Lexus CT (2021 year). Manual in english - page 6

119

3-1. Key information

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To take out the mechanical key: 
Electronic keys: Slide the release lever
and take the key out.
Card key: Press the lock release button
and take the key out.

The mechanical key can only be

inserted in one direction, as the key only

has grooves on one side. If the key can-

not be inserted in a lock cylinder, turn it

over and re-attempt to insert it.
After using the mechanical key, store it

in the electronic key. Carry the mechan-

ical key together with the electronic key.

If the electronic key battery is depleted

or the entry function does not operate

properly, you will need the mechanical

key. (



P. 716)

■

Card key (if equipped)

●

The card key is not waterproof.

●

The mechanical key that is stored inside the card key should be used only if a problem

arises, such as when the card key does not operate properly.

●

If it is difficult to take out the mechanical key, push down the lock release button using a

pen tip etc. If it is still difficult to pull it out, use a coin etc.

Using the mechanical key

●

To store the mechanical key in the card key,

insert it while pressing the lock release button.

●

If the battery cover is not installed and the bat-

tery falls out or if the battery was removed

because the key got wet, reinstall the battery

with the positive terminal facing the Lexus

emblem.

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3-1. Key information

■

When required to leave the vehicle’s key with a parking attendant

Lock the glove box as circumstances demand. (



P. 569)

Remove the mechanical key for your own use and provide the attendant with the elec-

tronic key only.

■

If you lose your mechanical keys

New genuine mechanical keys can be made by any authorized Lexus retailer or Lexus

authorized repairer, or any reliable repairer using another mechanical key and the key

number stamped on your key number plate. Keep the plate in a safe place such as your

wallet, not in the vehicle.

■

When riding in an aircraft

When bringing an electronic key onto an aircraft, make sure you do not press any but-

tons on the electronic key while inside the aircraft cabin. If you are carrying an electronic

key in your bag etc., ensure that the buttons are not likely to be pressed accidentally.

Pressing a button may cause the electronic key to emit radio waves that could interfere

with the operation of the aircraft. 

■

Electronic key battery depletion

●

The standard battery life is 1 to 2 years. (The card key battery life is about a year and a

half.)

●

If the battery becomes low, an alarm will sound in the cabin when the hybrid system

stops. (



P. 689)

●

As the electronic key always receives radio waves, the battery will become depleted

even if the electronic key is not used. The following symptoms indicate that the elec-

tronic key battery may be depleted. Replace the battery when necessary. (



P. 636)

• The smart entry & start system or the wireless remote control does not operate.

• The detection area becomes smaller.

• The LED indicator on the key surface does not turn on.

●

To avoid serious deterioration, do not leave the electronic key within 1 m (3 ft.) of the

following electrical appliances that produce a magnetic field:
• TVs

• Personal  computers

• Cellular phones, cordless phones and battery chargers

• Recharging cellular phones or cordless phones

• Induction cookers

• Table lamps

■

Replacing the battery



P. 636

■

Confirmation of the registered key number

The number of keys already registered to the vehicle can be confirmed. Ask any autho-

rized Lexus retailer or Lexus authorized repairer, or any reliable repairer for details.

■

If a wrong key is used

The key cylinder rotates freely to isolate inside mechanism.

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3-1. Key information

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NOTICE

■

To prevent key damage

●

Do not drop the keys, subject them to strong shocks or bend them.

●

Do not expose the keys to high temperatures for long periods of time.

●

Do not get the keys wet or wash them in an ultrasonic washer etc.

●

Do not attach metallic or magnetic materials to the keys or place the keys close to

such materials.

●

Do not disassemble the keys.

●

Do not attach a sticker or anything else to the surface of the electronic key.

●

Do not place the keys near objects that produce magnetic fields, such as TVs, audio

systems and induction cookers, or medical electrical equipment, such as low-fre-

quency therapy equipment.

■

Carrying the electronic key on your person

Carry the electronic key 10 cm (3.9 in.) or more away from electric appliances that are

turned on. Radio waves emitted from electric appliances within 10 cm (3.9 in.) of the

electronic key may interfere with the key, causing the key to not function properly.

■

In case of a smart entry & start system malfunction or other key-related problems

Take your vehicle with all the electronic keys provided with your vehicle, including the

card key, to any authorized Lexus retailer or Lexus authorized repairer, or any reliable

repairer.

■

When an electronic key is lost

If the electronic key remains lost, the risk of vehicle theft increases significantly. Visit

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

immediately with all remaining electronic keys and the card key that were provided

with your vehicle.

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3-1. Key information

NOTICE

■

Handling the card key (if equipped)

●

Do not apply excess force when inserting the mechanical key into the card key. Doing

so may damage the card key.

●

If the battery or card key terminals get wet, the battery may corrode.

If the key is dropped into water, or if drinking water etc. is spilled on the key, immedi-

ately remove the battery cover and wipe the battery and terminals. (To remove the

battery cover, lightly grasp and pull it.) If the battery is corroded, have any authorized

Lexus retailer or Lexus authorized repairer, or any reliable repairer replace the bat-

tery.

●

Do not crush the battery cover or use a screwdriver to remove the battery cover.

Forcibly removing the battery cover may bend or damage the key.

●

If the battery cover is frequently removed, the battery cover may become loose.

●

When installing the battery, make sure to check the direction of the battery.

Installing the battery in the wrong direction may cause the battery to deplete rapidly.

●

The surface of the card key may be damaged, or its coating may peel off in the follow-

ing situations:
• The card key is carried together with hard objects, such as coins and keys.

• The card key is scraped with a sharp object, such as the tip of a mechanical pencil.

• The surface of the card key is wiped with thinner or benzene.

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3-2. Opening, closing and locking the doors

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Side doors

◆

Smart entry & start system (vehicles with entry function)

Carry the electronic key to enable this function.

Grip the front door handle to
unlock the doors.

Make sure to touch the sensor on the

back of the handle.
The doors cannot be unlocked for

3 seconds after the doors are locked.

Touch the lock sensor (indenta-
tion on the upper part of the front
door handle) to lock the doors.

Check that the door is securely locked.

◆

Wireless remote control

Locks all the doors

Check that the door is securely

locked.
Press and hold to close the win-

dows.

*

Unlocks all the doors

Press and hold to open the win-

dows.

*

*

: These settings must be customized at

any authorized Lexus retailer or
Lexus authorized repairer, or any
reliable repairer.

■

Operation signals

Doors:

The emergency flashers flash to indicate that the doors have been locked/unlocked.

(Locked: Once; Unlocked: Twice)
Windows:

A buzzer sounds to indicate that the windows are opening.

The vehicle can be locked and unlocked using the entry function, wireless
remote control or door lock switch. 

Locking and unlocking the doors from the outside

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3-2. Opening, closing and locking the doors

■

Security feature

If a door is not opened within approximately 30 seconds after the vehicle is unlocked, the

security feature automatically locks the vehicle again.

■

Welcome light illumination control

The front position, tail and license plate lights automatically turn on at night when the

doors are unlocked using the entry function or wireless remote control if the light switch

is in the “AUTO” position.

■

When the door cannot be locked by the lock sensor on the upper part of the door han-

dle (vehicles with entry function)

■

Door lock buzzer

If an attempt to lock the doors is made when a door is not fully closed, a buzzer sounds

continuously for 5 seconds. Fully close the door to stop the buzzer, and lock the vehicle

once more.

■

Setting the alarm (if equipped)

Locking the doors will set the alarm system. (



P. 89)

■

If the smart entry & start system or the wireless remote control does not operate prop-

erly

●

Use the mechanical key to lock and unlock the doors. (



P. 716)

●

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



P. 636)

If the door will not lock even when the topside

sensor area is touched, try touching both the

topside and underside sensor areas at the same

time.

WARNING

■

When closing the windows using wireless remote control

Observe the following precautions. Failing to do so may result in death or serious

injury.

●

Check to make sure that all passengers do not have any part of their body in a posi-

tion where it could be caught when a window is being operated.

●

To prevent inadvertent power windows operation, never let a small child have and use

the wireless remote control.

■

Jam protection function

●

Never try jamming any part of your body to activate the jam protection function

intentionally.

●

The jam protection function may not work if something gets caught just before the

window fully closes.

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3-2. Opening, closing and locking the doors

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◆

Door lock switch

Locks all the doors
Unlocks all the doors

◆

Inside lock buttons

Locks the door
Unlocks the door

The driver’s door and front passen-

ger’s door (for some models only)

can be opened by pulling the inside

handle even if the lock button is in the

lock position.

Move the inside lock button to the lock position.
Close the door while pulling the door handle.

The door cannot be locked if the power switch is in ACCESSORY or ON mode,
or the electronic key is left inside the vehicle.

The key may not be detected correctly and the door may be locked.

Locking and unlocking the doors from the inside

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1

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Locking the front doors from the outside without a key

1

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3-2. Opening, closing and locking the doors

The door cannot be opened from inside
the vehicle when the lock is set.

Unlock
Lock

These locks can be set to prevent chil-

dren from opening the rear doors. Push

down on each rear door switch to lock

both rear doors.

The following functions can be set or canceled:

For instructions on customizing, refer to P. 742.

Rear door child-protector lock

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Automatic door locking and unlocking systems

Function

Operation

Shift position linked door locking

function

Shifting the shift position to any positions other

than P locks all the doors.

Shift position linked door unlocking

function

Shifting the shift position to P unlocks all the

doors.

Speed linked door locking function All the doors are locked when the vehicle speed

is approximately 20 km/h (12 mph) or higher.

Driver’s door linked door unlocking

function

All the doors are unlocked when the driver’s

door is opened within approximately 45 sec-

onds after turning the power switch off.

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3-2. Opening, closing and locking the doors

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■

Impact detection door lock release system

In the event that the vehicle is subject to a strong impact, all the doors are unlocked.

Depending on the force of the impact or the type of accident, however, the system may

not operate.

■

Using the mechanical key

The doors can also be locked and unlocked with the mechanical key. (



P. 716)

■

If a wrong key is used

The key cylinder rotates freely to isolate inside mechanism.

■

Customization

Settings (e.g. unlocking function using a key) can be changed. 

(Customizable features: 



P. 742)

WARNING

■

To prevent an accident

Observe the following precautions while driving the vehicle.

Failure to do so may result in a door opening and an occupant throwing out of the vehi-

cle, resulting in death or serious injury.

●

Ensure that all doors are properly closed.

●

Do not pull the inside handle of the doors while driving.
Be especially careful for the front doors, as the door may be opened even if the

inside lock buttons are in locked position.

●

Set the rear door child-protector locks when children are seated in the rear seats. 

■

When opening or closing a door

Check the surroundings of the vehicle such as whether the vehicle is on an incline,

whether there is enough space for a door to open and whether a strong wind is blow-

ing. When opening or closing the door, hold the door handle tightly to prepare for any

unpredictable movement.

■

When using the wireless remote control and operating the power windows

Operate the power window after checking to make sure that there is no possibility of

any passenger having any of their body parts caught in the window. Also, do not allow

children to operate the wireless remote control. It is possible for children and other

passengers to get caught in the power window. 

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3-2. Opening, closing and locking the doors

Back door

◆

Smart entry & start system (vehicles with entry function)

Carry the electronic key to enable this function.

Locks all the doors

Check that the door is securely

locked.

Unlocks all the doors

The doors cannot be unlocked for 3

seconds after the doors are locked.

◆

Wireless remote control



P. 118

◆

Door lock switch



P. 125

The back door can be locked/unlocked and opened by the following proce-
dures.

Locking and unlocking the back door

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3-2. Opening, closing and locking the doors

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Raise the back door while pushing up
the back door opener switch.

Lower the back door using the back
door handle, and make sure to push the
back door down from the outside to
close it.

Opening the back door from outside the vehicle

When closing the back door

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3-2. Opening, closing and locking the doors

■

Luggage compartment light

The luggage compartment light turns on when the back door is opened with the luggage

compartment light switch on.

■

If the back door opener is inoperative

The back door can be unlocked from the inside.

Off
On
When the power switch is turned off, the light

will go off automatically after 20 minutes.

Lift the center deck board and remove the

cover (if equipped), and then push up the lever

in the hole.

WARNING

Observe the following precautions.

Failure to do so may result in death or serious injury.

■

Before driving

●

Make sure that the back door is fully closed. If the back door is not fully closed, it may

open unexpectedly while driving and hit near-by objects or luggage in the luggage

compartment may be thrown out, causing an accident.

●

Do not allow children to play in the luggage compartment.

If a child is accidentally locked in the luggage compartment, they could have heat

exhaustion or other injuries.

●

Do not allow a child to open or close the back door.

Doing so may cause the back door to open unexpectedly, or cause the child’s hands,

head, or neck to be caught by the closing back door.

■

Important points while driving

●

Keep the back door closed while driving.

If the back door is left open, it may hit near-by objects or luggage in the luggage com-

partment may be thrown out, causing an accident.

●

Never let anyone sit in the luggage compartment. In the event of sudden braking,

sudden swerving or a collision, they are susceptible to death or serious injury. 

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3-2. Opening, closing and locking the doors

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WARNING

■

Operating the back door

Observe the following precautions.

Failure to do so may cause parts of the body to be caught, resulting in death or serious

injury.

●

Remove any heavy loads, such as snow and ice, from the back door before opening it.

Failure to do so may cause the back door to suddenly shut again after it is opened.

●

When opening or closing the back door, thoroughly check to make sure the sur-

rounding area is safe. 

●

If anyone is in the vicinity, make sure they are safe and let them know that the back

door is about to open or close.

●

Use caution when opening or closing the back door in windy weather as it may move

abruptly in strong wind.

●

Do not pull on the back door damper stay to close the back door, and do not hang on

the back door damper stay. 

Doing so may cause hands to be caught or the back door damper stay to break, caus-

ing an accident.

●

If a bicycle carrier or similar heavy object is attached to the back door, it may sud-

denly shut again after being opened, causing someone’s hands, head or neck to be

caught and injured. When installing an accessory part to the back door, using a genu-

ine Lexus part is recommended.

●

The back door may suddenly shut if it is not

opened fully. It is more difficult to open or

close the back door on an incline than on a

level surface, so beware of the back door

unexpectedly opening or closing by itself.

Make sure that the back door is fully open and

secure before using the luggage compart-

ment. 

●

When closing the back door, take extra care

to prevent your fingers etc. from being

caught.

●

When closing the back door, make sure to

press it lightly on its outer surface. If the back

door handle is used to fully close the back

door, it may result in hands or arms being

caught.

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3-2. Opening, closing and locking the doors

NOTICE

■

Back door damper stays

The back door is equipped with damper stays that hold the back door in place.
Observe the following precautions.

Failure to do so may cause damage to the back door damper stay, resulting in malfunc-

tion.

●

Do not attach any foreign objects, such as

stickers, plastic sheets, or adhesives to the

damper stay rod.

●

Do not touch the damper stay rod with gloves

or other fabric items.

●

Do not attach any accessories other than

genuine Lexus parts to the back door.

●

Do not place your hand on the damper stay or

apply lateral forces to it.

Damper stays

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Smart entry & start system

●

Locks and unlocks the doors (vehicles with entry function) (



P. 123)

●

Locks and unlocks the back door (vehicles with entry function) (



P. 128)

●

Starts and stops the hybrid system (



P. 265)

■

Antenna location

■

Effective range (areas within which the electronic key is detected)

The following operations can be performed simply by carrying the electronic
key (including the card key) on your person, for example in your pocket. The
driver should always carry the electronic key.

Antennas outside the cabin (vehicles with

entry function)
Antennas inside the cabin
Antenna inside the luggage compartment
Antenna outside the luggage compartment 

(vehicles with entry function)

When locking or unlocking the doors 

(vehicles with entry function)
The system can be operated when the elec-

tronic key is within about 0.7 m (2.3 ft.) of

either of the outside front door handles or

back door opener switch. (Only the doors

detecting the key can be operated.)
When starting the hybrid system or chang-

ing power switch modes
The system can be operated when the elec-

tronic key is inside the vehicle.

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3
4

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3-2. Opening, closing and locking the doors

■

Alarms and warning messages

An alarm sounds and warning message displays shown on the multi-information display

are used to protect against unexpected accidents or theft of the vehicle resulting from

erroneous operation. When a warning message is displayed, take appropriate measures

based on the displayed message. (



P. 671)

When only an alarm sounds, circumstances and correction procedures are as follows.

■

Battery-saving function (vehicles with entry function)

The battery-saving function will be activated in order to prevent the electronic key bat-

tery and the 12-volt battery from being discharged while the vehicle is not in operation

for a long time.

●

In the following situations, the smart entry & start system may take some time to unlock

the doors.
• The electronic key has been left in an area of approximately 2 m (6 ft.) of the outside

of the vehicle for 10 minutes or longer.

• The smart entry & start system has not been used for 5 days or longer.

●

If the smart entry & start system has not been used for 14 days or longer, the doors can-

not be unlocked at any doors except the driver’s door. In this case, take hold of the

driver’s door handle, or use the wireless remote control or the mechanical key, to

unlock the doors.

■

Conditions affecting operation

The smart entry & start system, wireless remote control and immobilizer system use

weak radio waves. In the following situations, the communication between the electronic

key and the vehicle may be affected, preventing the smart entry & start system, wireless

remote control and immobilizer system from operating properly. 

(Ways of coping: 



P. 716)

●

When the electronic key battery is depleted

●

Near a TV tower, electric power plant, gas station, radio station, large display, airport or

other facility that generates strong radio waves or electrical noise

●

When carrying a portable radio, cellular phone, cordless phone or other wireless com-

munication devices

Alarm

Situation

Correction procedure

Exterior alarm

sounds once for 5

seconds (vehicles

with entry function)

An attempt was made to lock

the vehicle while a door was

open.

Close all of the doors and

lock the doors again.

Interior alarm pings

repeatedly

The power switch was turned to

ACCESSORY mode while the

driver’s door was open (The

driver’s door was opened when

the power switch was in

ACCESSORY mode).

Turn the power switch off

and close the driver’s door.