Content .. 42 43 44 45 ..

Lexus NX450H+ (2022 year). Manual in english - page 44

If abnormal sounds are emitted from the vehicle

Condition

Remedy

The following sounds are abnormal sounds.

●

Changes in exhaust sound

●

Excessive tire squeal when cornering

●

Strange noises related to the suspension system

●

Pinging or other noises related to the hybrid system

Contact your Lexus deal-
er as soon as possible.
Your vehicle probably
needs adjustment or re-
pair.

9-11. If you think something is wrong

721

When tr

ouble arises

If the vehicle behaves abnormally

The following symptoms are abnormal.

●

Engine misfiring or misses, stumbling or running 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

Contact your Lexus dealer as soon as possible. Your vehicle probably needs
adjustment or repair.

9-11. If you think something is wrong

722

Items to check before contacting a dealership

The steering wheel cannot be turned after the hybrid system is stopped

It is locked automatically to prevent theft of the vehicle.

●

When the steering lock cannot be released,
"Push Power Switch while Turning Steering
Wheel in Either Direction" will be displayed
on the multi-information display. Check that
the shift position is in P. Press the power
switch while turning the steering wheel left
and right.

●

To prevent the steering lock motor from overheating, operation of the motor
may be suspended if the hybrid system is turned on and off repeatedly in a
short period of time. In this case, refrain from operating the hybrid system.
After about 10 seconds, the steering lock motor will resume functioning.

Related Links

Changing the power switch mode(P. 184)

9-12. Items to check before contacting a dealership

723

When tr

ouble arises

If the windows do not open or close by operating the power window
switches

Check if the window lock switch is on.
If the window lock switch is on, the power windows other than that for the
driver’s seat cannot be operated.
Turn the window lock switch off.

●

When the jam protection function or catch protection function operates
unusually and the side window cannot be opened or closed, perform the
following operations with the power window switch of that door.

●

Stop the vehicle. With the power switch in ON, within 4 seconds of the jam
protection function or catch protection function activating, continuously operate
the power window switch in the one-touch closing direction or one-touch opening
direction so that the door window can be opened and closed.

●

If the door window cannot be opened and closed even when performing the
above operations, perform the procedure for function initialization.

Initializing the jam protection function/catch protection function

Turn the power switch to ON.

Pull and hold the power window switch in the one-touch closing direction and
completely close the side window.

Release the power window switch for a moment, resume pulling the switch in
the one-touch closing direction, and hold it there for approximately 6 seconds
or more.

Press and hold the power window switch in the one-touch opening direction.
After the side window is completely opened, continue holding the switch for an
additional 1 second or more.

Release the power window switch for a moment, resume pushing the switch in
the one-touch opening direction, and hold it there for approximately 4 seconds
or more.

9-12. Items to check before contacting a dealership

724

Pull and hold the power window switch in the one-touch closing direction
again. After the side window is completely closed, continue holding the switch
for a further 1 second or more.

If you release the switch while the window is moving, start again from the beginning.
If the window reverses and cannot be fully closed or opened, have the vehicle inspect-
ed by your Lexus dealer.

9-12. Items to check before contacting a dealership

725

When tr

ouble arises

The power switch is turned off automatically

In the following situations, power will be turned off due to the automatic power
off function.

●

The vehicle is left in ACC or ON (the hybrid system is not operating) for
more than 20 minutes with the shift position in P.

●

The 12-volt battery is low with the shift position is in P and the power switch is
in ACC or ON (the hybrid system is not operating).

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

Do not leave the vehicle with the power switch in ACC or ON for long periods of time
when the hybrid system is not operating.

9-12. Items to check before contacting a dealership

726

If your vehicle overheats

The following may indicate that your vehicle is overheating.

●

The high coolant temperature warning light comes on.

●

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

●

"Hybrid System Overheated Output Power Reduced" is displayed on the multi-
information display.

●

Steam comes out from under the hood.

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

WARNING

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.

If you do not see steam, carefully lift the hood.

If you see steam, carefully lift the hood after the steam subsides.

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.

9-12. Items to check before contacting a dealership

727

When tr

ouble arises

WARNING

●

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

After the hybrid system has cooled down sufficiently, 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

Radiator cap

Add coolant if necessary.

Water can be used in an emergency if coolant is unavailable.

NOTICE

■

When adding engine/power control unit coolant

Add coolant slowly after the hybrid system has cooled down sufficiently.

9-12. Items to check before contacting a dealership

728

NOTICE

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.

Start the hybrid system and turn the air conditioning system on to check
that the radiator cooling fan operate and to check for coolant leaks from the
radiator or hoses.

The fan operates when the air conditioning system is turned on immediately after a
cold start.
Confirm that the fan is operating by checking the fan sound and air flow. If it is
difficult to check these, turn the air conditioning system on and off repeatedly. (The
fan may not operate in freezing temperatures.)

If the fan is not operating: Stop the hybrid system immediately and contact
your Lexus dealer.

If the fan is operating: Have the vehicle inspected at the nearest Lexus dealer.

Check if "Engine Coolant Temp High Stop in a Safe Place See Owner's
Manual" is displayed 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.

9-12. Items to check before contacting a dealership

729

When tr

ouble arises

If electrical components cannot be used or do not operate when a
switch is operated

If any of the electrical components do not operate, a fuse may have blown.
If this happens, check and replace the fuses as necessary.

Related Links

Checking and replacing fuses(P. 731)

9-12. Items to check before contacting a dealership

730

If a light does not illuminate

The following may be the cause:

●

The 12-volt battery may be discharged.

●

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

●

A fuse may have blown. Check the fuses.

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

INFORMATION

■

Condensation build-up on the inside of a lens

Temporary condensation build-up on the inside of the headlight lens does not indicate
a malfunction. Contact your Lexus dealer for more information in the following
situations:

●

Large drops of water have built up on the inside of the lens.

●

Water has built up inside the headlight.

Checking and replacing fuses

WARNING

Observe the following precautions. Failure to do so may cause damage to the vehicle,
possibly leading to a fire or injury.

●

Never use a fuse of a higher amperage rating than specified, or use any other object in
place of a fuse.

●

Always use a genuine Lexus fuse or equivalent. Never replace a fuse with a wire, even
as a temporary fix.

●

Do not modify the fuses or fuse boxes.

●

Never check or replace the fuses in the fuse box near the inverter with converter
assembly, as there are high voltage parts and wiring near the fuse box.
Doing so may cause electric shock, resulting in death or serious injury.

NOTICE

Have the cause of electrical overload determined and repaired by your Lexus dealer as
soon as possible.

Turn the power switch off.

Open the fuse box cover.

9-12. Items to check before contacting a dealership

731

When tr

ouble arises

▶

Engine compartment (Type A)

Push in the claw and remove the lid.

▶

Engine compartment (Type B)

Push in the claw and remove the lid.

▶

Left side instrument panel

Remove the lid.

▶

Luggage compartment (Type A)

Fold the deck board, remove the side board and cover, then remove the fuse box cover.

9-12. Items to check before contacting a dealership

732

▶

Luggage compartment (Type B)

Fold the deck board, remove the side board and cover, then remove the fuse box cover.

Remove the fuse.

Only some fuses can be removed using the pullout tool.

9-12. Items to check before contacting a dealership

733

When tr

ouble arises

Check if the fuse is blown.

Replace the blown fuse with a new fuse of an appropriate amperage rating. The
amperage rating can be found on the fuse box lid.

Normal fuse

Blown fuse

INFORMATION

■

After a fuse is replaced

●

When installing the lid, make sure to engage the claw securely.

●

If the lights do not turn on even after the fuse has been replaced, a bulb may need
replacement.

●

If the replaced fuse blows again, have the vehicle inspected by your Lexus dealer.

■

If a circuit is overloaded

The fuses are designed to blow, protecting the wiring harness from damage.

■

When replacing light bulbs

Lexus recommends that you use genuine Lexus products designed for this vehicle.
Because certain bulbs are connected to circuits designed to prevent overload,
non-genuine parts or parts not designed for this vehicle may be unusable.

9-12. Items to check before contacting a dealership

734

Light bulbs

The difficulty level of replacement varies depending on the bulb. If necessary
bulb replacement seems difficult to perform, contact your Lexus dealer.For more
information about replacing other light bulbs, contact your Lexus dealer.

■

Replacing the following bulbs

If any of the lights listed below has burnt out, have it replaced by your Lexus dealer.

●

Headlight

●

Front position lights and daytime running lights

●

Front turn signal lights (LED type)

●

Side turn signal lights

●

Front side marker lights

●

Front fog lights

●

Cornering lights

●

Stop/tail lights

●

Rear side marker lights

●

Back-up light

●

Rear turn signal light

●

High mounted stoplight

●

License plate lights

INFORMATION

■

LED Lights

The lights other than the front turn signal lights (bulb type) each consist of a number of
LEDs. If any of the LEDs burn out, take your vehicle to your Lexus dealer to have the light
replaced.

WARNING

Observe the following precautions related to replacing the bulbs.

●

Turn off the lights. Do not attempt to replace the bulb immediately after turning off the
lights.The bulbs become very hot and may cause burns.

●

Do not touch the glass portion of the light bulb with bare hands. When it is unavoidable
to hold the glass portion, use and hold with a clean dry cloth to avoid getting moisture
and oils on the bulb.Also, if the bulb is scratched or dropped, it may blow out or crack.

* :

If equipped

9-12. Items to check before contacting a dealership

735

When tr

ouble arises

WARNING

●

Fully install light bulbs and any parts used to secure them. Failure to do so may
result in heat damage, fire, or water entering the headlight unit. This may damage the
headlights or cause condensation to build up on the lens.

●

Do not attempt to repair or disassemble the light bulbs, connectors, electric circuits or
related parts.
Doing so may result in electric shock leading to death or serious injury.

●

To prevent damage or fire, make sure the bulbs are fully installed and securely locked
into each light unit.

●

Check the wattage of the bulb before installing it to prevent heat damage.

Bulb locations

Front turn signal light (bulb type)

Replacing the front turn signal lights (bulb type)

Before replacing, check the wattage of the light bulb to be replaced.

Turn the bulb base counterclockwise.

Remove the light bulb.

9-12. Items to check before contacting a dealership

736

Content .. 42 43 44 45 ..