2021 LEXUS RX350 change key battery

1003-2. Opening, closing and locking the doors
To prevent unintended triggering of the
alarm, unlock the doors using the wireless
remote control and open and close a door
once after the settings have been changed.
(If a door is not opened within 60 seconds
after is pressed, the doors will be
locked again and the alarm will automati-
cally be set.)
In a case that the alarm is triggered, imme-
diately stop the alarm. (P.68)
■Impact detection door lock release sys-
tem
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.
■Operation signals
Doors:
A buzzer sounds and the emergency flash-
ers flash to indicate that the doors have
been locked/unlocked. (Locked: Once;
Unlocked: Twice)
Windows and moon roof or panoramic
moon roof:
A buzzer sounds.
■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.
■When the door cannot be locked by the
lock sensor on the surface of the door
handle
When the door cannot be locked even if the
lock sensor on the surface of the door han-
dle is touched by a finger, touch the lock
sensor with the palm.
When gloves are being worn, remove the
gloves.
■Door lock buzzer
If an attempt to lock the doors using the
smart key system is made when a door is
not fully closed, a buzzer will sound continu-
ously for 5 seconds. Fully close the door to
stop the buzzer, and lock the doors again.
■Setting the alarm
Locking the doors will set the alarm system.
(  P.68)
■Conditions affecting the operation of
the smart access system with push-but-
ton start or wireless remote control
 P.116
■If the smart access system with
push-button start or the wireless remote
control does not operate properly
Use the mechanical key to lock and unlock
the doors. ( P.431)
Replace the key battery with a new one if it
is depleted. ( P.379)
■If the battery is discharged
The doors cannot be locked and unlocked
using the smart access system with
push-button start or wireless remote con-
trol. Lock or unlock the doors using the
Multi-information display/BeepUnlocking function
Exterior: Beeps 3 times
Interior: Pings once
Holding the driver’s
door handle unlocks
only the driver’s
door.
Holding any of the
passenger door
handles unlocks all
the doors.
Exterior: Beeps twice
Interior: Pings once
Holding a door han-
dle unlocks all the
doors.

1173-2. Opening, closing and locking the doors
3
Before driving
devices
• Another vehicle’s electronic key, another electronic key of your vehicle, or a wire-
less key that emits radio waves
• Personal computers or personal digital assistants (PDAs)
• Digital audio players
• Portable game systems
●If window tint with a metallic content or
metallic objects are attached to the rear
window
●When the electronic key is placed near a
battery charger or electronic devices
●When the vehicle is parked in a pay park-
ing spot where radio waves are emitted
■Note for the entry function
●Even when the electronic key is within the
effective range (detection areas), the sys-
tem may not operate properly in the fol-
lowing cases:
• The electronic key is too close to the win-
dow 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 back door is
opened.
• The electronic key is on the instrument panel, luggage compar tment, 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
the 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 and the door
will become lockable from the outside,
possibly trapping the electronic key
inside the vehicle.
●As long as the electron ic key is within the
effective range, the doors may be locked
or unlocked by anyone.
●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 if a large amount of water splashes on the door handle,
such as in the rain or in a car wash when
the electronic key is
within the effective
range. (The door will automatically be
locked after approximately 60 seconds if
the doors are not opened and closed.)
●If the wireless remote control is used to
lock the doors when the electronic key is
near the vehicle, there is a possibility that
the door may not be unlocked by the
entry function. (Use the wireless remote
control to unlock the doors.)
●Touching the door lock sensor while
wearing gloves may delay or prevent lock
operation. Remove the gloves and touch
the lock sensor again.
●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
electronic key is within the effective
range, the door may lock and unlock
repeatedly. In that case, follow the follow-
ing 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.116)
●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 multi-information display and a
buzzer will sound outside the vehicle. To
turn off the alarm, lock all the 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 approach to the effective
range or door handle may prevent the
doors from being unlocked. In this case,
return the door handle to the original
position and check that the doors unlock
before pulling the door handle again.
●If there is another electronic key in the

1744-2. Driving procedures
4-2.Driving procedures
1Check that the parking brake is set.
2 Check that the shift lever is in P.
3 Firmly depress the brake pedal.
and a message will be displayed on
the multi-information display.
If it is not displayed, the engine cannot be
started.
4 Press the engine switch shortly and
firmly.
When operating the engine switch, one
short, firm press is enough. It is not neces-
sary to press and hold the switch.
The engine will crank until it starts or for up
to 30 seconds, whichever is less.
Continue depressing the brake pedal until
the engine is completely started.
The engine can be started from any engine
switch mode.
■Engine switch illumination
According to the situation, the engine
switch illumination operates as follows.
●When a door is opened, or the engine
switch mode is changed from ACCES-
SORY or IGNITION ON mode to off,
the engine switch illumination slowly
blinks.
●When depressing the brake pedal with
carrying the electronic key on your per-
son, the engine switch illumination rapidly
blinks.
●When the engine sw itch is in ACCES-
SORY or IGNITION ON mode, the
engine switch illumination illuminates.
■If the engine does not start
●The engine immobilizer system may not
have been deactivated. ( P.66)
Contact your Lexus dealer.
●Check that the shift leve r is securely set in
P. The engine may not start if the shift
lever is displaced out of P. “To Start Vehi-
cle, Put Shift Lever into P” will be dis-
played on the multi-information display.
●If the door is unlock ed with the mechani-
cal key, the engine cannot be started
using the smart access system with
push-button start. Refer to P.432to start
the engine. However, if the electronic key
is carried inside the vehicle and the doors
are locked ( P.101), the engine can be
started.
■Electronic key battery depletion
 P.96
■Conditions affecting operation
 P.116
■Note for the entry function
 P.117
■Steering lock function
●After turning the engine switch off and
opening and closing the doors, the steer-
ing wheel will be lock ed due to the steer-
ing lock function. Operating the engine
switch again automatically cancels the
steering lock.
●When the steering lock cannot be
Engine (ignition) switch
Performing the following opera-
tions when carryin g the electronic
key on your person starts the
engine or changes engine switch
modes.
Starting the engine

1754-2. Driving procedures
4
Driving
released, “Steering Wheel Lock Press
Engine Switch while Turning Wheel” will
be displayed on the multi-information dis-
play.
Check that the shift lever is in P. Press the
engine switch shortly and firmly 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 engine is turned on
and off repeatedly in a short period of
time. In this case, refrain from operating
the engine switch. After about 10 sec-
onds, the steering lock motor will resume
functioning.
■When “Access System with Elec. Key
Malfunction See Owner’s Manual” is
displayed on the mu lti-information dis-
play
The system may be malfunctioning. Have
the vehicle inspected by your Lexus dealer
immediately.
■Electronic key battery
 P.379
■Operation of the engine switch
●If the switch is not pressed shortly and
firmly, the engine switch mode may not
change or the engine may not start.
●If attempting to restart the engine imme-
diately after turning the engine switch off,
the engine may not start in some cases.
After turning the engine switch off, please
wait a few seconds before restarting the
engine.
■Customization
If the smart access sy stem with push-button
start has been deactivated in a customized
setting, refer to P.431.
1 Stop the vehicle completely.
2 Set the parking brake ( P.183),
and shift the shift lever to P.
3 Press the engine switch.
4 Release the brake pedal and check
that the display on the meters is off.
■Automatic engine shut off feature
●The vehicle is equipped with a feature
WARNING
■When starting the engine
Always start the engine while sitting in
the driver’s seat. Do not depress the
accelerator pedal while starting the
engine under any circumstances.
Doing so may cause an accident result-
ing in death or serious injury.
■Caution while driving
If engine failure occurs while the vehicle
is moving, do not lock or open the doors
until the vehicle reaches a safe and com-
plete stop. Activation of the steering lock
in this circumstance may lead to an acci-
dent, resulting in death or serious injury.
NOTICE
■When starting the engine
●Do not race a cold engine.
●If the engine becomes difficult to start
or stalls frequently, have your vehicle
checked by your Lexus dealer immedi-
ately.
■Symptoms indicating a malfunction
with the engine switch
If the engine switch seems to be operat-
ing somewhat differently than usual, such
as the switch sticking slightly, there may
be a malfunction. Contact your Lexus
dealer immediately.
Stopping the engine

4337-2. Steps to take in an emergency
7
When trouble arises
When the smart access system with
push-button start is deactivated in custom-
ization setting, the engine switch will turn
to ACCESSORY mode.
3 Firmly depress the brake pedal and
check that is shown on the
multi-information display.
4 Press the engine switch shortly and
firmly.
In the event that the engine still cannot
be started, contact your Lexus dealer.
■Stopping the engine
Shift the shift lever to P, set the parking
brake, and press the engine switch as you
normally do when stopping the engine.
■Replacing the key battery
As the above procedure is a temporary
measure, it is recomme nded that the elec-
tronic key battery be replaced immediately
when the battery is depleted. ( P.379)
■Alarm (For Canada)
Using the mechanical key to lock the doors
will not set the alarm system.
If a door is unlocked using the mechanical
key when the alarm system is set, the alarm
may be triggered. ( P.68)
■Changing engine switch modes
Release the brake pedal and press the
engine switch in step 3 above. The engine
does not start and modes will be changed
each time the switch is pressed. ( P.177)
If the vehicle battery is dis-
charged
The following procedures may be
used to start the engine if the vehi-
cle’s battery is discharged.
You can also call your Lexus dealer
or a qualified repair shop.

495Alphabetical Index
DifferentialRear differential oil .................................... 447
Dimension ...................................................... 442
Dinghy towing................................................. 173
Display Center Display............................................288
Dynamic radar cruise control with full-speed range .......................................227
Head-up display ...........................................88
Intuitive parking assist.............................. 244
LTA (Lane Tracing Assist)...................... 221
Multi-information display ............................81
RCTA ..............................................................250
Warning message....................................... 412
Distance until next engine oil change .... 80
Do-it-yourself maintenance ......................351
Door courtesy lights ................................... 309 Wattage.......................................................... 449
Door lock Power back door........................................ 103
Side doors ........................................................ 99
Smart access system with push-button start ................................................................... 115
Wireless remote control........................... 97
Door pockets ..................................................316
Doors Automatic door lock ing and unlocking
system ............................................................102
Door glasses .................................................. 144
Door lock warning buzzer .................... 100
Open door warning buzzer ..................102
Outside rear view mirrors ........................141
Rear door child-protectors ....................102
Side doors ........................................................ 99
Drive distance .................................................. 82
Driver’s seat position memory Driving position memory.........................133
Memory recall function ............................135
Power easy access system .....................133
Drive-start control ....................................... 155
Driving Break-in tips .................................................. 155 Correct driving posture ............................ 25
Driving mode select switch .................... 271
Procedures .................................................... 154
Winter drive tips ........................................ 280
Driving assist system information ............ 85
Driving information disp lay ........................ 82
Driving position memory............................133 Memory recall function............................ 135
Power easy access system .................... 133
Driving range ................................................... 82
Dynamic radar cruise control with full-speed range .........................................227Warning message .....................................235
Dynamic Torque Control AWD system .......................................................................... 275
E
Eco Driving Indicator............................83, 92
Eco Driving Indicator Light ........................ 83
EDR (Event data recorder) ............................7
Elapsed time ..................................................... 82
Electric Power Steering (EPS) .............. 275 Warning light .............................................. 405
Electronic key .................................................. 96 Battery-saving function.............................. 116
If the electronic key does not operate properly .........................................................431
Replacing the battery ............................... 379
Electronic sunshade Jam protection function ........................... 150
Operation ....................................................... 149
Emergency flashers .................................... 394
Emergency, in case of If a warning buzzer sounds.................. 403
If a warning light turns on...................... 403
If a warning message is displayed .......412
If the battery is discharged ....................433
If the electronic key does not operate properly .........................................................431
If the engine will not start........................428
If the fuel filler do or cannot be opened
......................................................................... 430