LEXUS NX 300H (2019 year). Manual — part 22

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6-3. Do-it-yourself maintenance

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1

Turn the power switch off.

2

Open the glove box. Slide off the
damper.

3

Push in the glove box on the vehi-
cle’s outer side to disconnect the
claws. Then pull out the glove box
and disconnect the lower claws.

4

Remove the filter cover.

5

Remove the air conditioning filter
and replace it with a new one.

The “

UP” marks shown on the filter

should be pointing up.

■

Checking interval

Inspect and replace the air conditioning fil-

ter according to the maintenance schedule.

In dusty areas or areas with heavy traffic

flow, early replacement may be required.

(For scheduled maintenance information,

please refer to the “Owner’s Manual Sup-

plement” or “Scheduled Maintenance”.)

■

If air flow from the vents decreases dra-

matically

The filter may be clogged. Check the filter

and replace if necessary.

■

Air conditioning filter with deodorizing

function

When fragrances are placed in your vehi-

cle, the deodorizing effect may become

significantly weakened in a short period:

When an air conditioning odor comes out

continuously, replace the conditioning filter.

Air conditioning filter

The air conditioning filter must be
changed regularly to maintain air
conditioning efficiency.

Removal method

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■

When the card key battery needs to be

replaced (if equipped)

The battery for the card key is available only

at Lexus dealers. Your Lexus dealer can

replace the battery for you.

■

If the electronic key battery is depleted

The following symptoms may occur:

●

The smart access system with push-but-

ton start and wireless remote control will

not function properly.

●

The operational range will be reduced.

Prepare the following before replacing
the battery:
 Flathead screwdriver
 Lithium battery CR2032

■

Use a CR2032 lithium battery

●

Batteries can be purchased at your Lexus

dealer, local electrical appliance shops or

camera stores.

●

Replace only with the same or equivalent

type recommended by the manufacturer.

●

Dispose of used batteries according to

the local laws.

NOTICE

■

When using the air conditioning sys-

tem

Make sure that a filter is always installed.

Using the air conditioning system without

a filter may cause damage to the system.

Electronic key battery

Replace the battery with a new one
if it is depleted.

Items to prepare

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1

Take out the mechanical key.

2

Remove the cover.

To prevent damage to the key, cover the tip

of the flathead screwdriver with a tape.

3

Remove the depleted battery.

Insert a new battery with the “+” terminal

facing up.

Replacing the battery

WARNING

■

Removed battery and other parts

These parts are small and if swallowed by

a child, they can cause choking. Keep

away from children. Failure to do so

could result in death or serious injury.

NOTICE

■

For normal operation after replacing

the battery

Observe the following precautions to

prevent accidents:

●

Always work with dry hands.

Moisture may cause the battery to

rust.

●

Do not touch or move any other com-

ponent inside the remote control.

●

Do not bend either of the battery ter-

minals.

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1

Turn the power switch off.

2

Open the fuse box cover.



Engine compartment: type A fuse
box

Push the tab in and lift the lid off.



Engine compartment: type B fuse
box

Push the tab in and lift the lid off.



Left side instrument panel

Remove the lid.



Luggage compartment

3

Remove the fuse.

Only type A fuse can be removed using the

pullout tool.

4

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.

Checking and replacing
fuses

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

Checking and replacing fuses

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

Type A

Normal fuse
Blown fuse



Type B

Normal fuse
Blown fuse



Type C

Normal fuse
Blown fuse



Type D

Normal fuse
Blown fuse

■

After a fuse is replaced

●

If the lights do not turn on even after the

fuse has been replaced, a bulb may need

replacement. (

P.355)

●

If the replaced fuse blows again, have the

vehicle inspected by your Lexus dealer.

■

If there is an overload in a circuit

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 cir-

cuits designed to prevent overload, non-

genuine parts or parts not designed for this

vehicle may be unusable.

A
B

A
B

A
B

WARNING

■

To prevent system breakdowns and

vehicle fire

Observe the following precautions.

Failure to do so may cause damage to

the vehicle, and possibly a fire or injury.

●

Never use a fuse of a higher amperage

rating than that indicated, 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.

A
B

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

Type A

Adjustment bolt A
Adjustment bolt B



Type B

Adjustment bolt A
Adjustment bolt B

 Make sure the vehicle has a full tank

of gasoline and the area around the
headlight is not deformed.

 Park the vehicle on level ground.
 Make sure the tire inflation pressure

WARNING

●

Do not modify the fuses or fuse boxes.

■

Fuse box near the power control unit

Never check or replace the fuses 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

■

Before replacing fuses

Have the cause of electrical overload

determined and repaired by your Lexus

dealer as soon as possible.

Headlight aim

Vertical movement adjusting
bolts

Before checking the headlight
aim

A
B

A
B

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is at the specified level.

 Have someone sit in the driver’s

seat.

 Bounce the vehicle several times.

1

Using a Phillips-head screwdriver,
turn bolt A in either direction.
Remember the turning direction
and the number of turns.



Type A



Type B

2

Turn bolt B the same number of
turns and in the same direction as
step 1.

If the headlight cannot be adjusted using

this procedure, take the vehicle to your

Lexus dealer to adjust the headlight aim.



Type A



Type B

Adjusting the headlight aim

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P.329

Front side marker light (bulb type)
Front turn signal light (bulb type)

■

Bulbs that need to be replaced by
the Lexus dealer

 Headlights
 Front turn signal lights (LED type)
 Parking lights and Daytime running

lights

 Front fog lights
 Front side marker lights (LED type)
 Side turn signal lights
 Stop/tail lights
 Rear side marker lights
 Back-up light
 Rear turn signal light
 High mounted stoplight
 License plate lights
 Outer foot lights

■

LED lights

The lights other than the front side marker

lights (bulb type) and 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.

■

Condensation build-up on the inside of

the lens

Temporary condensation build-up on the

inside of the headlight lens does not indi-

cate 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.

■

When replacing light bulbs

P.352

Light bulbs

You may replace the following bulbs
by yourself.
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 replac-
ing other light bulbs, contact your
Lexus dealer.

Removing the engine compart-
ment cover

Bulb locations

A
B

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

P.409)

■

Front side marker lights (bulb type)

1

Turn the bulb base counterclock-
wise.

2

Remove the light bulb.

3

When installing, reverse the steps
listed.

■

Front turn signal lights (bulb type)

1

Open the hood and remove the
cover for engine compartment
cover. (

P.326, 329)

2

Remove the cover.

Push the center of the clip

and remove

the clip and cover

.

3

Turn the bulb base counterclock-
wise.

4

Remove the light bulb.

5

Replace the light bulb.

Replacing light bulbs

A

B

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6

Turn clockwise and set the bulb
base.

7

Attach the clip to the cover.

Push up on the center of the clip and attach
the clip

.

Clip

8

Attach the cover.

Align the 2 tabs positions and close the
cover

and fix the cover by pushing the

center of the clip

.

9

Install the engine compartment
cover. (

P.329)

A

A

A

B

WARNING

■

Replacing light bulbs

●

Be sure to stop the hybrid system and

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.

●

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 disassem-

ble light bulbs, connectors, electric cir-

cuits or component parts.

Doing so may result in death or serious

injury due to electric shock.

■

To prevent damage or fire

●

Make sure bulbs are fully seated and

locked.

●

Check the wattage of the bulb before

installing to prevent heat damage.

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7

7

When trouble

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When trouble arises

7-1. Essential information

Emergency flashers. . . . ..

360

If your vehicle has to be stopped in

an emergency. . . . . . ..

360

7-2. Steps to take in an emergency

If your vehicle needs to be towed

. . . . . . . . . . . . . .

362

If you think something is wrong

. . . . . . . . . . . . . .

365

If a warning light turns on or a

warning buzzer sounds . ...

367

If a warning message is displayed

. . . . . . . . . . . . . .

376

If you have a flat tire. . . . ..

379

If the hybrid system will not start

. . . . . . . . . . . . . .

387

If you lose your keys. . . . .

388

If the fuel filler door cannot be

opened. . . . . . . . . .

389

If the electronic key does not

operate properly . . . . .

389

If the 12-volt battery is discharged

. . . . . . . . . . . . . .

392

If your vehicle overheats . .

396

If the vehicle becomes stuck

399

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7-1. Essential information

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7-1.Essential information

Press the switch.

All the turn signal lights will flash. To turn
them off, press the switch once again.

■

Emergency flashers

If the emergency flashers are used for a

long time while the hybrid system is not

operating (while the “READY” indicator is

not illuminated), the 12-volt battery may dis-

charge.

1

Steadily step on the brake pedal
with both feet and firmly depress it.

Do not pump the brake pedal repeatedly

as this will increase the effort required to

slow the vehicle.

2

Shift the shift lever to N.



If the shift lever is shifted to N

3

After slowing down, stop the vehi-
cle in a safe place by the road.

4

Stop the hybrid system.



If the shift lever cannot be shifted to
N

3

Keep depressing the brake pedal
with both feet to reduce vehicle
speed as much as possible.

4

To stop the hybrid system, press
and hold the power switch for 2
consecutive seconds or more, or

Emergency flashers

The emergency flashers are used to
warn other drivers when the vehicle
has to be stopped in the road due to
a breakdown, etc.

Operating instructions

If your vehicle has to be
stopped in an emergency

Only in an emergency, such as if it
becomes impossible to stop the
vehicle in the normal way, stop the
vehicle using the following proce-
dure:

Stopping the vehicle

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When trouble

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press it briefly 3 times or more in
succession.

5

Stop the vehicle in a safe place by
the road.

WARNING

■

If the hybrid system has to be turned

off while driving

Power assist for the steering wheel will

be lost, making the steering wheel

heavier to turn. Decelerate as much as

possible before turning off the hybrid sys-

tem.

362

7-2. Steps to take in an emergency

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7-2.Steps to take in an emergency

If your vehicle needs to be
towed

If towing is necessary, we recom-
mend having your vehicle towed by
your Lexus dealer or commercial
towing service, using a wheel-lift
type truck or flatbed truck.
Use a safety chain system for all
towing, and abide by all state/pro-
vincial and local laws.
If towing your vehicle with a wheel-
lift type truck, use a towing dolly.
(

P.362, 363)

WARNING

Observe the following precautions.

Failure to do so may result in death or

serious injury.

■

When towing the vehicle

Be sure to transport the vehicle with all

four wheels raised off the ground. If the

vehicle is towed with the tires contacting

the ground, the drivetrain or related

parts may be damaged, the vehicle may

fly off the truck, or electricity generated

by the operation of the motor may cause

a fire to occur depending on the nature

of the damage or malfunction.

■

While towing

●

When towing using a cables or chains,

avoid sudden starts, etc. which place

excessive stress on the towing eyelets,

cables or chains. The towing eyelets,

cables or chains may become dam-

aged, broken debris may hit people,

and cause serious damage.

●

Do not turn the power switch off.

There is a possibility that the steering

wheel is locked and cannot be oper-

ated.

■

Installing towing eyelets to the vehi-

cle

Make sure that towing eyelets are

installed securely.

If not securely installed, towing eyelets

may come loose during towing.

NOTICE

■

To prevent damage to the vehicle

when towing using a wheel-lift type

truck

●

Do not tow the vehicle from the rear

when the power switch is off. The

steering lock mechanism is not strong

enough to hold the front wheels

straight.

●

When raising the vehicle, ensure ade-

quate ground clearance for towing at

the opposite end of the raised vehicle.

Without adequate clearance, the vehi-

cle could be damaged while being

towed.

■

To prevent damage to the vehicle

when towing with a sling-type truck

Do not tow with a sling-type truck, either

from the front or rear.

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7-2. Steps to take in an emergency

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The following may indicate a problem
with your hybrid transmission. Contact
your Lexus dealer or commercial tow-
ing service before towing. (

P.362)

 The hybrid warning message shows

on the multi-information display and
the vehicle does not move.

 The vehicle makes an abnormal

sound.

Do not tow with a sling-type truck to
prevent body damage.



From the front

Use a towing dolly under the rear
wheels.



From the rear

Use a towing dolly under the front
wheels.

If your vehicle is transported by a flat-
bed truck, it should be tied down at the
locations shown in the illustration.

NOTICE

■

Recreational towing (behind motor

home, etc.)

Never dinghy tow your vehicle to pre-

vent causing serious damage to the

Hybrid AWD system and transmission.

(

P.167)

Situations when it is necessary to
contact dealers before towing

Towing with a sling-type truck

Towing with a wheel-lift type
truck

Using a flatbed truck