Lexus CT (2021 year). Manual in english — page 31

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7-3. Do-it-yourself maintenance

Checking and replacing fuses

Turn the power switch off.
Open the fuse box cover.



Engine compartment

Push the tab in and lift the lid off.



Left side instrument panel

Remove the lid.

Remove the fuse.
Only type A fuse can be removed
using the pullout tool.

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

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7-3. Do-it-yourself maintenance

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Check if the fuse is blown.

Normal fuse
Blown fuse

Replace the blown fuse with a new fuse of an appropriate amperage rating. The

amperage rating can be found on the fuse box lid.

■

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. 643)

●

If the replaced fuse blows again, have the vehicle inspected by any authorized Lexus

retailer or Lexus authorized repairer, or any reliable repairer.

■

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 circuits designed to prevent overload, non-gen-

uine parts or parts not designed for this vehicle may be unusable.

4

1

2



Type A



Type B



Type C



Type D

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7-3. Do-it-yourself maintenance

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.

●

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 any authorized

Lexus retailer or Lexus authorized repairer, or any reliable repairer as soon as possible.

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7-3. Do-it-yourself maintenance

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Light bulbs

Check the wattage of the light bulb to be replaced. (



P. 739)



P. 599

You may replace the following bulbs by yourself. The difficulty level of replace-
ment varies depending on the bulb. As there is a danger that components may
be damaged, we recommend that replacement is carried out by any autho-
rized Lexus retailer or Lexus authorized repairer, or any reliable repairer.

Preparing for light bulb replacement

Removing the engine compartment cover

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7-3. Do-it-yourself maintenance

■

Front

■

Side

Outer foot light

Bulb locations



Vehicles with halogen headlights



Vehicles with LED headlights

Front turn signal light
Headlight low beam
Headlight high beam

Front turn signal light

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2
3

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7-3. Do-it-yourself maintenance

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■

Headlight low beams (halogen headlights)

Unplug the connector while
pressing the lock release.

Turn the bulb base counterclock-
wise.

Set the new light bulb.

Align the 3 tabs on the light bulb with

the mounting, and insert. Turn it

clockwise to set.

Set the connector.

After installing the connector, shake

the bulb base gently to check that it is

not loose, turn the headlight low

beams on once and visually confirm

that no light is leaking through the

mounting.

Replacing light bulbs

1

2

3

4

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7-3. Do-it-yourself maintenance

■

Headlight high beams (halogen headlights)

For the right side only: Move the
washer fluid filler opening.

Unplug the connector while
pressing the lock release.

Turn the bulb base counterclock-
wise.

Set the new light bulb.

Align the 3 tabs on the light bulb with

the mounting, and insert. Turn it

clockwise to set.

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2

3

4

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7-3. Do-it-yourself maintenance

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Set the connector.

After installing the connector, shake

the bulb base gently to check that it is

not loose, turn the headlight high

beams on once and visually confirm

that no light is leaking through the

mounting.

For the right side only: Reinstall the washer fluid filler opening.

■

Front turn signal lights (halogen headlights)

Turn the bulb base counterclock-
wise.

Remove the light bulb.

When installing, reverse the steps listed.

5

6

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2

3

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7-3. Do-it-yourself maintenance

■

Front turn signal lights (LED headlights)

For the right side only: Move the washer fluid filler opening. (



P. 646)

Turn the bulb base counterclockwise.

Remove the light bulb.

When installing, reverse the steps listed.
For the right side only: Reinstall the washer fluid filler opening.

1

2



Left side



Right side

3

4
5

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7-3. Do-it-yourself maintenance

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■

Outer foot lights

Press the upper part of the out-
side rear view mirror to tilt the
mirror face upward, and apply
protective tape to the lower part
of the mirror cover.

Insert 2 flathead screwdrivers
wrapped in protective tape, and
disconnect the tabs behind the
mirror.

Pry the mirror out toward you, dis-

connecting the 2 tabs at a time.
Work carefully, ensuring that you do

not drop the mirror.

Disconnect the connectors
behind the mirror, and remove
the mirror.

When removing the thin connectors,

make sure to mark one of the con-

nectors with a piece of tape, to avoid

mixing them up when reinstalling.
Work carefully, ensuring that you do

not drop the mirror.
When handling the mirror, do not touch the parts applied with grease.
The number of connectors equipped differs by vehicle specification.

1

2

3

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7-3. Do-it-yourself maintenance

Remove the screws and take off
the mirror cover.

Turn the bulb base counterclock-
wise.

Remove the light bulb.

After installing the new bulb,
secure the socket to the light
body.

When inserting the socket, align the

marks printed on the light body and

the socket.

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5

6

7

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7-3. Do-it-yourself maintenance

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Install the visor cover on the mir-
ror frame, secure it with a screw,
and install the side turn signal light
and outer foot light.

Use only the screw position shown in

the illustration.
Side turn signal light: Align the tabs

on the light and the cover and install.
Outer foot light: Interlock the tabs in

the groove of the light body with

those on the cover, and secure.

Disconnect the tabs, and sepa-
rate the top and bottom of the
rear side cover of the mirror.

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9

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7-3. Do-it-yourself maintenance

Install the cover of the back end
of the mirror, installing the lower
side and the upper side in that
order.

When installing the lower side of the

cover, insert the side turn signal light

pin into the hole in the cover.

Secure the cover with screws and
reconnect the connectors back
together.

Secure the cords by returning them

to the hooks as they were.

Align the tabs, and secure the
mirror by pushing in each diago-
nally-opposite pair of tabs in
order.

Make sure to insert the tabs in order

as shown in the illustration, and push

them in until a click is heard.
If you do not hear the click, do not

force the tabs in. Instead, remove the

mirror and check that the tabs are

aligned.

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11

12

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7-3. Do-it-yourself maintenance

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■

Replacing the following bulbs

If any of the lights listed below has burnt out, have it replaced by any autho-
rized Lexus retailer or Lexus authorized repairer, or any reliable repairer.

●

Headlight (LED type)

●

Daytime running lights and front position lights

●

Front fog lights (if equipped)

●

Side turn signal lights

●

Rear turn signal lights

●

Stop/tail lights

●

Back-up lights

●

Rear fog light

●

Rear side marker lights

●

High mounted stoplight

●

License plate lights

■

LED lights

The lights other than headlights (halogen headlights) and front turn signal lights consist of

a number of LEDs. If any of the LEDs burn out, take your vehicle to any authorized Lexus

retailer or Lexus authorized repairer, or any reliable repairer 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 indicate a

malfunction. Contact any authorized Lexus retailer or Lexus authorized repairer, or any

reliable repairer 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. 641

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7-3. Do-it-yourself maintenance

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 unavoid-

able 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 head-

lights or cause condensation to build up on the lens.

●

Do not attempt to repair or disassemble light bulbs, connectors, electric circuits 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.

NOTICE

■

When replacing the outer foot lights

If the front window is stopping you from conducting the replace operation properly,

open the window on the side you are working on to allow you enough space to work.

Continuing the operation without giving yourself enough space to work could lead you

to scratch the vehicle.

655

8

When trouble arises

8-1. Essential information

Emergency flashers . . . . ..656
If your vehicle has to

be stopped in an
emergency. . . . . . . . . 657

If the vehicle is trapped

in rising water . . . . . . ...658

8-2. Steps to take in an emergency

If your vehicle needs to be

towed . . . . . . . . . . ...659

If you think something is

wrong. . . . . . . . . . ...664

If a warning light turns on

or a warning buzzer
sounds. . . . . . . . . . ..665

If a warning message is

displayed . . . . . . . . . ..671

If you have a flat tire (vehicles

without a spare tire). . . ...690

If you have a flat tire (vehicles

with a spare tire). . . . . ..703

If the hybrid system will not

start . . . . . . . . . . . . .714

If the electronic key does not

operate properly. . . . . ...716

If the 12-volt battery is

discharged. . . . . . . . .. 718

If your vehicle overheats. . . 722
If the vehicle becomes

stuck . . . . . . . . . . . . 726