ECU LEXUS NX300h 2018 Service Manual

1173-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manu-
al_USA_OM78212U 3
Before driving ■
Customization
Settings (e.g. back door automatic open
and stop position) can be changed. (Cus-
tomizable features: → P.427)
WARNING■
Back door closer●
In the event that the back door is left
slightly open, the back door closer will
automatically close it to the fully closed
position. It takes several seconds
before the back door closer begins to
operate. Be careful not to catch fingers
or anything else in the back door, as
this may cause bone fractures or other
serious injuries.
●
Use caution when using the back door
closer as it still operates when the
power back door system is canceled.
■
Power back door
Observe the following precautions when
operating the power back door.
Failure to do so may cause death or seri-
ous injury.
●
Check the safety of the surrounding
area to make sure there are no obsta-
cles or anything that could cause any
of your belongings to get caught. ●
If anyone is in the vicinity, make sure
they are safe and let them know that
the back door is about to open or
close. ●
If the power back door system is
turned off with the main switch while
the back door is operating automati-
cally, the automatic operation is
stopped. The back door then has to be
operated manually. Take extra care
when on an incline, as the back door
may open or close unexpectedly. ●
If the operating conditions of the
power back door are no longer met, a
buzzer may sound and the back door
may stop opening or closing. The back
door then has to be operated manu-
ally. Take extra care when on an incline,
as the back door may open or close
abruptly. ●
On an incline, the back door may sud-
denly shut after it opens. Make sure
the back door is fully open and secure. ●
In the following situations, the power
back door may detect an abnormality
and automatic operation may be
stopped. In this case, the back door
has to be operated manually. Take
extra care when on an incline, as the
back door may open or close abruptly.
• When the back door contacts an
obstacle
• When the 12-volt battery voltage sud-
denly drops, such as when the power
switch is turned to power ON mode or
the hybrid system is started during
automatic operation
●
If a bicycle carrier or similar heavy
object is attached to the back door, the
power back door may not operate,
causing itself to malfunction, or the
back door may suddenly shut again
after being opened, causing some-
one’s hands, head or neck to be caught
and injured. When installing an acces-
sory part to the back door, using a
genuine Lexus part is recommended.

124 3-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manu-
al_USA_OM78212U emit radio waves
• Portable radio, cellular phone, cordless
phone or other wireless communication
devices
• Another vehicle’s electronic key or a
wireless key that emits radio waves
• Personal computers or personal digital
assistants (PDAs)
• Digital audio players
• Portable game systems ●
If window tint with a metallic content or
metallic objects are attached to the rear
window●
When the electronic key is placed near a
battery charger or electronic devices■
Note for the entry function●
Even when the electronic key is within the
effective range (detection areas), the sys-
tem may not operate properly in the fol-
lowing cases:
• The electronic key is too close to the win-
dow or outside door handle, near the
ground, or in a high place when the doors
are locked or unlocked.
• The electronic key is near the ground or
in a high place, or too close to the rear
bumper center when the back door is
opened.
• The electronic key is on the instrument
panel, luggage room, floor, or in the door
pockets or glove box when the hybrid
system is started or power switch modes
are changed.●
Do not leave the electronic key on top of
the instrument panel or near the door
pockets when exiting the vehicle.
Depending on the radio wave reception
conditions, it may be detected by the
antenna outside the cabin and the door
will become lockable from the outside,
possibly trapping the electronic key
inside the vehicle.
●
As long as the electron ic key is within the
effective range, the doors may be locked
or unlocked by anyone.
●
Even if the electronic key is not inside the
vehicle, it may be possible to start the
hybrid system if the electronic key is near
the window.
●
The doors may unlock if a large amount
of water splashes on the door handle, such as in the rain or in a car wash when
the electronic key is within the effective
range. (The door will automatically be
locked after approximately 60 seconds if
the doors are not opened and closed.) ●
If the wireless remote control is used to
lock the doors when the electronic key is
near the vehicle, there is a possibility that
the door may not be unlocked by the
entry function. (Use the wireless remote
control to unlock the doors.) ●
Touching the door lock sensor while
wearing gloves may delay or prevent lock
operation. Remove the gloves and touch
the lock sensor again. ●
When the lock operation is performed
using the lock sensor, recognition signals
will be shown up to two consecutive
times. After this, no recognition signals
will be given. ●
If the door handle becomes wet while the
electronic key is within the effective
range, the door may lock and unlock
repeatedly. In that case, follow the follow-
ing correction procedures to wash the
vehicle:
• Place the electronic key in a location 6 ft.
(2 m) or more away from the vehicle.
(Take care to ensure that the key is not
stolen.)
• Set the electronic key to battery-saving
mode to disable the smart access system
with push-button start. ( → P.123)●
If the electronic key is inside the vehicle
and a door handle becomes wet during a
car wash, a message may be shown on
the multi-information display and a
buzzer will sound outside the vehicle. To
turn off the alarm, lock all the doors.
●
The lock sensor may not work properly if
it comes into contact with ice, snow, mud,
etc. Clean the lock sensor and attempt to
operate it again.
●
A sudden approach to the effective
range or door handle may prevent the
doors from being unlocked. In this case,
return the door handle to the original
position and check that the doors unlock
before pulling the door handle again.
●
If there is another electronic key in the
detection area, it may take slightly longer

1333-3. Adjusting the seats
LEXUS NX300h Owners Manu-
al_USA_OM78212U 3
Before driving ■
Seatback jam protection function
(power seat)
When folding down th e seatback, if a for-
eign object is perceived between the seat-
back and seat cushion, the seatback will
reverse operations and then stops opera-
tions.
The buzzer sounds intermittently during
reverse operations and sounds continu-
ously when operations are stopped.
WARNING■
When folding the rear seatbacks
down and after folded
Observe the following precautions.
Failure to do so may result in death or
serious injury. ●
Do not fold the seatbacks down while
driving.●
Stop the vehicle on level ground, set
the parking brake and shift the shift
lever to P.●
Do not allow anyone to sit on a folded
seatback or in the luggage compart-
ment while driving.●
Do not allow children to enter the lug-
gage compartment.■
After returning the rear seatback to
the upright position
Observe the following precautions.
Failure to do so may result in death or
serious injury. ●
Make sure that the seatback is
securely locked in position by lightly
pushing it back and forth.
●
Check that the seat belts are not
twisted or caught in the seatback.
■
Jam protection function (vehicles
with power seat)
Observe the following precautions.
Failure to do so may cause death or seri-
ous injury.
●
Never use any part of your body to
intentionally activate the jam protec-
tion function. ●
The jam protection function may not
work if something gets caught just
before the seatback is fully folded for-
ward. Be careful no t to get fingers
caught or anything else. ●
The jam protection function may not
work depending on the shape of the
object that is caught. Be careful not to
catch fingers or anything else.
NOTICE■
Stowing the seat belts
The seat belts and the buckles for the
rear center seat, as well as the armrest,
must be stowed before you fold down the
rear seatbacks. ( → P.30, 297)

1393-4. Adjusting the steering wheel and mirrors
LEXUS NX300h Owners Manu-
al_USA_OM78212U 3
Before driving 3-4.Adjusting the steering wheel and mirrors

Manual type
1 Hold the steering wheel and push
the lever down.
2 Adjust to the ideal position by mov-
ing the steering wheel horizontally
and vertically.After adjustment, pull the lever up to
secure the steering wheel.

Power type
Operating the switch moves the steer-
ing wheel in the following directions: 1 Up
2 Down
3 Toward the driver
4 Away from the driver ■
The steering wheel can be adjusted
when
The power switch is in ACCESSORY or
ON mode *
. *
: If the driver’s seat belt is fastened, the
steering wheel can be adjusted regard-
less of power switch mode. ■
Automatic adjustment of the steering
position (if equipped)
A desired steering posi tion can be entered
to memory and recalled automatically by
the driving position memory system.
( → P.134) ■
Power easy access system
The steering wheel and driver’s seat move
in accordance with power switch mode and
the driver’s seat belt condition. ( → P.134)
■
After adjusting the steering wheel
(manual type)
Make sure that the steering wheel is
securely locked.
The horn may not sound if the steering
wheel is not securely locked.Steering wheel
Adjustment procedure

140 3-4. Adjusting the steering wheel and mirrors
LEXUS NX300h Owners Manu-
al_USA_OM78212U To sound the horn, press on or close to
the mark. The height of the rear view mirror can
be adjusted to suit your driving pos-
ture.
Adjust the height of the rear view mir-
ror by moving it up and down.
Responding to the level of brightness
of the headlights of vehicles behind, the
reflected light is automatically
reduced. 
Type A
Changing automatic anti-glare func-
tion mode on/offWARNING■
Caution while driving
Do not adjust the steering wheel while
driving.
Doing so may cause the driver to mis-
handle the vehicle and cause an acci-
dent, resulting in death or serious injury. ■
After adjusting the steering wheel
(manual type)
Make sure that the steering wheel is
securely locked.
Otherwise, the steering wheel may move
suddenly, possibly causing an accident,
and resulting in deat h or serious injury.
Sounding the horn Inside rear view mirror The rear view mirror’s position can
be adjusted to enable sufficient
confirmation of the rear view.
Adjusting the heig ht of rear view
mirror
WARNING■
Caution while driving
Do not adjust the position of the mirror
while driving.
Doing so may lead to mishandling of the
vehicle and cause an accident, resulting
in death or serious injury.
Anti-glare function

142 3-4. Adjusting the steering wheel and mirrors
LEXUS NX300h Owners Manu-
al_USA_OM78212U 1 To select a mirror to adjust, press
the switch.
Left
Right 2 To adjust the mirror, press the
switch.
Up
Right
Down
Left ■
Mirror angle can be adjusted when
The power switch is in ACCESSORY or
ON mode. ■
Defogging the mirrors
The outside rear view mirrors can be
cleared using the mirror defoggers. Turn on
the rear window defogger to turn on the
outside rear view mirror defoggers.
( → P.269) ■
Auto anti-glare function
When the anti-glare inside rear view mirror
is set to automatic mode, the outside rear
view mirrors will activate in conjunction with
the anti-glare inside rear view mirror to
reduce reflec ted light. ( → P.140)
■
Automatic adjustment of the mirror
angle (vehicles with driving position
memory)
A desired mirror face angle can be entered
to memory and recalled automatically by
the driving position memory. ( → P.134)
■
Linked mirror function when reversing
(vehicles with driving position memory)
When the mirror select switch is in the “L”
or “R” position, the outside rear view mir-
rors will automatically angle downwards
when the vehicle is re versing in order to Outside rear view mirrors For safe driving, adjust the mirror
angles to secure visibility before
driving. WARNING■
When driving the vehicle
Observe the following precautions while
driving.
Failing to do so may result in loss of con-
trol of the vehicle and cause an accident,
resulting in death or serious injury. ●
Do not adjust the mirrors while driving.●
Do not drive with the mirrors folded.●
Both the driver and passenger side
mirrors must be extended and prop-
erly adjusted before driving.■
When the mirror defoggers are oper-
ating
Do not touch the rear view mirror sur-
faces, as they can become very hot and
burn you.
Adjustment procedure
A
B A
B
C
D

1534-1. Before driving
LEXUS NX300h Owners Manu-
al_USA_OM78212U 4
Driving WARNING●
Do not shift the shift lever to a driving
position while the vehicle is moving
backward.
Doing so can damage the transmission
and may result in a loss of vehicle con-
trol.●
Shifting the shift lever to N while the
vehicle is moving will disengage the
hybrid system.
Engine braking is not available when N
is selected.●
Be careful not to shift the shift lever
with the accelerator pedal depressed.
Shifting the shift lever to any position
other than P or N may lead to unex-
pected rapid acceleration of the vehi-
cle that may cause an accident and
result in death or serious injury.■
If you hear a squealing or scraping
noise (brake pad wear limit indica-
tors)
Have the brake pads checked and
replaced by your Lexus dealer as soon as
possible. Rotor damage may result if the
pads are not replaced when needed.
It is dangerous to drive the vehicle when
the wear limits of the brake pads and/or
those of the brake discs are exceeded.
■
When the vehicle is stopped●
Do not depress the accelerator pedal
unnecessarily.
If the shift lever is in any position other
than P or N, the vehicle may acceler-
ate suddenly and unexpectedly, caus-
ing an accident.
●
In order to prevent accidents due to
the vehicle rolling away, always keep
depressing the brake pedal while
stopped with the “READY” indicator is
illuminated, and apply the parking
brake as necessary. ●
If the vehicle is stopped on an incline,
in order to prevent accidents caused
by the vehicle rolling forward or back-
ward, always depress the brake pedal
and securely apply the parking brake
as needed. ●
Avoid revving or racing the engine.
Running the engine at high speed
while the vehicle is stopped may cause
the exhaust system to overheat, which
could result in a fire if combustible
material is nearby. ■
When the vehicle is parked ●
Do not leave glasses, cigarette lighters,
spray cans, or soft drink cans in the
vehicle when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter
or spray can, and ma y lead to a fire.
• The temperature inside the vehicle
may cause the plastic lenses and plas-
tic material of glasses to deform or
crack.
• Soft drink cans may fracture, causing
the contents to spray over the interior
of the vehicle, and may also cause a
short circuit in the vehicle’s electrical
components. ●
Do not leave cigarette lighters in the
vehicle. If a cigare tte lighter is in a
place such as the glove box or on the
floor, it may be lit accidentally when
luggage is loaded or the seat is
adjusted, causing a fire.
●
Do not attach adhesive discs to the
windshield or windows. Do not place
containers such as air fresheners on
the instrument panel or dashboard.
Adhesive discs or containers may act
as lenses, causing a fire in the vehicle.
●
Do not leave a door or window open if
the curved glass is coated with a met-
allized film such as a silver-colored
one. Reflected sunlight may cause the
glass to act as a lens, causing a fire.

154 4-1. Before driving
LEXUS NX300h Owners Manu-
al_USA_OM78212U WARNING●
Always apply the parking brake, shift
the shift lever to P, stop the hybrid sys-
tem and lock the vehicle.
Do not leave the vehicle unattended
while the “READY” indicator is illumi-
nated.
If the vehicle is parked with the shift
lever in P but the parking brake is not
set, the vehicle may start to move, pos-
sibly leading to an accident.●
Do not touch the exhaust pipes while
the “READY” indicator is illuminated
or immediately after turning the hybrid
system off.
Doing so may cause burns.■
When taking a nap in the vehicle
Always turn the hybrid system off. Other-
wise, if you accidentally move the shift
lever or depress the accelerator pedal,
this could cause an accident or fire due
to hybrid system overheating. Addition-
ally, if the vehicle is parked in a poorly
ventilated area, exha ust gases may col-
lect and enter the ve hicle, leading to
death or a serious health hazard. ■
When braking●
When the brakes are wet, drive more
cautiously.
Braking distance increases when the
brakes are wet, and this may cause one
side of the vehicle to brake differently
than the other side. Also, the parking
brake may not securely hold the vehi-
cle.
●
If the electronically controlled brake
system does not operate, do not follow
other vehicles closely and avoid hills or
sharp turns that require braking.
In this case, braking is still possible, but
the brake pedal should be depressed
more firmly than usual. Also, the brak-
ing distance will increase. Have your
brakes fixed immediately. ●
The brake system consists of 2 or more
individual hydraulic systems; if one of
the systems fails, the other(s) will still
operate. In this case, the brake pedal
should be depressed more firmly than
usual and the braking distance will
increase. Have your brakes fixed
immediately. ■
If the vehicle becomes stuck
Do not spin the wheels excessively when
any of the tires is up in the air, or the vehi-
cle is stuck in sand, mud, etc. This may
damage the driveline components or
propel the vehicle forward or backward,
causing an accident.
NOTICE■
When driving the vehicle ●
Do not depress the accelerator and
brake pedals at the same time during
driving, as this may restrain the hybrid
system output. ●
Do not use the accelerator pedal or
depress the accelerator and brake
pedals at the same time to hold the
vehicle on a hill. ■
Avoiding damage to vehicle parts ●
Do not turn the steering wheel fully in
either direction and hold it there for an
extended period of time.
Doing so may damage the power
steering motor.
●
When driving over bumps in the road,
drive as slowly as possible to avoid
damaging the wheels, underside of the
vehicle, etc.
■
If you get a flat tire while driving
A flat or damaged tire may cause the fol-
lowing situations. Hold the steering
wheel firmly and gradually depress the
brake pedal to slow down the vehicle.
●
It may be difficult to control your vehi-
cle.

156 4-1. Before driving
LEXUS NX300h Owners Manu-
al_USA_OM78212U Cargo capacity depends on the total
weight of the occupants. (Cargo capacity) = (Total load capac-
ity) — (Total weight of occupants)
Steps for Determining Correct Load
Limit ⎯
(1) Locate the statement “The com-
bined weight of occupants and cargo
should never exceed XXX kg or XXX
lbs.” on your vehicle’s placard.
(2) Determine the combined weight of
the driver and passengers that will be
riding in your vehicle.
(3) Subtract the combined weight of
the driver and passengers from XXX
kg or XXX lbs.
(4) The resulting figure equals the
available amount of cargo and luggage
load capacity.
For example, if the “XXX” amount
equals 1400 lbs. and there will be five
150 lb passengers in your vehicle, the
amount of available cargo and luggage
load capacity is 650 lbs. (1400 − 750
(5 × 150) = 650 lbs.)
(5) Determine the combined weight of
luggage and cargo being loaded on
the vehicle. That weight may not safely
exceed the available cargo and lug-
gage load capacity calculated in Step
4.
(6) If your vehicle will be towing a
trailer, load from your trailer will be
transferred to your vehicle. Consult
this manual to determine how this
reduces the available cargo and lug-
gage load capacity of your vehicle.
( → P.158)
Vehicles without towing package:
Lexus does not recommend towing a WARNING●
Secure all items in the occupant com-
partment.■
When using a roof luggage carrier
(vehicles with roof rails)
Observe the following precautions: ●
Place the cargo so that its weight is dis-
tributed evenly between the front and
rear axles.●
If loading long or wide cargo, never
exceed the vehicle overall length or
width. ( → P.400)●
Before driving, make sure the cargo is
securely fastened on the roof luggage
carrier.●
Loading cargo on the roof luggage
carrier will make the center of gravity
of the vehicle higher. Avoid high
speeds, sudden starts, sharp turns,
sudden braking or abrupt maneuvers,
otherwise it may result in loss of con-
trol or vehicle rollover due to failure to
operate this vehicle correctly and
result in death or serious injury.●
If driving for a long distance, on rough
roads, or at high sp eeds, stop the vehi-
cle now and then during the trip to
make sure the cargo remains in its
place.
●
Do not exceed 176.3 lb. (80 kg) cargo
weight on the roof luggage carrier.
NOTICE
■
When loading cargo (vehicles with
moon roof)
Do not set luggage on the moon roof.
Failure to observe so may lead to cause
damage.
Capacity and distribution

1594-1. Before driving
LEXUS NX300h Owners Manu-
al_USA_OM78212U 4
Driving
Contact your Lexus dealer for further
information about additional require-
ments such as a towing kit, etc. ■
Matching trailer ball height to trailer
coupler height
No matter which class of tow hitch applies,
for a more safe trailer hookup, the trailer
ball setup must be the proper height for the
coupler on the trailer. Coupler
Trailer ball ■
Before towing
Check that the following conditions are
met: ●
Ensure that your vehicle’s tires are prop-
erly inflated. ( → P.406)●
Trailer tires are inflated according to the
trailer manufacturer’s recommendation. ●
All trailer lights work as required by law. ●
All lights work each time you connect
them. ●
The trailer ball is set at the proper height
for the coupler on the trailer. ●
The trailer is level when it is hitched.
Do not drive if the trailer is not level, and
check for improper tongue weight, over-
loading, worn suspension, or other possi-
ble causes.
●
The trailer cargo is securely loaded.
●
The rear view mirrors conform to all
applicable federal, state/provincial or
local regulations. If they do not, install
rear view mirrors appropriate for towing
purposes.
■
Break-in schedule
If your vehicle is new or equipped with any
new power train components (such as an
engine, transmission, di fferential or wheel
bearing), Lexus recommends that you do
not tow a trailer until the vehicle has been Trailer towing (vehicles with
towing package) Your vehicle is de signed primarily
as a passenger-and-load-carrying
vehicle. Towing a trailer can have an
adverse impact on handling, per-
formance, braking, durability, and
fuel consumption. For your safety
and the safety of others, you must
not overload your vehicle or trailer.
You must also ensure that you are
using appropriate towing equip-
ment, that the towing equipment
has been installed correctly and
used properly, and that you employ
the requisite driving habits.
Vehicle-trailer stability and braking
performance are affected by trailer
stability, brake performance and
setting, trailer brakes, the hitch and
hitch systems (if equipped).
To tow a trailer safely, use extreme
care and drive the vehicle in accor-
dance with your trailer’s character-
istics and operating conditions.
Lexus warranties do not apply to
damage or malfunction caused by
towing a trailer for commercial pur-
poses. A
B