Lexus NX250 (2024 year). Manual in english

Cruise control indicator (warning buzzer)

Condition

Cause / Remedy

(Yellow)

Indicates a malfunction in the cruise control system.

●

Follow the instructions displayed on the display.

PDA indicator (warning buzzer)

Condition

Cause / Remedy

(Yellow)

Indicates a malfunction in the PDA (Proactive Driving Assist)
Follow the instructions displayed on the display.

Driving assist information indicator

Condition

Cause / Remedy

Indicates one of the following systems is malfunctioning.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

Follow the instructions displayed on the display.

Indicates one of the following systems is malfunctioning or disabled.

●

PKSB (Parking Support Brake)

●

RCD (Rear Camera Detection)

●

BSM (Blind Spot Monitor)

●

RCTA(Rear Cross Traffic Alert)

●

Safe Exit Assist

●

Follow the instructions displayed on the display.

* :

If equipped

9-2. If a warning is indicated on the meter

568

Slip indicator

Condition

Cause / Remedy

(illuminates)

Indicates a malfunction in:

●

The VSC system;

●

The Trailer Sway Control system;

●

The TRAC system;

●

The Trail Mode function

; or

●

The hill-start assist control system

Have the vehicle checked by your Lexus dealer immediately.

Parking brake indicator

Condition

Cause / Remedy

(U.S.A.) (flashes)

(Canada) (flashes)

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.

Indicates a malfunction in the parking brake system
Have the vehicle checked by your Lexus dealer immediately.

Brake hold operated indicator (warning buzzer)

Condition

Cause / Remedy

(flashes)

Indicates a malfunction in the brake hold system
Have the vehicle checked by your Lexus dealer immediately.

* :

If equipped

9-2. If a warning is indicated on the meter

569

When tr

ouble arises

If a warning message is displayed

The multi-information display shows warnings for system malfunctions and incor-
rectly performed operations, and messages that indicate a need for maintenance.
When a message is displayed, perform the appropriate corrective action for the
message.
If a warning message is displayed again after the appropriate actions have been
performed, contact your Lexus dealer.
Additionally, if a warning light comes on or flashes at the same time that a warning
message is displayed, take the appropriate corrective action for the warning light.

INFORMATION

■

Warning messages

The warning messages explained below may differ from the actual messages according
to operation conditions and vehicle specifications.

■

Warning buzzer

In some cases, the buzzer may not be heard due to being in a noisy location or audio
sound.

"Engine Oil Level Low Add or Replace"

Cause

Remedy

The engine oil
level may be
low.

Check the level of the engine oil, and add engine oil if necessa-
ry.
This message may be displayed if the vehicle is stopped on
a slope. Move the vehicle to a level surface and check if the
message disappears.

Related Links

Checking and adding the engine oil(P. 512)

"Engine Stopped Steering Power Low"

Cause

Remedy

This message is displayed if
the engine 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.

9-2. If a warning is indicated on the meter

570

"Auto Power OFF to Conserve Battery"

Cause

Remedy

Power was turned off due
to the automatic power off
function.

Next time when starting the engine, increase the
engine speed slightly and maintain that level for
approximately 5 minutes to recharge the battery.

Related Links

Changing the engine switch mode(P. 131)

"12-Volt Battery Charging System Malfunction Stop in a Safe Place See
Owner's Manual"

Cause

Remedy

It may indicate a mal-
function.

Immediately stop the vehicle and contact your Lexus
dealer. Continuing to drive the vehicle may be danger-
ous.

"Tire Set Switching Incomplete Try Tire Set Registration Again See
Owner's Manual"

Cause

Remedy

The wheel set change
could not be completed.

Check which wheel set is installed and perform the
change procedure again from the beginning.

Related Links

Selecting wheel set(P. 541)

"Headlight System Malfunction Visit Your Dealer"

Cause

Remedy

The system may be malfunction-
ing.

Have the vehicle checked by your Lexus
dealer.

9-2. If a warning is indicated on the meter

571

When tr

ouble arises

"AWD System Overheated Switching to 2WD Mode"

Cause

Remedy

AWD system
is overheated.

●

Stop the vehicle in a safe place with the engine running.

If the message disappears after a while, there is no problem. If the
message remains, have the vehicle inspected by your Lexus dealer
immediately.

"AWD System Overheated 2WD Mode Engaged"

Cause

Remedy

AWD system has been
temporarily released
and switched to front-
wheel drive due to over-
heating.

●

Stop the vehicle in a safe place with the engine
running.

If the message disappears after a while, AWD system will
automatically recover. If the message remains, have the
vehicle inspected by your Lexus dealer immediately.

"AWD System Malfunction 2WD Mode Engaged Visit Your Dealer"

Cause

Remedy

A malfunction occurs in the
AWD system.

●

Have the vehicle inspected by your Lexus
dealer immediately.

"Engine Coolant Temp High Stop in a Safe Place See Owner's Manual"

Remedy

Take the corrective actions for overheating.

Related Links

If your vehicle overheats(P. 672)

* :

If equipped

*1 :

When stopping the vehicle, do not stop the engine until the display message has

turned off.

*2 :

When stopping the vehicle, do not stop the engine until the display message has

turned off.

9-2. If a warning is indicated on the meter

572

"Access System with Elec.Key malfunction See owner's manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

"Braking Power Low Stop in a Safe Place See Owner's Manual"

Cause

Remedy

It may indicate a mal-
function.

Immediately stop the vehicle and contact your Lexus
dealer. Continuing to drive the vehicle may be danger-
ous.

"Braking power low Stop in a safe place See owners manual"

Cause

Remedy

It may indicate a mal-
function.

Immediately stop the vehicle and contact your Lexus
dealer. Continuing to drive the vehicle may be danger-
ous.

"Oil pressure low Stop in a safe place See owner's manual"

Cause

Remedy

It may indicate a mal-
function.

Immediately stop the vehicle and contact your Lexus
dealer. Continuing to drive the vehicle may be danger-
ous.

"High Power Consumption Power to Climate Temporarily Limited"

Cause

Remedy

If this message is displayed frequently, there is a
possible malfunction relating to the charging sys-
tem or the battery may be deteriorating.

Have the vehicle checked
by your Lexus dealer imme-
diately.

A message that indicates the need for visiting your Lexus dealer

Cause

Remedy

The system or part shown on the multi-in-
formation display is malfunctioning.

Have the vehicle inspected by your
Lexus dealer immediately.

9-2. If a warning is indicated on the meter

573

When tr

ouble arises

"A New Key has been Registered Contact Your Dealer for Details"

Cause

Remedy

This message will be displayed each
time the driver’s door is opened when
the doors are unlocked from the out-
side for approximately 10 days after
a new electronic key has been regis-
tered.

If this message is displayed but you have
not had a new electronic key registered,
ask your Lexus dealer to check if an un-
known electronic key (other than those
in your possession) has been registered.

"Parking Brake Temporarily Unavailable"

Cause

Remedy

If the parking brake is operated repeatedly
over a short period of time, the system may
restrict operation to prevent overheating.

If this happens, refrain from operat-
ing the parking brake. Normal oper-
ation will return after about 1 minute.

"EPB Activation Stopped Incompletely"

Cause

Remedy

Operate the parking brake switch. If the message
does not disappear after operating the switch several
times, the system may be malfunctioning.

Have the vehicle
checked by your Lexus
dealer.

"Parking Brake Unavailable"

Cause

Remedy

Operate the parking brake switch. If the message
does not disappear after operating the switch several
times, the system may be malfunctioning.

Have the vehicle
checked by your Lexus
dealer.

"Brake Hold Malfunction Press Brake to Deactivate Visit Your Dealer"

Cause

Remedy

The system may be malfunc-
tioning.

Have the vehicle checked by your Lexus dealer
immediately.

9-2. If a warning is indicated on the meter

574

"Transmission Oil Temp High Stop in a Safe Place and See Owner's
Manual"

Cause

Remedy

●

Due to high load driving, oil is hot.

●

The vehicle may be malfunctioning.

Have the vehicle checked by your Lexus
dealer.

"Shift System Malfunction Shifting Unavailable Drive to a Safe Place
and Stop"

Cause

Remedy

There is a malfunction in the shift
control system.

Have the vehicle checked by your Lexus
dealer immediately.

"Shift System Malfunction Driving Unavailable"

Cause

Remedy

There is a malfunction in the shift
control system.

Have the vehicle checked by your Lexus
dealer immediately.

If a message that indicates the need for the shift lever operation is
displayed

Cause

Remedy

To prevent the shift lever from being operated incorrectly
or the vehicle from moving unexpectedly, a message that
requires shifting the shift position may be displayed on
the multi-information display.

Follow the instruction
of the message and
shift the shift position.

"Shift System Malfunction Apply Parking Brake Securely When Parking
See Owner's Manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

9-2. If a warning is indicated on the meter

575

When tr

ouble arises

"P Switch Malfunction Apply Parking Brake Securely When Parking
See Owner's Manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

"Shift System Unavailable Apply Parking Brake Securely When Parking
See Owner's Manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

"Shift System Malfunction See Owner's Manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

"Shift System Malfunction Stop in a Safe Place See Owner's Manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

"Battery Low Shifting Unavailable See Owner's Manual"

Cause

Remedy

It may indicate a malfunction.

Have the vehicle checked by your Lexus dealer
immediately.

"Key Battery Low Replace Key Battery"

Cause

Remedy

The electronic key has a low battery.

Replace the electronic key battery.

9-2. If a warning is indicated on the meter

576

"System Malfunction Visit Your Dealer"

Cause

Remedy

Indicates one of the following systems is disabled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

LTA (Lane Tracing Assist)

●

LCA (Lane Change Assist)

●

AHB (Automatic High Beam)

●

AHS (Adaptive High-beam System)

●

Dynamic radar cruise control system

●

RSA (Road Sign Assist)

●

PDA (Proactive Driving Assist)

●

BSM (Blind Spot Monitor)

●

RCTA (Rear Cross Traffic Alert)

●

Automatic Rear Flashing Hazard Lights

●

Safe Exit Assist

●

Intuitive parking assist

●

PKSB (Parking Support Brake)

●

RCD (Rear camera detection)

●

Have the vehicle inspected
by your Lexus dealer imme-
diately.

* :

If equipped

9-2. If a warning is indicated on the meter

577

When tr

ouble arises

"System Stopped See Owner's Manual"

Cause

Remedy

Indicates one of the fol-
lowing systems is disa-
bled.

●

PCS (Pre-Collision
System)

●

LDA (Lane Departure
Alert)

●

LTA (Lane Tracing As-
sist)

●

LCA (Lane

Change Assist)

●

AHB (Automatic High
Beam)

●

AHS (Adaptive High-
beam System)

●

Dynamic radar cruise
control system

●

RSA (Road Sign

Assist)

●

PDA (Proactive Driv-
ing Assist)

●

BSM (Blind Spot

Monitor)

●

RCTA (Rear Cross

Traffic Alert)

●

Safe Exit Assist

●

Intuitive parking assist

●

PKSB (Parking

Support Brake)

●

Follow the following correction methods.

●

Check the voltage of the battery

●

Check the sensors that the Lexus Safety System + 3
uses for foreign matter covering them. Remove them
if any. (

→

P.346)

●

Check if the back door is open.

* :

If equipped

9-2. If a warning is indicated on the meter

578

Cause

Remedy

●

RCD (Rear cam-

era detection)

●

Follow the following correction methods.

●

Check the voltage of the battery

●

Check the sensors that the Lexus Safety System + 3
uses for foreign matter covering them. Remove them
if any. (

→

P.346)

●

Check if the back door is open.

Indicates the sensors may
not be operating proper-
ly. (

→

P.349)

●

Check the rear bumper around the sensors
used by the BSM, RCTA, Automatic Rear Flash-
ing Hazard Lights, or Safe Exit Assist for for-
eign matter covering them. Remove them if any.
(

→

P.334,415,435,443,426)

●

Check the sensors including camera sensors used
by the Lexus parking assist-sensor, PKSB, or RCD
for foreign matter covering them. Remove them if
any. (

→

P.415,422)

●

Check the sensors including camera sensors used
by the Lexus parking assist-sensor, PKSB, or RCD
for foreign matter covering them. Remove them if
any. (

→

P.431)

●

When problems are solved and the sensors are
operational, this indication may disappear by itself.

9-2. If a warning is indicated on the meter

579

When tr

ouble arises

"System Stopped Front Camera Low Visibility See Owner's Manual"

Cause

Remedy

Indicates one of the following systems is dis-
abled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

LTA (Lane Tracing Assist)

●

LCA (Lane Change Assist)

●

AHB (Automatic High Beam)

●

AHS(Adaptive High-beam System)

●

Dynamic radar cruise control system

●

RSA (Road Sign Assist)

●

PDA (Proactive Driving Assist)

●

Follow the following correction
methods.

●

Using the windshield wipers, re-
move the dirt or foreign matter
from the windshield.

●

Using the air conditioning sys-
tem, defog the windshield.

●

Close the hood, remove any
stickers, etc. to clear the ob-
struction in front of the front
camera.

* :

If equipped

9-2. If a warning is indicated on the meter

580

"System Stopped Front Camera Out of Temperature Range Wait until
Normal Temperature"

Cause

Remedy

Indicates one of the following sys-
tems is disabled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

LTA (Lane Tracing Assist)

●

LCA (Lane Change Assist)

●

AHB (Automatic High Beam)

●

AHS (Adaptive High-beam Sys-
tem)

●

Dynamic radar cruise control sys-
tem

●

RSA (Road Sign Assist)

●

PDA (Proactive Driving As-

sist)

●

Follow the following correction meth-
ods.

●

If the front camera is hot, such as after
the vehicle is parked in the sun, use the
air conditioning system to decrease the
temperature around the front camera

●

If a sunshade was used when the vehicle
was parked, depending on its type, the
sunlight reflected from the surface of the
sunshade may cause the temperature of
the front camera to become excessively
high

●

If the front camera is cold, such after the
vehicle is parked in an extremely cold
environment, use the air conditioning sys-
tem to increase the temperature around
the front camera

* :

If equipped

9-2. If a warning is indicated on the meter

581

When tr

ouble arises

"System Stopped Front Radar Sensor Blocked Clean Radar Sensor"

Cause

Remedy

Indicates one of the following
systems is disabled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

LTA (Lane Tracing Assist)

●

LCA (Lane Change As-

sist)

●

AHB (Automatic High
Beam)

●

AHS (Adaptive High-beam
System)

●

Dynamic radar cruise control
system

●

PDA (Proactive Driving

Assist)

●

Follow the following correction methods.

●

Check if there is any foreign matter attached
to the radar sensor or radar sensor cover and
clean them if necessary.

→

P.346

●

This message may be displayed when driving
in an open area with few nearby vehicles or
structures, such as a desert, grasslands, sub-
urbs, etc.
The message may be cleared by driving the
vehicle in an area with structures, vehicles,
etc. nearby.

"System Stopped Front Radar Sensor Out of Temperature Range Wait
until Normal Temperature"

Cause

Remedy

Indicates one of the following systems is disabled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

LTA (Lane Tracing Assist)

●

LCA (Lane Change Assist)

●

AHB (Automatic High Beam)

●

AHS (Adaptive High-beam System)

●

Dynamic radar cruise control system

●

PDA (Proactive Driving Assist)

●

The temperature of the ra-
dar sensor is outside of the
operating range. Wait for
the temperature to become
appropriate.

* :

If equipped

9-2. If a warning is indicated on the meter

582

"System Stopped Front Radar In Self Calibration See Owner's Manual"

Cause

Remedy

Indicates one of the following sys-
tems is disabled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

LTA (Lane Tracing Assist)

●

LCA (Lane Change Assist)

●

AHB (Automatic High Beam)

●

AHS (Adaptive High-beam Sys-
tem)

●

Dynamic radar cruise control sys-
tem

●

PDA (Proactive Driving As-

sist)

●

Follow the following correction meth-
ods.

●

Check if there is any foreign matter
attached to the radar sensor or radar
sensor cover and clean them if necessa-
ry.

→

P.346

●

The radar sensor may be misaligned and
will be adjusted automatically while driv-
ing. Continue driving for a while.

"Parking Assist Unavailable Low Visibility See Owner's Manual"

Cause

Remedy

Indicates one of the following systems is disa-
bled.

●

RCD (Rear camera detection)

●

PKSB (Parking Support Brake)

●

Remove any dirt or foreign
matter from the front/rear
cameras.

"Unavailable Activation Condition not Satisfied See Owner's Manual"

Cause

Remedy

The LCA function cannot be used as

the operating conditions have not been
met.

→

P.370

●

Operate the turn signal lever again
after all of the operating conditions
are met.

* :

If equipped

9-2. If a warning is indicated on the meter

583

When tr

ouble arises

"Cruise Control Unavailable See Owner's Manual"

Cause

Remedy

Indicates one of the following systems is disabled.

●

Dynamic radar cruise control

●

Cruise control

A message is displayed when the driving assist switch is
pushed repeatedly.

●

Press the driving as-
sist switch quickly
and firmly.

"Parking Assist Unavailable Sensor Blocked"

Cause

Remedy

A sensor may be covered with
water drops, ice, snow, dirt, etc.

●

Remove the water drops, ice, snow, dirt,
etc., from the sensor to return the system to
normal.

If a sensor is dirty, the position of the dirty sen-
sor will be shown on the display.

Due to ice forming on a sensor
at low temperatures, a warning
message may be displayed or the
sensor may not be able to detect
an object.

●

Once the ice melts, the system will return
to normal.

If a warning message is displayed
even if the sensor is clean, there
may be a sensor malfunction.

●

Have the vehicle inspected by your Lexus
dealer.Have the vehicle inspected by any
authorized Lexus retailer or Lexus author-
ized repairer, or any reliable repairer.

9-2. If a warning is indicated on the meter

584

If the engine will not start

When the engine will not start even though the starter operates

Cause

Remedy

There may not be suffi-
cient fuel in the vehicle’s
tank.

Refuel the vehicle.

The engine may be
flooded.

Try to restart the engine again following correct start-
ing procedures.

There may be a malfunc-
tion in the engine immo-
bilizer system.

●

If the key is touching or is covered by a metallic
object, move the key away from the object.

●

If the key is near to or touching a key to the security
system (key with a built-in transponder chip) of
another vehicle, move the key away from the other
key.

Related Links

Refueling(P. 178)
Starting the engine(P. 130)
If a warning message is displayed(P. 570)

When a malfunction of the shift control system is suspected

If any of the following situations occurs, shift control system malfunctions are
possible.
Immediately stop the vehicle in a safe place on level ground, apply the parking
brake, and then contact your Lexus dealer.

●

When the warning message indicating the shift control system appears on the
multi-information display.

●

The display indicates that no shift position is selected for more than a few
seconds.

9-3. If the engine will not start

585

When tr

ouble arises

When the starter operates slowly and the engine cannot be started

Cause

Remedy

The battery may be discharged.

Restarting the engine using jumper (or boos-
ter) cables.

A battery terminal may be loose
or corroded.

Check if a battery terminal is loose or cor-
roded.

Related Links

If the vehicle battery is discharged(P. 589)
Restarting the engine when the battery is discharged(P. 640)

9-3. If the engine will not start

586

When the starter does not operate and the engine cannot be started

Cause

Remedy

The engine starting system may be malfunc-
tioning due to an electrical problem such as
electronic key battery depletion or a blown
fuse.

A temporary measure is available
to start the engine.

One or both of the battery terminals may be
disconnected.

Check if a battery terminal is dis-
connected.

The battery may be discharged.

Restarting the engine using jump-
er (or booster) cables.

Related Links

Starting the engine in an emergency(P. 587)
Starting the engine when the electronic key is not operating normally (P. 588)
If the vehicle battery is discharged(P. 589)
Restarting the engine when the battery is discharged(P. 640)

Starting the engine in an emergency

When the engine cannot be started, the following steps can be used as an tempo-
rary measure to start the engine if the engine 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.

Parking brake indicator will come on.

Check that the shift position is in P.

Turn the engine switch to ACC

*1*2

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

Even if the engine can be started using the above steps, the system may be
malfunctioning.
Have the vehicle checked by your Lexus dealer immediately.

*1 :

ACC mode can be enabled/disabled on a customize setting.

*2 :

When ACC is disabled, turn the engine switch to ON then OFF, and perform the

following steps within 5 seconds.

9-3. If the engine will not start

587

When tr

ouble arises

Starting the engine when the electronic key is not operating normally

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

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

When the electronic key is detected, a buzzer will sound and the engine switch will
change to ON.
If the smart access system with push-button start has been disabled by a customization
setting, the engine switch mode will change to ACC.

Firmly depress the brake pedal and check that a message is shown on the
multi-information display.

Press the engine switch.

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

INFORMATION

■

Stopping the engine

Shift the shift position to P, set the parking brake and press the engine switch as you
normally do when stopping the engine.

■

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.

■

Changing engine switch modes

Release the brake pedal and press the engine switch in step

above. The engine will

not start and the mode will be changed each time the switch is pressed.

Related Links

Replace the electronic key battery(P. 635)

9-3. If the engine will not start

588

When the interior lights or headlights are dim and the engine cannot be
started

Cause

Remedy

The battery may be discharged.

Restarting the engine using the jumper (or
booster) cables.

The battery terminals may be
loose or corroded.

Check if a battery terminal is loose or corrod-
ed.

Related Links

Restarting the engine when the battery is discharged(P. 640)
If the vehicle battery is discharged(P. 589)
Key types(P. 41)
Opening/closing the doors(P. 52)
Using the mechanical key(P. 638)
If a door cannot be opened using the door opener switch(P. 644)
When removing the battery terminals(P. 592)
Items to initialize(P. 730)

If the vehicle battery is discharged

WARNING

■

When replacing the battery

●

When the vent plug and indicator are close to the hold down clamp, the battery fluid
(sulfuric acid) may leak.

●

For information regarding battery replacement, contact your Lexus dealer.

If the battery discharges, it may not be possible to shift the shift position to other
positions.
In this case, the vehicle cannnot be towed without lifting both front wheels because
the front wheels will be locked.

INFORMATION

■

When the battery is removed or discharged

●

In some cases, it may not be possible to unlock the doors using the smart access
system with push-button start after the battery has been replaced.

9-3. If the engine will not start

589

When tr

ouble arises

Use the wireless remote control or the mechanical key to lock or unlock the doors.

●

If the engine cannot be started the first time the engine switch is pressed after
removing and installing the battery, touch the Lexus emblem side of the electronic key
to the engine switch to start the engine.

●

The engine switch mode is memorized by the vehicle.
After the battery has been recharged or replaced, the engine switch will return to the
mode it was in before it was discharged or removed.
Before disconnecting the battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery was dis-
charged, be especially careful when reconnecting the battery.

●

Some systems may require initialization.

●

The Stop & Start system may not automatically stop the engine for up to an hour.

■

To prevent battery discharge

●

Turn off the headlights and the audio system while the engine is off.

●

Turn off any unnecessary electrical components when the vehicle is running at a low
speed for an extended period, such as in heavy traffic.

■

If the vehicle battery is discharged

●

The doors cannot be locked or unlocked using the Smart access system with push-
button start or wireless remote control, and the door opener switches will not operate.
Use the mechanical key to enable/disable manual release handle operation. By
enabling manual release handle operation, the door can be opened.

●

Information recorded by various computers will be cleared.
If the battery has become discharged, have the vehicle inspected by your Lexus dealer.

●

Some systems may require initialization.

■

Charging the battery

The electricity stored in the battery will discharge gradually even when the vehicle is not
in use, due to natural discharge and the draining effects of certain electrical appliances.
If the vehicle is left for a long time, the battery may discharge, and the engine may be
unable to start.
(The battery recharges automatically during driving.)

■

When replacing the battery

●

Use a genuine battery specifically designed for use with the Stop & Start system
or a battery with equivalent specifications to a genuine battery. If an unsupported
battery is used, Stop & Start system functions may be restricted to protect the battery.
Also, battery performance may decrease and the engine may not be able to restart.
Contact your Lexus dealer for details.

9-3. If the engine will not start

590

●

Use a battery that the case size is same as the previous one (LN3), 20 hour rate
capacity (20HR) is equivalent (65Ah) or greater, and performance rating (CCA) is
equivalent (603A) or greater.

•

If the sizes differ, the battery cannot be properly secured.

•

If the 20 hour rate capacity of the replacement battery is low, even if the vehicle is
used frequently, the battery may discharge and engine may not be able to start.

Contact your Lexus dealer for details.

When the doors cannot be locked from outside the vehicle after the battery
was discharged

The doors cannot be locked using the Smart access system with push-button start
or wireless remote control.

Disabling the operation of the 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 door lock
to the lock side to disable the door.

Check that the door cannot be opened.

9-3. If the engine will not start

591

When tr

ouble arises

Disabling the operation of doors other than the driver’s door

Open the door. Using the mechanical key,
slide the cover as shown in the illustration.

To avoid damage, do not apply excessive force to
the cover.

Insert the mechanical key into the opening.

Remove the mechanical key and slide the
emergency lock cover back to its original
position.

Check that all of the doors cannot be opened.

When removing the battery terminals

When disconnecting a battery terminal, contact your Lexus dealer.
If a battery terminal is disconnected, 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 battery
terminal.

9-3. If the engine will not start

592

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.

WARNING

■

When removing the 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 addition to electrical shocks and death or serious injury.

■

Avoiding battery fires or explosions

Observe the following precautions to prevent accidentally igniting the flammable gas that
may be emitted from the battery:
Do not smoke, use matches, cigarette lighters or allow open flame near the battery.

■

Battery precautions

The battery contains poisonous and corrosive acidic electrolyte, while related parts
contain lead and lead compounds. Observe the following precautions when handling the
battery:

●

When working with the 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 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 battery support, terminals, and other
battery-related parts.

9-3. If the engine will not start

593

When tr

ouble arises

WARNING

●

Do not allow children near the battery.

INFORMATION

■

If a battery terminal has been disconnected

●

If a battery terminal has been disconnected, the doors cannot be locked or unlocked
using the Smart access system with push-button start system or wireless remote
control, and the door opener switches will not operate.
Make sure to remove the electronic key (mechanical key) from the vehicle before
disconnecting a battery terminal.
If the electronic key (mechanical key) is to be left in the vehicle, open a window so an
inside manual release handle can be operated.

●

The doors may not be able to be unlocked using the Smart access system with push-
button start immediately after a battery terminal is disconnected and reconnected.
If the doors cannot be unlocked, use the wireless remote control or mechanical key to
lock and unlock the doors.

●

When a battery terminal is disconnected, information recorded by various computers
will be cleared.

●

Some systems may require initialization.

9-3. If the engine will not start

594

When the interior lights or headlights do not illuminate and the engine
cannot be started

Cause

Remedy

The battery may be
discharged.

Restarting the engine using the jumper (or booster) ca-
bles.
Contact your Lexus dealer if the problem cannot be
repaired, or if repair procedures are unknown.

One or both of the
battery terminals may
be disconnected.

Check if a battery terminal is disconnected.
Contact your Lexus dealer if the problem cannot be
repaired, or if repair procedures are unknown.

Related Links

Restarting the engine when the battery is discharged(P. 640)
If the vehicle battery is discharged(P. 589)
Key types(P. 41)
Locking/unlocking the doors(P. 56)
Opening/closing the doors(P. 52)
Using the mechanical key(P. 638)
If a door cannot be opened using the door opener switch(P. 644)
When removing the battery terminals(P. 592)
Items to initialize(P. 730)

9-3. If the engine will not start

595

When tr

ouble arises

When the horn sounds at a low volume and the engine cannot be started

Cause

Remedy

The battery may be discharged.

Restarting the engine using the jumper (or
booster) cables.

The battery terminal connections
may be loose or corroded.

The battery terminals may be loose or cor-
roded.

Related Links

Restarting the engine when the battery is discharged(P. 640)
If the vehicle battery is discharged(P. 589)

9-3. If the engine will not start

596

When the horn does not sound and the engine cannot be started

Cause

Remedy

The battery may be
discharged.

Restarting the engine using the jumper (or booster) ca-
bles.
Contact your Lexus dealer if the problem cannot be
repaired, or if repair procedures are unknown.

One or both of the
battery terminals may
be disconnected.

Check if a battery terminal is loose.
Contact your Lexus dealer if the problem cannot be
repaired, or if repair procedures are unknown.

Related Links

If the vehicle battery is discharged(P. 589)
Restarting the engine when the battery is discharged(P. 640)

9-3. If the engine will not start

597

When tr

ouble arises

If a tire is flat

Repairing a tire with the emergency tire puncture repair kit (vehicles
with an emergency tire puncture repair kit)

Your vehicle is not equipped with a spare tire, but instead is equipped with an
emergency tire puncture repair kit.
A puncture caused by a nail or screw passing through the tire tread can be
repaired temporarily with the emergency tire puncture repair kit. (The kit contains
a bottle of sealant. The sealant can be used only once to temporarily repair one tire
without removing the nail or screw from the tire.)
After temporarily repairing the tire with the kit, have the tire repaired or replaced
by your Lexus dealer.

WARNING

Do not continue driving with a flat tire.
Driving even a short distance with a flat tire can damage the tire and the wheel beyond
repair.
Driving with a flat tire may cause a circumferential groove on the side wall. In such a case,
the tire may explode when using the emergency tire puncture repair kit, resulting in death
or serious injury.

INFORMATION

■

A flat tire that cannot be repaired with the emergency tire puncture repair kit

In the following cases, the tire cannot be repaired with the emergency tire puncture
repair kit.
Contact your Lexus dealer.

●

When the tire is damaged due to driving without sufficient air pressure

●

When the tire lost air pressure due to a crack or damage in the tire sidewall

●

When the tire is visibly separated from the wheel

●

When the cut or damage to the tread is 0.16 in. (4 mm) long or more

●

When the wheel is damaged

●

When two or more tires have been punctured

●

When there is more than one hole or cut in the damaged tire

●

When the sealant has expired

Preparing to use the emergency tire puncture repair kit

Before using the emergency tire puncture repair kit, perform the following.

9-4. If a tire is flat

598

●

Stop the vehicle in a safe place on a hard, flat surface.

●

Set the parking brake.

●

Change the shift position to P.

●

Stop the engine.

●

Turn on the emergency flashers.

●

Check the degree of the tire damage.

A tire should only be repaired with the emergency tire puncture repair kit if the damage
is caused by a nail or screw passing through the tire tread.

•

Do not remove the nail or screw from the tire. Removing the object may widen the
opening and disenable emergency repair with the kit.

•

To avoid sealant leakage, move the vehicle until the area of the puncture, if known, is
positioned at the top of the tire.

Storage position of the emergency tire puncture repair kit and tool

Emergency tire puncture repair kit

Towing eyelet

* :

If equipped

9-4. If a tire is flat

599

When tr

ouble arises

Lexus NX250 (2024 year). Manual in english - page 18