2018 LEXUS NX300h heating

252 4-5. Using the driving support systems
LEXUS NX300h Owners Manu-
al_USA_OM78212U 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 TRAC will turn on when vehicle speed
increases ●
If only the TRAC system is turned off, the
TRAC will turn on when vehicle speed
increases
If both the TRAC and VSC systems are
turned off, automatic re-enabling will not
occur when vehicle speed increases. ■
Operating conditions of hill-start assist
control
When the following four conditions are met,
the hill-start assist control will operate:●
The shift lever is in a position other than P
or N (when starting off forward/back-
ward on an up ward incline).●
The vehicle is stopped. ●
The accelerator pedal is not depressed. ●
The parking brake is not engaged. ■
Automatic system cancelation of hill-
start assist control
The hill-start assist control will turn off in any
of the following situations: ●
The shift lever is shifted to P or N. ●
The accelerator pedal is depressed. ●
The parking brake is engaged. ●
2 seconds at maximum elapsed after the
brake pedal is released
WARNING
■
The ABS does not operate effectively
when ●
The limits of tire gripping performance
have been exceeded (such as exces-
sively worn tires on a snow covered
road).
●
The vehicle hydroplanes while driving
at high speed on wet or slick road.

2554-6. Driving tips
LEXUS NX300h Owners Manu-
al_USA_OM78212U 4
Driving 4-6.Driving tips
When using Eco mode, the torque cor-
responding to the accelerator pedal
depression amount can be generated
more smoothly than it is in normal con-
ditions. In addition, the operation of the
air conditioning system (heating/cool-
ing) will be minimized, improving the
fuel economy. ( → P.249)
The Eco-friendly driving is possible by
keeping the indicator needle of Hybrid
System Indicator within Eco area.
( → P.82)
Shift the shift lever to D when stopped
at a traffic light, or driving in heavy traf-
fic, etc. Shift the shift lever to P when
parking. When using the N, there is no
positive effect on fuel consumption. In
the N, the gasoline engine operates
but electricity cannot be generated.
Also, when using the air conditioning
system, etc., the hybrid battery (trac-
tion battery) power is consumed.  Drive your vehicle smoothly. Avoid
abrupt acceleration and decelera-
tion. Gradual acceleration and
deceleration will make more effec-
tive use of the electric motor (trac-
tion motor) without having to use
gasoline engine power.
 Avoid repeated acceleration.
Repeated acceleration consumes
hybrid battery (traction battery)
power, resulting in poor fuel con-
sumption. Battery power can be
restored by driving with the acceler-
ator pedal slightly released.
Make sure to operate the brakes gently
and in a timely manner. A greater
amount of electrical energy can be
regenerated when slowing down.
Repeated acceleration and decelera-
tion, as well as long waits at traffic
lights, will lead to bad fuel economy.
Check traffic reports before leaving
and avoid delays as much as possible.
When driving in a traffic jam, gently
release the brake pedal to allow the
vehicle to move forward slightly while
avoiding overuse of the accelerator
pedal. Doing so can help control
excessive gasoline consumption.Hybrid vehicle driving tips For economical and ecological
driving, pay attention to the follow-
ing points:
Using Eco mode
Use of Hybrid System Indicator
Shift Changing the shift lever
operation Accelerator pedal/brake pedal
operation
When braking
Delays

270 5-2. Using the air conditio ning system and defogger
LEXUS NX300h Owners Manu-
al_USA_OM78212U mode automatically.
This may also reduce fuel consumption.●
Recirculated air mode is selected as a
default mode when the power switch is
turned to ON mode.●
It is possible to switch to outside air mode
at any time by pressing the outside/recir-
culated air mode switch.■
Fogging up of the windows●
The windows will easily fog up when the
humidity in the vehicle is high. Pressing
“A/C” button or selecting “A/C” will
dehumidify the air from the outlets and
defog the windshield effectively.●
If you turn “A/C” off, the windows may
fog up more easily.●
The windows may fog up if the recircu-
lated air mode is used.■
Outside/recirculated air mode●
When driving on dusty roads such as tun-
nels or in heavy traffic, set the outside/
recirculated air mode switch to the recir-
culated air mode. This is effective in pre-
venting outside air from entering the
vehicle interior. During cooling opera-
tion, setting the recirculated air mode will
also cool the vehicle interior effectively.●
Outside/recirculated air mode may auto-
matically switch de pending on the tem-
perature setting or the inside
temperature.■
Registering air condit ioning settings to
electronic keys (vehicles with driving
position memory)●
Unlocking the vehicle using an electronic
key and turning the power switch to ON
mode will recall that key’s registered air
conditioning settings.
●
When the power switch is turned off, the
current air conditioning settings will auto-
matically be registered to the electronic
key that was used to unlock the vehicle.
●
The system may not operate correctly if
more than one electr onic key is in the
vicinity or if the smart access system with
push-button start is used to unlock a pas-
senger door.
●
The doors that can recall the air condi- tioning setting when unlocked using the
smart access system with push-button
start can be changed. *
For details, con-
tact your Lexus dealer. *
: The doors that can recall the driving posi-
tion memory are changed at the same
time. ■
Operation of the air conditioning sys-
tem in Eco mode ●
In the Eco mode, the air conditioning sys-
tem is controlled as follows to prioritize
fuel efficiency
• Engine speed and compressor operation
controlled to restrict heating/cooling
capacity
• Fan speed restricted when automatic
mode is selected ●
To improve air conditioning performance,
perform the following operations
• Adjust the fan speed
• Adjust the temperature setting
• Turn off Eco mode ●
Even when the drive mode is set to Eco
mode, the air conditioning eco mode can
be turned off by pressing the ■
When the outside temperature is low
The dehumidification function may not
operate even when “A/C” is pressed or “A/
C” is selected. ■
Ventilation and air conditioning odors ●
To let fresh air in, set the air conditioning
system to the outside air mode. ●
During use, various odors from inside and
outside the vehicle may enter into and
accumulate in the air conditioning sys-
tem. This may then cause odor to be
emitted from the vents.
●
To reduce potential odors from occur-
ring:
• It is recommended that the air condition-
ing system be set to outside air mode
prior to turning the vehicle off.
• The start timing of the blower may be
delayed for a short pe riod of time imme-
diately after the air conditioning system is
started in automatic mode.

2775-2. Using the air conditio ning system and defogger
LEXUS NX300h Owners Manu-
al_USA_OM78212U 5
Interior features ■
Operation condition
The seat heaters can be used when the
power switch is in ON mode.
Each time the switch is pressed, the
operation condition changes as fol-
lows.
Hi (3 segments lit) → Mid (2 segments
lit) → Lo (1 segment lit) → OffThe indicator (green) and level indicator
(green) light up during operation. ■
Operation condition
The power switch is in ON mode.
WARNING■
To prevent causes of overheating and
minor burn injuries
Observe the following precautions when
using a seat heater ●
Do not cover the seat with a blanket or
cushion when using the seat heater.●
Do not use seat heater more than nec-
essary.
Seat ventilators (front)
A

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.

394 7-2. Steps to take in an emergency
LEXUS NX300h Owners Manu-
al_USA_OM78212U 
“Engine Coolant Temp High” is
shown on the multi-information dis-
play
1 Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the hybrid system.
2 If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the hybrid system has cooled
down sufficiently, inspect the hoses and radiator core (radiator) for any
leaks.
Radiator
Cooling fans If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4 The coolant level is satisfactory if it
is between the “FULL” and “LOW”
lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
5 Add coolant if necessary. Water can be used in an emergency if If your vehicle overheats The following may indicate that
your vehicle is overheating.
 The needle of the engine coolant
temperature gauge ( → P.79)
enters the red zone, or a loss of
hybrid system power is experi-
enced. (For example, the vehicle
speed does not increase.)
 “Engine Coolant Temp High” or
“Hybrid System Overheated” is
shown on the multi-information
display.
 Steam comes out from under the
hood.
Correction procedures A
B
A
B
C

424 8-2. Customization
LEXUS NX300h Owners Manu-
al_USA_OM78212U ■
Automatic air conditioning system ( → P.268)
■
Eco mode ( → P.249)
■
Power windows ( → P.144)
■
Moon roof *1
( → P.146)
*1
: If equipped *2
: This function cannot be cust omized unless power window op erations, using the wireless
remote control or mechanical key, is enabled. Function Default setting Customized set-
ting
Switching between outside
air and recirculated air mode
linked to “AUTO” switch
operation On Off O — O —
A/C Auto switch operation On Off O — O —
Function Default setting Customized set-
ting
Heating/coolin g operation
minimized in Eco mode On Off — — O —
Function Default setting Customized set-
ting
Mechanical key linked opera-
tion Off On — — O —
Wireless remote control
linked open operation Off On — — O —
Function Default setting Customized set-
ting
Mechanical key linked opera-
tion *2
Off On — — O —
Wireless remote control
linked open or Tilt up opera-
tions *2
Off On — — O — A B C D
A B C D
A B C D
A B C D

448 Alphabetical Index
LEXUS NX300h Owners Manu-
al_USA_OM78212U Brake
Brake Hold .................................................... 180
Fluid ..................................................................405
Parking brake ................................................ 177
Regenerative braking ................................. 62
Warning light ...............................................366
Brake assist .................................................... 250
Brake Hold ...................................................... 180
Break-in tips...................................................... 151
Brightness control
Instrument panel light control ................ 84
BSM (Blind Spot Monitor)......................... 241
Blind Spot Monitor function................. 243
Rear Cross Traffic Alert function....... 246
BSM (Blind Spot Monitor) main switch241
C
Card key ...........................................................102
Care
Aluminum wheels ........................................314
Exterior ............................................................. 314
Interior ............................................................... 314
Seat belts.......................................................... 317
Cargo capacity...................................155, 400
Cargo hooks ................................................. 284
Cargo net hooks .......................................... 284
Chains .............................................................. 258
Child restraint system....................................47
Booster seats installation .......................... 53
Convertible seats installation.................. 52
Front passenger occupa nt classification
system ............................................................... 41
Infant seats definition................................... 49
Infant seats installation .................................. 51
Installing CRS with LATCH anchors . 55
Installing CRS with seat belts.................... 51
Installing CRS with top tether strap..... 57
LATCH anchors ........................................... 55
Child safety ....................................................... 46
12-volt battery precautions .......334, 393
Airbag precautions.......................................37
Back door precautions.............................. 110 Child restraint system ................................. 47
How your child should wear the seat belt
............................................................................. 28
Installing child restraints............................. 47
Moon roof precautions............................ 148
Power window lock switch .................... 145
Power window precautions .................. 145
Rear door child-protectors ................... 109
Removed key battery precautions... 348
Seat belt extender precautions.............. 28
Seat belt precautions .................................. 46
Seat heater precautions.......................... 275
Child-protectors........................................... 109
Cleaning .................................................. 314, 317
Aluminum wheels ........................................314
Exterior..............................................................314
Interior ...............................................................317
Seat belts ..........................................................317
Clock ................................................................288
Compass ......................................................... 303
Condenser .......................................................331
Console box .................................................. 282
Consumption screen .................................... 94
Coolant
Capacity ........................................................ 403
Checking ...................................................... 330
Preparing and checking before winter
.......................................................................... 257
Warning light .............................................. 366
Cooling system............................................. 330
Hybrid system overheating ..................394
Cruise control
Dynamic radar cruise control with full-
speed range ............................................... 217
Cup holders ................................................... 282
Curtain shield airbags .................................. 32
Customizable features ................................419
D
Daytime running light system .................. 184
Deck board .................................................... 285
Deck under tray ........................................... 285