2018 LEXUS RC300 battery

1433-1. Key information
3
Operation of each component
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
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 soun d in the cabin when the engine is stopped.
(  P. 485) ●
As the electronic key always receives ra dio waves, the battery will become depleted
even if the electronic key is not used. The following symptoms indi cate that the elec-
tronic key battery may be depleted. Replace the battery when necessary. (  P. 427)
• The smart access system with push-button start 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 3 ft. (1 m) 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
•Table lamps
• Induction cookers ■
Replacing the battery
 P. 427 ■
Confirmation of the registered key number
The number of keys already registered to the vehicle can be confirmed. Ask your Lexus
dealer for details. ■
If a wrong key is used
The key cylinder rotates freely, isol ated from the internal mechanism.

144 3-1. Key information
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)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 temp eratures for long periods of time.●
Do not get the keys wet or wash th em 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 pr oduce magnetic fields, such as TVs, audio
systems and induction cookers. ■
Carrying the electronic key on your person
Carry the electronic key 3.9 in. (10 cm) or mo re away from electric appliances that are
turned on. Radio waves emitted from electric appliances within 3.9 in. (10 cm) of the
electronic key may interfere with the key, causing the key to not function properly.■
In case of a smart access system with pu sh-button start malfunction or other key-
related problems
Take your vehicle with all the electronic keys provided with your vehicle, including the
card key, to your Lexus dealer. ■
When an electronic key is lost
If the electronic key re mains lost, the risk of vehicle th eft increases significantly. Visit
your Lexus dealer immediately with all rema ining electronic keys and the card key that
were provided with your vehicle. ■
Handling the card key (if equipped) ●
Do not apply excess force when inserting th e 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 drin king water etc. is spilled on the key, immedi-
ately remove the battery cover and wipe th e battery and terminals. (To remove the
battery cover, lightly grasp and pull it.) If the battery is corroded, have your Lexus
dealer replace the battery. ●
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 directio n 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.

146 3-2. Opening, closing and locking the doors and trunk
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Operation signals
A buzzer sounds and the emergency flashers flash to indicate that the doors have been
locked/unlocked. (Locked: once; Unlocked: twice)
A buzzer sounds to indicate that th e windows and moon roof are operating.■
Security feature
If a door is not opened within approximately 60 seconds after the vehicle is unlocked, the
security feature automatically locks the vehicle again. ■
Welcome light illumination control
The side marker, parking, tail and license plate lights automati cally 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 surface of the door handle
■
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 d oor to stop the buzzer, and lock the vehicle
once more. ■
Setting the alarm
Locking the doors will set the alarm system. (  P. 80)■
If the smart access system with push-button start or the wireless remote control does
not operate properly
Use the mechanical key and/or inside lock buttons to lock and unlock the doors.
(  P. 518)
Replace the key battery with a new one if it is depleted. (  P. 427)Use your palm to touch the lock sensor.

1533-2. Opening, closing and locking the doors and trunk
3
Operation of each component
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Trunk light ●
The trunk light turns on when the trunk is opened. ●
If the trunk light is left on when the engine sw itch is turned off, the light will go off auto-
matically after 20 minutes. ■
Function to prevent the trunk being lo cked with the electronic key inside ●
When both side doors are locked, closing the trunk lid with the electronic key left inside
the trunk will sound an alarm.
In this case, the trunk lid can be opened by pressing the trunk release button on the
trunk lid. ●
If the spare electronic key is put in the trunk with both side doors locked, the key con-
finement prevention function is activated so the trunk can be opened. In order to pre-
vent theft, take all el ectronic keys with you when leaving the vehicle.●
If the electronic key is put in the trunk with both side doors locked, the key may not be
detected depending on the location of the key and the surrounding radio wave condi-
tions. In this case, the key confinement prev ention function cannot be activated, causing
the doors to lock when the trunk is closed. Make sure to check where the key is before
closing the trunk. ●
The key confinement prevention function cannot be activated if either door is unlocked.
In this case, open the trunk using the trunk opener. ■
Internal trunk release lever
■
Using the mechanical key
The trunk can be also opened using the mechanical key. (  P. 519)■
If the smart access system with push-button start or the wireless remote control does
not operate properly
Use the mechanical key to unlock the trunk. (  P. 519)
Replace the key battery with a new one if it is depleted. (  P. 427)■
When leaving a key to the vehicle with a parking attendant
 P. 142 ■
Customization
The trunk unlocking operation can be changed. (Customizable features:  P. 569)The trunk lid can be open ed by pulling the glow-
in-the-dark lever located on the inside of the
trunk lid upward.
The lever will continue to glow for some time
after the trunk lid is closed.

1573-2. Opening, closing and locking the doors and trunk
3
Operation of each component
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Alarms and warning indicators
An alarm sounds and warning messages are di splayed on the multi-information display
to protect against unexpected accidents or th eft of the vehicle resulting from erroneous
operation. When a warning me ssage is displayed, take appropriate measures based on
the displayed message. (  P. 460)
When only an alarm sounds, circumstances and correction procedures are as follows.
■
Battery-saving function
The battery-saving function w ill be activated in order to pr event the electronic key bat-
tery and the vehicle battery from being discharged while the vehicle is not in operation
for a long time. ●
In the following situations, the smart acce ss system with push-button start may take
some time to unlock the doors.
• The electronic key has been left within appr oximately 6 ft. (2 m) of the outside of the
vehicle for 10 minutes or longer.
• The smart access system with push-button st art has not been used for 5 days or lon-
ger. ●
If the smart access system with push-button start has not been used for 14 days or lon-
ger, the doors cannot be unlocked at the passe nger door. In this case, hold the driver’s
door handle, or use the wireless remote cont rol or mechanical key, to unlock the doors.Alarm Situation Correction procedure
Exterior alarm sounds
once for 5 seconds The trunk was closed while
the electronic key was still
inside the trunk and both
side doors were locked. Retrieve the electronic key
from the trunk and close
the trunk lid.
An attempt was made to
lock the vehicle while a
door was open. Close both side doors and
lock the doors again.
Interior alarm sounds con-
tinuously The engine switch was
turned to ACCESSORY
mode while the driver’s
door was open (or the
driver’s door was opened
while the engine switch
was in ACCESSORY
mode). Turn the engine switch off
and close the driver’s door.
The engine switch was
turned off while the driver’s
door was open. Close the driver’s door.

158 3-2. Opening, closing and locking the doors and trunk
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Electronic Key Battery-Saving Function
When battery-saving mode is set, battery depletion is minimized by stopping the elec-
tronic key from re ceiving radio waves.
■
Conditions affe cting operation
The smart access system with push-button st art uses weak radio wa ves. In the following
situations, the communication between the electronic key and the vehicle may be
affected, preventing the smar t access system with push-but ton start, wireless remote
control and engine immobilizer sy stem from operating properly.
(Ways of coping:  P. 518)●
When the electronic key battery is depleted ●
Near a TV tower, electric power plant, gas st ation, radio station, la rge display, airport or
other facility that generates strong radio wave s or electrical noise●
When carrying a portable radio, cellular phone, cordless phone or other wireless com-
munication device ●
When the electronic key is in contact wi th, or is covered by the following metallic
objects
• Cards to which aluminum foil is attached
• Cigarette boxes that have aluminum foil inside
• Metallic wallets or bags
•Coins
• Hand warmers made of metal
• Media such as CDs and DVDs ●
When other wireless keys (that emit radio waves) are being used nearby ●
When carrying the electronic key together with the following devices that emit radio
waves
• Another vehicle’s electronic key or a wireless key that emits radio waves
• Personal computers or person al digital assistants (PDAs)
• Digital audio players
• Portable game systems ●
If window tint with a metallic content or me tallic objects are atta ched to the rear win-
dow ●
When the electronic key is placed near a battery charger or electronic devicesPress twice while pressing and holding
. Confirm that the electronic key indica-
tor flashes 4 times.
While the battery-saving mode is set, the smart
access system with push -button start cannot be
used. To cancel the function, press any of the
electronic key buttons.

1593-2. Opening, closing and locking the doors and trunk
3
Operation of each component
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Note for the entry function ●
Even when the electronic key is within the effective range (detection areas), the system
may not operate properly in the following cases:
• The electronic key is too close to the window or outside door handle, near the
ground, or in a high place when the doors are locked or unlocked.
• The electronic key is near the ground or in a high place, or too close to the rear
bumper center when the trunk is opened.
• The electronic key is on th e instrument panel, rear pack age tray or floor, or in the
door pockets or glove box when the engine is started or engine switch modes are
changed. ●
Do not leave the electronic key on top of th e instrument panel or near the door pockets
when exiting the vehicle. Depending on the radio wave reception conditions, it may be
detected by the antenna outside the cabin an d the doors will become lockable from the
outside, possibly trapping the electronic key inside the vehicle. ●
As long as the electronic key is within th e effective range, the doors may be locked or
unlocked by anyone. However, only the door s detecting the electronic key can be used
to unlock the vehicle. ●
Even if the electronic key is not inside the vehicle, it may be possible to start the engine
if the electronic key is near the window. ●
The doors may unlock or lock if a large amou nt of water splashes on the door handle,
such as in the rain or in a car wash, when th e electronic key is with in the effective range.
(The doors will automatically be locked af ter approximately 60 seconds if the doors
are not opened and closed.) ●
If the wireless remote control is used to lo ck the doors when the electronic key is near
the vehicle, there is a possibility that the d oor may not be unlocked by the entry func-
tion. (Use the wireless remote control to unlock the doors.) ●
Touching the door lock or unlock sensor while wearing gloves may prevent lock or
unlock operation. ●
When the lock operation is performed using the lock sensor, recognition signals will be
shown up to two consecutive times. After this, no recognition signals will be given.●
If the door handle becomes wet while the el ectronic key is within the effective range,
the door may lock and unlock repeatedly. In this case, follow th e following correction
procedures to wash the vehicle:
• Place the electronic key in a location 6 ft. (2 m) or more away from the vehicle. (Take
care to ensure that the key is not stolen.)
• Set the electronic key to battery-saving mode to disable the smart access system
with push-button start. (  P. 158)●
If the electronic key is inside the vehicle and a door handle becomes wet during a car
wash, a message may be shown on the mult i-information display and a buzzer will
sound outside the vehicle. To turn of f the alarm, lock both side doors.●
The lock sensor may not work properly if it comes into contact with ice, snow, mud, etc.
Clean the lock sensor and attempt to operate it again. ●
A sudden handle operation or a handle operation immediately after entering the effec-
tive range may prevent the doors from bein g unlocked. Touch the door unlock sensor
and check that the doors are unlocked before pulling the door handle again.●
Unlocking the vehicle may take more time if another electronic key is within the effec-
tive range.

184 3-5. Opening, closing the windows and moon roof
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Door lock linked window operation ●
The power windows can be opened an d closed using the mechanical key.
*(  P. 519) ●
The power windows can be opened using the wireless remote control.
* (  P. 145)
* : These settings must be cust omized at your Lexus dealer.■
When the battery is disconnected
The window lock switch is disabled. If nece ssary, press the window lock switch after
reconnecting the battery. ■
Power windows open warning buzzer
The buzzer sounds and a message is shown on the multi-information display in the instru-
ment cluster when the engine switch is turned off and the driver’s door is opened with the
power windows open. ■
Customization
Settings (e.g. linked door lock operation) can be changed.
(Customizable features:  P. 569)