Content .. 12 13 14 15 ..

Lexus ES250 (2023 year). Manual in english - page 14

234

4-5. Using the driving support systems

Engine output

Braking force

Time

Engine output restriction control begins operating

System determines that possibility of collision with detected object is high

Engine output reduced

Example: Multi-information display:
“BRAKE!”



Figure 3 When brake control operates

Engine output

Braking force

A
B
C
D

E
F

A
B

235

4-5. Using the driving support systems

Driving

Time

Engine output restriction control begins operating

System determines that possibility of collision with detected object is high

Engine 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. (



P.66)

●

Turn the PKSB system on (



P.232)

●

Turn the engine switch off, and then back

to IGNITION ON mode

●

Shift the shift lever to P

●

Drive with no operation targets in the

traveling direction of the vehicle

●

Change the traveling direction of the
vehicle

: Except the Parking Support Brake func-

tion (rear pedestrian)

■

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 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.

■

If “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

●

A 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.

●

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.

C
D

E
F

236

4-5. Using the driving support systems

■

If a battery terminal has been discon-

nected 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.

237

4-5. Using the driving support systems

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 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
operation, the vehicle moving the unintended direction due to the wrong shift
position being selected, or while parking or traveling at low speeds, the sys-
tem will operate to lessen the impact with the detected static object and
reduce the resulting damage.

Examples of function operation

238

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
position being selected



P.213

■

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



P.215

■

If the Parking Support Brake function

(static objects) operates unnecessar-

ily, such as at a railroad crossing



P.235

■

Notes when washing the vehicle



P.215

239

4-5. Using the driving support systems

Driving

(



P.65, 66) and all of the following condi-

tions are met:

●

Engine 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 oper-

ation is necessary to avoid a collision.

●

Brake control

• Engine output restriction control is oper-

ating.

• The Parking Support Brake determines

that an immediate brake operation is

necessary 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:

●

Engine 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.218) 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 Parking Support

Brake function (static objects) may not

operate

When the shift lever is in N.

■

Situations in which the system may not

operate properly



P.216

■

Situations in which the system may

operate even if there is no possibility of a

collision



P.217

240

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



P.206

■

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.65, 66) and all of the following condi-

tions are met:

●

Engine 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 colli-
sion 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



P.206

241

4-5. Using the driving support systems

Driving

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

• Engine output restriction control is oper-

ating.

• 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 oper-

ating when

The function will stop operating if any of the

following conditions are met:

●

Engine 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.223). 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



P.216

■

Situations in which the system may

operate even if there is no possibility of a

collision



P.217

242

4-5. Using the driving support systems

: If equipped

When a pedestrian is detected behind the vehicle while backing up, the brake
pedal is not depressed or is depressed late.

A message to urge the driver to take
evasive action is automatically dis-
played on the Center Display when a
pedestrian is detected in the detection
area behind the vehicle.

Pedestrian detection icon

“BRAKE!”

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 detected pedestrian is extremely high, the
brakes will be applied automatically to help reduce the impact of the collision.

Examples of system operation

Display of rear pedestrians

A
B

243

4-5. Using the driving support systems

Driving

■

Parking Support Brake function (rear

pedestrians) will operate when

The function will operate when the PKSB

OFF indicator is not illuminated or flashing

(



P.65, 66) and all of the following condi-

tions are met:

●

Engine output restriction control

• The Parking Support Brake is enabled.

• The vehicle speed is 9 mph (15 km/h) or

less.

• The shift lever is in R.

• A pedestrian is at the rear of the vehicle.

• The PKSB (Parking Support Brake)

determines that a stronger-than-normal

brake operation is necessary to avoid a

collision.

●

Brake control

• Engine output restriction control is oper-

ating.

• The Parking Support Brake determines

that an emergency brake operation is

necessary to avoid a collision with a

pedestrian.

■

The Parking Support Brake function

(rear pedestrians) will stop operating

when

The function will stop operating if any of the

following conditions are met:

●

Engine 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.

●

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.

■

Re-enabling the Parking Support Brake

function (rear pedestrians)



P.235

■

Detection 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.228). 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.

■

Situations in which the system may not

operate properly



P.228

■

Situations in which the system may

operate unexpectedly



P.229

WARNING

■

If the Parking Support Brake function

(rear pedestrians) operates unneces-

sarily

Depress the brake pedal immediately

after the Parking Support Brake function

(rear pedestrians) operates. (Operation

of the function is canceled by depressing

the brake pedal.)

■

Correct use of the Parking Support

Brake function (rear pedestrians)



P.227

244

4-5. Using the driving support systems

■

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.
Helps to maintain directional stability
when swerving on slippery road sur-
faces by controlling steering perfor-
mance.

■

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.

■

TRAC (Traction Control)

Helps to maintain drive power and
prevent 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

■

Dynamic Torque Control AWD
system (AWD models)

Automatically switches from front-
wheel drive to all-wheel drive (AWD)
according to the driving conditions,
helping to ensure reliable handling 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.

■

EPS (Electric Power Steering)

Employs an electric motor to reduce
the amount of effort needed to turn the

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

245

4-5. Using the driving support systems

Driving

steering wheel

■

AVS (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
system helps riding comfort with supe-
rior vehicle stability, and helps good
vehicle posture.
Also, the damping force changes
depending on the selected driving
mode. (



P.210)

■

When the TRAC/VSC systems are

operating

The slip indicator light will flash while the

TRAC/VSC systems are operating.

■

Disabling the TRAC system

If the vehicle gets stuck in mud, dirt or snow,
the TRAC system may reduce power from
the engine 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

system back on.

■

Turning off both TRAC and VSC sys-

tems

To turn the TRAC and VSC 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

system back on.

: PCS (Pre-Collision System) 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.
(



P.183)

■

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

information continues to show, contact your

Lexus dealer.

■

Operating conditions of hill-start assist

control

When all of the following 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.

246

4-5. Using the driving support systems

■

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, TRAC and hill-

start assist control systems

●

A sound may be heard from the engine

compartment when the brake pedal is

depressed repeatedly, when the engine is

started or just after the vehicle begins to

move. This sound does not indicate 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.

• 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.

• The brake pedal may pulsate slightly after

the ABS is activated.

• The brake pedal may move down slightly

after the ABS is activated.

■

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.

■

Automatic 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:

●

When the engine 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.

■

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

when the components are damaged.

■

Secondary Collision Brake automatic

cancellation

The system is automatically canceled in any

of the following situations.

●

The vehicle speed drops to approxi-

mately 6 mph (10 km/h)

●

A certain amount of time elapses during

operation

●

The accelerator pedal is depressed a

large amount

■

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

■

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 engine off. The EPS system should

return to normal within 10 minutes.

■

If a message about AWD is shown on the multi-information display

Perform the following actions.

247

4-5. Using the driving support systems

Driving

Message

Details/Actions

“AWD System Overheated
Switching to 2WD Mode”

AWD system is overheating.



Perform the following actions.



Reduce the vehicle speed until the message disappears.



Stop the vehicle in a safe place and let the engine idle.

Once the display message on the multi-information display
turns off, there is no problem continuing to drive.
If the message does not disappear, have your vehicle
checked by your Lexus dealer immediately.

“AWD System Overheated
2WD Mode Engaged”

The vehicle switched from all-wheel drive (AWD) to front
wheel drive due to overheating.



Perform the following actions.



Reduce the vehicle speed until the message disappears.



Stop the vehicle in a safe place and let the engine idle.

Once the display message on the multi-information display
turns off, the AWD system returns to normal.
If the message does not disappear, have your vehicle
checked by your Lexus dealer immediately.

“AWD System Malfunction
2WD Mode Engaged Visit
Your Dealer”

A malfunction occurred in the AWD system.



Have your vehicle checked by your Lexus dealer imme-
diately.

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.

■

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

maintain 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 pot-

holes 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.

248

4-5. Using the driving support systems

WARNING

■

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/VSC 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 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 systems off

unless necessary.

■

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.

■

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 and VSC systems will

not function correctly 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.

249

4-6. Driving tips

Driving

4-6.Driving tips



Use fluids that are appropriate to
the prevailing outside temperatures.

• Engine oil
• Engine coolant
• Washer fluid



Have a service technician inspect
the condition of the battery.



Have the vehicle fitted with four
snow tires or purchase a set of tire
chains for the front tires.

Ensure that all tires are the specified size
and brand, and that chains match the size
of the tires.

: Tire chains cannot be mounted on vehi-

cles with 18-inch/19-inch tires.

Perform the following according to the
driving conditions:



Do not try to forcibly open a window

Winter driving tips

Carry out the necessary prepara-
tions and inspections before driving
the vehicle in winter. Always drive
the vehicle in a manner appropriate
to the prevailing weather condi-
tions.

Preparation for winter

WARNING

■

Driving with snow tires

Observe the following precautions to

reduce the risk of accidents.

Failure to do so may result in a loss of

vehicle control and cause death or seri-

ous injury.

●

Use tires of the specified size.

●

Maintain the recommended level of air

pressure.

●

Do not drive in excess of 75 mph (120

km/h), regardless of the type of snow

tires being used.

●

Use snow tires on all, not just some

wheels.

■

Driving with tire chains (vehicles with

17-inch tires)

Observe the following precautions to

reduce the risk of accidents.
Failure to do so may result in the vehicle

being unable to be driven safely, and may

cause death or serious injury.

●

Do not drive in excess of the speed

limit specified for the tire chains being

used, or 30 mph (50 km/h), which-

ever is lower.

●

Avoid driving on bumpy road surfaces

or over potholes.

●

Avoid sudden acceleration, abrupt

steering, sudden braking and shifting

operations that cause sudden engine

braking.

●

Slow down sufficiently before entering

a curve to ensure that vehicle control

is maintained.

●

Do not use LTA (Lane Tracing Assist)

system.

NOTICE

■

Repairing or replacing snow tires

Request repairs or replacement of snow

tires from Lexus dealers or legitimate tire

retailers.

This is because the removal and attach-

ment of snow tires affects the operation

of the tire pressure warning valves and

transmitters.

Before driving the vehicle

Content .. 12 13 14 15 ..