key battery LEXUS RX450h 2021 User Guide

2014-3. Operating the lights and wipers
4
Driving
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 headlights are on: The head-
lights and tail lights turn off 30 seconds
after the driver’s door is opened and
closed if the power switch is turned to
ACCESSORY mode or turned off. (The
lights turn off immediately if on the
key is pressed after all the doors are
closed.)
●When only the tail lights are on: The tail
lights turn off automatically if the power
switch is turned to ACCESSORY mode
or turned off and the driver’s door is
opened.
■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.
■Light reminder buzzer
A buzzer sounds when the power switch is
turned off or turned to ACCESSORY
mode and the driver’s door is opened while
the lights are turned on.
■Welcome lighting
If the headlight switch is turned to and
the surrounding area is dark, unlocking the
doors using the smart access system with
push-button start or wireless remote con-
trol will turn the parking lights and tail lights
on automatically.
■Windshield wiper linked headlight illu-
mination
When driving during daytime with the
headlight switch turned to , if the wind-
shield wipers are used, the headlights will
turn on automatically after several seconds
to help enhance the visibility of your vehicle.
■12-volt battery-saving function
In order to prevent the 12-volt battery of the vehicle from discharging, if the headlights
and/or tail lights are on when the power
switch is turned off the 12-volt battery sav-
ing function will operate and automatically
turn off all the lights
after approximately 20
minutes. When the power switch is turned
to ON mode, the 12-volt battery-saving
function will be disabled.
When any of the following are performed,
the 12-volt battery-saving function is can-
celed once and then reactivated. All the
lights will turn off automatically 20 minutes
after the 12-volt battery-saving function has
been reactivated:
●When the headlight switch is operated
●When a door is opened or closed
■Customization
Some functions can be customized.
(  P.480)
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
NOTICE
■To prevent 12-volt battery discharge
Do not leave the lights on longer than
necessary when the hy brid system is off.
Turning on the high beam head-
lights

3225-4. 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 lights)
■Rear personal lights
Turns the lights on/off
■Illuminated entry system
The lights automatically turn on/off accord-
ing to the power switch mode, the presence
of the electronic key, whether the doors are
locked/unlocked, and whether the doors
are opened/closed.
■To prevent the 12-volt battery from
being discharged
If the interior lights remain on when the
power 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 20minutes.
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
Operating the personal lights
A
B

355
6
6
Maintenance and care
Maintenance and care
.6-1. Maintenance and careCleaning and protecting the vehi-cle exterior ................................ 356
Cleaning and protecting the vehi- cle interior ................................. 359
6-2. Maintenance Maintenance requirements........................................................ 362
General maintenance ............. 363
Emission inspection and mainte- nance (I/M) programs ......... 366
6-3. Do-it-yourself maintenance Do-it-yourself service precautions........................................................ 367
Hood............................................... 369
Positioning a floor jack............ 369
Engine compartment................ 371
12-volt battery............................. 376
Tires ................................................ 380
Tire inflation pressure .............. 387
Wheels........................................... 389
Air conditioning filter...............390
Windshield wiper inserts........ 392
Electronic key battery ............. 393
Checking and replacing fuses ........................................................ 395
Headlight aim.............................. 397
Light bulbs .................................... 399

3566-1. 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
●Before washing the vehicle:
• Fold the mirrors
• Turn off the power back door
Start washing from the front of the vehicle.
Extend the mirrors before driving.
●Brushes used in automatic car washes
may scratch the vehicle surface, parts
(wheel, etc.) and harm your vehicle’s
paint.
●Rear spoiler may not be washable in
some automatic car washes. There may
also be an increased risk of damage to
vehicle.
■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.126)
■Wheels and wheel ornaments
●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
Cleaning and protecting the
vehicle exterior
Perform cleaning in a manner
appropriate to each component
and its material.
Cleaning instructions

3776-3. Do-it-yourself maintenance
6
Maintenance and care
2Remove the cover after removing
the clips.
1 Press
2 Pull out
RX450hL
1 Remove the deck board and side
auxiliary box cover. ( P.332)
2 Remove the 12-volt battery cover.
3 Remove the deck side trim cover.
■Before recharging
When recharging, the 12-volt battery pro-
duces hydrogen gas which is flammable
and explosive. Therefore, observe the fol- lowing precautions before recharging:
●If recharging with the 12-volt battery
installed on the vehicle, be sure to discon-
nect the ground cable.
●Make sure the power switch on the char-
ger is off when connecting and discon-
necting the charger cables to the 12-volt
battery.
■After recharging/reconnecting the
12-volt battery
●The hybrid system may not start. Follow
the procedure below to initialize the sys-
tem.
1 Shift the shift lever to P.
2 Open and close any of the doors.
3 Restart the hybrid system.
●Unlocking the doors using the smart
access system with pu sh-button start may
not be possible immediately after recon-
necting the 12-volt battery. If this hap-
pens, use the wireless remote control or
the mechanical key to lock/unlock the
doors.
●Start the hybrid system with the power
switch in ACCESSORY mode. The
hybrid system may not start with the
power switch turned off. However, the
hybrid system will operate normally from
the second attempt.
●The power switch mode is recorded by
the vehicle. If the 12-volt battery is recon-
nected, the vehicle will return the power
switch mode to the stat us it was in before
the 12-volt battery was disconnected.
Make sure to turn off the power before
disconnect the 12-volt battery. Take extra
care when connecting the 12-volt battery
if the power switch mode prior to dis-
charge is unknown.
If the system will not start even after multiple
attempts at all the methods above, contact
your Lexus dealer.

3936-3. Do-it-yourself maintenance
6
Maintenance and care
■Replacing the rear wiper insert
Have the rear wiper inse rt replaced by your
Lexus dealer.
■Handling of the windshield wiper blades
and inserts
Improper handling of the windshield wiper
blades and inserts may cause them to be
damaged. If it is difficult to follow the wiper
blade and insert replacement procedure
precisely, contact your Lexus dealer.
■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.
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
the local laws.
1Take out the mechanical key.
2 Remove the cover.
To prevent damage to the key, cover the tip
Electronic key battery
Replace the battery with a new one
if it is depleted.
You will need the following items:
Replacing the battery

3946-3. Do-it-yourself maintenance
of the flathead screwdriver with a tape.
3Remove the depleted battery.
When removing the cover, the electronic
key module may stick to the cover and the
battery may not be visible. In this case,
remove the electronic key module in order
to remove the battery.
Insert a new battery with the “+” terminal
facing up.
WARNING
■Battery precautions
Observe the following precautions.
Failure to do so may result in death or
serious 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.

409
7
7
When trouble arises
When trouble arises
.7-1. Essential informationEmergency flashers................... 410
If your vehicle has to be stopped in an emergency ........................... 410
If the vehicle is trapped in rising water.............................................. 411
7-2. Steps to take in an emergency If your vehicle needs to be towed......................................................... 413
If you think something is wrong ......................................................... 417
If a warning light turns on or a warning buzzer sounds ........ 418
If a warning message is displayed ........................................................ 428
If you have a flat tire.................. 432
If the hybrid system will not start ........................................................ 444
If you lose your keys ................. 446
If the fuel filler door cannot be opened........................................ 446
If the electronic key does not operate properly .................... 447
If the 12-volt battery is discharged ........................................................ 449
If your vehicle overheats ........ 454
If the vehicle becomes stuck ........................................................ 457

4317-2. Steps to take in an emergency
7
When trouble arises
maintenance schedule*.
Comes on approximately 5000 miles
(8000 km) after the message has been
reset. (The indicator will not work properly
unless the message ha s been reset.) Per-
form the necessary maintenance. Please
reset the message after the maintenance is
performed. ( P.362)
*: Refer to the separa te “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.
■If “Oil Maintenance Required Soon” is
displayed
Indicates that the engine oil should be
scheduled to be changed.
Check the engine oil and change it if neces-
sary. After changing the engine oil, make
sure to reset the message. ( P.373)
■If “Oil Maintenance Required” is dis-
played
Indicates that the engine oil should be
changed.
Check and change the en gine oil, and oil fil-
ter by your Lexus deal er. After changing the
engine oil, make sure to reset the message.
(  P.373)
■If a message that in dicates the need for
visiting your Lexus dealer is displayed
The system or part shown on the
multi-information display is malfunctioning.
Have the vehicle inspected by your Lexus
dealer immediately.
■If a message that in dicates the need for
referring to Owner’s Manual is dis-
played
●“Engine Coolant Temp High” is shown on
the multi-information display, follow the
instructions. ( P.454)
●If any of the following messages are
shown on the multi-information display, it
may indicate a malfunction. Have the
vehicle inspected by your Lexus dealer
immediately.
• “Access System with Elec. Key Malfunc-
tion”
• “Hybrid System Malfunction” •“Check Engine”
• “Hybrid Battery System Malfunction”
• “Accelerator System Malfunction”
●If any of the following messages are
shown on the multi-info
rmation display, it
may indicate a malfun ction. Immediately
stop the vehicle and contact your Lexus
dealer.
• “Braking Power Low”
• “Charging System Malfunction”
• “Oil Pressure Low”
NOTICE
■If “High Power Consumption Partial
Limit On AC/Heater Operation” is
displayed frequently
There is a possible malfunction relating
to the charging system or the 12-volt bat-
tery may be deteriorating. Have the vehi-
cle inspected by your Lexus dealer.

4447-2. Steps to take in an emergency
One of the following may be the cause
of the problem:
The electronic key may not be func-
tioning properly. ( P.447)
 There may not be sufficient fuel in
the vehicle’s tank.
Refuel the vehicle.
 There may be a malfunction in the
immobilizer system. ( P.73)
 There may be a malfunction in the
steering lock system.
 The hybrid system may be malfunc-
tioning due to an electrical problem
such as electronic key battery
depletion or a blown fuse. However,
depending on the type of malfunc-
tion, an interim measure is available
to start the hybrid system. ( P.445)
One of the following may be the cause
NOTICE
■Proper storage of the spare tire
(RX450hL)
●If the hoist assembly is slanted when
stowing a tire, the hoist assembly may
become stuck in the wheel opening
and the tire may not be raised properly,
causing damage to the wheel or the
wire cable.
●If the spare tire clamp bolt is turned
without a tire on the hoist assembly, the
wire cable may not be able to be low-
ered. If the wire cable cannot be low-
ered, contact your Lexus dealer.
If the hybrid system will not
start
Reasons for the hybrid system not
starting vary depending on the situ-
ation. Check the following and per-
form the appropriate procedure:
The hybrid system will not start
even though the correct starting
procedure is being followed.
(  P.184)
The interior lights and head-
lights are dim, or the horn does
not sound or sounds at a low vol-
ume.