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

 

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

 

 

243

4

4-5. Using the driving support systems

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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 

.

Q

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.

Q

Warning message

If the following warning message is dis-

played on the multi-information display and 

the LTA indicator illuminates in orange, fol-

low the appropriate troubleshooting proce-

dure. Also, if a different warning message is 

displayed, follow the instructions displayed 

on the screen.

O

“LTA Malfunction Visit Your Dealer”

The system may not be operating properly. 
Have the vehicle inspected by any autho-
rized Lexus retailer or Lexus authorized 
repairer, or any reliable repairer.

O

“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.

O

“LTA Unavailable at Current Speed”

The function cannot be used as the vehicle 
speed exceeds the LTA operation range. 
Drive slower.

Q

Customization

Function settings can be changed.
(Customizable features: 

P.463)

244

4-5. Using the driving support systems

*

: If equipped

When the front camera recognizes a 

sign and/or information of a sign is 
available from the navigation system, 
the sign will be displayed on the multi-
information display.

When the driving support system 
information is selected, a maximum 
of 3 signs can be displayed. 
(

P.107)

When a tab other than the driving 
support system information is 
selected, the following types of road 
signs will be displayed. (

P.107)

• Speed limit begins/ends sign
• Speed limit related information sign 

(Motorway, Expressway, Urban area, 
Residential area)

• End of prohibition sign

• No-entry  sign

*

 (when notification is nec-

essary)

• Speed limit with supplemental sign 

(Ramp way only)

*

: For vehicles with navigation system

RSA (Road Sign Assist)

*

The RSA system recognizes spe-
cific road signs using the front cam-
era and/or navigation system 
(when speed limit information is 
available) to provide information to 
the driver via the display.

If the system judges that the vehicle 
is being driven over the speed limit, 
performing prohibited actions, etc. 
according to the recognized road 
signs, it notifies the driver through a 
visual notification and notification 
buzzer or steering wheel vibration.

WARNING

Q

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 replacement for a driver’s own 

vision and awareness. Drive safely by 

always paying careful attention to the 

traffic rules.

Indication on the multi-informa-
tion display

245

4

4-5. Using the driving support systems

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If signs other than speed limit signs are rec-
ognized, they will be displayed in an over-
lapping stack under the current speed limit 
sign.

The following types of road signs, 
including electronic signs and blinking 
signs, are displayed.

A non-official (not meeting the Vienna 
Convention) or a recently introduced traf-
fic sign may not be displayed.

Speed limit road signs

*

: Speed limit begins/Maximum 

speed zone begins

: Speed limit ends/Maximum 

speed zone ends

*

: No speed limit information 

 is dis-

played when speed limit sign or speed 
limit related sign information is not avail-
able.

Speed limit related information

*1, 2

: Motorway entrance

: Motorway exit

: Expressway entrance

: Expressway exit

: Urban area beginning

: Urban area ending

: Urban area beginning

: Urban area ending

: Residential area beginning

: Residential area ending

*1

: Displayed when a sign is recognized 

but speed limit information for the road 
is not available from the navigation sys-
tem

*2

: No speed limit information 

 is dis-

played when speed limit sign or speed 
limit related sign information is not 
available.

No-overtaking road signs

: No overtaking begins

Supported types of road signs

246

4-5. Using the driving support systems

: No overtaking ends

Other road signs

: No-entry

*

: End of prohibition

: Stop

*

: For vehicles with navigation system

Speed limit with supplemental 
mark

*1

: Wet

: Rain

: Ice

: Supplemental mark exists

*2

: Exit ramp on right

*3

: Exit ramp on left

*3

: Time

*1

: Displayed simultaneously with speed 

limit

*2

: Contents not recognized.

*3

: If the turn signal indicator is not oper-

ated when changing lanes, the mark 
does not display.

In the following situations, the RSA sys-
tem will notify the driver.

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

When the RSA system recognizes a 
no-entry sign and detects that the 
vehicle has entered a no-entry area 
based on the map information of the 
navigation system, the no-entry sign 
flashes and a buzzer will sound. (For 
vehicles with navigation system)

If it is detected that your vehicle is 
overtaking when a no overtaking 
sign is displayed on the multi-infor-
mation display, the displayed sign 
will flash and a steering wheel will 
vibrate.

Depending on the situation, traffic 
environment (traffic direction, speed 
unit) may be detected incorrectly and a 
notification function may not operate 
properly.

Q

Setting procedure

1

Press 

 or 

 of the meter control 

switches and select 

2

Press 

 or 

 of the meter control 

switches and select “Vehicle Settings”, 

then press “OK”

3

Press 

 or 

 of the meter control 

switches and select 

, then press 

“OK”

Notification function

247

4

4-5. Using the driving support systems

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4

Press 

 or 

 of the meter control 

switches and select “RSA”, then press 

“OK”

Q

Automatic turn-off of RSA sign display

One or more signs automatically turn off in 

the following situations.

O

No sign has been recognized for a cer-

tain distance.

O

The road changes due to a left or right 

turn, etc.

Q

Conditions in which the function may 

not operate or detect correctly

In the following situations, RSA does not 

operate normally and may not recognize 

signs, display the incorrect sign, etc. How-

ever, this does not indicate a malfunction.

O

The front camera is misaligned due to a 

strong impact being applied to the sen-

sor, etc.

O

Dirt, snow, stickers, etc. are on the wind-

shield near the front camera.

O

In inclement weather such as heavy rain, 

fog, snow or sand storms.

O

Light from an oncoming vehicle, the sun, 

etc. enters the front camera.

O

The sign is dirty, faded, tilted or bent.

O

The contrast of electronic sign is low.

O

All or part of the sign is hidden by the 

leaves of a tree, a pole, etc.

O

The sign is only visible to the front camera 

for a short amount of time.

O

The driving scene (turning, lane change, 

etc.) is judged incorrectly.

O

If a sign not appropriate for the currently 

traveled lane, but the sign exists directly 

after a freeway branches, or in an adja-

cent lane just before merging.

O

Stickers are attached to the rear of the 

preceding vehicle.

O

A sign resembling a system compatible 

sign is recognized.

O

Side road speed signs may be detected 

and displayed (if positioned in sight of the 

front camera) while the vehicle is travel-

ing on the main road.

O

Roundabout exit road speed signs may 

be detected and displayed (if positioned 

in sight of the front camera) while travel-

ing on a roundabout.

O

The front of the vehicle is raised or low-

ered due to the carried load.

O

The surrounding brightness is not suffi-

cient or changes suddenly.

O

When a sign intended for trucks, etc. is 

recognized.

O

The vehicle is driven in a country with a 

different direction of traffic.

O

The navigation system map data is out-

dated.

O

The navigation system is not operating.

O

The speed information displayed on the 

meter and on the navigation system may 

be different due to the navigation system 

using map data.

Q

Speed limit sign display

If the power switch was last turned off while 

a speed limit sign was displayed on the 

multi-information display, the same sign dis-

plays again when the power switch is turned 

to ON mode.

Q

If “RSA Malfunction Visit Your Dealer” 

is shown

The system may be malfunctioning. Have 

the vehicle inspected by any authorized 

Lexus retailer or Lexus authorized repairer, 

or any reliable repairer.

Q

Customization

Some functions can be customized. (Cus-

tomizable features: 

P.463)

248

4-5. Using the driving support systems

*

: If equipped

Q

Meter display

Multi-information display

Set speed

Indicators

Q

Operation switches

Vehicle-to-vehicle distance switch

“+RES” switch

Cruise control main switch

Cancel switch

“-SET” switch

Dynamic radar cruise con-
trol with full-speed range

*

In vehicle-to-vehicle distance con-
trol mode, the vehicle automati-
cally accelerates, decelerates and 
stops to match the speed changes 
of the preceding vehicle even if the 
accelerator pedal is not depressed. 
In constant speed control mode, 
the vehicle runs at a fixed speed.
Use the dynamic radar cruise con-
trol with full-speed range on free-
ways and highways.

Vehicle-to-vehicle distance con-
trol mode (

P.250)

Constant speed control mode 
(

P.255)

System Components

A
B
C

WARNING

Q

Before using dynamic radar cruise 

control with full-speed range

O

Driving safely is the sole responsibility 

of the driver. Do not rely solely on the 

system, and drive safely by always pay-

ing careful attention to your surround-

ings.

O

The dynamic radar cruise control with 

full-speed range provides driving 

assistance to reduce the driver’s bur-

den. However, there are limitations to 

the assistance provided.

Read the following conditions care-

fully. Do not overly rely on this system 

and always drive carefully.

• When the sensor may not be correctly 

detecting the vehicle ahead: 

P.258

• Conditions under which the vehicle-

to-vehicle distance control mode may 

not function correctly: 

P.259

A
B
C
D

E

249

4

4-5. Using the driving support systems

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WARNING

O

Set the speed appropriately depend-

ing on the speed limit, traffic flow, road 

conditions, weather conditions, etc. 

The driver is responsible for checking 

the set speed.

O

Even when the system is functioning 

normally, the condition of the preced-

ing vehicle as detected by the system 

may differ from the condition 

observed by the driver. Therefore, the 

driver must always remain alert, assess 

the danger of each situation and drive 

safely. Relying solely on this system or 

assuming the system ensures safety 

while driving can lead to an accident, 

resulting in death or serious injury.

O

Switch the dynamic radar cruise con-

trol with full-speed range setting to off, 

using the cruise control main switch 

when not in use.

Q

Cautions regarding the driving assist 

systems

Observe the following precautions, as 

there are limitations to the assistance 

provided by the system.

Failure to do so may cause an accident 

resulting in death or serious injury.

O

Assisting the driver to measure follow-

ing distance

The dynamic radar cruise control with 

full-speed range is only intended to 

help the driver in determining the fol-

lowing distance between the driver’s 

own vehicle and a designated vehicle 

traveling ahead. It is not a mechanism 

that allows careless or inattentive driv-

ing, and it is not a system that can assist 

the driver in low-visibility conditions. It 

is still necessary for driver to pay close 

attention to the vehicle’s surroundings.

O

Assisting the driver to judge proper 

following distance

The dynamic radar cruise control with 

full-speed range determines whether 

the following distance between the 

driver’s own vehicle and a designated 

vehicle traveling ahead is within a set 

range. It is not capable of making any 

other type of judgement. Therefore, it 

is absolutely necessary for the driver to 

remain vigilant and to determine 

whether or not there is a possibility of 

danger in any given situation.

O

Assisting the driver to operate the 

vehicle

The dynamic radar cruise control with 

full-speed range does not include 

functions which will prevent or avoid 

collisions with vehicles ahead of your 

vehicle. Therefore, if there is ever any 

possibility of danger, the driver must 

take immediate and direct control of 

the vehicle and act appropriately in 

order to ensure the safety of all 

involved.

Q

Situations unsuitable for dynamic 

radar cruise control with full-speed 

range

Do not use dynamic radar cruise control 

with full-speed range in any of the follow-

ing situations. Doing so may result in 

inappropriate speed control and could 

cause an accident resulting in death or 

serious injury.

O

Roads where there are pedestrians, 

cyclists, etc.

O

In heavy traffic

O

On roads with sharp bends

O

On winding roads

O

On slippery roads, such as those cov-

ered with rain, ice or snow

250

4-5. Using the driving support systems

This mode employs a radar to detect the presence of vehicles up to approximately 
100 m (328 ft.) ahead, determines the current vehicle-to-vehicle following dis-
tance, and operates to maintain a suitable following distance from the vehicle 
ahead. The desired vehicle-to-vehicle distance can also be set by operating the 
vehicle-to-vehicle distance switch.

When driving on downhill slopes, the vehicle-to-vehicle distance may become shorter.

WARNING

O

On steep downhills, or where there 

are sudden changes between sharp up 

and down gradients 

Vehicle speed may exceed the set 

speed when driving down a steep hill.

O

At entrances to freeways and high-

ways

O

When weather conditions are bad 

enough that they may prevent the sen-

sors from detecting correctly (fog, 

snow, sandstorm, heavy rain, etc.)

O

When there is rain, snow, etc. on the 

front surface of the radar or front cam-

era

O

In traffic conditions that require fre-

quent repeated acceleration and 

deceleration

O

During emergency towing

O

When an approach warning buzzer is 

heard often

Driving in vehicle-to-vehicle distance control mode

251

4

4-5. Using the driving support systems

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Example of constant speed cruising 
When there are no vehicles ahead

The vehicle travels at the speed set by the driver.

Example of deceleration cruising and follow-up cruising 
When a preceding vehicle driving slower than the set speed appears

When a vehicle is detected running ahead of you, the system automatically decelerates 
your vehicle. When a greater reduction in vehicle speed is necessary, the system applies 
the brakes (the stop lights will come on at this time). The system will respond to changes in 
the speed of the vehicle ahead in order to maintain the vehicle-to-vehicle distance set by 
the driver. Approach warning warns you when the system cannot decelerate sufficiently to 
prevent your vehicle from closing in on the vehicle ahead.
When the vehicle ahead of you stops, your vehicle will also stop (vehicle is stopped by sys-
tem control). After the vehicle ahead starts off, pressing the “+RES” switch or depressing 
the accelerator pedal (start-off operation) will resume follow-up cruising. If the start-off 
operation is not performed, system control continues to keep your vehicle stopped.
When the turn signal lever is operated and your vehicle moves to an overtaking lane while 
driving at 80 km/h (50 mph) or more, the vehicle will accelerate to help to overtake a 
passing vehicle.
The system’s identification of what is an overtaking lane may be determined solely based on 
the location of the steering wheel in the vehicle (left side driver position versus right side 
driver position.) If the vehicle is driven to a region where the overtaking lane is on a differ-
ent side from where the vehicle is normally driven, the vehicle may accelerate when the 
turn signal lever is operated in the opposite direction to the overtaking lane (e.g., if the 
driver normally operates the vehicle in a region where the overtaking lane is to the right but 
then drives to a region where the overtaking lane is to the left, the vehicle may accelerate 
when the right turn signal is activated).

Example of acceleration 

A

B

C

252

4-5. Using the driving support systems

When there are no longer any preceding vehicles driving slower than the set 
speed

The system accelerates until the set speed is reached. The system then returns to constant 
speed cruising.

1

Press the cruise control main 
switch to activate the cruise con-
trol.

Dynamic radar cruise control indicator will 

come on and a message will be displayed 

on the multi-information display. Press the 

switch again to deactivate the cruise con-

trol.
If the cruise control main switch is pressed 

and held for 1.5 seconds or more, the sys-

tem turns on in constant speed control 

mode. (

P.255)

2

Accelerate or decelerate, with 
accelerator pedal operation, to the 
desired vehicle speed (at or above 
approximately 30 km/h [20 mph]) 
and press the “-SET” switch to set 
the speed.

Cruise control “SET” indicator will come 

on.
The vehicle speed at the moment the 

switch is released becomes the set speed.

Adjusting the set speed by the 
switch

To change the set speed, press the 
“+RES” or “-SET” switch until the 
desired set speed is displayed.

1

Increases the speed 
(Except when the vehicle has been 
stopped by system control in vehi-
cle-to-vehicle distance control 
mode)

2

Decreases the speed

Fine adjustment: Press the switch.
Large adjustment: Press and hold the 

Setting the vehicle speed (vehi-
cle-to-vehicle distance control 
mode)

Adjusting the set speed

253

4

4-5. Using the driving support systems

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switch to change the speed, and release 
when the desired speed is reached.

In the vehicle-to-vehicle distance con-
trol mode, the set speed will be 
increased or decreased as follows:

Fine adjustment: By 1 km/h (0.6 mph)

*1

 or 1 

mph (1.6 km/h)

*2

 each time the switch is 

pressed
Large adjustment: Increases or decreases 
in 5 km/h (3.1 mph)

*1

 or 5 mph (8 km/h)

*2

 

increments for as long as the switch is held

In the constant speed control mode 
(

P.255), the set speed will be 

increased or decreased as follows:

Fine adjustment: By 1 km/h (0.6 mph)

*1

 or 1 

mph (1.6 km/h)

*2

 each time the switch is 

pressed
Large adjustment: The speed will continue 
to change while the switch is held.

*1

: When the set speed is shown in “km/h”

*2

: When the set speed is shown in “MPH”

Increasing the set speed by the 
accelerator pedal

1

Accelerate with accelerator pedal 
operation to the desired vehicle 
speed

2

Press the “-SET” switch

Pressing the switch changes the vehi-
cle-to-vehicle distance as follows:

1

Long

2

Medium

3

Short

If a vehicle is running ahead of you, the pre-
ceding vehicle mark 

 will also be dis-

played.

Select a distance from the table below. 
Note that the distances shown corre-
spond to a vehicle speed of 80 km/h 
(50 mph). Vehicle-to-vehicle distance 
increases/decreases in accordance 
with vehicle speed. When the vehicle is 
stopped by system control, the vehicle 
stops at a certain vehicle-to-vehicle 
distance depending on the situation.

Changing the vehicle-to-vehicle 
distance (vehicle-to-vehicle dis-
tance control mode)

Vehicle-to-vehicle distance set-
tings (vehicle-to-vehicle dis-
tance control mode)

Distance options

Vehicle-to-vehicle 

distance

Long

Approximately 50 

m (160 ft.)

Medium

Approximately 40 

m (130 ft.)

Short

Approximately 30 

m (100 ft.)

A

254

4-5. Using the driving support systems

After the vehicle ahead of you starts 
off, press the “+RES” switch.
Your vehicle will also resume follow-
up cruising if the accelerator pedal is 
depressed after the vehicle ahead of 
you starts off.

1

Pressing the cancel switch cancels 
the speed control.

The speed control is also canceled when 
the brake pedal is depressed. 
(When the vehicle has been stopped by 
system control, depressing the brake pedal 

does not cancel the setting.)

2

Pressing the “+RES” switch 
resumes the cruise control and 
returns vehicle speed to the set 
speed.

When your vehicle is too close to a 
vehicle ahead, and sufficient automatic 
deceleration via the cruise control is 
not possible, the display will flash and 
the buzzer will sound to alert the 
driver. An example of this would be if 
another driver cuts in front of you while 
you are following a vehicle. Depress 
the brake pedal to ensure an appropri-
ate vehicle-to-vehicle distance.

Q

Warnings may not occur when

In the following instances, warnings 
may not occur even when the vehicle-
to-vehicle distance is small.

When the speed of the preceding 
vehicle matches or exceeds your 
vehicle speed

When the preceding vehicle is trav-
eling at an extremely slow speed

Immediately after the cruise control 

Resuming follow-up cruising 
when the vehicle has been 
stopped by system control (vehi-
cle-to-vehicle distance control 
mode)

Canceling and resuming the 
speed control

Approach warning (vehicle-to-
vehicle distance control mode)

255

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4-5. Using the driving support systems

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speed was set

When depressing the accelerator 
pedal

While driving in vehicle-to-vehicle dis-
tance control mode, this function will 
reduce the vehicle speed, if it is deter-
mined to be necessary.

Q

Function operation

When the steering wheel begins to be 
turned, the vehicle speed will begin 
being reduced. When the steering 
wheel is returned to the center posi-
tion, the vehicle speed reduction will 
end.
Depending on the situation, the vehicle 
speed will then return to the vehicle-to-
vehicle distance control mode set 
speed.
In situations where vehicle-to-vehicle 
distance control needs to operate, 
such as when a preceding vehicle cuts 
in front of your vehicle, the curve 
speed reduction function will be can-
celed.

Q

Operation display

Displayed when the vehicle speed is 
being reduced.

When the vehicle speed reduction ends, 
the display will disappear.

Q

Changing the settings of the curve 
speed reduction function

The curve speed reduction function 
can be enabled/disabled and the vehi-
cle speed reduction strength can be 
adjusted on 

 (

P.107) of the multi-

information display.

The setting will change each time the “OK” 
meter control switch is pressed.

When constant speed control mode is 
selected, your vehicle will maintain a 
set speed without controlling the vehi-
cle-to-vehicle distance. Select this 
mode only when vehicle-to-vehicle 
distance control mode does not func-
tion correctly due to a dirty radar, etc.

1

With the cruise control off, press 
and hold the cruise control main 
switch for 1.5 seconds or more.

Immediately after the switch is pressed, the 

dynamic radar cruise control indicator will 

come on. Afterwards, it switches to the 

cruise control indicator.
Switching to constant speed control mode 

is only possible when operating the switch 

Curve speed reduction function

Selecting constant speed con-
trol mode

256

4-5. Using the driving support systems

with the cruise control off.

2

Accelerate or decelerate, with 
accelerator pedal operation, to the 
desired vehicle speed (at or above 
approximately 30 km/h [20 mph]) 
and press the “-SET” switch to set 
the speed.

Cruise control “SET” indicator will come 

on.
The vehicle speed at the moment the 

switch is released becomes the set speed.
Adjusting the speed setting: 

P.252

Canceling and resuming the speed setting: 

P.254

When this function is enabled and the 
system is operating in vehicle-to-vehi-
cle distance control mode (

P.250), 

when a speed limit sign is detected, the 

recognized speed limit will be dis-
played with an up/down arrow. The set 
speed can be increased/reduced to 
the recognized speed limit by pressing 
and holding the “+RES”/“-SET” switch.

When the current set speed is lower 
than the recognized speed limit

Press and hold the “+RES” switch.

When the current set speed is 
higher than the recognized speed 
limit

Press and hold the “-SET” switch.

Dynamic Radar Cruise Control with 
Road Sign Assist can be enabled/dis-
abled in 

 on the multi-information 

display. (

P.107)

Dynamic Radar Cruise Control 
with Road Sign Assist (if 
equipped)

Enabling/Disabling the Dynamic 
Radar Cruise Control with Road 
Sign Assist (if equipped)

257

4

4-5. Using the driving support systems

Dr

ivin
g

When the Dynamic Radar Cruise 
Control with Road Sign Assist is oper-
ating, while driving down a hill, the 
vehicle speed may exceed the set 
speed.
In this case, the displayed set vehicle 
speed will be highlighted and a buzzer 
will sound to alert the driver.

Q

Dynamic radar cruise control with full-

speed range can be set when

O

The shift lever is in D.

O

The desired set speed can be set when 

the vehicle speed is approximately 30 

km/h (20 mph) or more. (However, 

when the vehicle speed is set while driv-

ing at below approximately 30 km/h [20 

mph], the set speed will be set to approxi-

mately 30 km/h [20 mph].)

Q

Accelerating after setting the vehicle 

speed

The vehicle can accelerate by operating the 

accelerator pedal. After accelerating, the 

set speed resumes. However, during vehi-

cle-to-vehicle distance control mode, the 

vehicle speed may decrease below the set 

speed in order to maintain the distance to 

the preceding vehicle.

Q

When the vehicle stops while follow-up 

cruising

O

Pressing the “+RES” switch while the 

vehicle ahead stops will resume follow-

up cruising if the vehicle ahead starts off 

within approximately 3 seconds after the 

switch is pressed.

O

If the vehicle ahead starts off within 3 sec-

onds after your vehicle stops, follow-up 

cruising will be resumed.

Q

Automatic cancelation of vehicle-to-

vehicle distance control mode

Vehicle-to-vehicle distance control mode is 

automatically canceled in the following situ-

ations.

O

VSC is activated.

O

TRC is activated for a period of time.

O

When the VSC or TRC system is turned 

off.

O

The sensor cannot detect correctly 

because it is covered in some way.

O

When the brake control or output 

restriction control of a driving support 

system operates. (For example: Pre-Col-

lision System, Drive-Start Control)

O

The parking brake is operated.

O

The vehicle is stopped by system control 

on a steep incline.

O

The following are detected when the 

vehicle has been stopped by system con-

trol:

• The driver is not wearing a seat belt.

• The driver’s door is opened.

• The vehicle has been stopped for about 3 

minutes

If vehicle-to-vehicle distance control mode 
is automatically canceled for any reasons 
other than the above, there may be a mal-
function in the system. Contact any autho-
rized Lexus retailer or Lexus authorized 
repairer, or any reliable repairer.

Q

Automatic cancelation of constant 

speed control mode

Constant speed control mode is automati-

cally canceled in the following situations:

O

Actual vehicle speed is more than 

approximately 16 km/h (10 mph) below 

the set vehicle speed.

O

Actual vehicle speed falls below approxi-

mately 30 km/h (20 mph).

O

VSC is activated.

O

TRC is activated for a period of time.

O

When the VSC or TRC system is turned 

off.

O

When the brake control or output 

restriction control of a driving support 

system operates. (For example: Pre-Col-

lision System, Drive-Start Control)

O

The parking brake is operated.

If constant speed control mode is automati-

258

4-5. Using the driving support systems

cally canceled for any reasons other than 
the above, there may be a malfunction in 
the system. Contact any authorized Lexus 
retailer or Lexus authorized repairer, or any 
reliable repairer.

Q

The Dynamic Radar Cruise Control 

with Road Sign Assist may not operate 

properly when

As the Dynamic Radar Cruise Control with 

Road Sign Assist may not operate properly 

in conditions in which RSA may not operate 

or detect correctly (

P.247), when using 

this function, make sure to check the speed 

limit sign displayed.
In the following situations, the set speed 

may not be changed to the recognized 

speed limit by pressing and holding the 

“+RES”/“-SET” switch.

O

If speed limit information is not available

O

When the recognized speed limit is the 

same as the set speed

O

When the recognized speed limit is out-

side of the speed range that the dynamic 

radar cruise control system can operate

Q

Situations in which the curve speed 

reduction function may not operate

In situations such as the following, the curve 

speed reduction function may not operate:

O

When the vehicle is being driven around 

a gentle curve.

O

When the accelerator pedal is being 

depressed.

O

When the vehicle is being driven around 

an extremely short curve.

Q

Brake operation

A brake operation sound may be heard and 

the brake pedal response may change, but 

these are not malfunctions.

Q

Warning messages and buzzers for 

dynamic radar cruise control with full-

speed range

Warning messages and buzzers are used to 

indicate a system malfunction or to inform 

the driver of the need for caution while driv-

ing. If a warning message is shown on the 

multi-information display, read the message 

and follow the instructions. (

P.222, 415)

Q

When the sensor may not be correctly 

detecting the vehicle ahead

In the case of the following and depending 

on the conditions, operate the brake pedal 

when deceleration of the system is insuffi-

cient or operate the accelerator pedal 

when acceleration is required.
As the sensor may not be able to correctly 

detect these types of vehicles, the approach 

warning (

P.254) may not be activated.

O

Vehicles that cut in suddenly

O

Vehicles traveling at low speeds

O

Vehicles that are not moving in the same 

lane

O

Vehicles with small rear ends (trailers 

with no load on board, etc.)

O

Motorcycles traveling in the same lane

O

When water or snow thrown up by the 

surrounding vehicles hinders the detect-

ing of the sensor

O

When your vehicle is pointing upwards 

(caused by a heavy load in the luggage 

compartment, etc.)

O

Preceding vehicle has an extremely high 

ground clearance

 

 

 

 

 

 

 

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