Lexus LS500h (2022 year). Manual in english - page 14

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●

In addition to the above, in some situa-

tions, such as the following, the emer-

gency 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 narrower than 

normal

• When there is a light and dark pattern on 

the road surface, such as due to road 

repairs

• When the target is too close

• When there is insufficient safe or unob-

structed space for the vehicle to be 

steered into

• If oncoming vehicle is present

• If VSC function is operating

●

In some situations such as the following, 

sufficient braking force or steering force 

may not be obtained, preventing the sys-

tem 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 maintained 

(brakes or tires are excessively 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

■

If VSC is disabled

●

If VSC is disabled (



P.337), the pre-col-

lision brake assist and pre-collision brak-

ing functions are also disabled.

●

The PCS warning light will turn on and 

“VSC Turned Off Pre-Collision Brake 

System Unavailable” will be displayed on 

the multi-information display.

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4

Driving

*

: If equipped

When the system detects a vehicle 
approaching from the left or right in 
front of your vehicle when approaching 
an intersection, a notification will be 
displayed on the head-up display and 
panoramic view monitor

*

.

*

: Refer to “NAVIGATION AND MULTI-

MEDIA SYSTEM OWNER’S MAN-
UAL”.

When the system determines that your 
vehicle may be about to enter an inter-
section even though a vehicle is 
approaching from the left or right in 
front of your vehicle, a buzzer will 
sound and a message will be displayed 
on the multi-information display to 
urge you to depress the brake pedal.



Head-up display



Multi-information display

FCTA (Front Cross Traffic 
Alert)

*

When approaching an intersection 
at low speed, the radar sensors on 
the front side of the vehicle can 
detect approaching vehicles to the 
left and right of the front of the vehi-
cle. In this case, the head-up display 
is used to inform the driver of 
detected vehicles.

FCTA system functions

WARNING

■

Cautions regarding the use of the 

function

The driver is solely responsible for safe 

driving. Always drive safely, taking care 

to observe your surroundings.
The FCTA system is a supplementary 

system that informs the driver of vehicles 

approaching from the left and right of the 

front of the vehicle.
Do not overly rely on the FCTA system. 

Over reliance on the system may lead to 

an accident, resulting in death or serious 

injury.
The details of the warning display may 

differ from the actual traffic conditions.
Although the warning display will stop 

being displayed after a certain amount of 

time, this does not indicate that vehicles 

or pedestrians are no longer around your 

vehicle.

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■

Enabling/disabling the FCTA sys-
tem

The FCTA system can be enabled/dis-
abled on 

 (



P.84) of the 

multi-information display.

The system is automatically enabled each 
time the power switch is turned to ON 
mode.

■

Changing the alert timing

The FCTA (Front Cross Traffic Alert) 
timing can be changed on 

 

(



P.84) of the multi-information dis-

play.

The set alert timing is retained when the 
power switch is turned off. However, if the 
FCTA system is disabled and re-enabled, 
the alert timing will return to the default 
setting (middle).

1

Early

2

Middle

This is the default setting.

3

Late

■

The FCTA function is operational when

The system operates when all of the follow-

ing conditions are met.

●

A shift position other than P or R is 

selected.

●

Vehicle speed is approximately 9 mph 

(15 km/h) or lower.

●

A vehicle is approaching from the left or 

right in front of your vehicle at a speed 

between approximately 6 mph (10 km/h) 

and 37 mph (60 km/h).

●

There are no preceding vehicles ahead of 

your vehicle.

●

The accelerator pedal is not strongly 

depressed.

●

The brake pedal is not being strongly 

depressed.

■

Situations in which the system may 

operate even though no vehicles are 

approaching

In certain situations, such as the following, 

the system may operate even though no 

vehicles are approaching:

●

When approaching objects on the road-

side, such as guardrails, traffic signs, util-

ity poles, street lights, trees, or walls

●

When driving near a TV tower, broad-

casting station, electric power plant, or 

other location where strong radio waves 

or electrical noise may be present

●

When passing an object on the side of the 

road, such as a parked vehicle

●

When a vehicle or pedestrian is 

approaching from the left or right in front 

of your vehicle from far away

●

When a vehicle or pedestrian is moving 

within a parking spot, etc. next to the lane 

your vehicle is driving in

●

When a pedestrian or bicyclist is moving 

on a sidewalk

●

When a vehicle or pedestrian is moving 

away from your vehicle

●

When a vehicle approaching from the left 

or right in front of your vehicle is deceler-

ating or stops

●

When a vehicle approaching from the left 

Changing settings of the FCTA 
system

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4

Driving

or right in front of your vehicle makes a 

left/right turn immediately in front of your 

vehicle

●

When a pedestrian is approaching your 

vehicle

●

When an oncoming vehicle makes a 

left/right turn

●

When your vehicle enters an intersection 

before a vehicle approaching from the 

left or right in front of your vehicle

●

When stopped at traffic light and a vehi-

cle approaches from the left or right in 

front of your vehicle

●

When driving in a location where there 

are objects which reflect radar, such as 

vehicles, guardrails, walls, traffic signs, 

etc.

●

When making a left/right turn in front of 

an approaching vehicle

●

When passing an oncoming vehicle

●

When being overtaken by another vehi-

cle

●

When driving next to another vehicle or a 

pedestrian

●

When a vehicle or pedestrian 

approaches the side of your vehicle

Some objects, such as the following, may be 

detected and cause the FCTA system to 

operate:

●

Pedestrians

■

Situations in which the system may not 

operate properly

In some situations, such as the following, a 

vehicle may not be detected by a front side 

radar sensor, preventing the system from 

operating properly:

●

If the front end or side of an approaching 

vehicle is small (sports cars, etc.)

●

If the front end of an approaching vehicle 

is low (low-slung sports cars, etc.)

●

If the ground clearance of an approach-

ing vehicle is extremely high

●

If the shape of an approaching vehicle is 

unusual (tractors, motorcycles with side-

cars, etc.)

●

If a vehicle suddenly enters the detection 

area on the left or right in front of your 

vehicle from a parking lot, etc.

●

If an approaching vehicle moves sud-

denly (sudden steering, acceleration, 

deceleration, etc.)

●

When driving in inclement weather such 

as heavy rain, fog, snow or a sandstorm

●

After the hybrid system has been started 

and the vehicle has not been driven for a 

certain amount of time

●

When driving on a road with a grade that 

changes sharply (sharp incline/decline)

●

When driving around a sharp curve or on 

an undulating road

●

If a vehicle is approaching from the left or 

right of the front of your vehicle diago-

nally

●

When a vehicle is approaching from the 

left or right in front of your vehicle from 

far away

●

When there is an object between your 

vehicle and an approaching vehicle

●

When driving in a location where there 

are objects which reflect radar, such as 

guardrails, walls, vehicles, etc.

●

When a group of vehicles which are close 

together approach

●

Immediately after the FCTA system has 

been enabled

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■

If the PCS warning light illuminates and 

a message is displayed on the 

multi-information display

The system may be temporarily unavailable 

or may be malfunctioning.

While driving on a road with clear 
white (yellow) lane lines, the LTA sys-
tem 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 devia-
tion 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 
and when changing lanes.
The LTA system recognizes white (yel-
low) lane lines or a course

*

 using the 

front camera. Additionally, it detects 
preceding and surrounding 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) 
(vehicles with Lexus Safety 
System + A)

Summary of functions

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WARNING

■

Before using LTA system

●

Do not rely solely upon the LTA sys-

tem. The LTA system does not auto-

matically drive the vehicle 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 pay-

ing careful attention to the surround-

ing conditions 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 careful attention 

may lead to an accident, resulting in 

death or serious injury.

●

When not using the LTA system, use 

the LTA switch to turn the system off.

■

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 surface 

which is slippery due to rainy weather, 

fallen snow, freezing, etc.

●

Vehicle is driven on a snow-covered 

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 construction 

zone.

●

A spare tire, tire chains, etc. are 

equipped.

●

When the tires have been excessively 

worn, or when the tire inflation pres-

sure is low.

●

During emergency towing.

■

Situations in which the lane change 

assist function should not be used

●

When driving on a one lane road or 

road without lane markers

●

When there is no broken white line 

between your vehicle and the lane 

toward which the turn signal is oper-

ated

●

Vehicle is driven in traffic lanes other 

than that freeways and highways.

■

Preventing LTA system malfunctions 

and operations performed by mistake

●

Do not modify the headlights or place 

stickers, etc. on the surface of the 

lights.

●

Do not modify the suspension etc. If 

the suspension etc. needs to be 

replaced, contact your Lexus 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, con-

tact your Lexus dealer.

■

Conditions in which functions may 

not operate properly

In the following situations, the functions 

may not operate properly 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.

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WARNING

●

When the follow-up cruising display is 

displayed (



P.247) and the preced-

ing vehicle changes lanes. (Your vehi-

cle may follow the preceding vehicle 

and also change lanes.)

●

When the follow-up cruising display is 

displayed (



P.247) and the preced-

ing vehicle is swaying. (Your vehicle 

may sway accordingly and depart from 

the lane.)

●

When the follow-up cruising display is 

displayed (



P.247) and the preced-

ing vehicle departs from its lane. (Your 

vehicle may follow the preceding vehi-

cle and depart from the lane.)

●

When the follow-up cruising display is 

displayed (



P.247) and the preced-

ing 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 mis-

taken for white (yellow) lines are pres-

ent 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.

●

The vehicle is driven in an area without 

white (yellow) lines, such as in front of a 

tollgate or checkpoint, or at an inter-

section, 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.

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■

Lane departure alert function

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

*

, a warning is displayed on the 

multi-information display, and either a 
warning buzzer will sound or the steer-
ing 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.
When the system determines that the vehi-
cle 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

WARNING

●

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 sur-

face, such as concrete.

●

If the edge of the road is not clear or 

straight.

●

The vehicle is driven on a surface 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 oncom-

ing 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 winding 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 pressure.

●

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 head-

light is dim due to its lens being dirty or 

it being misaligned.

●

The vehicle is struck by a crosswind.

●

The vehicle is affected by wind from a 

vehicle driven in a nearby lane.

●

The vehicle has just changed lanes or 

crossed an intersection.

●

Tires which differ by structure, manu-

facturer, brand or tread pattern are 

used.

●

When tires of a size other than speci-

fied are installed.

●

Snow tires, etc. are equipped.

●

The vehicle is being driven at 

extremely high speeds.

Functions included in LTA system

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■

Steering assist function

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

*

, the system provides assis-

tance as necessary by operating the 
steering wheel in small amounts for a 
short period of time to keep the vehicle 
in its lane.

If the system detects that the steering 
wheel has not been operated for a fixed 
amount of time or the steering wheel is not 
being firmly gripped, a warning is displayed 
on the multi-information display and the 
function is temporarily canceled.
When the system determines that the vehi-
cle 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

■

Vehicle sway warning function

When the vehicle is swaying within a 
lane, the warning buzzer will sound and 
a message will be displayed on the 
multi-information display to alert the 
driver.

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■

Lane centering function

This function is linked with dynamic 
radar cruise control with full-speed 
range and provides the required assis-
tance by operating the steering wheel 
to keep the vehicle in its current lane.

When dynamic radar cruise control with 
full-speed range is not operating, the lane 
centering function does not operate.
In situations where the white (yellow) lane 
lines are difficult to see or are not visible, 
such as when in a traffic jam, this function 
will operate to help follow a preceding 
vehicle by monitoring the position of the 
preceding vehicle.
If the system detects that the steering 
wheel has not been operated for a fixed 
amount of time or the steering wheel is not 
being firmly gripped, a warning is displayed 
on the multi-information display and the 
function is temporarily canceled.

■

Lane change assist function

This function is linked to the dynamic 

radar cruise control with full-speed 
range and provides assistance for per-
forming lane changes by operating the 
steering wheel when you hold the turn 
signal lever partway (lane change posi-
tion). (



P.184)

When lane change assist function is 
operating, the acceleration and decel-
eration of the vehicle is controlled 
while the preceding vehicle and vehi-
cles driven in the lane toward which the 
turn signal is operated are monitored.
Use lane change assist function on 
freeways and highways.

When the lane centering function is not 
operating, the lane change assist function 
will not operate.
The lane change assist function should not 
be operated when changing lanes on a 
road that is diverging or merging.

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Press the LTA switch to turn the LTA 
system on.

The LTA indicator illuminates and a mes-
sage is displayed on the multi-information 
display.
Press the LTA switch again to turn the LTA 
system off.
When the LTA system is turned on or off, 
operation of the LTA system continues in 
the same condition the next time the hybrid 
system is started.

Hold the turn signal lever partway 
(lane change position) for approxi-
mately 1 second.(



P.184)

The direction you are signaling will be dis-
played on the multi-information display.

LTA indicator

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

Turning LTA system on

Operating the lane change assist 
function

Indications on multi-information 
display

A

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function is operating.

Operation display of steering 
wheel operation support

Displayed when the multi-information dis-
play is switched to the driving support sys-
tem information display.
Indicates that steering wheel assistance of 
the steering assist function or lane center-
ing function is operating.
Both outer sides of the lane are displayed: 
Indicates that steering wheel assist of the 
lane centering function is operating.
One outer side of the lane is displayed: 
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 neces-
sary to stay in the center of the lane (lane 
centering function).

Lane departure alert function dis-
play

Displayed when the multi-information dis-
play is switched to the driving support sys-
tem information display.



Inside of displayed lines is white

Indicates that the system is recognizing 
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.



Inside of displayed lines is black

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

*

 or is temporarily canceled.

*

: Boundary between asphalt and the side 

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

Follow-up cruising display

Displayed when the multi-information dis-
play is switched to the driving support sys-
tem information display.
Indicates that steering assist of the lane 
centering function is operating by monitor-
ing the position of a preceding vehicle.
When the follow-up cruising display is dis-
played, if the preceding vehicle moves, 
your vehicle may move in the same way. 
Always pay careful attention to your sur-
roundings and operate the steering wheel 
as necessary to correct the path of the 
vehicle and ensure safety.

■

Lane change assist function



Lane change assist display

B

C

D

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4-5. Using the driving support systems

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Indicates that steering wheel assist of the 
lane change assist function is operating.



Approaching vehicle warning dis-
play

Indicates that an approaching vehicle is 
detected in the adjacent lane.

■

Warning display

When the lane centering function is oper-
ating and the system determines that the 
vehicle may depart from its lane due to a 
sharp curve, etc., a warning display urging 
the driver to operate the steering wheel, 
will be displayed.
This display will also be displayed when 
operation of the lane change assist func-
tion is canceled.
In some situations a warning display may 
not be displayed.

Some displays, which are the same as 
those displayed on the multi-informa-
tion display, will be displayed.

■

LTA system curve display on the 
head-up display

The curve display on the head-up display 
changes according to the direction and 
curvature of the curve.

■

Operation conditions of each function

●

Lane departure alert function

This function operates when all of the fol-

lowing conditions are met.

• LTA is turned on.

• Vehicle speed is approximately 32 mph 

(50 km/h) or more.

*1

• System recognizes white (yellow) lane 

lines or a course

*2

. (When a white [yel-

low] line or course

*2

 is recognized on 

only one side, the system will operate 

only for the recognized side.)

• Width of traffic lane is approximately 9.8 

ft. (3 m) or more.

• Turn signal lever is not operated. (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.252)

• The Advanced Drive is not operating. (if 

equipped)

*1

: The function operates even if the vehi-

cle speed is less than approximately 32 
mph (50 km/h) when the lane center-
ing function is operating.

*2

: Boundary between asphalt and the side 

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

●

Steering assist function

Indications on head-up display

249

4-5. Using the driving support systems

LEXUS LS500h Owner's Manual

4

Driving

This function operates when all of the fol-

lowing conditions are met in addition to the 

operation conditions for the lane depar-

ture alert function.
• Setting  for  “Steering  Assist” in 

 of the 

multi-information display is set to “ON”. 

(



P.84)

• 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 oper-

ating.

• TRAC or VSC is not turned off.

• Hands off steering wheel warning is not 

displayed. (



P.251)

• The Advanced Drive is not operating. (if 

equipped)

●

Vehicle sway warning function

This function operates when all of the fol-

lowing conditions are met.
• Setting for “Sway Warning” in 

 of the 

multi-information display is set to “ON”. 

(



P.84)

• Vehicle speed is approximately 32 mph 

(50 km/h) or more.

• Width of traffic lane is approximately 9.8 

ft. (3 m) or more.

• No system malfunctions are detected. 

(



P.252)

• The Advanced Drive is not operating. (if 

equipped)

●

Lane centering function

This function operates when all of the fol-

lowing conditions are met.

• LTA is turned on.

• Setting for “Steering Assist” and “Lane 

Center” in 

 of the multi-information 

display are set to “ON”. (



P.84)

• This function recognizes white (yellow) 

lane lines or the position of a preceding 

vehicle (except when the preceding vehi-

cle is small, such as a motorcycle).

• The dynamic radar cruise control with 

full-speed range is operating in vehi-

cle-to-vehicle distance control mode.

• Width of traffic lane is approximately 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.252)

• Vehicle does not accelerate or deceler-

ate 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 oper-

ating.

• TRAC or VSC is not turned off.

• Hands off steering wheel warning is not 

displayed. (



P.251)

• The driver has one or both hands on the 

steering wheel.

• The vehicle is being driven in the center 

of a lane.

• Steering assist function is not operating.

• The Advanced Drive is not operating. (if 

equipped)

●

Lane change assist function

This function will operate when all of the 

following conditions are met:

• The lane centering function is operating.

• “Lane Change Assist” is set to “ON” in 

 of the multi-information dis-

play.(



P.84)

• The vehicle speed is between approxi-

mately 57 and 85 mph (90 and 140 

km/h).

• White (yellow) lane lines are detected by 

the system.

• A broken white line is detected between 

your vehicle and the lane toward which 

the turn signal is operated.

• The turn signal lever is held partway (lane 

change position) for approximately 1 sec-

ond.

• A vehicle is not overtaking your vehicle 

or detected in the lane toward which the 

turn signal is operated.

• The vehicle is being driven straight or 

around a slight curve.

• The vehicle is not accelerating or decel-

erating more than a certain amount.

• The steering wheel is not being turned 

sufficiently to perform a lane change.

• ABS, VSC, TRAC and PCS are not oper-

ating.

• TRAC or VSC is not turned off.

• Hands off steering wheel warning is not 

displayed. (



P.251)

• The dynamic radar cruise control with 

250

4-5. Using the driving support systems

LEXUS LS500h Owner's Manual

full-speed range approach warning is not 

operating.

• The lane departure alert function is not 

operating.

• The curve speed reduction function 

(



P.273) is not operating.

• The Advanced Drive is not operating. (if 

equipped)

■

Temporary cancelation of functions

●

When operation conditions are no longer 

met, a function may be temporarily can-

celed. However, when the operation con-

ditions are met again, operation of the 

function is automatically restored. 

(



P.249)

●

If the operation conditions (



P.249) 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 tem-

porarily canceled. However, if the “Alert” 
customization setting is set to 

, 

the system will notify the driver by vibrat-

ing the steering wheel instead of sound-

ing the buzzer.

●

If the operating conditions (



P.249) are 

no longer met, the buzzer may sound to 

indicate that the lane change assist func-

tion has been temporarily canceled.

■

Steering assist function/lane centering 

function

●

Depending on the vehicle speed, lane 

departure situation, road conditions, etc., 

the driver may not feel the function is 

operating or the function may not oper-

ate at all.

●

Even if the curve speed reduction func-

tion (



P.273) operates, the lane center-

ing function may not be able to drive the 

vehicle around a curve successfully.

●

The steering control of the function is 

overridden by the driver’s steering wheel 

operation.

●

Do not attempt to test the operation of 

the steering assist function.

■

Lane departure alert function

●

The warning buzzer may be difficult to 

hear due to external noise, audio play-

back, etc. Also, it may be difficult to feel 

steering wheel vibrations due to the road 

conditions, etc.

●

If the edge of the course

*

 is not clear or 

straight, the lane departure alert function 

may not operate.

●

It may not be possible for the system to 

determine if there is a danger of a colli-

sion with a vehicle in an adjacent lane.

●

Do not attempt to test the operation of 

the lane departure alert function.

*

: Boundary between asphalt and the side 

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

■

Lane change assist function

Depending on the vehicle speed, vehicle 

condition, road conditions, or conditions of 

the area around the vehicle, the lane 

change assist function may not operate or it 

may be difficult to recognize that it has 

operated.
If steering control operation is excessive or 

insufficient, it can be corrected by the 

driver’s operation of the steering wheel.
In situations such as the following, the lane 

change assist function may be canceled:

●

When the system no longer detects white 

(yellow) lane lines

●

When the turn signal lever is operated 

fully (right/left turn position)

●

When the vehicle speed is outside of the 

operational range of the function

●

When the system detects operation of 

the steering wheel, brake or accelerator 

pedal by the driver

While the lane change assist function is 

operating, if the system detects that a vehi-

cle is quickly approaching in the lane 

toward which the turn signal is operated, 

the steering assist may slightly steer the 

vehicle away from the lane while a buzzer is 

sounding, the steering wheel is vibrating, 

and a warning display is displayed on the 

multi-information display, to help prevent 

the vehicle from entering the lane and alert 

the driver of the approaching vehicle.

■

Hands off steering wheel warning

In the following situations, a warning mes-

sage urging the driver to hold the steering 

251

4-5. Using the driving support systems

LEXUS LS500h Owner's Manual

4

Driving

wheel and the symbol shown in the illustra-

tion are displayed on the multi-information 

display 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 warn-

ings.
Depending on the vehicle condition and 

road conditions, the warning may not oper-

ate. Also, if the system determines that the 

vehicle is driving around a curve, warnings 

will occur earlier than during straight-lane 

driving.

●

When the system determines that the 

driver is driving without holding the steer-

ing wheel while the system is operating

If the driver continues to keep their hands 
off of the steering wheel, the buzzer 
sounds, the driver is warned and the func-
tion is temporarily canceled. This warning 
also operates in the same way when the 
driver continuously 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 

driver is driving without holding the steer-

ing wheel while the steering wheel assist 

of the steering assist function is operating

If the driver continues to keep their hands 
off of the steering wheel and the steering 
wheel assist is operating, 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 

.

In situations such as the following, the sys-

tem may not be able to detect when the 

driver’s hands are on the steering wheel:

●

If a steering wheel cover is installed.

●

If the driver is wearing gloves.

●

If something is attached to the steering 

wheel.

●

If the driver is gripping the wood trim, 

stitched area, spokes, or other part of the 

steering wheel that does not have sen-

sors.

In situations such as the following, the hands 

off steering wheel alert may not operate 

and the steering assist function and lane 

centering function may operate even if the 

driver’s hands are off the steering wheel:

●

If an object contacts the steering wheel.

●

If a wide object or arms are held in front 

of the steering wheel.

■

Vehicle sway warning function

When the system determines that the vehi-

cle is swaying while the vehicle sway warn-

ing function is operating, a buzzer sounds 

and a warning message urging the driver to 

rest and the symbol shown in the illustration 

are simultaneously displayed on the 

multi-information display.

Depending on the vehicle and road condi-

tions, the warning may not operate.

■

Situations in which LTA will turn on auto-

matically (vehicles with Advanced 

Drive)

When the dynamic radar cruise control 

with full-speed range operates in vehi-

cle-to-vehicle distance control mode, LTA 

will turn on. (



P.270)

■

LTA (Lane Tracing Assist) warning mes-

sages

If the following warning message is dis-