Lexus NX450H+ (2022 year). Manual in english - page 39

Electric power steering system warning light (warning buzzer)

Condition

Cause / Remedy

(red/

yellow)

Indicates a malfunction in the EPS (Electric Power Steering)
system
Have the vehicle checked by your Lexus dealer immediately.

INFORMATION

■

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.

WARNING

When the electric power steering system warning 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.

Low fuel level warning light

Condition

Cause / Remedy

Indicates that remaining fuel is approximately 2.3 gal. (8.5 L, 1.9 Imp.
gal.) or less
Refuel the vehicle.

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

Condition

Cause / Remedy

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.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

641

When tr

ouble arises

INFORMATION

■

Driver’s and front passenger’s seat belt 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 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 vehicle 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
intermittenly for a certain period of time after the vehicle reaches a certain speed.

■

Front passenger detection sensor, seat belt reminder and warning buzzer

●

If luggage is placed on the front passenger 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 sensor may not detect a passenger, and the
warning light may not operate properly.

Rear passengers’ seat belt reminder lights (warning buzzer)

Condition

Cause / Remedy

(Vehicles without a head-up display)

(Vehicles with a head-up display)

Warns the rear passengers to fasten their
seat belts
Fasten the seat belt.

INFORMATION

■

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
intermittently for a certain period of time, after the seat belt is fastened and unfastened
and the vehicle reaches a certain speed.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

642

Tire pressure warning light (warning buzzer)

Condition

Cause / Remedy

When the light comes on after blinking for approximately 1 minute (a
buzzer does not sounds):
Malfunction in the tire pressure warning system
Have the system checked by your Lexus dealer.

When the light comes on (a buzzer sounds):
Low tire inflation pressure from natural causes
After the temperature of the tires has lowered sufficiently, check the
inflation pressure of each tire and adjust them to the specified level.

When the light comes on (a buzzer sounds):
Low tire inflation pressure from flat tire
Immediately stop the vehicle in a safe place and perform the necessa-
ry actions

INFORMATION

■

If the tire pressure warning light comes on

Inspect the tires to check if a tire is punctured.

●

If a tire is punctured:

→

P.682

●

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 pressure warning system. Have the vehicle
inspected by your Lexus dealer immediately.

•

If the tire pressure warning light comes on
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 pressure of each tire is at the specified level and perform the tire
inflation pressure setting procedure.
If the warning light does not turn off even after several minutes have elapsed since
performing the tire inflation pressure setting procedure, have the vehicle inspected
by your Lexus dealer immediately.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

643

When tr

ouble arises

■

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, adjusting
the tire inflation pressure will turn off the warning light (after a few minutes).

WARNING

■

If the tire pressure warning light comes on

Be sure to observe the following precautions. 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).

●

Stop your vehicle in a safe place as soon as possible. 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 braking. 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 provided), should be checked monthly when cold and
inflated to the inflation pressure recommended by the vehicle manufacturer on the
vehicle placard or tire inflation pressure label (tire and load information label). (If your
vehicle has tires of a different size than the size indicated on the vehicle placard or tire
inflation 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 moni-
toring system (TPMS-tire pressure warning system) that illuminates a low tire pressure
telltale (tire pressure warning light) when one or more of your tires is significantly
under-inflated. Accordingly, 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 significantly under-inflated tire causes the tire
to overheat and can lead to tire failure. Under-inflation also reduces fuel efficiency and
tire tread life, and may affect the vehicle’s handling and stopping ability.
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 illumination of the TPMS low tire
pressure telltale (tire pressure warning light).

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

644

WARNING

Your vehicle has also been equipped with a TPMS (tire pressure warning system) mal-
function indicator to indicate when the system is not operating properly. The TPMS (tire
pressure warning system) malfunction indicator is combined 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 illuminated. This
sequence will continue upon subsequent vehicle start-ups as long as the malfunction
exists. When the malfunction indicator is illuminated, the system 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 alternate tires and
wheels allow the TPMS (tire pressure warning system) to continue to function properly.

NOTICE

■

To ensure the tire pressure warning system operates properly

Do not install tires with different specifications or makers, as the tire pressure warning
system may not operate properly.

Intuitive parking assist OFF indicator (warning buzzer)

Condition

Cause / Remedy

Indicates a malfunction in the intuitive parking assist function
Have the vehicle checked by your Lexus dealer immediately.

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.

PCS warning light (warning buzzer)

Condition

Cause / Remedy

Indicates a malfunction in the PCS (Pre-Collision System).
Follow the instructions displayed on the multiinformation display.

●

Illuminates when the PCS (Pre-Collision System) or VSC (Vehicle
Stability Control) system is disabled.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

645

When tr

ouble arises

LTA indicator (warning buzzer)

Condition

Cause / Remedy

（

Or-

ange

）

Indicates a malfunction in the LTA (Lane Tracing Assist).

●

Follow the instructions displayed on the multiinformation
display.

LDA indicator (warning buzzer)

Condition

Cause / Remedy

（

Or-

ange

）

Indicates a malfunction in the LDA (Lane Departure Alert).

●

Follow the instructions displayed on the multiinformation
display.

Dynamic radar cruise control indicator (warning buzzer)

Condition

Cause / Remedy

（

Or-

ange

）

Indicates a malfunction in the dynamic radar cruise control
system.

●

Follow the instructions displayed on the multiinformation
display.

Cruise control indicator (warning buzzer)

Condition

Cause / Remedy

（

Or-

ange

）

Indicates a malfunction in the cruise control system.

●

Follow the instructions displayed on the multiinformation
display.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

646

Driving assist infomation indicator

Condition

Cause / Remedy

Indicates one of the following systems is malfunctioning or disabled.

●

PCS (Pre-Collision System)

●

LDA (Lane Departure Alert)

●

PKSB (Parking Support Brake)

●

RCD (Rear Camera Detection)

●

BSM (Blind Spot Monitor)

●

RCTA(Rear cross traffic alert)

●

Safe Exit Assist (with door opening control)

●

Automatic Rear Flashing Hazard Lights

●

Follow the instructions displayed on the multiinformation display.

Slip indicator

Condition

Cause / Remedy

(illumi-

nates)

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.

* :

If equipped

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

647

When tr

ouble arises

Parking brake indicator

Condition

Cause / Remedy

(U.S.A.)

(flashes) or

(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 immedi-
ately.

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.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

648

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.

"Hybrid System Stopped Steering Power Low"

Cause

Remedy

This message is displayed if the
hybrid system 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 light illuminates/flashes or a warning message is displayed on the meter

649

When tr

ouble arises

"Auto Power OFF to Conserve Battery"

Cause

Remedy

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

Next time when starting the hybrid system, operate
the hybrid system for approximately 5 minutes to
recharge the 12-volt battery.

Related Links

Changing the power switch mode(P. 184)

"Shift is in N Release Accelerator Before Shifting"

Cause

Remedy

The accelerator pedal has been de-
pressed when the shift position is in N.

Release the accelerator pedal and
change the shift position to D or R.

"Press brake when vehicle is stopped Hybrid system may overheat"

Cause

Remedy

The message may be displayed when the ac-
celerator pedal is depressed to hold the vehi-
cle while the vehicle is stopped on an incline,
etc.

The hybrid system may over-
heat. Release the accelerator
pedal and depress the brake
pedal.

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.

"Traction battery needs to be protected. Shift into P to restart."

Cause

Remedy

This message is displayed when the hybrid battery
(traction battery) charge has become extremely low
because the vehicle has been left with the N shift
position selected for a certain amount of time.

When operating the ve-
hicle, shift to P and restart
the hybrid system.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

650

"Traction battery needs to be protected. Refrain from the use of N
position."

Cause

Remedy

This message may be dis-
played when the shift po-
sition is in N.

As the hybrid battery (traction battery) cannot be
charged when the shift position is in N, shift the shift
position to P when the vehicle is stopped.

"Hybrid System Overheated Output Power Reduced"

Cause

Remedy

This message may be
displayed when driving
under severe operating
conditions. (For exam-
ple, when driving up a
long steep hill.)

Stop the vehicle in a safe place.

Stop the hybrid system and carefully lift the hood.

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

If a large amount of coolant has leaked, immediately
contact your Lexus dealer.

Radiator

Cooling fan

Check that the coolant level is between the [FULL]
and [LOW] lines on the reservoir.

Reservoir

[FULL] line

[LOW] line

Add coolant if necessary.

Water can be used in an emer-
gency if coolant is unavailable.

After stopping the hybrid system and waiting for 5
minutes or more, start the hybrid system again and
check for the multi-information display.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

651

When tr

ouble arises

Cause

Remedy

This message may be
displayed when driving
under severe operating
conditions. (For exam-
ple, when driving up a
long steep hill.)

If the message does not disappear: Stop the hybrid sys-
tem and contact your Lexus dealer.
If the message is not displayed: The hybrid system tem-
perature has dropped and the vehicle may be driven
normally.
However, if the message appears again frequently, con-
tact your Lexus dealer.

WARNING

When opening the hood, observe the following precautions.

●

If steam is seen coming from under the hood, do not open the hood until the steam has
subsided. The engine compartment may be very hot.

●

After turning the hybrid system off, check that the "READY" indicator is off.
When the hybrid system is operating, the gasoline engine may automatically start, or
the cooling fan may suddenly operate even if the gasoline engine is stopped.
Also, it may operate for several minutes even after the power switch is turned off.
Do not touch or approach rotating parts such as the fan, which may lead to fingers or
clothing (especially a tie, a scarf or a muffler) getting caught, resulting in serious injury.

●

Do not loosen the coolant reservoir cap while the hybrid system and radiator are hot.
High temperature steam or coolant could spray out.

NOTICE

■

When adding engine/power control unit coolant

Add coolant slowly after the hybrid system 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, dust, etc.).

●

Do not use coolant additives.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

652

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. 612)

"Maintenance Required For Traction Battery At Your Dealer"

Remedy

The hybrid battery (traction battery) is scheduled to be inspected or replaced.
Have the vehicle inspected by your Lexus dealer immediately.

●

Continuing to drive the vehicle without having the hybrid battery (traction
battery) inspected will cause the hybrid system not to start.

●

If the hybrid system does not start, contact your Lexus dealer immediately.

"Headlight System Malfunction Visit Your Dealer"

Cause

Remedy

The system may be malfunction-
ing.

Have the vehicle checked by your Lexus
dealer.

"AWD System Overheated 2WD Mode Engaged"

Cause

Remedy

This message may be
displayed when driving
under extremely high
load conditions.

●

Drive the vehicle at low speeds or stop the vehicle
in a safe place with the hybrid system operating until
the message is cleared.

If the message is not cleared, have the vehicle inspected
by your Lexus dealer.

Remedy

Take the corrective actions for overheating.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

653

When tr

ouble arises

Related Links

If your vehicle overheats(P. 727)

"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.

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 12-volt 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 light illuminates/flashes or a warning message is displayed on the meter

654

"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 light illuminates/flashes or a warning message is displayed on the meter

655

When tr

ouble arises

"Maintenance required for DCDC converter cooling parts See Own-
er's Manual"

Cause

Remedy

The air intake vent or filter of the
DC/DC converter may be clogged,
the air intake vent may be blocked,
or there may be a gap in the duct.
Therefore, perform the following
correction procedure.

●

If the air intake vent or filter of the
DC/DC converter are dirty, clean them.

●

If the warning message is shown when
the air intake vent and filter the DC/DC
converter are not dirty, have the vehicle
inspected at your Lexus dealer.

"EV Mode Unavailable"

Cause

Remedy

The EV drive mode is not available.
The reason the EV drive mode is not available (the vehicle is
idling, battery charge is low, vehicle speed is higher than the
EV drive mode operating speed range or accelerator pedal is
depressed too much) may be displayed.

Use the EV drive
mode when it be-
comes available.

"EV Mode Deactivated"

Cause

Remedy

The EV drive mode is not available.
The reason the EV drive mode is not available (the
battery charge is low, vehicle speed is higher than the
EV drive mode operating speed range or accelerator
accelerator pedal is depressed too much) may be dis-
played.

Drive the vehicle for a
while before attempting
to turn on the EV drive
mode again.

9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter

656

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