ECU LEXUS NX300h 2018 Owner's Guide

631-2. Hybrid system
LEXUS NX300h Owners Manu-
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For safety and security ■
Sounds and vibrations specific to a
hybrid vehicle
There may be no engine sound or vibration
even though the vehicle is able to move with
the “READY” indicator is illuminated. For
safety, make sure to sh ift the shift lever to P
and apply the parking brake when parked.
The following sounds or vibrations may
occur when the hybrid system is operating
and are not a malfunction: ●
Motor sounds may be heard from the
engine compartment.●
Sounds may be heard from the hybrid
battery (traction battery) behind the rear
seats when the hybrid system starts or
stops.●
Relay operating sounds such as a snap or
soft clank will be emitted from the hybrid
battery (traction batter y), behind the rear
seats, when the hybrid system is started
or stopped.●
Sounds from the hybrid system may be
heard when the back door is open.●
Sounds may be heard from the transmis-
sion when the gasoline engine starts or
stops, when driving at low speeds, or
during idling.●
Engine sounds may be heard when
accelerating sharply.●
Sounds may be heard due to regenera-
tive braking when the brake pedal is
depressed or as the accelerator pedal is
released.●
Vibration may be felt when the gasoline
engine starts or stops.●
Cooling fan sounds may be heard from
the air intake vents under the rear seats.
■
Maintenance, repair, recycling, and dis-
posal
Contact your Lexus dealer regarding main-
tenance, repair, recycling and disposal. Do
not dispose of the vehicle yourself.
■
Customization
Settings (e.g. on/off operation of the EV
indicator) can be changed.
(Customizable features: → P.419) When driving with the gasoline engine
stopped, a sound, which changes in
accordance with the driving speed, will
be played in order to warn people
nearby of the vehicle’s approach. The
sound will stop when the vehicle speed
exceeds approximately 15 mph (25
km/h). ■
Vehicle proximity notification system
In the following cases, the vehicle proximity
notification system may be difficult for sur-
rounding people to hear. ●
In very noisy areas ●
In the wind or the rain
Also, as the vehicle proximity notification
system is installed on the front of the vehicle,
it may be more difficult to hear from the rear
of the vehicle compared to the front.Vehicle proximity notification
system

651-2. Hybrid system
LEXUS NX300h Owners Manu-
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For safety and security ( → P.369) go off. If th ere is only a small
amount of fuel, the hybrid system may not
be able to start. (The standard amount of
fuel is about 2.7 gal. [10.1 L, 2.2 Imp.gal.],
when the vehicle is on a level surface. This
value may vary when the vehicle is on a
slope. Add extra fuel when the vehicle is
inclined.) ■
Electromagnetic waves●
High voltage parts and cables on hybrid
vehicles incorporate electromagnetic
shielding, and ther efore emit approxi-
mately the same amount of electromag-
netic waves as conventional gasoline
powered vehicles or home electronic
appliances.●
Your vehicle may cause sound interfer-
ence in some third party-produced radio
parts.■
Hybrid battery (traction battery)
The hybrid battery (traction battery) has a
limited service life. The lifespan of the
hybrid battery (traction battery) can
change in accordance with driving style and
driving conditions.
WARNING■
High voltage precautions
This vehicle has high voltage DC and AC
systems as well as a 12-volt system. DC
and AC high voltage is very dangerous
and can cause severe burns and electric
shock that may result in death or serious
injury. ●
Never touch, disassemble, remove or
replace the high voltage parts, cables
or their connectors.
●
The hybrid system will become hot
after starting as the system uses high
voltage. Be careful of both the high
voltage and the high temperature, and
always obey the warning labels
attached to the vehicle. ●
Never try to open the service plug
access hole located underneath the
rear seats. The service plug is used
only when the vehicle is serviced and is
subject to high voltage.
■
Road accident cautions
Observe the following precautions to
reduce the risk of de ath or serious injury:●
Pull your vehicle off the road, shift the
shift lever to P, apply the parking brake,
and turn the hybrid system off. ●
Do not touch the high voltage parts,
cables and connectors. ●
If electric wires ar e exposed inside or
outside your vehicle, an electric shock
may occur. Never touch exposed elec-
tric wires. ●
If a fluid leak occurs, do not touch the
fluid as it may be st rong alkaline elec-
trolyte from the hybrid battery (trac-
tion battery). If it comes into contact
with your skin or eyes, wash it off
immediately with a large amount of
water or, if possible, boric acid solu-
tion. Seek immediate medical atten-
tion.
●
If a fire occurs in the hybrid vehicle,
leave the vehicle as soon as possible.
Never use a fire extinguisher that is not
meant for electric fires. Using even a
small amount of water may be danger-
ous.

671-2. Hybrid system
LEXUS NX300h Owners Manu-
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For safety and security
Air intake vents
Air discharge vents When a certain level of impact is
detected by the impact sensor, the
emergency shut off system blocks the
high voltage current and stops the fuel
pump to minimize the risk of electrocu-
tion and fuel leakage. If the emergency
shut off system activates, your vehicle
will not restart. To restart the hybrid
system, contact your Lexus dealer.
A message is automatically displayed
when a malfunction occurs in the
hybrid system or an improper opera-
tion is attempted.
If a warning message is shown on the
multi-information display, read the
message and follow the instructions.NOTICE■
Hybrid battery (traction battery) air
intake and discharge vents●
Do not place objects that will block the
air intake vents. The hybrid battery
(traction battery) may have a reduc-
tion in hybrid battery (traction battery)
output as well as be damaged.
●
Clean the air intake and discharge
vents regularly to prevent the hybrid
battery (traction battery) from over-
heating.
●
Do not get water or foreign materials
in either the air intake and discharge
vents as this may cause a short circuit
and damage the hybrid battery (trac-
tion battery).
●
Do not carry large amounts of water
such as water cooler bottles in the
vehicle. If water spills onto the hybrid
battery (traction battery), the battery
may be damaged.
Have the vehicle inspected by your
Lexus dealer. A
B ●
A filter is installed to the air intake vent.
When the filter re mains noticeably
dirty even after cleaning the air intake
vent, filter cleaning or replacement is
recommended. When cleaning or
replacing the filter, contact your Lexus
dealer.
When “Maintenance Required for
Traction battery cooling parts at your
dealer” is shown on the multi-informa-
tion display, the filter may be clogged.
Have the filter cleaned or replaced at
your Lexus dealer.
Emergency shut off system
Hybrid warning message

691-3. Theft deterrent system
LEXUS NX300h Owners Manu-
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For safety and security 1-3.Theft deterrent system
The indicator light flashes after the
power switch has been turned off to
indicate that the system is operating.
The indicator light stops flashing after
the power switch has been turned to ACCESSORY or ON mode to indi-
cate that the system has been can-
celed.
■
System maintenance
The vehicle has a maintenance-free type
engine immobilizer system. ■
Conditions that may cause the system to
malfunction ●
If the grip portion of the key is in contact
with a metallic object ●
If the key is in close proximity to or touch-
ing a key registered to the security sys-
tem (key with a built-in transponder chip)
of another vehicle■
Certification for the immobilizer system 
For vehicles sold in the U.S.A.Immobilizer system The vehicle’s keys have built-in tran-
sponder chips that prevent the
hybrid system from starting if a key
has not been previously registered
in the vehicle’s on-board computer.
Never leave the keys inside the
vehicle when you leave the vehicle.
This system is designed to help pre-
vent vehicle theft but does not guar-
antee absolute security against all
vehicle thefts.
Operating the system

711-3. Theft deterrent system
LEXUS NX300h Owners Manu-
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For safety and security
■
Items to check before locking the
vehicle
To prevent unexpected triggering of
the alarm and vehicle theft, make sure
of the following:
 Nobody is in the vehicle.
 The windows and moon roof (if
equipped) are closed before the
alarm is set.
 No valuables or other personal
items are left in the vehicle. ■
Setting
Close the doors and hood, and lock all
the doors. The system will be set auto-
matically after 30 seconds. The indicator light changes from being on
to flashing when the system is set. ■
Canceling or stopping
Do one of the following to deactivate
or stop the alarms:
 Unlock the doors.
 Turn the power switch to ACCES-
SORY or ON mode, or start the
hybrid system. (The alarm will be
deactivated or stopped after a few
seconds.) ■
System maintenance
The vehicle has a maintenance-free type
alarm system. ■
Triggering of the alarm
The alarm may be triggered in the following
situations:
(Stopping the alarm deactivates the alarm
system.) ●
A person inside the vehicle opens a door
or hood, or unlocks the vehicle using an
inside lock button.
●
The 12-volt battery is recharged or
replaced when the vehicle is locked.
( → P.392)Alarm The alarm uses light and sound to
give an alert when an intrusion is
detected.
The alarm is triggered in the follow-
ing situations when the alarm is set:
 A locked door is unlocked or
opened in any way other than
using the entry function, wireless
remote control or mechanical
key. (The doors will lock again
automatically.)
 The hood is opened.
Setting/canceling/stopping the
alarm system

772-1. Instrument cluster
LEXUS NX300h Owners Manu-
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Vehicle status information and indicators *1
: These lights turn on when the power
switch is turned to the ON mode to
indicate that a system check is being
performed. They will turn off after the
hybrid system is on, or after a few sec-
onds. There may be a malfunction in a
system if the lights do not turn on, or
turn off. Have the vehicle inspected by
your Lexus dealer. *2
: This light illuminates on the multi-infor-
mation display. *3
: The light flashes to indicate that the sys-
tem is operating. *4
: The light comes on when the system is
turned off. *5
: When the outside temperature is
approximately 37°F (3°C) or lower, the
indicator will flash for approximately 10
seconds, then stay on. *6
: In order to confirm operation, the BSM
outside rear view mirror indicators illu-
minate in the following situations:
When the power switch is turned to
ON mode while the BSM main switch is
set to ON.
When the BSM main switch is set to
ON while the power switch is in ON
mode.
If the system is func tioning correctly, the
BSM outside rear view mirror indica-
tors will turn off after a few seconds.
If the BSM outside rear view mirror indi-
cators do not illuminate or do not turn
off, there may be a malfunction in the
system.
If this occurs, have the vehicle inspected (White)
LDA indicator *2
( → P.210)(Green)
LDA indicator *2
( → P.210)(Orange)
LDA indicator *2, 3
( → P.210)(if equipped)
Intuitive parking assist indica-
tor ( → P.227)(if equipped)
PKSB OFF indicator *1, 4

( → P.232)
Slip indicator light *1, 3
( → P.251)
VSC off indicator *1, 4
( → P.251)
PCS warning light *1, 4
( → P.205)
(U.S.A.)
Parking brake indicator
( → P.178)
(Canada)
Parking brake indicator
( → P.178)
Brake hold standby indicator *1

( → P.180)
Brake hold operated indica-
tor *1
( → P.180)
Low outside temperature
indicator *2, 5
( → P.79)
(if equipped)
BSM outside rear view mirror
indicators *6, 7
( → P.241)
Security indicator *8
( → P.69,
71) (U.S.A.)
“AIR BAG ON/OFF” indi-
cator *8
( → P.41)(Canada)
“AIR BAG ON/OFF” indi-
cator *7
( → P.41)

106 3-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manu-
al_USA_OM78212U 3-2.Opening, closing and locking the doors
■
Using the smart access system with
push-button start
Carry the electronic key to enable this
function.
1 Grip the driver’s door handle to
unlock the door. Grip any passen-
ger door handle to unlock all the
doors. *
Make sure to touch the sensor on the back
of the handle.
The doors cannot be unlocked for 3 sec-
onds after the doors are locked. *
: The door unlock settings can be
changed.
2 Touch the lock sensor (the indenta-
tion on the surface of the door han-
dle) to lock all the doors.Check that the door is securely locked. ■
Using the wireless remote control
1 Locks all the doors Check that the door is securely locked.
2 Unlocks all the doors Pressing the button unlocks the driver’s
door. Pressing the button again within 3
seconds unlocks the other doors.
Press and hold to open the windows and
moon roof *1, 2
*1
: If equipped *2
: This setting must be customized at your
Lexus dealer.
■
Switching the door unlock function
It is possible to set which doors the entry
function unlocks using the wireless remote
control.
1 Turn the power switch off.
2 When the indicator light on the key sur-
face is not on, press and hold ,
or for approximately 5
seconds while pre ssing and holding
.
The setting changes each time an operation
is performed, as shown below. (When
changing the setting continuously, release
the buttons, wait for at least 5 seconds, and
repeat step 2 .)Side doors The vehicle can be locked and
unlocked using the entry function,
wireless remote control or door
lock switch.
Unlocking and locking the doors
from the outside

1073-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manu-
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Before driving
For vehicles with alarm: To prevent unin-
tended triggering of the alarm, unlock the
doors using the wirele ss remote control and
open and close a door once after the set-
tings have been changed. (If a door is not
opened within 60 seconds after is
pressed, the doors will be locked again and
the alarm will automatically be set.)
In a case that the alarm is triggered, imme-
diately stop the alarm. ( → P.71)■
Locking the doors from the outside with-
out a key
1 Move the inside lock button to the lock
position.
2 Close the door.
The door cannot be locked if the power
switch is in ACCESSORY or ON mode, or
the electronic key is le ft inside the vehicle.
The key may not be detected correctly and
the door may be locked.
■
Impact detection door lock release sys-
tem
In the event that the vehicle is subject to a
strong impact, all the doors are unlocked.
Depending on the force of the impact or the
type of accident, however, the system may not operate. ■
Operation signals
Doors:
A buzzer sounds and the emergency flash-
ers flash to indicate that the doors have
been locked/unlocked. (Locked: Once;
Unlocked: Twice)
Windows:
A buzzer sounds to indicate that all win-
dows are opening. ■
Security feature
If a door is not opened within approximately
60 seconds after the vehicle is unlocked,
the security feature automatically locks the
vehicle again. ■
Open door warning buzzer
If the vehicle speed reaches 3 mph (5 km/
h), the master warning light flashes and a
buzzer sounds to indicate that door(s) or
the hood in not fully closed.
The open door(s) or hood is displayed on
the multi-information display. ■
Welcome light illumination control
The side marker, parking, tail and license
plate lights automatically turn on at night
when the doors are unlocked using the
entry function or wireless remote control if
the light switch is in the “AUTO” position. ■
When the door cannot be locked by the
lock sensor on the surface of the door
handle
When the door cannot be locked even if the
lock sensor on the surface of the door han-
dle is touched by a finger, touch the lock
sensor with the palm.
When gloves are being worn, remove the
gloves.Multi-information
display/Beep Unlocking function
Exterior: Beeps 3
times
Interior: Pings
once Holding the driver’s
door handle unlocks
only the driver’s door.
Holding any of the
passenger door han-
dles unlocks all the
doors.
Exterior: Beeps
twice
Interior: Pings
once Holding a door han-
dle unlocks all the
doors.

110 3-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manu-
al_USA_OM78212U Back door The back door can be locked/
unlocked and opened/closed by the
following procedures. WARNING■
Caution while driving●
Keep the back door closed while driv-
ing.
If the back door is left open, it may hit
nearby objects while driving or lug-
gage may be unexpectedly thrown out,
causing an accident.
In addition, exhaust gases may enter
the vehicle, causing death or a serious
health hazard. Make sure to close the
back door before driving.●
Before driving the vehicle, make sure
that the back door is fully closed. If the
back door is not fully closed, it may
open unexpectedly while driving,
causing an accident.●
Never let anyone sit in the luggage
compartment. In the event of sudden
braking or a collision, they are suscep-
tible to death or serious injury.
■
When children are in the vehicle
Observe the following precautions.
Failure to do so may result in death or
serious injury. ●
Do not allow children to play in the lug-
gage compartment.
If a child is accidentally locked in the
luggage compartmen t, they could
have heat exhaustion or other injuries.
●
Do not allow a child to open or close
the back door.
Doing so may cause the back door to
move unexpectedly, or cause the
child’s hands, head, or neck to be
caught by the closing back door. ■
Operating the back door
Observe the following precautions.
Failure to do so may cause parts of the
body to be caught, resulting in death or
serious injury. ●
Remove any heavy loads, such as snow
and ice, from the back door before
opening it. Failure to do so may cause
the back door to suddenly shut again
after it is opened. ●
When opening or closing the back
door, thoroughly ch eck to make sure
the surrounding area is safe. ●
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. ●
Use caution when opening or closing
the back door in windy weather as it
may move abruptly in strong wind. ●
Vehicles without power back door:
The back door may suddenly shut if it is
not opened fully. It is more difficult to
open or close the back door on an
incline than on a level surface, so
beware of the back door unexpectedly
opening or closing by itself. Make sure
that the back door is fully open and
secure before using the luggage com-
partment.
●
Vehicles with power back door: The
back door may suddenly shut if it is not
opened fully, while on a steep incline.
Make sure that the back door is
secured before using the luggage
compartment.

1113-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manu-
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Before driving ■
Smart access system with push-
button start
Carry the electronic key to enable this
function.
1 Locks all the doors Check that the door is securely locked.
2 Unlocks all the doors The doors cannot be unlocked for 3 sec-
onds after the doors are locked. ■
Wireless remote control
→ P.104
■
Door lock switch
→ P.108
■
Open
Raise the back door while pressing up
the back door opener switch.WARNING●
When closing the back door, take
extra care to prevent your fingers, etc.,
from being caught.
●
When closing the back door, make
sure to press it lightly on its outer sur-
face. If the back door handle is used to
fully close the back door, it may result
in hands or arms being caught.●
Do not pull on the back door damper
stay (vehicles without power back
door) ( → P.112) or back door spindle
(vehicles with power back door)
( → P.118) to close the back door, and
do not hang on the back door damper
stay (vehicles without power back
door) or back door spindle (vehicles
with power back door).
Doing so may cause hands to be
caught or the back door damper stay
(vehicles without a power back door)
or back door spin dle (vehicles with
power back door) to break, causing an
accident.
●
If a bicycle carrier or similar heavy
object is attached to the back door, it
may suddenly shut again after being
opened, causing someone’s hands,
head or neck to be caught and injured.
When installing an accessory part to
the back door, using a genuine Lexus
part is recommended. Unlocking and locking the back
door from the outside
Unlocking and locking the back
door from the inside
Opening/closing the back door
(vehicles without power back
door)