key battery Lexus IS350 2021 / LEXUS 2021 IS 300, IS 350 (OM53E98U) User Guide

1344-2. 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.
■If the engine does not start
●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.
●The engine immobilizer system may not
have been deactivated. ( P.60)
Contact your Lexus dealer.
■Electronic key battery depletion
 P.88
■Conditions affecting operation
 P.100
■Notes for the entry function
 P.101
■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
released, “Push Engine Switch while
Turning Steering Whee l in Either Direc-
tion” will be displayed on the multi-infor-
mation display.
Check that the shift lever is in P. Press the
engine switch 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 multi-information dis-
play
The system may be ma lfunctioning. Have
the vehicle inspected by your Lexus dealer
immediately.
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

1354-2. Driving procedures
4
Driving
■If the electronic key battery is depleted
 P.316
■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.
■If the smart access system with
push-button start has been deactivated
by a customized setting
 P.359
1 Stop the vehicle.
2 Set the parking brake ( P.143),
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
that automatically shuts off the engine
when the shift lever is in P with the engine
running for an extended period.
●The engine will automatically shut off
after approximately 1 hour if it has been
left running while the shift lever is in P.
●The timer for the automatic engine shut
off feature will reset if the brake pedal is
depressed or if the shift lever is in a posi-
tion other than P.
●After the vehicle is parked, if the door is
locked with the door lock switch ( P.94)
from the inside or the mechanical key
from the outside, the automatic engine
shut off feature will be disabled. The timer
for the automatic engine shut off feature
will be re-enabled if the driver’s door is
opened.
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

1504-3. Operating the lights and wipers
Doing so interferes with the sensor detect-
ing the level of ambient light and may cause
the automatic headlight system to malfunc-
tion.
■Automatic light off system
When the light switch is in , or : The headlights and tail lights turn off
30 seconds after the engine switch is
turned to ACCESSORY mode or turned
off and a door is opened and all of the doors
and trunk are closed. (The lights turn off
immediately if on the key is pressed
twice after all the doors are closed.)
To turn the lights on again, turn the engine
switch to IGNITION ON mode, or turn the
light switch off once and then back to
or .
If any of the doors or trunk lid is left open,
the lights automatically turn off after 20
minutes.
■Light reminder buzzer
A buzzer sounds when the engine switch is
turned off or turned to ACCESSORY
mode and the driver’s door is opened while
the lights are turned on.
■Automatic headlight leveling system (if
equipped)
The level of the headlights is automatically
adjusted according to the number of pas-
sengers and the loading condition of the
vehicle to ensure that the headlights do not
interfere with other road users.
■Customization
Some functions can be customized.
(  P.394)
1 With the headlights on, push the
lever away from you to turn on the
high beams.
Pull the lever toward you to the center
position to turn the high beams off.
2Pull the lever toward you and
release it to flash the high beams
once.
You can flash the high beams with the
headlights on or off.
NOTICE
■To prevent battery discharge
Do not leave the lights on longer than
necessary when the engine is not run-
ning.
Turning on the high beam head-
lights

2645-3. Using the interior lights
Turns the door position on/off
On
Off
■Rear interior light
The rear interior light turns on/off
together with the front interior light.
■Front personal lights
Turns the lights on/off (touch the light)
■Rear personal lights
Turns the light on/off
■Illuminated entry system
The lights automatically turn on/off accord-
ing to engine switch mode, the presence of
the electronic key, whether the doors are
locked/unlocked, and whether the doors
are opened/closed.
■To prevent the battery from being dis-
charged
If the interior lights remain on when the
engine switch is turned off, the lights will go
off automatically after 20 minutes.
■When front interior light or front per-
sonal lights do not respond as normal
In the following cases, the interior lights and
front personal lights may not respond as
normal.
●When water, dirt, etc., have adhered to
the lens surface
●When operated with a wet hand
●When wearing gloves, etc.
■The interior lights may turn on automati-
cally when
If any of the SRS airbag s deploy (inflate) or
in the event of a strong rear impact, the inte-
rior lights will turn on automatically.
The interior lights will turn off automatically
after approximately 20 minutes.
The interior lights can be turned off manu-
ally. However, in order to help prevent fur-
ther collisions, it is recommended that they
be left on until sa fety can be ensured.
(The interior lights may not turn on auto-
matically depending on the force of the
impact and conditions of the collision.)
Operating the personal lights
A
B

279
6
6
Maintenance and care
Maintenance and care
.6-1. Maintenance and careCleaning and protecting the vehi-cle exterior ................................ 280
Cleaning and protecting the vehi- cle interior ................................. 283
6-2. Maintenance Maintenance requirements........................................................ 286
General maintenance ............. 287
Emission inspection and mainte- nance (I/M) programs ......... 290
6-3. Do-it-yourself maintenance Do-it-yourself service precautions......................................................... 291
Hood............................................... 293
Positioning a floor jack............ 293
Engine compartment............... 295
Tires ................................................ 303
Tire inflation pressure ............... 312
Wheels............................................ 313
Air conditioning filter................315
Electronic key battery .............. 316
Checking and replacing fuses ......................................................... 318
Headlight aim.............................. 320
Light bulbs ..................................... 321

2806-1. Maintenance and care
6-1.Maintenance and care
Working from top to bottom, liber-
ally apply water to the vehicle body,
wheel wells and underside of the
vehicle to remove any dirt and dust.
 Wash the vehicle body using a
sponge or soft cloth, such as a
chamois.
 For hard-to-remove marks, use car
wash soap and rinse thoroughly with
water.
 Wipe away any water.
 Wax the vehicle when the water-
proof coating deteriorates.
If water does not bead on a clean surface,
apply wax when the vehicle body is cool.
■Self-restoring coat
The vehicle body has a self-restoring coat-
ing that is resistant to small surface
scratches caused in a car wash etc.
●The coating lasts for 5 to 8 years from
when the vehicle is delivered from the
plant.
●The restoration time differs depending on
the depth of the scratch and outside tem-
perature.
The restoration time may become
shorter when the coating is warmed by
applying warm water.
●Deep scratches caused by keys, coins,
etc. cannot be restored.
●Do not use wax that contains abrasives.
■Automatic car washes
●Fold the mirrors befo re washing the vehi-
cle. Start washing from the front of the
vehicle. Make sure to extend the mirrors
before driving.
●Brushes used in automatic car washes
may scratch the vehicle surface, parts
(wheel, etc.) and damage the paint.
■High pressure car washes
As water may enter the cabin, do not bring
the nozzle tip near the gaps around the
doors or perimeter of the windows, or spray
these areas continuously.
■When using a car wash
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 following correction
procedures to wash the vehicle:
●Place the key in a position 6 ft. (2 m) or
more separate from the vehicle while the
vehicle is being wash ed. (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.100)
■Wheels and wheel ornaments (vehicles
without matte black painted wheels)
●Remove any dirt immediately by using a
neutral detergent.
●Wash detergent off with water immedi-
ately after use.
●To protect the paint from damage, make
sure to observe the following precau-
tions.
• Do not use acidic, alkaline or abrasive
detergent
• Do not use hard brushes
• Do not use detergent on the wheels when they are hot, such as after driving or park-
ing in hot weather
■Wheels and wheel ornaments (vehicles
with matte black painted wheels)
As matte black painted wheels require dif-
ferent cleaning methods than conventional
aluminum wheels, be sure to observer the
following. For details, consult your Lexus
dealer.
Cleaning and protecting the
vehicle exterior
Perform the following to protect
the vehicle and maintain it in prime
condition:
Cleaning instructions

3016-3. Do-it-yourself maintenance
6
Maintenance and care
Check the battery as follows.
■Battery exterior
Make sure that the battery terminals
are not corroded and that there are no
loose connections, cracks, or loose
clamps.
Terminals
Hold-down clamp
■Before recharging
When recharging, the battery produces
hydrogen gas which is flammable and
explosive. Therefore, observe the following
before recharging:
●If recharging with the battery installed on
the vehicle, be sure to disconnect the
ground cable.
●Make sure the power switch on the char-
ger is off when connecting and discon-
necting the charger cables to the battery.
■After recharging/reconnecting the bat-
tery
The engine may not start. Follow the proce-
dure below to initialize the system.
1 Shift the shift lever to P.
2 Open and close any of the doors.
3 Restart the engine.
●Unlocking the doors using the smart
access system with pu sh-button start may
not be possible immediately after recon-
necting the battery. If this happens, use
the wireless remote control or the
mechanical key to lo ck/unlock the doors.
●Start the engine with the engine switch in
ACCESSORY mode. The engine may
not start with the engine switch turned off.
However, the engine will operate nor-
mally from the second attempt.
●The engine switch mode is recorded by
the vehicle. If the battery is disconnected
and reconnected, the vehicle will return
the engine switch mode to the status it
was in before the battery was discon-
nected. Make sure to turn off the engine
before disconnecting the battery. Take
extra care when connecting the battery if
the engine switch mode prior to the bat-
tery being disconnected is unknown.
If the system will not start even after multiple
attempts, contact your Lexus dealer.
NOTICE
■If the fluid level is low or high
It is normal for the brake fluid level to go
down slightly as the brake pads wear out
or when the fluid level in the accumulator
is high.
If the reservoir need s frequent refilling,
there may be a serious problem.
Battery
A
B
WARNING
■Chemicals in the battery
Batteries contain poisonous and corro-
sive sulfuric acid and may produce
hydrogen gas which is flammable and
explosive. To reduce the risk of death or
serious injury, take the following precau-
tions while working on or near the bat-
tery:
●Do not cause sparks by touching the
battery terminals with tools.
●Do not smoke or light a match near the
battery.
●Avoid contact with eyes, skin and
clothes.

3166-3. Do-it-yourself maintenance
When an air conditioning odor comes out
continuously, replace the air conditioning
filter.
■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 operationa l range will be reduced.
■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.
 Flathead screwdriver
 Small 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
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.
As the key may be damaged if the
following procedure is not per-
formed properly, it is recom-
mended that key battery
replacement be performed by your
Lexus dealer.
Items to prepare

3176-3. Do-it-yourself maintenance
6
Maintenance and care
1Take out the mechanical key.
2 Remove the cover.
To prevent damage to the key, wrap the tip
of the screwdriver with tape.
3Remove the depleted battery.
Insert a new battery with the “+” terminal
facing up.
Replacing the battery
WARNING
■Battery precautions
Observe the following precautions. Fail-
ure to do so may result in death or seri-
ous injury.
●Do not swallow the battery. Doing so
may cause chemical burns.
●A coin battery or button battery is
used in the electronic key. If a battery is
swallowed, it may cause severe chemi-
cal burns in as little as 2 hours and may
result in death or serious injury.
●Keep away new and removed batteries
from children.
●If the cover cannot be firmly closed,
stop using the electronic key and stow
the key in the place where children
cannot reach, and then contact your
Lexus dealer.
●If you accidentally swallow a battery or
put a battery into a part of your body,
get emergency medical attention
immediately.
■To prevent battery explosion or leak-
age of flammable liquid or gas
●Replace the battery with a new battery
of the same type. If a wrong type of
battery is used, it may explode.
●Do not expose batteries to extremely
low pressure due to high altitude or
extremely high temperatures.
●Do not burn, break or cut a battery.
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.

327
7
7
When trouble arises
When trouble arises
.7-1. Essential informationEmergency flashers.................. 328
If your vehicle has to be stopped in an emergency .......................... 328
If the vehicle is trapped in rising water............................................ 329
7-2. Steps to take in an emergency If your vehicle needs to be towed......................................................... 331
If you think something is wrong ........................................................ 335
Fuel pump shut off system ..... 336
If a warning light turns on or a warning buzzer sounds ....... 337
If a warning message is displayed ........................................................ 346
If you have a flat tire.................. 349
If the engine wi ll not start .......357
If you lose your keys ................. 358
If the fuel filler door cannot be opened........................................ 359
If the electronic key does not operate properly .................... 359
If the vehicle battery is discharged ......................................................... 361
If your vehicle overheats ........ 365
If the vehicle becomes stuck ........................................................ 368