LEXUS NX 300H (2019 year). Instruction - part 13


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LEXUS NX 300H (2019 year). Instruction - part 13




4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


Enabling/disabling the pre-colli-
sion system

The pre-collision system can be 
enabled/disabled on the multi-informa-
tion display as following:

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


Press “

” or “

” of meter con-

trol switches and select 



Press “

” or “

” of meter con-

trol switches and select 

, and 

press .


Press “

” or “

” of meter con-

trol switches and select “PCS”, and 

 to select the desired set-

ting (on/off).

If the system is disabled, the PCS warn-
ing light will turn on and a message will 
be displayed on the multi-information 

Changing the pre-collision warn-
ing timing

The pre-collision warning timing can 
be changed on the multi-information 
display as following:

The operation timing setting is retained 
when the power switch is turned off.


Press “

” or “

” of meter con-

trol switches and select 



Press “

” or “

” of meter con-

trol switches and select 

, and 

press .


Press “

” or “

” of meter con-

trol switches and select “Sensitiv-
ity”, and press 

 to select the 

desired setting.


When a compact spare tire or an 

emergency tire puncture repair kit is 


If equipment (snow plow, etc.) that may 

obstruct the radar sensor or camera 

sensor is temporarily installed to the 


Changing settings of the pre-col-
lision system


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-






The warning will begin to operate earlier 
than with the default timing.



This is the default setting.



The warning will begin to operate later 
than with the default timing.

Operational conditions

The pre-collision system is enabled and the 

system determines that the possibility of a 

frontal collision with a vehicle or pedestrian 

is high.

Each function is operational at the following 


Pre-collision warning:

• Vehicle speed is between approximately 

7 and 110 mph (10 and 180 km/h). (For 

detecting a pedestrian, vehicle speed is 

between approximately 7 and 50 mph 

[10 and 80 km/h].)

• The relative speed between your vehicle 

and the vehicle or pedestrian ahead is 

approximately 7 mph (10 km/h) or more.

Pre-collision brake assist:

• Vehicle speed is between approximately 

20 and 110 mph (30 and 180 km/h). (For 

detecting a pedestrian, vehicle speed is 

between approximately 20 and 50 mph 

[30 and 80 km/h].)

• The relative speed between your vehicle 

and the vehicle or pedestrian ahead is 

approximately 20 mph (30 km/h) or 


Pre-collision braking:

• Vehicle speed is between approximately 

7 and 110 mph (10 and 180 km/h). (For 

detecting a pedestrian, vehicle speed is 

between approximately 7 and 50 mph 

[10 and 80 km/h].)

• The relative speed between your vehicle 

and the vehicle or pedestrian ahead is 

approximately 7 mph (10 km/h) or more.

The system may not operate in the following 


If a 12-volt battery terminal has been dis-

connected and reconnected and then the 

vehicle has not been driven for a certain 

amount of time

If the shift lever is in R

If VSC is disabled (only the pre-collision 

warning function will be operational)

Pedestrian detection function

The pre-collision system detects pedestri-

ans based on the size, profile, and motion of 

a detected object. However, a pedestrian 

may not be detected depending on the sur-

rounding brightness and the motion, pos-

ture, and angle of the detected object, 

preventing the system from operating prop-

erly. (


Cancelation of the pre-collision braking

If either of the following occur while the 

pre-collision braking function is operating, it 

will be canceled:

The accelerator pedal is depressed 


The steering wheel is turned sharply or 



4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


Conditions under which the system may 

operate even if there is no possibility of a 


In some situations such as the following, 

the system may determine that there is a 

possibility of a frontal collision and oper-


• When passing a vehicle or pedestrian

• When changing lanes while overtaking a 

preceding vehicle

• When overtaking a preceding vehicle 

that is changing lanes

• When overtaking a preceding vehicle 

that is making a left/right turn

• When passing a vehicle in an oncoming 

lane that is stopped to make a right/left 


• When driving on a road where relative 

location to vehicle ahead in an adjacent 

lane may change, such as on a winding 


• When rapidly closing on a vehicle ahead

• If the front of the vehicle is raised or low-

ered, such as when the road surface is 

uneven or undulating

• When approaching objects on the road-

side, such as guardrails, utility poles, 

trees, or walls

• When there is a vehicle, pedestrian, or 

object by the roadside at the entrance of 

a curve

• When driving on a narrow path sur-

rounded by a structure, such as in a tun-

nel or on an iron bridge

• When there is a metal object (manhole 

cover, steel plate, etc.), steps, or a protru-

sion on the road surface or roadside

• When a crossing pedestrian approaches 

very close to the vehicle

• When passing through a place with a low 

structure above the road (low ceiling, 

traffic sign, etc.)

• When passing under an object (billboard, 

etc.) at the top of an uphill road


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-




• When rapidly closing on 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 the vehicle, such as thick 

grass, tree branches, or a banner

• When the vehicle is hit by water, snow, 

dust, etc. from a vehicle ahead

• When driving through steam or smoke

• When there are patterns or paint on the 

road or a wall that may be mistaken for a 

vehicle or pedestrian

• When driving near an object that reflects 

radio waves, such as a large truck or 


• 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

Situations in which the system may not 

operate properly

In some situations such as the following, a 

vehicle may not be detected by the radar 

sensor and camera sensor, preventing 

the system from operating properly:

• If an oncoming vehicle is approaching 

your vehicle

• If a vehicle ahead is a motorcycle or bicy-


• When approaching the side or front of a 


• 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 is carrying a load which 

protrudes past its rear bumper

• If a vehicle ahead has extremely high 

ground clearance

• If a vehicle ahead is irregularly shaped, 

such as a tractor or side car

• If the sun or other light is shining directly 

on a vehicle ahead

• If a vehicle cuts in front of your vehicle or 

emerges from beside a vehicle

• If a vehicle ahead makes an abrupt 

maneuver (such as sudden swerving, 

acceleration or deceleration)

• When suddenly cutting behind a preced-

ing vehicle

• When a vehicle ahead is not directly in 

front of your vehicle

• When driving in inclement weather such 

as heavy rain, fog, snow or a sandstorm

• When the vehicle is hit by water, snow, 

dust, etc. from a vehicle ahead

• When driving through steam or smoke

• When driving in a place where the sur-


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


rounding brightness changes suddenly, 

such as at the entrance or exit of a tunnel

• When a very bright light, such as the sun 

or the headlights of oncoming traffic, 

shines directly into the camera sensor

• When the surrounding area is dim, such 

as at dawn or dusk, or while at night or in 

a tunnel

• After the hybrid system has 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 low-


• If the wheels are misaligned

• If a wiper blade is blocking the camera 


• The vehicle is wobbling.

• The vehicle is being driven at extremely 

high speeds.

• When driving on a hill

• If the radar sensor or camera sensor is 


In some situations such as the following, 

sufficient braking 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 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

Some pedestrians such as the following 

may not be detected by the radar sensor 

and camera sensor, preventing the sys-

tem from operating properly:

• Pedestrians shorter than approximately 

3.2 ft. (1 m) or taller than approximately 

6.5 ft. (2 m)

• Pedestrians wearing oversized clothing 

(a rain coat, long skirt, etc.), making their 

silhouette obscure

• Pedestrians who are carrying large bag-

gage, holding an umbrella, etc., hiding 

part of their body

• Pedestrians who are bending forward or 


• Pedestrians who are pushing a stroller, 

wheelchair, bicycle or other vehicle

• Groups of pedestrians which are close 


• Pedestrians who are wearing white and 

look extremely bright

• Pedestrians in the dark, such as at night 

or while in a tunnel

• Pedestrians whose clothing appears to 

be nearly the same color or brightness as 

their surroundings

• Pedestrians near walls, fences, guardrails, 

or large objects

• Pedestrians who are on a metal object 

(manhole cover, steel plate, etc.) on the 


• Pedestrians who are walking fast

• Pedestrians who are changing speed 


• Pedestrians running out from behind a 

vehicle or a large object

• Pedestrians who are extremely close to 

the side of the vehicle (outside rear view 

mirror, etc.)

If the PCS warning light flashes or illumi-

nates and a warning message is dis-

played on the multi-information display

The pre-collision system may be temporar-

ily unavailable or there may be a malfunc-

tion in the system.

In the following situations, the warning 

light will turn off, the message will disap-

pear and the system will become opera-

tional when normal operating conditions 


• When the radar sensor or camera sensor 

or the area around either sensor is hot, 

such as in the sun

• When the radar sensor or camera sensor 

or the area around either sensor is cold, 

such as in an extremely cold environment

• When a front sensor is dirty or covered 


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-




with snow, etc.

• When the part of the windshield in front 

of the camera sensor is fogged up or cov-

ered with condensation or ice (Defog-

ging the windshield: 


• If the camera sensor is obstructed, such 

as when the hood is open or a sticker is 

attached to the windshield near the cam-

era sensor

If the PCS warning light continues to flash 

or remains illuminated or the warning 

message does not disappear even 

though the vehicle has returned to nor-

mal, the system may be malfunctioning. 

Have the vehicle inspected by your Lexus 

dealer immediately.

If VSC is disabled

If VSC is disabled (

P.251), 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.

Lane departure alert function

When the system determines that the 
vehicle might depart from its lane, a 
warning is displayed on the multi-infor-
mation display, and either the warning 
buzzer sounds or the steering wheel 
vibrates to alert the driver.

When the warning buzzer sounds or the 
steering wheel vibrates, check the sur-
rounding road situation and carefully oper-
ate the steering wheel to move the vehicle 
back to the center of the lane.

LDA (Lane Departure Alert 
with steering control)

When driving on highways and 
freeways with white (yellow) lines, 
this function alerts the driver when 
the vehicle might depart from its 
lane and provides assistance by 
operating the steering wheel to 
keep the vehicle in its lane.
The LDA system recognizes visible 
white (yellow) lines with the camera 
sensor on the upper portion of the 

Functions included in LDA sys-


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


Steering control function

When the system determines that the 
vehicle might depart from its lane, the 
system provides assistance as neces-
sary 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 
warning buzzer sounds.

Vehicle sway warning function

When the vehicle is swaying or 
appears as if it may depart from its lane 
multiple times, the warning buzzer 
sounds and a message is displayed on 
the multi-information display to alert 
the driver.


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-




Press the LDA switch to turn the LDA 
system on.

The LDA indicator illuminates and a mes-
sage is displayed on the multi-information 
Press the LDA switch again to turn the 
LDA system off.
When the LDA system is turned on or off, 
operation of the LDA system continues in 


Before using LDA system

Do not rely solely upon the LDA system. 

The LDA system does not automatically 

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 driv-

ing safely by paying careful attention to 

the surrounding conditions and operat-

ing 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.

To avoid operating LDA system by 


When not using the LDA system, use the 

LDA switch to turn the system off.

Situations unsuitable for LDA system

Do not use the LDA system in the follow-

ing situations. 

The system may not operate properly 

and lead to an accident, resulting in 

death or serious injury.

A spare tire, tire chains, etc. are 


When the tires have been excessively 

worn, or when the tire inflation pres-

sure is low.

Tires which differ by structure, manu-

facturer, brand or tread pattern are 


Objects or patterns that could be mis-

taken for white (yellow) lines are pres-

ent on the side of the road (guardrails, 

curbs, reflective poles, etc.).

Vehicle is driven on a snow-covered 


White (yellow) lines are difficult to see 

due to rain, snow, fog, dust, etc.

Asphalt repair marks, white (yellow) 

line marks, etc. are present due to road 


Vehicle is driven in a temporary lane or 

restricted lane due to construction 


Vehicle is driven on a road surface 

which is slippery due to rainy weather, 

fallen snow, freezing, etc.

Vehicle is driven in traffic lanes other 

than on highways and freeways.

Vehicle is driven in a construction 


Vehicle is towing a trailer or another 


Preventing LDA system malfunctions 

and operations performed by mistake

Do not modify the headlights or place 

stickers, etc. on the surface of the 


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, 


If your windshield needs repairs, con-

tact your Lexus dealer.

Turning LDA system on


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


the same condition the next time the hybrid 
system is started.

LDA indicator

The illumination condition of the indicator 
informs the driver of the system operation 
Illuminated in white:
LDA system is operating.
Illuminated in green:
Steering wheel assistance of the steering 
control function is operating.
Flashing in orange:

Lane departure alert function is operating.

Operation display of steering 
wheel operation support

Indicates that steering wheel assistance of 
the steering control function is operating.

Lane departure alert function dis-

Displayed when the multi-information dis-
play is switched to the driving assist system 
information screen.

Inside of displayed white lines is 

Indicates that the system is recognizing 
white (yellow) lines. When the vehicle 
departs from its lane, the white line dis-
played on the side the vehicle departs from 
flashes orange.

Inside of displayed white lines is 

Indicates that the system is not able to rec-
ognize white (yellow) lines or is temporar-
ily canceled.

Indications on multi-information 





4-5. Using the driving support systems

LEXUS NX300h Owners Manu-




Operation conditions of each function

Lane departure alert function

This function operates when all of the fol-
lowing conditions are met.
• LDA is turned on.

• Vehicle speed is approximately 32 mph 

(50 km/h) or more.

• System recognizes white (yellow) lines.

• Width of traffic lane is approximately 9.8 

ft. (3 m) or more.

• Turn signal lever is not operated.

• Vehicle is driven on a straight road or 

around a gentle curve with a radius of 

more than approximately 492 ft. (150 m).

• No system malfunctions are detected. 



Steering control function

This function operates when all of the fol-
lowing conditions are met in addition to the 
operation conditions for the lane departure 
alert function.
• Setting  for  “Steering  Assist” in 

 of the 

multi-information display is set to “On”. 


• Vehicle is not accelerated or decelerated 

by a certain amount or more.

• Steering wheel is not operated with a 

steering force level suitable for changing 


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


• TRAC or VSC is not turned off.

• Hands off steering wheel warning is not 

displayed. (


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”. 


• 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. 



Temporary cancelation of functions

When the operation conditions are no lon-

ger met, a function may be temporarily can-

celed. However, when the operation 

conditions are met again, operation of the 

function is automatically restored.

Steering control function

Depending on the vehicle speed, lane 

departure situation, road conditions, etc., 

the driver may not feel the function is oper-

ating or the function may not operate at all.

Lane departure alert function

The warning buzzer may be difficult to hear 

due to external noise, audio playback, etc. 

Also, it may be difficult to feel steering 

wheel vibrations due to the road conditions 


Hands off steering wheel warning

When the system determines that the driver 

has removed their hands from the steering 

wheel while the steering control function is 

operating, 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 display.

If the driver continues to keep their hands 

off of the steering wheel, a buzzer sounds 

and a warning message and the symbol 

shown in the illustration are displayed on 

the multi-information display. This warning 

also operates in the same way when the 

driver continuously operates the steering 

wheel only a small amount. Always keep 

your hands on the steering wheel when 

using this system, regardless of warnings.

Depending on the vehicle and road condi-

tions, the warning may not operate.

Vehicle sway warning function

When the system determines that the vehi-

cle is swaying while the vehicle sway warn-


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


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.

White (yellow) lines are only on one side 

of road

The LDA system will not operate for the 

side on which white (yellow) lines could not 

be recognized.

Conditions in which functions may not 

operate properly

In the following situations, the camera sen-

sor may not detect white (yellow) lines and 

various functions may not operate normally.

There are shadows on the road that run 

parallel with, or cover, the white (yellow) 


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, 


The vehicle is driven on a bright surface, 

such as concrete.

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 oncoming 

vehicle, the sun, etc. enters the camera.

The vehicle is driven where the road 

diverges, merges, etc.

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 vehicle is driven around a sharp 


The traffic lane is excessively narrow or 


The vehicle is extremely tilted due to car-

rying 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 


The headlight lenses are dirty and emit a 

faint amount of light at night, or the beam 

axis has deviated.

The vehicle is struck by a crosswind.

The vehicle has just changed lanes or 

crossed an intersection.

Snow tires, etc. are equipped.

Warning message

If the following warning message is dis-

played on the multi-information display and 

the LDA indicator illuminates in orange, fol-

low the appropriate troubleshooting proce-



4-5. Using the driving support systems

LEXUS NX300h Owners Manu-




Warning message


“Lane Departure 

Alert Malfunction 

Visit Your Dealer”

The system may not 
be operating prop-
 Have the vehicle 

inspected at 
your Lexus 

“Front Camera 


Remove Debris On 


Dirt, rain, conden-
sation, ice, snow, 
etc. are present on 
the windshield in 
front of the camera 
 Turn the LDA 

system off, 
remove any dirt, 
rain, condensa-
tion, ice, snow, 
etc. from the 
windshield, and 
then turn the 
LDA system 
back on.

“Front Camera 


The operation con-
ditions of the cam-
era sensor 
(temperature, etc.) 
are not met.
 When the opera-

tion conditions 
of the camera 
sensor (tem-
perature, etc.) 
are met, the LDA 
system will 
become avail-
able. Turn the 
LDA system off, 
wait for a little 
while, and then 
turn the LDA 
system back on.

Warning message



4-5. Using the driving support systems

LEXUS NX300h Owners Manu-


If a different warning message is displayed, 

follow the instructions displayed on the 



The following settings can be changed.

For how to change settings, refer to P.421.

“Lane Departure 

Alert Unavailable”

The LDA system is 
temporarily can-
celed due to a mal-
function in a sensor 
other than the cam-
era sensor.
 Turn the LDA 

system off and 
follow the appro-
priate trouble-
procedures for 
the warning 
message. After-
ward, drive the 
vehicle for a 
short time, and 
then turn the 
LDA system 
back on.

“Lane Departure 

Alert Unavailable 

Below Approx 


The LDA system 
cannot be used as 
the vehicle speed is 
less than approxi-
mately 32 mph (50 
 Drive the vehicle 

at approxi-
mately 32 mph 
(50 km/h) or 


Setting details

Lane departure alert 


Adjust alert sensitiv-


Adjust alert type

Warning message


Steering control 


Turn steering wheel 

assistance on and off

Vehicle sway warn-

ing function

Turn function on and 


Adjust alert sensitiv-



Setting details


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-





Set speed
Vehicle-to-vehicle distance switch
Cruise control 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 (


 Constant speed control mode 



System Components



Before using dynamic radar cruise 

control with full-speed range

Driving safely is the sole responsibility of 

the driver. Do not rely solely on the sys-

tem, and drive safely by always paying 

careful attention to your surroundings.

The dynamic radar cruise control with 

full-speed range provides driving assis-

tance to reduce the driver’s burden. 

However, there are limitations to the 

assistance provided.

Set the speed appropriately depending 

on the speed limit, traffic flow, road con-

ditions, weather conditions, etc. The 

driver is responsible for checking the set 


Even when the system is functioning nor-

mally, the condition of the preceding 

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 on this 

system or assuming the system ensures 

safety while driving can lead to an acci-

dent, resulting in death or serious injury.

Cautions regarding the driving assist 


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.




4-5. Using the driving support systems

LEXUS NX300h Owners Manu-



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.

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.

Assisting the driver to operate the 


The dynamic radar cruise control with 

full-speed range has limited capability 

to prevent or avoid a collision with a 

vehicle traveling ahead. Therefore, if 

there is ever any danger, the driver 

must take immediate and direct con-

trol of the vehicle and act appropri-

ately in order to ensure the safety of all 


To avoid inadvertent dynamic radar 

cruise control with full-speed range 


Switch the dynamic radar cruise control 

with full-speed range off using the “ON/

OFF” button when not in use.

Situations unsuitable for dynamic 

radar cruise control with full-speed 


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 acci-

dent resulting in death or serious injury.

Roads where there are pedestrians, 

cyclists, etc.

In heavy traffic

On roads with sharp bends

On winding roads

On slippery roads, such as those cov-

ered with rain, ice or snow

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.

At entrances to freeways and highways

When weather conditions are bad 

enough that they may prevent the sen-

sors from detecting correctly (fog, 

snow, sandstorm, heavy rain, etc.)

When there is rain, snow, etc. on the 

front surface of the radar sensor or 

camera sensor

In traffic conditions that require fre-

quent repeated acceleration and 


When your vehicle is towing a trailer 

or during emergency towing

When an approach warning buzzer is 

heard often


4-5. Using the driving support systems

LEXUS NX300h Owners Manu-




This mode employs a radar sensor to detect the presence of vehicles up to approx-
imately 328 ft. (100 m) ahead, determines the current vehicle-to-vehicle following 
distance, and operates to maintain a suitable following distance from the vehicle 

Note that vehicle-to-vehicle distance will close in when traveling on downhill slopes.

Example of constant speed cruising
When there are no vehicles ahead

The vehicle travels at the speed set by the driver. The desired vehicle-to-vehicle distance 
can also be set by operating the vehicle-to-vehicle distance switch.

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, pushing the cruise control lever up or 
depressing the accelerator pedal will resume follow-up cruising.

Example of acceleration
When there are no longer any preceding vehicles driving slower than the set 

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

Driving in vehicle-to-vehicle distance control mode











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