity to be used when changing the
engine oil. Warm up the engine and turn
off the hybrid system, wait more than 5
minutes, and check the oil level on the
dipstick.

■

Engine oil selection

“Toyota Genuine Motor Oil” is used in
your Lexus vehicle. Use Lexus

approved “Toyota Genuine Motor
Oil” or equivalent to satisfy the follow-
ing 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

Electric motor (traction motor)

Type

Permanent magnet synchronous motor

Maximum output

80 kW

Maximum torque

149.0 ft•lbf (202 N•m, 20.6 kgf•m)

Type

Induction asynchronous motor

Maximum output

5.3 kW

Maximum torque

40.6 ft•lbf (55 N•m, 5.6 kgf•m)

Hybrid battery (traction battery)

Type

Nickel-Metal hydride battery

Voltage

7.2 V/module

Capacity

6.5 Ah

Quantity

30 modules

Nominal voltage

216 V

Lubrication system

With filter

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

Without filter 4.1 qt. (3.9 L, 3.4 Imp.qt.)

411

8-1. Specifications

8

Vehic

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at

ion
s

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 mark is added to some
oil containers to help you select the oil
you should use.

*

: The coolant capacity is a reference quantity.

If replacement is necessary, contact your Lexus dealer.

A

Cooling system

Capacity

*

Gasoline
engine

6.3 qt. (6.0 L, 5.3 Imp.qt.)

Power con-
trol unit

1.8 qt. (1.7 L, 1.5 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 tech-
nology

Do not use plain water alone.