Toyota Mirai (2023 year). Manual in english

227

5-5. Using the driving support systems

ing

(road sign, billboard, etc.)

• When approaching an electric toll

gate barrier, parking area barrier,

or other barrier that opens and

closes

• When using an automatic car

wash

• When driving through or under

objects that may contact your

vehicle, such as thick grass, tree

branches, or a banner

• When driving through steam or

smoke

• When driving near an object that

reflects radio waves, such as a

large truck or guardrail

• When driving near a TV tower,

broadcasting station, electric

power plant, radar equipped vehi-

cles, etc., or other location where

strong radio waves or electrical

noise may be present

• When there are many things

which can reflect the radio waves

of the radar in the vicinity (tunnels,

truss bridges, gravel roads, snow

covered road that have tracks,

etc.)

• While making a right/left turn,

when an oncoming vehicle or a

crossing pedestrian has already

exited the path of your vehicle

• While making a right/left turn,

closely in front of an oncoming

vehicle or a crossing pedestrian.

• While making a right/left turn,

when an oncoming vehicle or a

crossing pedestrian stops before

entering the path of your vehicle

• While making a right/left turn,

when an oncoming vehicle turns

right/left in front of your vehicle

• While steering into the direction of

oncoming traffic

■

Situations in which the system

may not operate properly

●

In some situations such as the fol-

lowing, an object may not be

detected by the radar sensor and

front camera, preventing the sys-

tem from operating properly:

• When a detectable object is

approaching your vehicle

• When your vehicle or a detectable

object is wobbling

• If a detectable object makes an

abrupt maneuver (such as sudden

swerving, acceleration or deceler-

ation)

• When your vehicle approaches a

detectable object rapidly

• When a detectable object is not

directly in front of your vehicle

• When a detectable object is near

a wall, fence, guardrail, manhole

cover, vehicle, steel plate on the

road, etc.

• When a detectable object is under

a structure

228

5-5. Using the driving support systems

• When part of a detectable object

is hidden by an object, such as

large baggage, an umbrella, or

guardrail

• When there are many things

which can reflect the radio waves

of the radar in the vicinity (tunnels,

truss bridges, gravel roads, snow

covered road that have tracks,

etc.)

• When there is an effect on the

radio waves to the radar that is

installed on another vehicle

• When multiple detectable objects

are close together

• If the sun or other light is shining

directly on a detectable object

• When a detectable object is a

shade of white and looks

extremely bright

• When a detectable object appears

to be nearly the same color or

brightness as its surroundings

• If a detectable object cuts or sud-

denly emerges in front of your

vehicle

• When the front of your vehicle is

hit by water, snow, dust, etc.

• When a very bright light ahead,

such as the sun or the headlights

of oncoming traffic, shines directly

into the front camera

• When approaching the side or

front of a vehicle ahead

• If a vehicle ahead is a motorcycle

• If a vehicle ahead is narrow, such

as a personal mobility vehicle

• If a preceding vehicle has a small

rear end, such as an unloaded

truck

• If a preceding vehicle has a low

rear end, such as a low bed trailer

• If a vehicle ahead has extremely

high ground clearance

• If a vehicle ahead is carrying a

load which protrudes past its rear

bumper

• If a vehicle ahead is irregularly

shaped, such as a tractor or side

car

• If a vehicle ahead is a child sized

bicycle, a bicycle that is carrying a

large load, a bicycle ridden by

more than one person, or a

uniquely shaped bicycle (bicycle

with a child seat, tandem bicycle,

etc.)

• If a pedestrian/or the riding height

of a bicyclist ahead is shorter than

approximately 3.2 ft. (1 m) or taller

than approximately 6.5 ft. (2 m)

• If a pedestrian/bicyclist is wearing

oversized clothing (a rain coat,

long skirt, etc.), making their sil-

houette obscure

• If a pedestrian is bending forward

or squatting or bicyclist is bending

forward

• If a pedestrian/bicyclist is moving

fast

• If a pedestrian is pushing a

stroller, wheelchair, bicycle or

other vehicle

• When driving in inclement weather

such as heavy rain, fog, snow or a

sandstorm

• When driving through steam or

smoke

• When the surrounding area is dim,

such as at dawn or dusk, or while

at night or in a tunnel, making a

detectable object appear to be

nearly the same color as its sur-

roundings

• When driving in a place where the

surrounding brightness changes

suddenly, such as at the entrance

or exit of a tunnel

• After the fuel cell system has

229

5-5. Using the driving support systems

ing

started the vehicle has not been

driven for a certain amount of time

• While making a left/right turn and

for a few seconds after making a

left/right turn

• While driving on a curve and for a

few seconds after driving on a

curve

• If your vehicle is skidding

• If the front of the vehicle is raised

or lowered

• If the wheels are misaligned

• If a wiper blade is blocking the

front camera

• The vehicle is being driven at

extremely high speeds

• When driving on a hill

• If the radar sensor or front camera

is misaligned

• When driving in a traffic lane sep-

arated by more than one lane

where oncoming vehicles are driv-

ing while making a right/left turn

• When largely out of place with the

opposite facing targeted oncom-

ing vehicle during a right/left turn

• While making a right/left turn,

when a pedestrian approaches

from behind or side of your vehicle

●

In addition to the above, in some

situations, such as the following,

the emergency steering assist

may not operate.

• When the white (yellow) lane lines

are difficult to see, such as when

they are faint, diverging/merging,

or a shadow is cast upon them

• When the lane is wider or nar-

rower than normal

• When there is a light and dark pat-

tern on the road surface, such as

due to road repairs

• When the target is too close

• When there is insufficient safe or

unobstructed space for the vehicle

to be steered into

• If oncoming vehicle is present

• If VSC function is operating

●

In some situations such as the fol-

lowing, sufficient braking force or

steering force may not be

obtained, preventing the system

from performing properly:

• If the braking functions cannot

operate to their full extent, such as

when the brake parts are

extremely cold, extremely hot, or

wet

• If the vehicle is not properly main-

tained (brakes or tires are exces-

sively worn, improper tire inflation

pressure, etc.)

• When the vehicle is being driven

on a gravel road or other slippery

surface

• When the road surface has deep

wheel tracks

• When driving on a hill road

• When driving on a road that has

inclines to the left or right

230

5-5. Using the driving support systems

■

If VSC is disabled

●

If VSC is disabled (



P.323), the

pre-collision brake assist and pre-

collision braking functions are also

disabled.

●

The PCS warning light will turn on

and “VSC Turned OFF Pre-Colli-

sion Brake System Unavailable”

will be displayed on the multi-

information display.

: Vehicles with Toyota Teammate

Advanced Drive, refer to “Toyota
Teammate Advanced Drive
OWNER’S MANUAL”.

While driving on a road with
clear white (yellow) lane lines,
the LTA system warns the driver
if the vehicle may deviate from
the current lane or course

, and

also can slightly operate the
steering wheel to help avoid
deviation from the lane or
course

. Also, while the dynamic

radar cruise control with full-
speed range is operating, this
system will operate the steering
wheel to maintain the vehicle’s
lane position.
The LTA system recognizes
white (yellow) lane lines or a
course

using the front camera.

Additionally, it detects preceding
vehicles using the front camera
and radar.

: Boundary between asphalt and

the side of the road, such as
grass, soil, or a curb

LTA (Lane Tracing

Assist)

Summary of functions

231

5-5. Using the driving support systems

ing

WARNING

■

Before using LTA system

●

Do not rely solely upon the LTA

system. The LTA system does

not automatically drive the vehi-

cle or reduce the amount of

attention that must be paid to

the area in front of the vehicle.

The driver must always assume

full responsibility for driving

safely by paying careful atten-

tion to the surrounding condi-

tions and operating the steering

wheel to correct the path of the

vehicle. Also, the driver must

take adequate breaks when

fatigued, such as from driving

for a long period of time.

●

Failure to perform appropriate

driving operations and pay care-

ful attention may lead to an

accident, resulting in death or

serious injury.

■

Situations unsuitable for LTA

system

In the following situations, use the

LTA switch to turn the system off.

Failure to do so may lead to an

accident, resulting in death or

serious injury.

●

Vehicle is driven on a road sur-

face which is slippery due to

rainy weather, fallen snow,

freezing, etc.

●

Vehicle is driven on a snow-cov-

ered road.

●

White (yellow) lines are difficult

to see due to rain, snow, fog,

dust, etc.

●

Vehicle is driven in a temporary

lane or restricted lane due to

construction work.

●

Vehicle is driven in a construc-

tion zone.

●

A spare tire, tire chains, etc.,

are equipped.

●

When the tires have been

excessively worn, or when the

tire inflation pressure is low.

●

During emergency towing.

■

Preventing LTA system mal-

functions and operations per-

formed by mistake

●

Do not modify the headlights or

place stickers, etc., on the sur-

face of the lights.

●

Do not modify the suspension,

etc. If the suspension, etc.,

needs to be replaced, contact

your Toyota dealer.

●

Do not install or place anything

on the hood or grille. Also, do

not install a grille guard (bull

bars, kangaroo bar, etc.).

●

If your windshield needs

repairs, contact your Toyota

dealer.

■

Conditions in which functions

may not operate properly

In the following situations, the

functions may not operate prop-

erly and the vehicle may depart

from its lane. Drive safely by

always paying careful attention to

your surroundings and operate

the steering wheel to correct the

path of the vehicle without relying

solely on the functions.

232

5-5. Using the driving support systems

WARNING

●

When the follow-up cruising dis-

play is displayed (



P.236) and

the preceding vehicle changes

lanes. (Your vehicle may follow

the preceding vehicle and also

change lanes.)

●

When the follow-up cruising dis-

play is displayed (



P.236) and

the preceding vehicle is sway-

ing. (Your vehicle may sway

accordingly and depart from the

lane.)

●

When the follow-up cruising dis-

play is displayed (



P.236) and

the preceding vehicle departs

from its lane. (Your vehicle may

follow the preceding vehicle and

depart from the lane.)

●

When the follow-up cruising dis-

play is displayed (



P.236) and

the preceding vehicle is being

driven extremely close to the

left/right lane line. (Your vehicle

may follow the preceding vehi-

cle and depart from the lane.)

●

Vehicle is being driven around a

sharp curve.

●

Objects or patterns that could

be mistaken for white (yellow)

lines are present on the side of

the road (guardrails, reflective

poles, etc.).

●

Vehicle is driven where the road

diverges, merges, etc.

●

Repair marks of asphalt, white

(yellow) lines, etc., are present

due to road repair.

●

There are shadows on the road

that run parallel with, or cover,

the white (yellow) lines.

233

5-5. Using the driving support systems

ing

WARNING

●

The vehicle is driven in an area

without white (yellow) lines,

such as in front of a tollgate or

checkpoint, or at an intersec-

tion, etc.

●

The white (yellow) lines are

cracked, “Botts’ dots”, “Raised

pavement marker” or stones are

present.

●

The white (yellow) lines cannot

be seen or are difficult to see

due to sand, etc.

●

The vehicle is driven on a road

surface that is wet due to rain,

puddles, etc.

●

The traffic lines are yellow

(which may be more difficult to

recognize than lines that are

white).

●

The white (yellow) lines cross

over a curb, etc.

●

The vehicle is driven on a bright

surface, such as concrete.

●

If the edge of the road is not

clear or straight.

●

The vehicle is driven on a sur-

face that is bright due to

reflected light, etc.

●

The vehicle is driven in an area

where the brightness changes

suddenly, such as at the

entrances and exits of tunnels,

etc.

●

Light from the headlights of an

oncoming vehicle, the sun, etc.,

enters the camera.

●

The vehicle is driven on a slope.

●

The vehicle is driven on a road

which tilts left or right, or a wind-

ing road.

●

The vehicle is driven on an

unpaved or rough road.

●

The traffic lane is excessively

narrow or wide.

●

The vehicle is extremely tilted

due to carrying heavy luggage

or having improper tire pres-

sure.

●

The distance to the preceding

vehicle is extremely short.

●

The vehicle is moving up and

down a large amount due to

road conditions during driving

(poor roads or road seams).

●

When driving in a tunnel or at

night with the headlights off or

when a headlight is dim due to

its lens being dirty or it being

misaligned.

●

The vehicle is struck by a cross-

wind.

●

The vehicle is affected by wind

from a vehicle driven in a

nearby lane.

●

The vehicle has just changed

lanes or crossed an intersec-

tion.

●

Tires which differ by structure,

manufacturer, brand or tread

pattern are used.

●

When tires of a size other than

specified are installed.

●

Snow tires, etc., are equipped.

●

The vehicle is being driven at

extremely high speeds.

234

5-5. Using the driving support systems

■

Lane departure alert func-
tion

When the system determines
that the vehicle might depart
from its lane or course

, a warn-

ing is displayed on the multi-
information display, and either a
warning buzzer will sound or the
steering wheel will vibrate to
alert the driver.

When the warning buzzer sounds
or the steering wheel vibrates,
check the area around your vehicle
and carefully operate the steering
wheel to move the vehicle back to
the center of the lane.
Vehicle with BSM: When the sys-
tem determines that the vehicle
might depart from its lane and that
the possibility of a collision with an
overtaking vehicle in the adjacent
lane is high, the lane departure
alert will operate even if the turn
signals are operating.

: Boundary between asphalt and

the side of the road, such as
grass, soil, or a curb

■

Steering assist function

When the system determines
that the vehicle might depart
from its lane or course

, the sys-

tem provides assistance as nec-
essary by operating the steering
wheel in small amounts for a
short period of time to keep the
vehicle in its lane.

Vehicle with BSM: When the sys-
tem determines that the vehicle
might depart from its lane and that
the possibility of a collision with an
overtaking vehicle in the adjacent
lane is high, the steering assist
function will operate even if the turn
signals are operating.

: Boundary between asphalt and

the side of the road, such as
grass, soil, or a curb

Functions included in LTA
system

236

5-5. Using the driving support systems

■

Turning the LTA system ON

Press the LTA switch

The LTA indicator illuminates and a
message is displayed on the multi-
information display.

■

Turning the lane centering
function ON/OFF

Press the LTA switch

The lane centering function will
change between ON/OFF each
time the switch is pressed.
The current setting will be dis-
played on the multi-information dis-
play.



Lane centering function ON

“LTA Steering Assist Active
Lane Centering Active”



Lane centering function OFF

“LTA Steering Assist Active”

■

Turning the LTA system
OFF

Press and hold the LTA switch

The LTA indicator light turns off
when the LTA is turned OFF.
Press the switch again to turn the
system on.
When the LTA system is turned on
or off, operation of the LTA system
continues in the same condition the
next time the fuel cell system is
started.

LTA system setting

Indications on multi-infor-
mation display

237

5-5. Using the driving support systems

ing

LTA indicator

The illumination condition of the
indicator informs the driver of the
system operation status.
Illuminated in white: LTA system is
operating.
Illuminated in green: Steering wheel
assistance of the steering assist
function or lane centering function
is operating.
Flashing in orange: Lane departure
alert function is operating.

Operation display of steering
wheel operation support

Displayed when the multi-informa-
tion display is switched to the driv-
ing support system information
screen.
Indicates that steering wheel assis-
tance of the steering assist function
or lane centering function is operat-
ing.
Both outer sides of the lane are dis-
played: Indicates that steering
wheel assist of the lane centering
function is operating.
One outer side of the lane is dis-
played: Indicates that steering
wheel assist of the steering assist
function is operating.
Both outer sides of the lane are
flashing: Alerts the driver that their
input is necessary to stay in the
center of the lane (lane centering
function).

Follow-up cruising display

Displayed when the multi-informa-
tion display is switched to the driv-
ing support system information
screen.
Indicates that steering assist of the

lane centering function is operating
by monitoring the position of a pre-
ceding vehicle.
When the follow-up cruising display
is displayed, if the preceding vehi-
cle moves, your vehicle may move
in the same way. Always pay care-
ful attention to your surroundings
and operate the steering wheel as
necessary to correct the path of the
vehicle and ensure safety.

Lane departure alert function
display

Displayed when the multi-informa-
tion display is switched to the driv-
ing support system information
screen.



Inside of displayed lines is
white

Indicates that the system is rec-
ognizing white (yellow) lines or a
course

. When the vehicle

departs from its lane, the white
line displayed on the side the
vehicle departs from flashes
orange.

238

5-5. Using the driving support systems



Inside of displayed lines is
black

Indicates that the system is not
able to recognize white (yellow)
lines or a course

or is temporar-

ily canceled.

: Boundary between asphalt and

the side of the road, such as
grass, soil, or a curb

■

Operation conditions of each

function

●

Lane departure alert function

This function operates when all of
the following conditions are met.
• LTA is turned on.

• Vehicle speed is approximately 32

mph (50 km/h) or more.

• System recognizes white (yellow)

lane lines or a course

. (When a

white [yellow] line or course

recognized on only one side, the

system will operate only for the

recognized side.)

• Width of traffic lane is approxi-

mately 9.8 ft. (3 m) or more.

• Turn signal lever is not operated.

(Vehicle with BSM: Except when

another vehicle is in the lane on

the side where the turn signal was

operated)

• Vehicle is not being driven around

a sharp curve.

• No system malfunctions are

detected. (



P.240)

:The function operates even if the

vehicle speed is less than
approximately 32 mph (50 km/h)
when the lane centering function
is operating.

:Boundary between asphalt and

the side of the road, such as
grass, soil, or a curb

●

Steering assist function

This function operates when all of
the following conditions are met in
addition to the operation conditions
for the lane departure alert function.
• Vehicle is not accelerated or

decelerated by a fixed amount or

more.

• Steering wheel is not operated

with a steering force level suitable

for changing lanes.

• ABS, VSC, TRAC and PCS are

not operating.

• TRAC or VSC is not turned off.

●

Vehicle sway warning function

This function operates when all of
the following conditions are met.

• Setting for “Sway Warning” in

of the multi-information display is
set to “ON”. (



P.512)

• Vehicle speed is approximately 32

mph (50 km/h) or more.

• Width of traffic lane is approxi-

mately 9.8 ft. (3 m) or more.

• No system malfunctions are

detected. (



P.240)

●

Lane centering function

This function operates when all of
the following conditions are met.
• LTA is turned on.
• Setting for “Lane Center” in

the multi-information display are
set to “ON”. (



P.512)

• This function recognizes white

(yellow) lane lines or the position

of a preceding vehicle (except

when the preceding vehicle is

small, such as a motorcycle).

• The dynamic radar cruise control

239

5-5. Using the driving support systems

ing

with full-speed range is operating

in vehicle-to-vehicle distance con-

trol mode.

• Width of traffic lane is approxi-

mately 10 to 13 ft. (3 to 4 m).

• Turn signal lever is not operated.

• Vehicle is not being driven around

a sharp curve.

• No system malfunctions are

detected. (



P.240)

• Vehicle does not accelerate or

decelerate by a fixed amount or

more.

• Steering wheel is not operated

with a steering force level suitable

for changing lanes.

• ABS, VSC, TRAC and PCS are

not operating.

• TRAC or VSC is not turned off.

• Hands off steering wheel warning

is not displayed. (



P.239)

• The vehicle is being driven in the

center of a lane.

• Steering assist function is not

operating.

■

Temporary cancelation of func-

tions

●

When operation conditions are no

longer met, a function may be

temporarily canceled. However,

when the operation conditions are

met again, operation of the func-

tion is automatically restored.

(



P.238)

●

If the operation conditions
(



P.238) are no longer met while

the lane centering function is
operating, the steering wheel may
vibrate and the buzzer may sound
to indicate that the function has
been temporarily canceled. How-
ever, if the “Alert” customization
setting is set to

, the system

will notify the driver by vibrating
the steering wheel instead of
sounding the buzzer.

■

Steering assist function/lane

centering function

●

Depending on the vehicle speed,

lane departure situation, road con-

ditions, etc., the driver may not

feel the function is operating or

the function may not operate at

all.

●

The steering control of the func-

tion is overridden by the driver’s

steering wheel operation.

●

Do not attempt to test the opera-

tion of the steering assist function.

■

Lane departure alert function

●

The warning buzzer may be diffi-

cult to hear due to external noise,

audio playback, etc. Also, it may

be difficult to feel steering wheel

vibrations due to the road condi-

tions, etc.

●

If the edge of the course

is not

clear or straight, the lane depar-

ture alert function may not oper-

ate.

●

Vehicle with BSM: It may not be

possible for the system to deter-

mine if there is a danger of a colli-

sion with a vehicle in an adjacent

lane.

●

Do not attempt to test the opera-

tion of the lane departure alert

function.

: Boundary between asphalt and

the side of the road, such as
grass, soil, or a curb

■

Hands off steering wheel warn-

ing

In the following situations, a warning

message urging the driver to hold

the steering wheel and the symbol

shown in the illustration are dis-

played on the multi-information dis-

play to warn the driver. The warning

stops when the system determines

that the driver holds the steering

wheel. Always keep your hands on

the steering wheel when using this

system, regardless of warnings.

240

5-5. Using the driving support systems

●

When the system determines the

driver is not holding the steering

wheel while the lane centering

function is operating.

If the driver continues to keep their
hands off of the steering wheel, the
buzzer sounds, the driver is warned
and the function is temporarily can-
celed. This warning also operates in
the same way when the driver con-
tinuously operates the steering
wheel only a small amount.

The buzzer also sounds even if the
alert type is set to

●

When the system determines that

the vehicle may deviate from the

lane while driving around a curve

while the lane centering function is

operating.

Depending on the vehicle condition
and road conditions, the warning
may not operate. Also, if the system
determines that the vehicle is driv-
ing around a curve, warnings will
occur earlier than during straight-
lane driving.

●

When the system determines that

the driver is driving without hold-

ing the steering wheel while the

steering wheel assist of the steer-

ing assist function is operating.

If the driver continues to keep their
hands off of the steering wheel and
the steering wheel assist is operat-
ing, the buzzer sounds and the
driver is warned. Each time the
buzzer sounds, the continuing time

of the buzzer becomes longer.

The buzzer also sounds even if the
alert type is set to

■

Vehicle sway warning function

When the system determines that

the vehicle is swaying while the

vehicle sway warning function is

operating, a buzzer sounds and a

warning message urging the driver

to rest and the symbol shown in the

illustration are simultaneously dis-

played on the multi-information dis-

play.

Depending on the vehicle and road

conditions, the warning may not

operate.

■

Warning message

If the following warning message is

displayed on the multi-information

display and the LTA indicator illumi-

nates in orange, follow the appropri-

ate troubleshooting procedure. Also,

if a different warning message is

displayed, follow the instructions

displayed on the screen.

●

“LTA Malfunction Visit Your

Dealer”

The system may not be operating

properly. Have the vehicle inspected

by your Toyota dealer.

●

“LTA Unavailable”

The system is temporarily canceled

due to a malfunction in a sensor

other than the front camera. Turn

the LTA system off, wait for a little

while, and then turn the LTA system

back on.

241

5-5. Using the driving support systems

ing

●

“LTA Unavailable at Current

Speed”

The function cannot be used as the

vehicle speed exceeds the LTA

operation range. Drive slower.

■

Customization

Function settings can be changed.

(Customizable features:



P.512)

:If equipped

:Vehicles with Toyota Teammate

Advanced Drive, refer to “Toyota
Teammate Advanced Drive
OWNER’S MANUAL”.

The RSA system recognizes
specific road signs using the
front camera and/or navigation
system

(when speed limit infor-

mation is available) to provide
information to the driver via the
display.

: If equipped

RSA (Road Sign

Assist)

*1, 2

Summary of function

WARNING

■

Before using the RSA

Do not rely solely upon the RSA

system. RSA is a system which

supports the driver by providing

information, but it is not a replace-

ment for a driver’s own vision and

awareness. Drive safely by

always paying careful attention to

the traffic rules.

242

5-5. Using the driving support systems

When the front camera recog-
nizes a sign and/or information
of a sign is available from the
navigation system (if equipped),
the sign will be displayed on the
multi-information display.



When the driving support sys-
tem information display is
selected, a maximum of 3
signs can be displayed.
(



P.105)



When a tab other than the
driving support system infor-
mation is selected, the follow-
ing types of road signs will be
displayed. (



P.105)

• Speed limit sign
• Do Not Enter sign (when notifica-

tion is necessary)

If signs other than speed limit signs
are recognized, they will be dis-
played in an overlapping stack
under the current speed limit sign.

The following types of road
signs, including electronic signs
and blinking signs, are recog-
nized.

A non-official or a recently intro-
duced traffic sign may not be recog-
nized.

In the following situations, the
RSA system will notify the
driver.



When the vehicle speed
exceeds the speed notifica-
tion threshold of the speed
limit sign displayed, the sign
display will be emphasized
and a buzzer will sound.

Indication on the multi-
information display

Supported types of road
signs

Speed limit

Do Not Enter

Stop

Yield

Notification function

Toyota Mirai (2023 year). Manual in english - page 14