steering LEXUS NX300H 2019 Service Manual

2094-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
4
Driving
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: P.267)
• 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 ligh t 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
windshield.
Functions included in LDA sys-
tem

2104-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
■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 detect s 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.

2114-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
4
Driving
Press the LDA switch to turn the LDA
system on.
The LDA indicator illuminates and a mes-
sage is displayed on the multi-information
display.
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
WARNING
■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
mistake
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
equipped.
●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
used.
●Objects or patterns that could be mis-
taken for white (yellow) lines are pres-
ent on the side of th e road (guardrails,
curbs, reflective poles, etc.).
●Vehicle is driven on a snow-covered
road.
●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
repair.
●Vehicle is driven in a temporary lane or
restricted lane due to construction
work.
●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
zone.
●Vehicle is towing a trailer or another
vehicle.
■Preventing LDA 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.
Turning LDA system on

2124-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_enthe 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
status.
Illuminated in white:
LDA system is operating.
Illuminated in green:
Steering wheel assistan
ce 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 fu nction is operating.
Lane departure alert function dis-
play
Displayed when the multi-information dis-
play is switched to the driving assist system
information screen.
Inside of displayed white lines is
white
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
black
Indicates that the system is not able to rec-
ognize white (yellow) lines or is temporar-
ily canceled.
Indications on multi-information
display
A
B
C

2134-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
4
Driving
■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. ( P.214)
●Steering control function
This function operates when all of the fol-
lowing conditions are me t 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”.
( P.86)
• Vehicle is not accelerated or decelerated
by a certain amount or more.
• Steering wheel is not operated with a
steering force level su itable 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.213)
●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.86)
• 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.214)
■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 agai n, 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 diffic ult to feel steering
wheel vibrations due to the road conditions
etc.
■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 stee ring wheel, a buzzer sounds
and a warning message and the symbol
shown in the illustration are displayed on
the multi-information di splay. 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-

2164-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_enIf a different warning message is displayed,
follow the instructions
displayed on the
screen.
■Customization
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-
shooting
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 50km/h”
The LDA system
cannot be used as
the vehicle speed is
less than approxi-
mately 32 mph (50
km/h).
 Drive the vehicle
at approxi-
mately 32 mph
(50 km/h) or
more.
FunctionSetting details
Lane departure alert
functionAdjust alert sensitiv- ity
Adjust alert type
Warning messageDetails/Actions
Steering control functionTurn steering wheel
assistance on and off
Vehicle sway warn- ing function
Turn function on and off
Adjust alert sensitiv-ity
FunctionSetting details

2254-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
4
Driving
and follow the instructions.
■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.222) may not be activated.
●Vehicles that cut in suddenly
●Vehicles traveling at low speeds
●Vehicles that are not moving in the same
lane
●Vehicles with small rear ends (trailers
with no load on board, etc.)
●Motorcycles travelin g in the same lane
●When water or snow thrown up by the
surrounding vehicles hinders the detect-
ing of the sensor
●When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.)
●Preceding vehicle has an extremely high
ground clearance
■Conditions under which the vehicle-to-
vehicle distance control mode may not
function correctly
In the case of the following conditions,
operate the brake pedal (or accelerator
pedal, depending on the situation) as nec-
essary.
As the sensor may not be able to correctly
detect vehicles ahead, the system may not
operate properly.
●When the road curves or when the lanes
are narrow
●When steering wheel operation or your
position in the lane is unstable
●When the vehicle ahead of you deceler-
ates suddenly
●When driving on a road surrounded by a
structure, such as in a tunnel or on a
bridge
●While the vehicle speed is decreasing to
the set speed after the vehicle acceler-
ates by depressing the accelerator pedal

2494-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
4
Driving
Assists acceleration response by con-
trolling the hybrid system and steering.
Suitable for when precise handling is desir-
able, for example when driving on moun-
tain roads.
When not in Sport mode and the driving
mode select switch is turned to the right,
“Sport” indicator will be shown on the
multi-information display and the hybrid
system indicator changes to the tachome-
ter. ( P.79)
■Operation of the air conditioning sys-
tem in Eco mode
Eco mode controls the heating/cooling
operations and fan speed of the air condi-
tioning system to enhance fuel efficiency. To
improve air conditio ning performance,
adjust the fan speed or turn off Eco mode.
■When canceling Eco mode/Sport mode
●Select another driving mode. Also, Sport
mode will be canceled automatically
when the power switch is turned off.
●Normal mode and Eco mode will not be
canceled automatically until another driv-
ing mode is selected, even if the power
switch is turned off.
■ECB (Electronically Controlled
Brake System)
The electronically controlled system
generates braking force correspond-
ing to the brake operation
■ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the
brakes are applied suddenly, or if the
brakes are applied while driving on a
slippery road surface
■Brake assist
Generates an increased level of brak-
ing force after the brake pedal is
depressed when the system detects a
panic stop situation
■VSC (Vehicle Stability Control)
Helps the driver to control skidding
when swerving sudden ly or turning on
slippery road surfaces
■Enhanced VSC (Enhanced Vehi-
cle Stability Control)
Provides cooperative control of the
ABS, TRAC, VSC and EPS.
Driving assist systems
To keep driving safety and perfor-
mance, the following systems oper-
ate automatically in response to
various driving situations. Be aware,
however, that these systems are
supplementary and should not be
relied upon too heavily when oper-
ating the vehicle.
Summary of the driving assist
systems

2504-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
Helps to maintain directional stability
when swerving on slippery road sur-
faces by controlling steering perfor-
mance.
■Trailer Sway Control
Helps the driver to control trailer sway
by selectively applying brake pressure
for individual wheels and reducing
driving torque when trailer sway is
detected.
■TRAC (Traction Control)
Helps to maintain drive power and pre-
vent the drive wheels from spinning
when starting the vehicle or accelerat-
ing on slippery roads
■Hill-start assist control
Helps to reduce the backward move-
ment of the vehicle when starting on an
uphill
■EPS (Electric Power Steering)
Employs an electric motor to reduce
the amount of effort needed to turn the
steering wheel
■E-Four
Electronic On-Demand AWD system.
Automatically switches from front-
wheel drive to all-wheel drive (AWD)
according to the driving conditions,
helping to ensure reliable handling and
stability. Examples of conditions where
the system will switch to AWD are
when cornering, goin g uphill, starting
off or accelerating, and when the road
surface is slippery due to snow, rain,
etc.
■PCS (Pre-Collision System)
 P.202
■BSM (Blind Spot Monitor) (if
equipped)
 P.241
■When the TRAC/VSC/ABS/Trailer
Sway Control systems are operating
The slip indicator light will flash while the
TRAC/VSC/ABS/Trailer Sway Control
systems are operating.
■Disabling the TRAC system
If the vehicle gets stuck in mud, dirt or snow,
the TRAC system may reduce power from
the hybrid system to the wheels. Pressing to turn the system off may make it eas-
ier for you to rock the vehicle in order to
free it.
To turn the TRAC system off, quickly press
and release .
The “Traction Co ntrol Turned Off” will be
shown on the multi-information display.
Press again to turn the system back on.

2514-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_M78287_en
4
Driving
■Turning off both TR AC, VSC and Trailer
Sway Control systems
To turn the TRAC, VSC and Trailer Sway
Control systems off, press and hold for
more than 3 seconds while the vehicle is
stopped.
The VSC off indicator will come on and the
“Traction Control Turned Off” will be shown
on the multi-information display.
*
Press again to turn the systems back on.
*: On vehicles with pre-collision system,
pre-collision brake assist and pre-colli-
sion braking will also be disabled. The
PCS warning light will come on and the
message will be shown on the multi-infor-
mation display. ( P.209)
■When the message is displayed on the
multi-information display showing that
TRAC has been disabled even if has
not been pressed
TRAC cannot be operated. Contact your
Lexus dealer.
■Sounds and vibrations caused by the
ABS, brake assist, VSC, Trailer Sway
Control, TRAC and hi ll-start assist con-
trol systems
●A sound may be heard from the engine
compartment when the brake pedal is
depressed repeatedly, when the hybrid
system is started or just after the vehicle
begins to move. This sound does not indi- cate that a malfunction has occurred in
any of these systems.
●Any of the following conditions may
occur when the above systems are oper-
ating.
None of these indicates that a malfunc-
tion has occurred.
• Vibrations may be felt through the vehicle
body and steering.
• A motor sound may be heard also after the vehicle comes to a stop.
■ECB operating sound
ECB operating sound may be heard in the
following cases, but it does not indicate that
a malfunction has occurred.
●Operating sound heard from the engine
compartment when the brake pedal is
operated.
●Motor sound of the brake system heard
from the front part of the vehicle when
the driver’s door is opened.
●Operating sound heard from the engine
compartment when one or two minutes
passed after the stop of the hybrid sys-
tem.
■EPS operation sound
When the steering wheel is operated, a
motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
■Reduced effectiveness of the EPS sys-
tem
The effectiveness of the EPS system is
reduced to prevent the system from over-
heating when there is frequent steering
input over an extended period of time. The
steering wheel may feel heavy as a result.
Should this occur, re frain from excessive
steering input or stop the vehicle and turn
the hybrid system off. The EPS system
should return to normal within 10 minutes.
■Automatic reactivation of TRAC, Trailer
Sway Control and VSC systems
After turning the TARC, Trailer Sway Con-
trol and VSC systems off, the systems will
be automatically re-enabled in the following
situations:
●When the power switch is turned off
●If only the TRAC system is turned off, the