2018 LEXUS NX300h engine overheat

4 TABLE OF CONTENTS
LEXUS NX300h Owners Manu-
al_USA_OM78212U 5-5. Using the other interior features
Other interior features .............. 288
Garage door opener.................. 298
Compass.......................................... 303
Lexus Enform Safety Connect 306
Lexus Enform Remote ................. 311
Lexus Enform Service Connect
............................................................ 312
6-1. Maintenance and care
Cleaning and protecting the vehi-
cle exterior .................................... 314
Cleaning and protecting the vehi-
cle interior ..................................... 317
6-2. Maintenance
Maintenance requirements ...... 319
General maintenance ................ 320
Emission inspection and mainte-
nance (I/M) programs ............ 322
6-3. Do-it-yourself maintenance
Do-it-yourself service precautions
........................................................... 324
Hood.................................................. 325
Positioning a floor jack............... 326
Engine compartment.................. 327
12-volt battery................................ 333
Tires ................................................... 336
Tire inflation pressure ................. 343
Wheels.............................................. 345
Air conditioning filter.................. 346
Electronic key battery ................ 347
Checking and replacing fuses 349
Headlight aim.................................. 351
Light bulbs ....................................... 353 7-1. Essential information
Emergency flashers .................... 358
If your vehicle has to be stopped in
an emergency ............................ 358
7-2. Steps to take in an emergency
If your vehicle needs to be towed
.......................................................... 360
If you think something is wrong
.......................................................... 363
If a warning light turns on or a warn-
ing buzzer sounds..................... 365
If a warning messa ge is displayed
.......................................................... 374
If you have a flat tire .................... 377
If the hybrid syst em will not start
.......................................................... 385
If you lose your keys.................... 386
If the fuel filler door cannot be
opened .......................................... 387
If the electronic key does not oper-
ate properly ................................. 387
If the 12-volt battery is discharged
.......................................................... 390
If your vehicle overheats ........... 394
If the vehicle becomes stuck ... 397
8-1. Specifications
Maintenance data (fuel, oil level,
etc.) ................................................. 40
0
Fuel information ............................ 408
Tire information ............................. 4106
Maintenance and care 7
When trouble arises
8
Vehicle specifications

13Pictorial index
LEXUS NX300h Owners Manu-
al_USA_OM78212U Precautions against winter season ............................................................................ P.257
To prevent freezing (windshield wiper de-icer) .................................................. P.273
Precautions against car wash ....................................................................................... P.315
Fuel filler door .......................................................................................................... P.196
Refueling method .............................................................................................................. P .196
Fuel type/fuel tank capacity ...... .................................................................................... P.401
Tires.......................................................................................................................... ..P.336
Tire size/inflation pressure ...........................................................................................P.406
Winter tires/tire chain .................................................................................................... P.25 7
Checking/rotation/tire pressure warning system.............................................. P.336
Coping with flat tires........................................................................................................ P .377
Hood ......................................................................................................................... P. 325
Opening ........................................................................................................................ ....... P.325
Engine compartment cover .........................................................................................P.328
Engine oil ..................................................................................................................... ......... P.402
Coping with overheat ..................................................................................................... P.394
Warning messages .......................................................................................................... P.374
Headlights .................................................................................................................P.18 3
Parking lights/daytime running lights...............................................................P.183
Fog lights....................................................................................................................P .189
Turn signal lights ...................................................................................................... P.176
Tail lights .................................................................................................................... P.183
License plate lights .................................................................................................P.183
Back-up light
Shifting the shift lever to R ...............................................................................................P.1 73
Side marker lights ...................................................................................................P.183 *
:If equipped Light bulbs of the exterior lights for driving
(Replacing method: P.353, Watts: P.407) E
F
G
H
I
J
K
L
M
N
O

832-1. Instrument cluster
LEXUS NX300h Owners Manu-
al_USA_OM78212U 2
Vehicle status information and indicators ■
Customization
The meter display can be customized on
the multi-information display.
(Customizable features: → P.419)
WARNING■
The information display at low tem-
peratures
Allow the interior of the vehicle to warm
up before using the liquid crystal infor-
mation display. At extremely low tem-
peratures, the in formation display
monitor may respond slowly, and display
changes may be delayed.
For example, there is a lag between the
driver's shifting and the new gear num-
ber appearing on the display. This lag
could cause the driver to downshift
again, causing rapid and excessive
engine braking and possibly an accident
resulting in personal death or injury.
NOTICE■
To prevent damage to the engine and
its components●
When the tachometer is displayed, do
not let the indicator needle of the
tachometer enter the red zone, which
indicates the maximum engine speed.
●
The engine may be overheating if the
engine coolant temperature gauge is
in the red zone (H); or “Engine Cool-
ant Temp High” or “Hybrid System
Overheated” is shown on the multi-
information display. In this case, imme-
diately stop the vehicle in a safe place,
and check the engine or hybrid system
after it has cooled completely.
( → P.394)

152 4-1. Before driving
LEXUS NX300h Owners Manu-
al_USA_OM78212U WARNING●
During normal driving, do not turn off
the hybrid system. Turning the hybrid
system off while driving will not cause
loss of steering or braking control,
however, power assist to the steering
will be lost. This will make it more diffi-
cult to steer smoothly, so you should
pull over and stop the vehicle as soon
as it is safe to do so.
In the event of an emergency, such as if
it becomes impossible to stop the vehi-
cle in the normal way: → P.358●
Use engine braking (downshift) to
maintain a safe speed when driving
down a steep hill.
Using the brakes continuously may
cause the brakes to overheat and lose
effectiveness. ( → P.176)●
Do not adjust the positions of the
steering wheel, the seat, or the inside
or outside rear view mirrors while driv-
ing.
Doing so may result in a loss of vehicle
control.●
Always check that all passengers’
arms, heads or other parts of their
body are not outside the vehicle.●
Do not drive the vehicle off-road.
This is not an AWD vehicle designed
for off-road driving. Proceed with all
due caution if it becomes unavoidable
to drive off-road.
●
Do not drive across a river or through
other bodies of water.
This may cause electric/electronic
components to shor t circuit, damage
the hybrid system or cause other seri-
ous damage to the vehicle. ●
Do not drive in excess of the speed
limit. Even if the legal speed limit per-
mits it, do not drive over 85 mph (140
km/h) unless your vehicle has high-
speed capability tires.
Driving over 85 mph (140 km/h) may
result in tire failur e, loss of control and
possible injury. Be sure to consult a tire
dealer to determine whether the tires
on your vehicle are high-speed capa-
bility tires or not befo re driving at such
speeds. ■
When driving on slippery road sur-
faces ●
Sudden braking, acceleration and
steering may cause tire slippage and
reduce your ability to control the vehi-
cle. ●
Sudden acceleration, engine braking
due to shifting, or changes in engine
speed could cause the vehicle to skid. ●
After driving through a puddle, lightly
depress the brake pedal to make sure
that the brakes are functioning prop-
erly. Wet brake pads may prevent the
brakes from functioning properly. If the
brakes on only one side are wet and
not functioning properly, steering con-
trol may be affected.
■
When shifting the shift lever ●
Do not let the vehicle roll backward
while the shift lever is in a driving posi-
tion, or roll forward while the shift lever
is in R.
Doing so may result in an accident or
damage to the vehicle.
●
Do not shift the shif t lever to P while
the vehicle is moving.
Doing so can damage the transmission
and may result in a loss of vehicle con-
trol.
●
Do not shift the shift lever to R while
the vehicle is moving forward.
Doing so can damage the transmission
and may result in a loss of vehicle con-
trol.

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.

166 4-1. Before driving
LEXUS NX300h Owners Manu-
al_USA_OM78212U do not put the transmission in D.
( → P.176)
 Instability happens more frequently
when descending steep or long
downhill grades. Before descend-
ing, slow down and downshift. Do
not make sudden downshifts while
descending steep or long downhill
grades.
 Avoid holding the brake pedal down
too long or applying the brakes too
frequently. This could cause the
brakes to overheat and result in
reduced braking efficiency.
 Due to the added load of the trailer,
your vehicle’s engine may overheat
on hot days (at temperatures over
85°F [30°C]) when driving up a
long or steep grade. If the engine
coolant temperature gauge indi-
cates overheating, immediately turn
off the air conditioning (if in use),
pull your vehicle off the road and
stop in a safe spot. ( → P.394)
 Always place wheel blocks under
both the vehicle’s and the trailer’s
wheels when parking. Put the trans-
mission in P and apply the parking
brake. Avoid parking on a slope, but
if unavoidable, do so only after per-
forming the following:
1 Apply the brakes and keep them
applied.
2 Have someone place wheel blocks
under both the vehicle’s and trailer’s
wheels. 3 When the wheel blocks are in
place, release the brakes slowly
until the blocks absorb the load.
4 Shift into P and apply the parking
brake.
5 Turn off the hybrid system.
 When restarting after parking on a
slope:
1 With the transmission in P, start the
hybrid system. Be sure to keep the
brake pedal depressed.
2 Shift into a forward gear. If revers-
ing, shift into R.
3 If the parking brake is in manual
mode, release the parking brake.
( → P.179)
4 Release the brake pedal, and slowly
pull or back away from the wheel
blocks. Stop and apply the brakes.
5 Have someone retrieve the blocks.

366 7-2. Steps to take in an emergency
LEXUS NX300h Owners Manu-
al_USA_OM78212U ■
High coolant temperature warning light (warning buzzer) *
*
: This light illuminates on the multi-information display. ■
Brake system warning light
■
Malfunction indicator lamp
■
SRS warning light Warning light Details/Actions
Indicates that the engine is overheating
→ Immediately stop the vehicle in a safe place. Continu-
ing to drive the vehicle may be dangerous.
Handling method ( → P.394)
Warning light Details/Actions
(Yellow)
Indicates a malfunction in:
 The regenerative braking system;
 The electronically controlled brake system; or
 The electric parking brake
→ Have the vehicle inspected by your Lexus dealer
immediately.
Warning light Details/Actions
(U.S.A.)
(Canada) Indicates a malfunction in:
 The hybrid system;
 The electronic engine control system;
 The electronic throttle control system; or
 The emission control system
→ Have the vehicle inspected by your Lexus dealer
immediately.
Warning light Details/Actions
Indicates a malfunction in:
 The SRS airbag system;
 The front passenger occupant classification system; or
 The seat belt pretensioner system
→ Have the vehicle inspected by your Lexus dealer
immediately.

376 7-2. Steps to take in an emergency
LEXUS NX300h Owners Manu-
al_USA_OM78212U charged” ( → P.390).*
: Displays for about 6 seconds ■
If “Traction Battery Needs to be Pro-
tected Refrain From the Use of N Posi-
tion” is shown
This message may be displayed when the
shift lever is in N.
As the hybrid battery (traction battery) can-
not be charged when the shift lever is in N,
when the vehicle is to be stopped for a long
period of time, shift the shift lever to P. ■
If “Traction battery needs to be pro-
tected. Shift into P to restart.” is shown
Message is displayed when the remaining
charge for the hybrid battery (traction bat-
tery) is low, because vehicle has been
shifted N for a long period of time.
When operating the vehicle, restart the
hybrid system. ■
If “Shift to P Before Exiting Vehicle” is
shown
Message is displayed when the driver’s
door is opened with out turning the power
switch to OFF with the shift lever in any
position other than P.
Shift the shift lever to P. ■
If “Shift Is in N Release Accelerator
Before Shifting” is shown
Message is displayed when the accelerator
pedal has been depressed and the shift
lever is in N. Releas e the accelerator pedal
and shift the shift lever to D, S or R. ■
If “Depress Brake When Vehicle Is
Stopped Hybrid Syst em May Overheat”
is shown
Message is displayed when the accelerator
pedal is depressed to maintain the vehicle
position when stopped on a upward slope,
etc.
If this continues, th e hybrid system may
overheat.
Release the accelerator pedal and depress
the brake pedal.
■
If “Front Camera Unavailable” or “Front
Camera Unavailable Remove Debris
On Windshield” is shown
The following systems may be suspended
until the problem shown in the message is resolved. ( → P.209, 367)●
PCS (Pre-Collision System) ●
LDA (Lane Departure Alert with steering
control) ●
Dynamic radar cruise control with full-
speed range ●
Adaptive High-beam System ●
Automatic High Beam ■
If “Oil Maintenance Required Soon” is
shown
Indicates that the engine oil is scheduled to
be changed. (The indicator will not work
properly unless the oi l maintenance data
has been reset.)
Check the engine oil, and change if neces-
sary. After changing th e engine oil, the oil
change system should be reset. ( → P.329)■
If “Oil Maintenance Required” is shown
Indicates that the engine oil should be
changed. (After the engine oil is changed
and the oil maintenance data has been
reset.)
Check and change the en gine oil, and oil fil-
ter by your Lexus dealer. After changing the
engine oil, the oil change system should be
reset. ( → P.329)■
If “See Owner’s Manual” is shown ●
If the following messages are shown, fol-
lowing the instruct ions, accordingly.
• “Engine Coolant Temp High” ( → P.394)
• “Aux Battery Low” ( → P.375)●
If the following messages are shown,
there may be a malfunction.
Immediately have the vehicle inspected
by your Lexus dealer.
• “Hybrid System Malfunction”
•“Check Engine”
• “Hybrid Battery System Malfunction”
• “Accelerator System Malfunction”
• “Braking Power Low”
• “Smart Access System Malfunction”
●
If the following messages are shown,
there may be a malfunction.
Immediately stop the vehicle in a safe
place and contact your Lexus dealer.
Continuing to drive the vehicle may be
dangerous.
• “Oil Pressure Low”