Lexus RX450h (2022 year). Manual in english — page 16
268
4-5. Using the driving support systems
Hybrid system output
Braking force
Time
Figure 2 When hybrid system output restriction control operates
Hybrid system output
Braking force
Time
Hybrid system output restriction control begins operating
System determines that possibility of collision with detected object is high
Hybrid system output reduced
Example: Multi-information display: “BRAKE!”
Figure 3 When brake control operates
A
B
C
A
B
C
D
E
F
G
269
4-5. Using the driving support systems
4
Driving
Hybrid system output
Braking force
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”
■
If 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.
■
Re-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. (
●
Turn the PKSB (Parking Support Brake)
on (
●
The shift lever is in P.
●
Drive with no operation targets in the
traveling direction of the vehicle
●
Change the traveling direction of the
vehicle
A
B
C
D
E
F
G
H
I
J
K
270
4-5. Using the driving support systems
■
If “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 any position other than R, a
sensor on the front or rear bumper may be
dirty. Clean the sensors and their surround-
ing area on the bumpers.
■
If “Parking Assist Unavailable” and
“Parking Assist Unavailable Clean
Parking Assist Sensor” are displayed on
the multi-information display and the
PKSB OFF indicator is flashing
●
A sensor may be covered with ice, snow,
dirt, etc. 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 by your
Lexus dealer.
●
A sensor may be frozen. Once the ice
melts, the system will return to normal.
●
Water 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.
■
If a 12-volt battery terminal has been
disconnected and reconnected
The system needs to be initialized. To initial-
ize the system, drive the vehicle straight
ahead for 5 seconds or more at a speed of
approximately 22 mph (35 km/h) or more.
Additionally, for vehicles with the Parking
Support Brake function, turn the steering
wheel fully to the left and right with the vehi-
cle stopped.
271
4-5. Using the driving support systems
4
Driving
*
: If equipped
This function will operate in situations such as the following if an object is detected
in the traveling direction of the vehicle.
■
When 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 travelling 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 lever
position, or while parking or traveling at low speeds, the system will operate to
lessen the impact with the detected static object and reduce the resulting
damage.
Examples of function operation
272
4-5. Using the driving support systems
■
When the accelerator pedal is depressed excessively
■
When the vehicle moves in the unintended direction due to the wrong shift
lever position
■
The 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
■
To ensure the system can operate
properly
■
If the Parking Support Brake function
(static objects) operates unnecessar-
ily, such as at a railroad crossing
■
Notes when washing the vehicle
273
4-5. Using the driving support systems
4
Driving
(
P.79, 80) and all of the following condi-
tions are met:
●
Hybrid system output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is approximately 9
mph (15 km/h) or less.
• There is a static object in the traveling
direction of the vehicle and approxi-
mately 6 to 13 ft. (2 to 4 m) away.
• The Parking Support Brake determines
that a stronger-than-normal brake opera-
tion is necessary to avoid a collision.
●
Brake control
• Hybrid system output restriction control
is operating.
• The Parking Support Brake determines
that an immediate brake operation is nec-
essary to avoid a collision.
■
The Parking Support Brake function
(static objects) will stop operating when
The function will stop operating if any of the
following conditions are met:
●
Hybrid system output restriction control
• The Parking Support Brake is disabled.
• The system determines that the collision
has become avoidable with normal brake
operation.
• The static object is no longer approxi-
mately 6 to 13 ft. (2 to 4 m) away from the
vehicle or in the traveling direction of the
vehicle.
●
Brake control
• The Parking Support Brake is disabled.
• Approximately 2 seconds have elapsed
since the vehicle was stopped by brake
control.
• The brake pedal is depressed after the
vehicle is stopped by brake control.
• The static object is no longer approxi-
mately 6 to 13 ft. (2 to 4 m) away from the
vehicle or in the traveling direction of the
vehicle.
■
Detection range of the Parking Support
Brake function (static objects)
The detection range of the Parking Support
Brake function (static objects) differs from
the detection range of the intuitive parking
assist. (
P.256) Therefore, even if the intu-
itive parking assist detects an object and
provides a warning, the Parking Support
Brake function (static objects) may not start
operating.
■
Situations in which the system may not
operate properly
■
Situations in which the system may
operate even if there is no possibility of a
collision
274
4-5. Using the driving support systems
*
: If equipped
This function will operate in situations such as the following if a vehicle is detected
in the traveling direction of the vehicle.
■
When reversing, a vehicle is approaching and the brake pedal is not
depressed, or is depressed late
■
The 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.79, 80) and all of the following condi-
tions are met:
●
Hybrid system output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is approximately 9
mph (15 km/h) or less.
• Vehicles which are approaching from the
right or left at the rear of the vehicle at a
traveling speed of approximately 5 mph
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
■
To ensure the system can operate
properly
275
4-5. Using the driving support systems
4
Driving
(8 km/h) or more.
• The shift lever is in R.
• The Parking Support Brake determines
that a stronger than normal brake opera-
tion is necessary to avoid a collision with
an approaching vehicle.
●
Brake 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 an
approaching vehicle.
■
The Parking Support Brake function
(rear-crossing vehicles) will stop operat-
ing when
The function will stop operating if any of the
following conditions are met:
●
Hybrid system output restriction control
• The Parking Support Brake is disabled.
• The collision becomes avoidable with
normal brake operation.
• A vehicle is no longer approaching from
the right or left at the rear of the vehicle.
●
Brake control
• The Parking Support Brake is disabled.
• Approximately 2 seconds have elapsed
since the vehicle was stopped by brake
control.
• The brake pedal is depressed after the
vehicle is stopped by brake control.
• A vehicle is no longer approaching from
the right or left at the rear of the vehicle.
■
Detection area of the Parking Support
Brake function (rear-crossing vehicles)
The detection area of the Parking Support
Brake function (rear-crossing vehicles) dif-
fers from the detection area of the RCTA
function (
P.261). Therefore, even if the
RCTA function detects a vehicle and pro-
vides an alert, the Parking Support Brake
function (rear-crossing vehicles) may not
start operating.
■
Situations in which the system may not
operate properly
■
Situations in which the system may
operate even if there is no possibility of a
collision
276
4-5. Using the driving support systems
Except F SPORT models
1
Normal mode
Provides an optimal balance of fuel econ-
omy, quietness, and dynamic performance.
Suitable for city driving.
Press the switch to change the driving
mode to normal mode when Eco drive
mode or sport mode is selected.
2
Eco drive mode
Helps the driver accelerate in an
eco-friendly manner and improve fuel
economy through moderate throttle char-
acteristics and by controlling the operation
of the air conditioning system (heat-
ing/cooling).
When not in Eco drive mode, if the driving
mode select switch is turned to the left, the
Eco drive mode indicator will come on.
3
Sport mode
Controls the hybrid system to provide
quick, powerful acceleration. This mode
also changes the steering feel, making it
suitable for when agile driving response is
desired, such as when driving on roads
with many curves.
When not in sport mode, if the driving
mode select switch is turned to the right,
the “Sport” indicator will comes on.
F SPORT models (vehicles with
Adaptive Variable Suspension Sys-
tem)
1
Normal mode/Custom mode
Normal mode and custom mode are
selected by pressing the driving mode
select switch. Each time the switch is
pressed, the driving mode changes
between normal mode and custom mode.
When custom mode is selected, the “Cus-
tom” indicator will be illuminated.
When Eco drive mode or sport mode is
Driving mode select switch
The driving modes can be selected
to suit driving conditions.
Selecting a drive mode
277
4-5. Using the driving support systems
4
Driving
selected, pressing the switch changes the
driving mode to normal mode.
• Normal mode
Provides an optimal balance of fuel econ-
omy, quietness, and dynamic performance.
Suitable for city driving.
• Custom mode
Allows you to drive with the following func-
tions set to your preferred settings. Cus-
tom mode settings can only be changed on
the drive mode customization display of
the Center Display. (
2
Eco drive mode
Helps the driver accelerate in an
eco-friendly manner and improve fuel
economy through moderate throttle char-
acteristics and by controlling the operation
of the air conditioning system (heat-
ing/cooling).
When not in Eco drive mode, if the driving
mode select switch is turned to the left, the
Eco drive mode indicator will come on.
3
Sport mode
• Sport S mode
Controls the hybrid system to provide
quick, powerful acceleration. This mode is
suitable for when agile driving response is
desired, such as when driving on roads
with many curves.
When not in Sport S mode, if the driving
mode select switch is turned to the right,
the “Sport S” indicator will come on.
• Sport S+ mode
Helps to ensure steering performance and
driving stability by simultaneously con-
trolling the steering and suspension in
addition to the hybrid system. Suitable for
sportier driving.
When in Sport S mode, if the driving mode
select switch is turned to the right, the
“Sport S+” indicator will come on.
F SPORT models (vehicles without
Adaptive Variable Suspension Sys-
tem)
1
Normal mode
Provides an optimal balance of fuel econ-
omy, quietness, and dynamic performance.
Suitable for city driving.
Press the switch to change the driving
mode to normal mode when Eco drive
mode or sport mode is selected.
2
Eco drive mode
Helps the driver accelerate in an
eco-friendly manner and improve fuel
Function
Setting
Powertrain
Normal
Power
Eco
Chassis
Normal
Sport
Air conditioning sys-
tem
Normal
Eco
278
4-5. Using the driving support systems
economy through moderate throttle char-
acteristics and by controlling the operation
of the air conditioning system (heat-
ing/cooling).
When not in Eco drive mode, if the driving
mode select switch is turned to the left, the
Eco drive mode indicator will come on.
3
Sport mode
Controls the hybrid system to provide
quick, powerful acceleration. This mode
also changes the steering feel, making it
suitable for when agile driving response is
desired, such as when driving on roads
with many curves.
When not in sport mode, if the driving
mode select switch is turned to the right,
the “Sport” indicator will comes on.
■
Operation of the air conditioning sys-
tem in Eco drive mode
Eco drive mode controls the heating/cool-
ing operations and fan speed of the air con-
ditioning system to enhance fuel efficiency.
To improve air conditioning performance,
adjust the fan speed or turn off Eco drive
mode.
■
Automatic deactivation of sport mode
and custom mode
If the power switch is turned off after driving
in sport mode or custom mode, the drive
mode will be changed to normal mode.
■
Driving mode pop-up display (12.3-inch
display only)
When the driving mode is changed, the
selected driving mode will be temporarily
displayed on the side display. (
■
ECB (Electronically Controlled
Brake System)
The electronically controlled system
generates braking force correspond-
ing to the brake operation
■
ABS (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
■
Brake assist
Generates an increased level of brak-
ing force after the brake pedal is
depressed when the system detects a
panic stop situation
■
VSC (Vehicle Stability Control)
Helps the driver to control skidding
when swerving suddenly or turning on
slippery road surfaces
■
Enhanced VSC (Enhanced Vehi-
cle Stability Control)
Provides cooperative control of the
ABS, TRAC, VSC and EPS.
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 oper-
ating the vehicle.
Summary of the driving assist
systems
279
4-5. Using the driving support systems
4
Driving
Helps to maintain directional stability
when swerving on slippery road sur-
faces by controlling steering perfor-
mance.
■
Trailer Sway Control (if equipped)
Helps the driver to control trailer sway
by selectively applying brake pressure
for individual wheels and reducing
driving torque when trailer sway is
detected.
■
TRAC (Traction Control)
Helps to maintain drive power and pre-
vent the drive wheels from spinning
when starting the vehicle or accelerat-
ing on slippery roads
■
Active 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
■
Hill-start assist control
Helps to reduce the backward move-
ment of the vehicle when starting on an
uphill
■
EPS (Electric Power Steering)
Employs an electric motor to reduce
the amount of effort needed to turn the
steering wheel
■
E-Four
Electronic On-Demand AWD system.
Automatically switches from
front-wheel drive to all-wheel drive
(AWD) according to the driving condi-
tions, helping to ensure reliable han-
dling and stability. Examples of
conditions where the system will switch
to AWD are when cornering, going
uphill, starting off or accelerating, and
when the road surface is slippery due
to snow, rain, etc.
■
Adaptive Variable Suspension Sys-
tem (if equipped)
Controls the damping force of the
shock absorber of each wheel accord-
ing to the road and driving conditions,
helping achieve a comfortable ride,
excellent driveability and a high level of
stability.
If Sport S+ mode is selected using the
driving mode select switch, the damp-
ing force will become more suitable for
sporty driving. (
■
VDIM (Vehicle Dynamics Inte-
grated Management)
Provides integrated control of the
ABS, brake assist, TRAC, VSC,
hill-start assist control and EPS systems
Helps to maintain vehicle stability when
swerving on slippery road surfaces by
controlling the brakes, hybrid system
output and steering assist.
■
The Secondary 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.
■
When the TRAC/VSC/ABS/Trailer
Sway Control systems are operating
The slip indicator light will flash while the
TRAC/VSC/ABS/Trailer Sway Control
systems are operating.
280
4-5. Using the driving support systems
■
Disabling the TRAC system
If the vehicle gets stuck in mud, dirt or snow,
the TRAC system may reduce power from
the hybrid system to the wheels. Pressing
the
switch to turn the system off may
make it easier for you to rock the vehicle in
order to free it.
To turn the TRAC system off, quickly press
and release the
switch.
The “Traction Control Turned Off” will be
shown on the multi-information display.
Press the
switch again to turn the sys-
tem back on.
■
Turning off both TRAC, VSC and Trailer
Sway Control systems
To turn the TRAC, VSC and Trailer Sway
Control systems off, press and hold the
switch for more than 3 seconds while
the vehicle is stopped.
The VSC OFF indicator light will come on
and the “Traction Control Turned Off” will
be shown on the multi-information display.
*
Press the
switch again to turn the sys-
tem back on.
*
: On vehicles with PCS (Pre-Collision
System), PCS will also be disabled (only
Pre-Collision warning is available). The
PCS warning light will come on and a
message will be displayed on the
multi-information display. (
■
When the message is displayed on the
multi-information display showing that
TRAC has been disabled even if the
switch has not been pressed
TRAC is temporary deactivated. If the infor-
mation continues to show, contact your
Lexus dealer.
■
Operating conditions of hill-start assist
control
When the following four conditions are met,
the hill-start assist control will operate:
●
The shift lever is in a position other than P
or N (when starting off forward/back-
ward on an upward incline)
●
The vehicle is stopped
●
The accelerator pedal is not depressed
●
The parking brake is not engaged
■
Automatic system cancelation of
hill-start assist control
The hill-start assist control will turn off in any
of the following situations:
●
The shift lever is shifted to P or N
●
The accelerator pedal is depressed
●
The parking brake is engaged
●
2 seconds at maximum elapsed after the
brake pedal is released
■
Sounds and vibrations caused by the
ABS, brake assist, VSC, Trailer Sway
Control, TRAC and hill-start assist con-
trol systems
●
A 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.
●
Any of the following conditions may
occur when the above systems are oper-
ating. None of these indicates that a mal-
function has occurred.
281
4-5. Using the driving support systems
4
Driving
• Vibrations may be felt through the vehicle
body and steering.
• A motor sound may be heard also after
the vehicle comes to a stop.
■
ECB operating sound
ECB operating sound may be heard in the
following cases, but it does not indicate that
a malfunction has occurred.
●
Operating sound heard from the engine
compartment when the brake pedal is
operated.
●
Motor sound of the brake system heard
from the front part of the vehicle when
the driver’s door is opened.
●
Operating sound heard from the engine
compartment when one or two minutes
passed after the stop of the hybrid sys-
tem.
■
Active 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.
■
EPS operation sound
When the steering wheel is operated, a
motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
■
Reduced 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.
■
Automatic reactivation of TRAC, Trailer
Sway Control and VSC systems
After turning the TRAC, Trailer Sway Con-
trol and VSC systems off, the systems will
be automatically re-enabled in the following
situations:
●
When the power switch is turned off
●
If 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.
■
Operating conditions of Active Corner-
ing Assist
The system operates when the following
occurs.
●
TRAC/VSC can operate
●
The driver is attempting to accelerate
while turning
●
The system detects that the vehicle is
drifting to the outer side
●
The brake pedal is released
■
Secondary 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 in
any of the following situations.
●
The vehicle speed is below 6 mph (10
km/h)
●
Components are damaged
■
Secondary Collision Brake automatic
cancellation
The system is automatically canceled in any
of the following situations.
●
The vehicle speed drops below approxi-
mately 6 mph (10 km/h)
●
A certain amount of time elapses during
operation
●
The accelerator pedal is depressed a
large amount
WARNING
■
The ABS does not operate effectively
when
●
The limits of tire gripping performance
have been exceeded (such as exces-
sively worn tires on a snow covered
road).
●
The vehicle hydroplanes while driving
at high speed on wet or slick roads.
282
4-5. Using the driving support systems
WARNING
■
Stopping distance when the ABS is
operating may exceed that of normal
conditions
The ABS is not designed to shorten the
vehicle’s stopping distance. Always main-
tain a safe distance from the vehicle in
front of you, especially in the following
situations:
●
When driving on dirt, gravel or
snow-covered roads
●
When driving with tire chains
●
When driving over bumps in the road
●
When driving over roads with potholes
or uneven surfaces
■
TRAC/VSC may not operate effec-
tively when
Directional control and power may not
be achievable while driving on slippery
road surfaces, even if the TRAC/VSC
system is operating. Drive the vehicle
carefully in conditions where stability and
power may be lost.
■
Active Cornering Assist does not
operate effectively when
●
Do not overly rely on Active Corner-
ing Assist. Active Cornering Assist
may not operate effectively when
accelerating down slopes or driving on
slippery road surfaces.
●
When Active Cornering Assist fre-
quently operates, Active Cornering
Assist may temporarily stop operating
to ensure proper operation of the
brakes, TRAC and VSC.
■
Hill-start assist control does not oper-
ate effectively when
●
Do not overly rely on hill-start assist
control. Hill-start assist control may
not operate effectively on steep
inclines and roads covered with ice.
●
Unlike the parking brake, hill-start
assist control is not intended to hold
the vehicle stationary for an extended
period of time. Do not attempt to use
hill-start assist control to hold the vehi-
cle on an incline, as doing so may lead
to an accident.
■
When the TRAC/ABS/VSC/Trailer
Sway Control is activated
The slip indicator light flashes. Always
drive carefully. Reckless driving may
cause an accident. Exercise particular
care when the indicator light flashes.
■
When the TRAC/VSC/Trailer Sway
Control systems are turned off
●
Be especially careful and drive at a
speed appropriate to the road condi-
tions. As these are the systems to help
ensure vehicle stability and driving
force, do not turn the
TRAC/VSC/Trailer Sway Control sys-
tems off unless necessary.
●
Trailer Sway Control is part of the VSC
system and will not operate if VSC is
turned off or experiences a malfunc-
tion.
■
Replacing tires
Make sure that all tires are of the speci-
fied size, brand, tread pattern and total
load capacity. In addition, make sure that
the tires are inflated to the recom-
mended tire inflation pressure level.
The ABS, TRAC, Trailer Sway Control
and VSC systems will not function cor-
rectly if different tires are installed on the
vehicle.
Contact your Lexus dealer for further
information when replacing tires or
wheels.
■
Handling of tires and the suspension
Using tires with any kind of problem or
modifying the suspension will affect the
driving assist systems, and may cause a
system to malfunction.
283
4-5. Using the driving support systems
4
Driving
WARNING
■
Trailer Sway Control precaution
The Trailer Sway Control system is not
able to reduce trailer sway in all situa-
tions. Depending on many factors such
as the conditions of the vehicle, trailer,
road surface and driving environment,
the Trailer Sway Control system may not
be effective. Refer to your trailer owner’s
manual for information on how to tow
your trailer properly.
■
If trailer sway occurs
Observe the following precautions.
Failing to do so may cause death or seri-
ous injury.
●
Firmly grip the steering wheel. Steer
straight ahead. Do not try to control
trailer sway by turning the steering
wheel.
●
Begin releasing the accelerator pedal
immediately but very gradually to
reduce speed.
Do not increase speed. Do not apply
vehicle brakes.
If you make no extreme correction with
the steering or brakes, your vehicle and
trailer should stabilize.
■
Secondary Collision Brake
Do not rely solely upon the Secondary
Collision Brake. This system is designed
to help reduce the possibility of further
damage due to a secondary collision,
however, that effect changes according
to various conditions. Overly relying on
the system may result in death or serious
injury.
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