brake sensor LEXUS ES300h 2022 User Guide

2444-5. Using the driving support systems
Time
Hybrid system output restriction control begins operating
System determines that possibility of collision with detected object is high
Hybrid system output reduced
System determines that possibility of collision with detected object is extremely
high
Brake control begins operating
Brake control strength increased
Example: Multi-information display: “BRAKE!”
Example: Multi-information display: “Switch to Brake”
QIf the Parking Support Brake has oper-
ated
If the vehicle is stopped due to operation of
the Parking Support Brake, the Parking
Support Brake will be disabled and the
PKSB OFF indicator will illuminate. If the
Parking Support Brake operates unneces-
sarily, brake control can be canceled by
depressing the brake pedal or waiting for
approximately 2 seconds for it to automati-
cally be canceled. Then, the vehicle can be
operated by depressing the accelerator
pedal.
QRe-enabling the Parking Support Brake
To re-enable the Parking Support Brake
when it has been disabled due to system
operation, perform any of the following
operations. At this time, the PKSB OFF
indicator will turn off. ( P.74)
OTurn the PKSB system on ( P.241)
OTurn the power switch off, and then back
to ON mode
OShift the shift lever to P
ODrive with no operation targets in the
traveling direction of the vehicle
OChange the traveling direction of the
vehicle*
*
: Except the Parking Support Brake func- tion (rear pedestrian)
QIf “Parking Support Brake Unavailable”
is displayed on the multi-information
display and the PKSB OFF indicator is
flashing
If this message is displayed only when the
shift lever is in R, the rear camera lens may
be dirty. Clean the camera lens. If this mes-
sage is displayed when the shift lever is in
any position other than R, a sensor on the
front or rear bumper may be dirty. Clean
the sensors and their surrounding area on
the bumpers.
QIf “Parking Support Brake Unavailable”
and “Parking Assist Unavailable Clean
Parking Assist Sensor” are displayed on
the multi-information display and the
PKSB OFF indicator is flashing
OA sensor may be covered with ice, snow,
dirt, etc. In this case, remove the ice,
snow, dirt, etc., from the sensor to return
the system to normal. If this message is
shown even after removing dirt from the
sensor, or shown when the sensor was
not dirty to begin with, have the vehicle
inspected at your Lexus dealer.
OA sensor may be frozen. Once the ice
melts, the system will return to normal.
OWater may be continuously flowing over
the sensor surface, such as in a heavy
rain. When the system determines that it
is normal, the system will return to nor-
mal.
C
D
E
F
G
H
I
J
K

2464-5. Using the driving support systems
*: If equipped
This function will operate in situations such as the following if an object is detected
in the traveling direction of the vehicle.
QWhen traveling at a low speed and the brake pedal is not depressed, or is
depressed late
Parking Support Brake function (static objects)*
If the sensors detect a static object, such as a wall, in the traveling direction of
the vehicle and the system determines that a collision may occur due to the
vehicle suddenly moving forward due to an accidental accelerator pedal oper-
ation, the vehicle moving the unintended direction due to the wrong shift posi-
tion being selected, or while parking or traveling at low speeds, the system will
operate to lessen the impact with the de tected static object and reduce the
resulting damage.
Examples of function operation

2474-5. Using the driving support systems
4
Driving
QWhen the accelerator pedal is depressed excessively
QWhen the vehicle moves in the unintended direction due to the wrong shift
position being selected
 P.222
QThe Parking Support Brake function
(static object) will operate when
The function will operate when the PKSB
OFF indicator is not illuminated or flashing
Types of sensors
WARNING
QTo ensure the system can operate
properly
 P.224
QIf the Parking Support Brake function
(static objects) operates unnecessar-
ily, such as at a railroad crossing
 P.244
QNotes when washing the vehicle
 P.224

2494-5. Using the driving support systems
4
Driving
*: If equipped
This function will operate in situations such as the following if a vehicle is detected
in the traveling direction of the vehicle.
QWhen reversing, a vehicle is approaching and the brake pedal is not
depressed, or is depressed late
 P.215
QThe Parking Support Brake function
(rear-crossing vehicles) will operate
when
The function will operate when the PKSB
OFF indicator is not illuminated or flashing
(  P.73, 74) and all of the following condi-
tions are met:
OHybrid system output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is approximately 9
mph (15 km/h) or less.
• Vehicles are approaching from the right or left at the rear of the vehicle at a travel-
ing speed of approximately 5 mph (8
Parking Support Brake function (rear-crossing vehicles)*
If a rear radar sensor detects a vehicle approaching from the right or left at the
rear of the vehicle and the system determines that the possibility of a collision
is high, this function will perform brake control to reduce the likelihood of an
impact with the approaching vehicle.
Examples of function operation
Types of sensors
WARNING
QTo ensure the system can operate
properly
 P.215

2514-5. Using the driving support systems
4
Driving
*: If equipped
When a pedestrian is detected behind the vehicle while backing up, the brake
pedal is not depressed or is depressed late.
Displays a message to urge the driver
to take evasive action when a pedes-
trian is detected in the detection area
behind the vehicle. (A message will
also be displayed on the multi-informa-
tion display and head-up display (if
equipped).)Pedestrian detection icon
Brake reminder
Parking Support Brake function (rear pedestrians)*
If the rear camera sensor detects a pedestrian behind the vehicle while back-
ing up and the system determines that the possibility of colliding with the
detected pedestrian is high , a buzzer will sound. If the system determines that
the possibility of colliding with the dete cted pedestrian is extremely high, the
brakes will be applied automatically to help reduce the impact of the collision.
Examples of system operation
Center Display
A
B

2524-5. Using the driving support systems
QParking Support Brake function (rear
pedestrians) will operate when
The function will operate when the PKSB
OFF indicator is not illuminated or flashing
(  P.73, 74) and all of the following condi-
tions are met:
OHybrid system output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is 9 mph (15 km/h) or less.
• The shift position is in R.
• The rear camera sensor detects a pedes- trian behind the vehicle while backing up
and the system determines that the possi-
bility of colliding with the detected
pedestrian is high.
OBrake control
• Hybrid system output restriction control is operating.
• The Parking Support Brake determines that an emergency brake operation is
necessary to avoid a collision with a
pedestrian.
QThe Parking Support Brake function
(rear pedestrians) will stop operating
when
The function will stop operating if any of the
following conditions are met:
OHybrid system output restriction control
• The Parking Support Brake is disabled.
• The collision becomes avoidable with normal brake operation.
• The pedestrian is no longer detected
behind your vehicle.
OBrake control
• The Parking Support Brake is disabled.
•Approximately 2 se conds have elapsed
since the vehicle was stopped by brake
control.
• The brake pedal is depressed after the
vehicle is stopped by brake control.
• The pedestrian is no longer detected behind your vehicle.
QRe-enabling the Parking Support Brake
function (rear pedestrians)
 P.244
QDetection area of the Parking Support
Brake function (rear pedestrians)
The detection area of the Parking Support
Brake function (rear pedestrians) differs
from the detection area of the RCD func-
tion ( P.237). Therefore, even if the RCD
function detects a pedestrian and provides
an alert, the Parking Support Brake func-
tion (rear pedestrians) may not start operat-
ing.
QSituations in which the system may not
operate properly
 P.238
QSituations in which the system may
operate unexpectedly
 P.238
WARNING
QIf the Parking Support Brake function
(rear pedestrians) operates unneces-
sarily
Depress the brake pedal immediately
after the Parking Suppo rt Brake function
(rear pedestrians) operates. (Operation
of the function is canceled by depressing
the brake pedal.)
QCorrect use of the Parking Support
Brake function (rear pedestrians)
 P.236

2534-5. Using the driving support systems
4
Driving
QECB (Electronically Controlled
Brake System)
The electronically controlled system
generates braking force correspond-
ing to the brake operation
QABS (Anti-lock Brake System)
Helps to prevent wheel lock when the
brakes are applied suddenly, or if the
brakes are applied while driving on a
slippery road surface
QBrake assist
Generates an increased level of brak-
ing force after the brake pedal is
depressed when the system detects a
panic stop situation
QVSC (Vehicle Stability Control)
Helps the driver to control skidding
when swerving suddenly or turning on
slippery road surfaces.
QEnhanced VSC (Enhanced Vehi-
cle Stability Control)
Provides cooperative control of the
ABS, TRAC, VSC and EPS. Helps to maintain directional stability
when swerving on slippery road sur-
faces by controlling steering perfor-
mance.
QSecondary Collision Brake
When the SRS airbag sensor detects a
collision and the system operates, the
brakes and brake lights are automati-
cally controlled to reduce the vehicle
speed and help reduce the possibility
of further damage due to a secondary
collision
QTRAC (Traction Control)
Helps to maintain drive power and
prevent the drive wheels from spinning
when starting the vehicle or accelerat-
ing on slippery roads
QActive Cornering Assist (ACA)
Helps to prevent the vehicle from drift-
ing to the outer side by performing
inner wheel brake control when
attempting to accelerate while turning
QHill-start assist control
Helps to reduce the backward move-
ment of the vehicle when starting on an
uphill
QEPS (Electric Power Steering)
Employs an electric motor to reduce
the amount of effort needed to turn the
steering wheel
QAVS (Adaptive Variable Suspen-
sion system) (if equipped)
By independently controlling the
damping force of the shock absorbers
for each of the 4 wheels according to
the road and driving conditions, this
Driving assist systems
To keep driving safety and perfor-
mance, the following systems oper-
ate automatically in response to
various driving situations. Be
aware, however, that these systems
are supplementary and should not
be relied upon too heavily when
operating the vehicle.
Summary of the driving assist
systems

2554-5. Using the driving support systems
4
Driving
QSounds and vibrations caused by the
ABS, brake assist, VSC, TRAC and hill-
start assist control systems
OA sound may be heard from the engine
compartment when the brake pedal is
depressed repeatedly, when the hybrid
system is started or just after the vehicle
begins to move. This sound does not indi-
cate that a malfunction has occurred in
any of these systems.
OAny of the following conditions may
occur when the above systems are oper-
ating. None of these indicates that a mal-
function has occurred.
• Vibrations may be felt through the vehi- cle body and steering.
• A motor sound may be heard also after the vehicle comes to a stop.
QECB operating sound
ECB operating sound may be heard in the
following cases, but it does not indicate that
a malfunction has occurred.
OOperating sound heard from the engine
compartment when the brake pedal is
operated.
OMotor sound of the brake system heard
from the front part of the vehicle when
the driver’s door is opened.
OOperating sound heard from the engine
compartment when one or two minutes
passed after the stop of the hybrid sys-
tem.
QActive Cornering Assist operation
sounds and vibrations
When the Active Cornering Assist is oper-
ated, operation sounds and vibrations may
be generated from the brake system, but
this is not a malfunction.
QEPS operation sound
When the steering wheel is operated, a
motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
QAutomatic reactivation of TRAC and
VSC systems
After turning the TRAC and VSC systems
off, the systems will be automatically re-
enabled in the following situations:
OWhen the power switch is turned off
OIf only the TRAC system is turned off, the
TRAC will turn on when vehicle speed
increases
If both the TRAC and VSC systems are
turned off, automatic re-enabling will not
occur when vehicle speed increases.
QSecondary Collision Brake operating
conditions
The system operates when the SRS airbag
sensor detects a collision while the vehicle
is in motion.
However, the system does not operate
when the components are damaged.
QSecondary Collision Brake automatic
cancellation
The system is automatically canceled in any
of the following situations.
OThe vehicle speed drops to approxi-
mately 6 mph (10 km/h)
OA certain amount of time elapses during
operation
OThe accelerator pedal is depressed a
large amount
QOperating conditions of Active Corner-
ing Assist
The system operates when the following
occurs.
OTRAC/VSC can operate
OThe driver is attempting to accelerate
while turning
OThe system detects that the vehicle is
drifting to the outer side
OThe brake pedal is released
QReduced effectiveness of the EPS sys-
tem
The effectiveness of the EPS system is
reduced to prevent the system from over-
heating when there is frequent steering
input over an extended period of time. The
steering wheel may feel heavy as a result.
Should this occur, refrain from excessive
steering input or stop the vehicle and turn
the hybrid system off. The EPS system
should return to normal within 10 minutes.

3096-1. Maintenance and care
6
Maintenance and care
parking in hot weather
QBrake pads and calipers
Rust may form if the vehicle is parked with
wet brake pads or disc rotors, causing them
to stick. Before parking the vehicle after it is
washed, drive slowly and apply the brakes
several times to dry the parts.
QBumpers
Do not scrub with abrasive cleaners.
QFront side windows water-repellent
coating
OThe following precautions can extend the
effectiveness of the water-repellent coat-
ing.
• Remove any dirt, etc. from the front side
windows regularly.
• Do not allow dirt and dust to accumulate on the windows for a long period.
Clean the windows with a soft, damp
cloth as soon as possible.
• Do not use wax or glass cleaners that
contain abrasives when cleaning the win-
dows.
• Do not use any metallic objects to
remove condensation build up.
OWhen the water-repellent performance
has become insufficient, the coating can
be repaired. Contact your Lexus dealer.
QPlated portions
If dirt cannot be removed, clean the parts as
follows:
OUse a soft cloth dampened with an
approximately 5% solution of neutral
detergent and water to clean the dirt off.
OWipe the surface with a dry, soft cloth to
remove any remaining moisture.
OTo remove oily deposits, use alcohol wet
wipes or a similar product.
WARNING
QWhen washing the vehicle
Do not apply water to the inside of the
engine compartment. Doing so may
cause the electrical components etc. to
catch fire.
QWhen cleaning the windshield (vehi-
cles with rain-sensing windshield wip-
ers)
Set the wiper switch to off.
If the wiper switch is in “AUTO”, the wip-
ers may operate unexpectedly in the fol-
lowing situations, and may result in hands
being caught or other serious injuries
and cause damage to the wiper blades.
Off
AUTO
OWhen the upper part of the windshield
where the raindrop sensor is located is
touched by hand
OWhen a wet rag or similar is held close
to the raindrop sensor
OIf something bumps against the wind-
shield
OIf you directly touch the raindrop sen-
sor body or if something bumps into
the raindrop sensor
QPrecautions regarding the exhaust
pipes
As exhaust gases cause the exhaust
pipes to become quite hot, do not touch
the exhaust pipes while the hybrid system
is operating or immediately after the
hybrid system is turned off.
When washing the vehicle, be careful not
to touch the exhaust pipes until they have
cooled sufficiently, as touching hot
exhaust pipes can cause burns.
A
B

3697-2. Steps to take in an emergency
7
When trouble arises
QRCTA OFF indicator (warning buzzer)
QRCD OFF indicator (warning buzzer)
QPKSB OFF indicator (warning buzzer)
Warning lightDetails/Actions
(flashes)
When a buzzer sounds:
Indicates a malfunction in the RCTA (Rear Cross Traffic Alert) function
Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
Indicates that the rear bumper around the radar sensor is covered with
dirt, etc. ( P.215)
 Follow the instructions displayed on the multi-information display.
(  P.231)
Warning lightDetails/Actions
(flashes)
(if equipped)
When a buzzer sounds:
Indicates a malfunction in the RCD (Rear Camera Detection) function
 Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
Indicates that the function temporarily cannot be used due to the cam-
era being dirty, etc.
 Follow the instructions displayed on the multi-information display.
(  P.237, 374)
Warning lightDetails/Actions
(flashes)
(if equipped)
When a buzzer sounds:
Indicates a malfunction in the PKSB (Parking Support Brake) system
 Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.
 Follow the instructions displayed on the multi-information display.
(  P.244, 374)