engine overheat LEXUS RCF 2021 Owners Manual

4TABLE OF CONTENTS
Hood..................................................264
Positioning a floor jack............... 265
Engine compartment.................. 267
Tires ................................................... 273
Tire inflation pressure ................. 279
Wheels............................................... 281
Air conditioning filter..................282
Electronic key battery ................ 283
Checking and replacing fuses ........................................................... 285
Headlight aim................................. 287
Light bulbs ....................................... 288
7-1. Essential information Emergency flashers..................... 294
If your vehicle has to be stopped in an emergency ............................. 294
If the vehicle is trapped in rising water............................................... 295
7-2. Steps to take in an emergency If your vehicle needs to be towed........................................................... 297
If you think something is wrong ........................................................... 300
Fuel pump shut off system ......... 301
If a warning light turns on or a warn- ing buzzer sounds ..................... 302
If a warning message is displayed ............................................................ 310
If you have a flat tire (vehicles with a spare tire) ...................................... 313
If you have a flat tire (vehicles with an emergency tire puncture
repair kit) ....................................... 319
If the engine wi ll not start .......... 329If you lose your keys.....................
331
If the fuel filler door cannot be opened ........................................... 331
If the electronic key does not oper- ate properly ................................. 332
If the vehicle battery is discharged .......................................................... 334
If your vehicle overheats ........... 337
If the vehicle becomes stuck ... 339
8-1. Specifications Maintenance data (fuel, oil level, etc.) ................................................. 342
Fuel information............................ 349
Tire information ............................. 351
8-2. Customization Customizable features .............. 360
8-3. Items to initialize Items to initialize ........................... 369
8-4. Certifications Certifications ................................. 370
9-1. For owners Reporting safety defects for U.S. owners ........................................... 380
Seat belt instructions for Canadian owners (in French) ................... 380
SRS airbag instructions for Cana- dian owners (in French) ......... 382
Headlight aim instructions for Canadian owners (in French)... .......

................................................ 388
7When trouble arises
8Vehicle specifications
9For owners

13Pictorial index
Windshield wipers .................................................................................................. P.143
Precautions for winter season ..................................................................................... P.204
To prevent freezing (windshield wiper de-icer)
*................................................... P.217
Precautions against car wash ............................. ......................................................... P.242
Fuel filler door ..........................................................................................................P.150
Refueling method .............................................................................................................. P .150
Fuel type/fuel tank capacity ...... ................................................................................... P.343
Tires.......................................................................................................................... ..P.273
Tire size/inflation pressure ............................ ............................................................... P.347
Winter tires.......................................................................................................................... P.204
Checking/rotation/tire pressure warning system.............................................. P.273
Coping with flat tires............................................................................................... P.313, 319
Hood .......................................................................................................................... P.264
Opening ........................................................................................................................ ....... P.264
Engine oil ..................................................................................................................... ......... P.343
Coping with overheating ............................................................................................... P.337
Warning messages ........................................................................................................... P.31 0
Active rear wing
*.................................................................................................... P.195
Headlights .................................................................................................................P.13 8
Parking lights/daytime running lights...............................................................P.138
Turn signal lights ...................................................................................................... P.136
Side marker lights ...................................................................................................P.138
Tail lights .................................................................................................................... P.138
Stop lights
License plate lights .................................................................................................P.138
Back up lights
Shifting the shift lever to R .............................................................................................. P.13 3
*:If equipped
Light bulbs of the exterior lights for driving(Replacing method: P.288, Watts: P.348)
D
E
F
G
H
I
J
K
L
M
N
O

722-1. Instrument cluster
changed suddenly (at the entrance/exit of
a garage, tunnel, etc.)
●When “_ _” or “E” is displayed, the system
may be malfunctioning.
Take your vehicle to your Lexus dealer.
■Pop-up display
●In some situations, such as when a switch
operation is performed, a pop-up display
will be temporarily displayed on the
multi-information display.
●Some pop-up displays can be set on/off.
(  P.81)
■Liquid crystal display
Small spots or light spots may appear on the
display. This phenomenon is characteristic
of liquid crystal displays, and there is no
problem continuing to use the display.
■Customization
The meter display can be customized on
the multi-information display. ( P.360)
■Display items
 Odometer
Displays the total distance the vehicle has
been driven.
Trip meter A/trip meter B
Displays the distance the vehicle has been
driven since the meter was last reset. Trip
meters A and B can be used to record and
display different distances independently.
To reset, display the desired trip meter and
press and hold the odometer/trip meter
and trip meter reset button.
■Changing the display
Each time the “ODO TRIP” switch is
pressed, the displayed item will be
changed. When the trip meter is dis-
played, pressing and holding the switch
WARNING
■The information display at low tem-
peratures
Allow the interior of the vehicle to warm
up before using the liquid crystal infor-
mation display. At extremely low tem-
peratures, the in formation display
monitor may respond slowly, and display
changes may be delayed.
For example, there is a lag between the
driver’s shifting and the new gear number
appearing on the display. This lag could
cause the driver to downshift again,
causing rapid and excessive engine brak-
ing and possibly an accident resulting in
death or injury.
NOTICE
■To prevent damage to the engine and
its components
●Do not let the indicator of the tachom-
eter enter the red zone, as it rep-
resents the engine speed range which
exceeds the maximum safe engine
speed.
●In the following situations, the engine
may be overheating. In this case,
immediately stop the vehicle in a safe
place, and check the engine after it has
cooled completely. ( P.337)
• The engine coolant temperature gauge indicator ( ) is in the red
zone and flashing.
• The engine oil temperature gauge indicator ( ) is in the red zone and
flashing.
Odometer and trip meter dis-
play

1204-1. Before driving
WARNING
●During normal driving, do not turn off
the engine. Turning the engine off
while driving will not cause loss of
steering or braking control, but the
power assist to these systems will be
lost. This will make it more difficult to
steer and brake, so you should pull
over and stop the vehicle as soon as it
is safe to do so.
However, in the event of an emer-
gency, such as if it becomes impossible
to stop the vehicle in the normal way:
P.294
●Use engine braking (downshift) to
maintain a safe speed when driving
down a steep hill.
Using the brakes continuously may
cause the brakes to overheat and lose
effectiveness. (
P.132)
●Do not adjust the positions of the
steering wheel, the seat, or the inside
or outside rear view mirrors while driv-
ing.
Doing so may result in a loss of vehicle
control.
●Always check that all passengers’
arms, heads or other parts of their
body are not outside the vehicle.
●Do not drive in excess of the speed
limit. Even if the legal speed limit per-
mits it, do not drive over 85 mph (140
km/h) unless your vehicle has
high-speed capability tires. Driving
over 85 mph (140 km/h) may result in
tire failure, loss of control and possible
injury. Be sure to consult a tire dealer
to determine whether the tires on your
vehicle are high-speed capability tires
or not before driving at such speeds.
■When driving on slippery road sur-
faces
●Sudden braking, acceleration and
steering may cause tire slippage and
reduce your ability to control the vehi-
cle.
●Sudden acceleration, engine braking
due to shifting, or changes in engine
speed could cause the vehicle to skid.
●After driving through a puddle, lightly
depress the brake pedal to make sure
that the brakes are functioning prop-
erly. Wet brake pads may prevent the
brakes from functioning properly. If the
brakes on only one side are wet and
not functioning properly, steering con-
trol may be affected.
■When shifting the shift lever
●Do not let the vehicle roll backward
while the shift lever is in a driving posi-
tion, or roll forward while the shift lever
is in R.
Doing so may cause the engine to stall
or lead to poor brake and steering
performance, resulting in an accident
or damage to the vehicle.
●Do not shift the shift lever to P while
the vehicle is moving.
Doing so can damage the transmission
and may result in a loss of vehicle con-
trol.
●Do not shift the shift lever to a driving
position while the vehicle is moving
backward.
Doing so can damage the transmission
and may result in a loss of vehicle con-
trol.
●Do not shift the shift lever to R while
the vehicle is moving forward.
Doing so can damage the transmission
and may result in a loss of vehicle con-
trol.
●Moving the shift lever to N while the
vehicle is moving will disengage the
engine from the transmission. Engine
braking is not available when N is
selected.

1214-1. Before driving
4
Driving
WARNING
●Be careful not to shift the shift lever
with the accelerator pedal depressed.
Shifting the shift lever to a gear other
than P or N may lead to unexpected
rapid acceleration of the vehicle that
may cause an accident and result in
death or serious injury.
■If a brake pad wear warning message
is displayed
Have the brake pads visually checked
and replaced by your Lexus dealer as
soon as possible.
Rotor damage may result if the pads are
not replaced when needed.
Moderate levels of the brake pad and
disc wear allow enha nced braking power.
As a result, the discs may wear more
quickly than conventional brake discs.
Therefore, when replacing the brake
pads, Lexus recommends that you also
have the thickness of the discs measured.
It is dangerous to drive the vehicle when
the wear limits of the brake pads and/or
those of the brake discs are exceeded.
■When the vehicle is stopped
●Do not race the engine.
If the vehicle is in any gear other than P
or N, the vehicle may accelerate sud-
denly and unexpectedly, causing an
accident.
●In order to prevent accidents due to
the vehicle rolling away, always keep
depressing the brake pedal while the
engine is running, and apply the park-
ing brake as necessary.
●If the vehicle is stopped on an incline,
in order to prevent accidents caused
by the vehicle rolling forward or back-
ward, always depress the brake pedal
and securely apply the parking brake
as needed.
●Avoid revving or racing the engine.
Running the engine at high speed
while the vehicle is stopped may cause
the exhaust system to overheat, which
could result in a fire if combustible
material is nearby.
■When the vehicle is parked
●Do not leave glasses, cigarette lighters,
spray cans, or soft drink cans in the
vehicle when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter or spray can, and may lead to a fire.
• The temperature inside the vehicle may cause the plastic lenses and plas-
tic material of glasses to deform or
crack.
• Soft drink cans may fracture, causing the contents to spray over the interior
of the vehicle, and may also cause a
short circuit in the vehicle’s electrical
components.
●Do not leave cigarette lighters in the
vehicle. If a cigare tte lighter is in a
place such as the glove box or on the
floor, it may be lit accidentally when
luggage is loaded or the seat is
adjusted, causing a fire.
●Do not attach adhesive discs to the
windshield or windows. Do not place
containers such as air fresheners on
the instrument panel or dashboard.
Adhesive discs or containers may act
as lenses, causing a fire in the vehicle.
●Do not leave a door or window open if
the curved glass is coated with a met-
allized film such as a silver-colored
one. Reflected sunlight may cause the
glass to act as a lens, causing a fire.

1224-1. Before driving
WARNING
●Always apply the parking brake, shift
the shift lever to P, stop the engine and
lock the vehicle.
Do not leave the vehicle unattended
while the engine is running.
If the vehicle is parked with the shift
lever in P but the parking brake is not
set, the vehicle may start to move, pos-
sibly leading to an accident.
●Do not touch the exhaust pipes while
the engine is running or immediately
after turning the engine off.
Doing so may cause burns.
■When taking a nap in the vehicle
Always turn the engine off. Otherwise, if
you accidentally move the shift lever or
depress the accelerator pedal, this could
cause an accident or fire due to engine
overheating. Additionally, if the vehicle is
parked in a poorly ventilated area,
exhaust gases may collect and enter the
vehicle, leading to death or a serious
health hazard.
■When braking
●When the brakes are wet, drive more
cautiously.
Braking distance increases when the
brakes are wet, and this may cause one
side of the vehicle to brake differently
than the other side. Also, the parking
brake may not securely hold the vehi-
cle.
●If the brake booster device does not
operate, do not follow other vehicles
closely and avoid hills or sharp turns
that require braking.
In this case, braking is still possible, but
the brake pedal should be depressed
more firmly than usual. Also, the brak-
ing distance will increase. Have your
brakes fixed immediately.
●Do not pump the brake pedal if the
engine stalls.
Each push on the brake pedal uses up
the reserve for the power-assisted
brakes.
●The brake system consists of 2 individ-
ual hydraulic systems; if one of the sys-
tems fails, the other w ill still operate. In
this case, the brak e pedal should be
depressed more firmly than usual and
the braking distance will increase.
Have your brakes fixed immediately.
For vehicles equipped with carbon
ceramic brakes (CCB), in situations such
as the following, braking performance
may be temporarily reduced:
●When the brake pads or brake discs
have recently been replaced
●When the brakes are wet, such as after
washing the vehicle or when driving
through water or snow
●When the temperature of the brake
discs is low
If the wheels become full of snow, such as
when driving through deep snow, ice
may become stuck between a brake pad
and disk and braking performance may
be reduced.
Drive with sufficient space between your
vehicle and preceding vehicles, at a
moderate speed and depress the brake
more firmly than normal when decelerat-
ing.
■If the vehicle becomes stuck
Do not spin the wheels excessively when
a driven wheel is up in the air, or the vehi-
cle is stuck in sand, mud, etc. This may
damage the driveline components or
propel the vehicle forward or backward,
causing an accident.
NOTICE
■When driving the vehicle
●Do not depress the accelerator and
brake pedals at th e same time while
driving, as this may restrain the engine
output.

1284-2. 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 necessary 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
●The engine immobilizer system may not have been deactivated. (
P.57)
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.
■Electronic key battery depletion
 P.88
■Conditions affecting operation
 P.100
■Notes for the entry function
 P.100
■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, “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 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.
■Electronic key battery
 P.283
■Operation of the engine switch
●If the switch is no t pressed shortly and
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

1374-2. Driving procedures
4
Driving
To set the parking brake, fully depress
the parking brake pedal with your left
foot while depressing the brake pedal
with your right foot.
(Depressing the pedal again releases
the parking brake.)U.S.A.
Canada
■Parking the vehicle
 P.118
■Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven
with the parking brake engaged. “Release
Parking Brake” is displayed on the
multi-information display.
■Usage in winter time
 P.205
*:if equipped
■The ASC system can be operated when
The driving mode select switch is in SPORT
S+ mode. ( P.192)
Parking brake
Operating instructions
NOTICE
■Before driving
Fully release the parking brake.
Driving the vehicle with the parking
brake set will lead to brake components
overheating, which may affect braking
performance and increase brake wear.
A
B
ASC (Active Sound Con-
trol)
*
The ASC system sonically empha-
sizes the vehicle’s response to the
driver’s operation of the accelera-
tor pedal and shift lever or paddle
shift switches. The dynamic engine
sound enabled by this system helps
the driver further enjoy the feeling
of unity with the vehicle, particu-
larly when driving in M mode.
(  P.135)

2225-2. Using the air conditioning system
light as follows:
Hi (3 segments lit) Mid (2 segments
lit)  Lo (1 segment lit) Off
■Operation condition
The engine switch is in IGNITION ON
mode.
■Seat heater timer control
To enable seat heater timer control, press
and hold the driver and front passenger
seat heater switches at the same time when
the vehicle is stopped until a buzzer sounds
once. If a seat heater is turned on while seat
heater timer control is enabled, the intensity
of the seat heater wi ll automatically change
from Hi Mid Lo.
The timing of the change in seat heater
intensity differs depending on the tempera-
ture inside the cabin, etc. when the seat
heater is operating.
To disable seat heater timer control, press
and hold the driver and front passenger
seat heater switches at the same time until a
buzzer sounds twice.
Each time the switch is pressed, the
intensity of the seat ventilator changes
and the level indicator lights (green)
light as follows:
Hi (3 segments lit) Mid (2 segments
lit)  Lo (1 segment lit) Off
■Operation condition
The engine switch is in IGNITION ON
mode.
WARNING
■To prevent overheating and minor
burn injuries
Observe the following precautions when
using the seat heaters.
●Do not cover the seat with a blanket or
cushion when using the seat heater.
●Do not use seat heater more than nec-
essary.
ASeat ventilators
A

293
7
7
When trouble arises
When trouble arises
.7-1. Essential informationEmergency flashers.................. 294
If your vehicle has to be stopped in an emergency .......................... 294
If the vehicle is trapped in rising water............................................ 295
7-2. Steps to take in an emergency If your vehicle needs to be towed........................................................ 297
If you think something is wrong ........................................................ 300
Fuel pump shut off system ...... 301
If a warning light turns on or a warning buzzer sounds ....... 302
If a warning message is displayed ......................................................... 310
If you have a flat tire (vehicles with a spare tire) ................................ 313
If you have a flat tire (vehicles with an emergency tire puncture
repair kit) .................................... 319
If the engine wi ll not start .......329
If you lose your keys .................. 331
If the fuel filler door cannot be opened......................................... 331
If the electronic key does not operate properly .................... 332
If the vehicle battery is discharged ........................................................ 334
If your vehicle overheats ........ 337
If the vehicle becomes stuck ........................................................ 339