Get Driving -> Driving assist systems (Summary) Guide for Toyota bZ4X SUV Second Generation (2025-2026)

387

5-4. Using the driving support systems

■ VSC (Vehicle Stability Con-

Driving assist systems

trol)

Helps the driver to control skid-

ding when swerving suddenly or

turning on slippery road sur-

faces.

To keep driving safety and

performance, the following

systems operate automati-

cally in response to various

driving situations. Be

■ Trailer Sway Control

aware, however, that these

systems are supplementary

and should not be relied

upon too heavily when

Helps the driver to control trailer

sway by selectively applying

brake pressure for individual

wheels and reducing driving

torque when trailer sway is

detected.

operating the vehicle.

Summary of the driving

assist systems

■ TRAC (Traction Control)

Helps to maintain drive power

and prevent the drive wheels

from spinning when starting the

vehicle or accelerating on slip-

pery roads

■ ECB (Electronically Con-

trolled Brake System)

5

The electronically controlled

system generates braking force

corresponding to the brake

operation

■ Active Cornering Assist

(ACA)

Helps to prevent the vehicle

from drifting to the outer side by

performing inner wheel brake

control when attempting to

accelerate while turning

■ ABS (Anti-lock Brake Sys-

tem)

Helps to prevent wheel lock

when the brakes are applied

suddenly, or if the brakes are

applied while driving on a slip-

pery road surface

■ Hill-start assist control

Helps to reduce the backward

movement of the vehicle when

starting on an uphill

■ Brake assist

Generates an increased level of

braking force after the brake

pedal is depressed when the

system detects a panic stop sit-

uation

■ EPS (Electric Power Steer-

ing)

Employs an electric motor to

reduce the amount of effort

needed to turn the steering

wheel.

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388

5-4. Using the driving support systems

■ The Secondary Collision

Brake

When the SRS airbag sensor

detects a collision and the sys-

tem operates, the brakes and

brake lights are automatically

controlled to reduce the vehicle

speed and help reduce the pos-

sibility of further damage due to

a secondary collision.

■Turning off both TRAC, VSC

and Trailer Sway Control sys-

tems

To turn the TRAC/VSC/Trailer Sway

Control systems off, press and hold

■When the

for more than 3 seconds while

the vehicle is stopped.

TRAC/VSC/ABS/Trailer Sway

Control systems are operating

The VSC OFF indicator light will

come on and the “Traction Control

Turned OFF” will be shown on the

The slip indicator light will flash

while the TRAC/VSC/ABS/Trailer

Sway Control systems are operat-

ing.

*

multi-information display.

Press

again to turn the systems

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.

■Disabling the TRAC system

(P.270)

If the vehicle gets stuck in mud, dirt

or snow, the TRAC system may

reduce power from the EV system to

the wheels.

■When the message is dis-

played on the multi-information

display showing that TRAC has

Pressing

to turn the system off

been disabled even if

not been pressed

TRAC is temporary deactivated. If

the information continues to show,

contact your Toyota dealer.

has

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

.

■Operating conditions of hill-

start assist control

The “Traction Control Turned OFF”

will be shown on the multi-informa-

tion display.

When all of the following conditions

are met, the hill-start assist control

will operate:

Press

again to turn the system

●The shift position is in a position

other than P or N (when starting

off forward/backward on an

back on.

Owners Manual_USA_M42C01_en

389

5-4. Using the driving support systems

upward incline)

motor compartment when the

brake pedal is operated.

●The vehicle is stopped

●Operating sound heard from the

motor compartment when one or

two minutes passed after the stop

of the EV system.

●The accelerator pedal is not

depressed

●The parking brake is not engaged

●Power switch is turned to ON

■Active Cornering Assist opera-

tion sounds and vibrations

■Automatic system cancelation

of hill-start assist control

When the Active Cornering Assist is

operated, operation sounds and

vibrations may be generated from

the brake system, but this is not a

malfunction.

The hill-start assist control will turn

off in any of the following situations:

●The shift position is shifted to P or

N

■EPS operation sound

●The accelerator pedal is

depressed

When the steering wheel is oper-

ated, a motor sound (whirring

sound) may be heard. This does not

indicate a malfunction.

●The brake pedal is depressed and

the parking brake is engaged

●A maximum of 2 seconds have

elapsed after the brake pedal is

released

■Automatic reactivation of

TRAC, Trailer Sway Control and

VSC systems

●Power switch is turned to OFF

After turning the TRAC, Trailer

5

■Sounds and vibrations caused

by the ABS, brake assist, VSC,

Trailer Sway Control, TRAC and

hill-start assist control systems

Sway Control and VSC systems off,

the systems will be automatically re-

enabled in the following situations:

●When the power switch is turned

off

●A sound may be heard from the

motor compartment when the

brake pedal is depressed repeat-

edly, when the EV system 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.

●If only the TRAC system is turned

off, the TRAC will turn on when

vehicle speed increases.

If both the TRAC and VSC sys-

tems are turned off, automatic re-

enabling will not occur when vehi-

cle speed increases

●Any of the following conditions

may occur when the above sys-

tems are operating. None of these

indicates that a malfunction has

occurred.

■Operating conditions of Active

Cornering Assist

The system operates when the fol-

lowing occurs.

• Vibrations may be felt through the

vehicle body and steering.

●TRAC/VSC can operate

●The driver is attempting to accel-

erate while turning

• A motor sound may be heard also

after the vehicle comes to a stop.

●The system detects that the vehi-

■ECB operating sound

cle is drifting to the outer side

ECB operating sound may be heard

in the following cases, but it does

not indicate that a malfunction has

occurred.

●The brake pedal is released

■Reduced effectiveness of the

EPS system

●Operating sound heard from the

The effectiveness of the EPS sys-

Owners Manual_USA_M42C01_en

390

5-4. Using the driving support systems

tem is reduced to prevent the sys-

tem from overheating when there is

frequent steering input over an

extended period of time. The steer-

ing wheel may feel heavy as a

result. Should this occur, refrain

from excessive steering input or

stop the vehicle and turn the EV

system off. The EPS system should

return to normal within 10 minutes.

■Stopping distance when the

ABS is operating may exceed

that of normal conditions

The ABS is not designed to

shorten the vehicle’s stopping dis-

tance. Always maintain a safe dis-

tance from the vehicle in front of

you, especially in the following sit-

uations:

●When driving on dirt, gravel or

snow-covered roads

■Secondary Collision Brake

operating conditions

The system operates when the SRS

airbag sensor detects a collision

while the vehicle is in motion. How-

ever, the system does not operate

when the components are dam-

aged.

●When driving with tire chains

●When driving over bumps in the

road

●When driving over roads with

potholes or uneven surfaces

■Secondary Collision Brake

automatic cancellation

■TRAC/VSC may not operate

effectively when

The system is automatically can-

celed in any of the following situa-

tions.

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 con-

ditions where stability and power

may be lost.

●The vehicle speed drops to

approximately 0 mph (0 km/h)

●A certain amount of time elapses

during operation

●The accelerator pedal is

depressed a large amount

■Active Cornering Assist does

not operate effectively when

●Do not overly rely on Active

Cornering Assist. Active Corner-

ing Assist may not operate

effectively when accelerating

down slopes or driving on slip-

pery road surfaces.

WARNING

■The ABS does not operate

effectively when

●The limits of tire gripping perfor-

mance have been exceeded

(such as excessively worn tires

on a snow covered road).

●When Active Cornering Assist

frequently operates, Active Cor-

nering Assist may temporarily

stop operating to ensure proper

operation of the brakes, TRAC

and VSC.

●The vehicle hydroplanes while

driving at high speed on wet or

slick roads.

■Hill-start assist control does

not operate effectively when

●Do not overly rely on hill-start

assist control. Hill-start assist

control may not operate effec-

tively on steep inclines and

roads covered with ice.

Owners Manual_USA_M42C01_en

391

5-4. Using the driving support systems

■Handling of tires and the sus-

pension

WARNING

●Unlike the parking brake, hill-

start assist control is not

intended to hold the vehicle sta-

tionary for an extended period

of time. Do not attempt to use

hill-start assist control to hold

the vehicle on an incline, as

doing so may lead to an acci-

dent.

Using tires with any kind of prob-

lem or modifying the suspension

will affect the driving assist sys-

tems, and may cause a system to

malfunction.

■Trailer Sway Control precau-

tion

The Trailer Sway Control system

is not able to reduce trailer sway

in all situations. Depending on

many factors such as the condi-

tions 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.

■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

■If trailer sway occurs

Observe the following precau-

tions.

Failing to do so may cause death

or serious injury.

5

Be especially careful and drive at

a speed appropriate to the road

conditions. As these are the sys-

tems to help ensure vehicle stabil-

ity and driving force, do not turn

the TRAC/VSC/Trailer Sway Con-

trol systems off unless necessary.

●Firmly grip the steering wheel.

Steer straight ahead. Do not try

to control trailer swaying by

turning the steering wheel.

Trailer Sway Control is part of the

VSC system and will not operate

if VSC is turned off or experiences

a malfunction.

●Begin releasing the accelerator

pedal immediately but very

gradually to reduce speed.

Do not increase speed. Do not

apply vehicle brakes.

■Replacing tires

Make sure that all tires are of the

specified size, brand, tread pat-

tern and total load capacity. In

addition, make sure that the tires

are inflated to the recommended

tire inflation pressure level.

If you make no extreme correction

with the steering or brakes, your

vehicle and trailer should stabi-

lize. (P.229)

The ABS, TRAC, VSC and Trailer

Sway Control systems will not

function correctly if different tires

are installed on the vehicle.

Contact your Toyota dealer for fur-

ther information when replacing

tires or wheels.

Owners Manual_USA_M42C01_en

392

5-4. Using the driving support systems

WARNING

■Secondary Collision Brake

Do not rely solely upon the Sec-

ondary Collision Brake. This sys-

tem is designed to help reduce

the possibility of further damage

due to a secondary collision, how-

ever, that effect changes accord-

ing to various conditions. Overly

relying on the system may result

in death or serious injury.

Owners Manual_USA_M42C01_en

Driving -> Driving assist systems (Summary) for Your Toyota bZ4X SUV Second Generation (2025-2026)

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