2021 LEXUS NX300h warning light

3987-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
The warning lights and warning buzzers op erate as follows depending on the con-
tent of the message. If a message indicates the need for inspection by a dealer, have
the vehicle inspected by your Lexus dealer immediately.
If a warning message is dis-
played
The multi-information display
shows warnings of system malfunc-
tions, incorrectly performed opera-
tions, and messages that indicate a
need for maintenance. When a
message is shown, perform the cor-
rection procedure appropriate to
the message.
Master warning light
The master warning light also comes on
or flashes in order to indicate that a mes-
sage is currently being displayed on the
multi-information display.
Multi-information display
Follow the instructions of the message
on the multi-information display.
If any of the warning messages are
shown again after the following actions
have been performed, contact your
Lexus dealer.
A
B
Messages and warnings

3997-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
7
When trouble arises
*: A buzzer sounds the first time a message is shown on the multi-information display.
■System warning lights
The master warning light does not come on
or flash in the following cases. Instead, a
separate system warning light will come on
along with a message shown on the multi-
information display.
●Malfunction of the ABS
The ABS warning light comes on.
(  P.390)
●Malfunction of the charging system
The charging system warning light comes
on. ( P.388)
■If “Hybrid System Overheated Output
power reduced” is shown
This message may be displayed when driv-
ing under severe operating conditions. (For
example, when driving up a long steep hill.)
Handling method: P.418
■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,
shift the shift lever to P when the vehicle is
stopped.
■If “Traction Battery Needs to be Pro-
tected. Shift into P to
Restart.” is shown
This message is displayed when the hybrid
battery (traction battery) charge has
become extremely low because the shift
lever has been left in N for a certain amount
of time.
When operating the vehicle, shift to P and
restart the hybrid system.
■If “Shift to P Before Exiting Vehicle” is
shown
Message is displayed when the driver’s
door is opened without 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
System
warning light
Warning buzzer*Warning
Comes onSounds
Indicates an important situation, such as
when a system related to driving is malfunc-
tioning or that danger may result if the cor-
rection procedure is not performed

Comes on or
flashes
Sounds
Indicates an important situation, such as
when the systems shown on the multi-infor-
mation display may be malfunctioning
FlashesSoundsIndicates a situation, such as when damage
to the vehicle or danger may result
Comes onDoes not sound
Indicates a condition, such as malfunction of
electrical components, their condition, or
indicates the need for maintenance
FlashesDoes not sound
Indicates a situation, such as when an opera-
tion has been performed incorrectly, or indi-
cates how to perform an operation correctly

4087-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
warning system. Also, if you replace the
compact spare tire after the tire pressure
warning light comes on, the light remains
on.
■When the compact spare tire is
equipped
The vehicle becomes lower when driving
with the compact spar e tire compared to
when driving with standard tires.
■If you have a flat fron t tire on a road cov-
ered with snow or ice
Install the compact spare tire on one of the
rear wheels of the vehicle. Perform the fol-
lowing steps and fit tire chains to the front
tires:
1 Replace a rear tire with the compact
spare tire.
2 Replace the flat front tire with the tire
removed from the rear of the vehicle.
3 Fit tire chains to the front tires.
WARNING
■When using the compact spare tire
●Remember that the spare tire provided
is specifically desi gned for use with
your vehicle. Do not use your spare
tire on another vehicle.
●Do not use more than one spare tire
simultaneously.
●Replace the spare tire with a standard
tire as soon as possible.
●Avoid sudden acceleration, abrupt
steering, sudden braking and shifting
operations that cause sudden engine
braking.
■When the compact spare tire is
attached
The vehicle speed may not be correctly
detected, and the following systems may
not operate correctly:
• ABS & Brake assist
•VSC
•TRAC
• Dynamic radar cruise control with full- speed range
• PCS (Pre-Collision System)
•EPS
• AVS (Adaptive Variable Suspension System) (if equipped)
• LTA (Lane Tracing Assist) (if equipped)
• LDA (Lane Departure Alert with steering control) (if equipped)
• Panoramic view monitor (if equipped)
• Lexus parking assist monitor (if equipped)
• Intuitive parking assist (if equipped)
• Navigation system (if equipped)
• BSM (Blind spot monitor) (if equipped)
• Automatic high Beam (if equipped)
Also, not only can the following system
not be utilized fully, bu t it may even nega-
tively affect the drive-train components:
•E-Four
■Speed limit when using the compact
spare tire
Do not drive at speeds in excess of 50
mph (80 km/h) when a compact spare
tire is installed on the vehicle.
The compact spare tire is not designed
for driving at high speeds. Failure to
observe this precaution may lead to an
accident causing death or serious injury.

4177-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
7
When trouble arises
■When replacing the 12-volt battery
●Use a 12-volt battery that the case size is
same as the previous one (LN2), 20 hour
rate capacity (20HR) is equivalent
(60Ah) or greater, and performance rat-
ing (CCA) is equivalent (460A) or
greater.
• If the sizes differ, the 12-volt battery can-
not be properly secured.
• If the 20 hour rate capacity is low, even if the time period where the vehicle is not
used is a short time, the 12-volt battery
may discharge and hybrid system may
not be able to start.
●After exchanging, firmly attach the fol-
lowing items to the exhaust hole of the 12-
volt battery.
• Use the exhaust hose that was attached to the 12-volt battery before
exchanging and confirm that it is firmly
connected to the hole section of the vehi-
cle.
• Use the exhaust hole plug included
with the 12-volt battery exchanged or the
one installed on the battery prior to the
exchange. (Depending on the 12-volt
battery to be exchanged, the exhaust
hole may be plugged.)
For details, consult your Lexus dealer.
C
A
B
WARNING
■Avoiding 12-volt battery fires or
explosions
Observe the following precautions to
prevent accidentally igniting the flamma-
ble gas that may be emitted from the 12-
volt battery:
●Make sure each jumper cable is con-
nected to the correct terminal and that
it is not unintentionally in contact with
any other than the intended terminal.
●Do not allow the other end of the
jumper cable connected to the “+” ter-
minal to come into contact with any
other parts or meta l surfaces in the
area, such as brackets or unpainted
metal.
●Do not allow the + and - clamps of the
jumper cables to come into contact
with each other.
●Do not smoke, use matches, cigarette
lighters or allow open flame near the
12-volt battery.
■12-volt Battery precautions
The 12-volt battery contains poisonous
and corrosive acidic electrolyte, while
related parts contain lead and lead com-
pounds. Observe the following precau-
tions when handling the 12-volt battery:
●When working with the 12-volt battery,
always wear safety glasses and take
care not to allow any battery fluids
(acid) to come into contact with skin,
clothing or the vehicle body.
●Do not lean over the 12-volt battery.
●In the event that battery fluid comes
into contact with the skin or eyes,
immediately wash the affected area
with water and seek medical attention.
Place a wet sponge or cloth over the
affected area until medical attention
can be received.
●Always wash your ha nds after handling
the 12-volt battery support, terminals,
and other battery-related parts.

LEXUS NX300h Owners Manual_USA_M78578_en
469What to do if... (Troubleshooting)
Is the power switch in ON mode?
If you cannot release the shift lever
by depressing the brake pedal with
the power switch in ON mode
( P.181)
 It is locked automatically to prevent
theft of the vehicle. ( P.175)
 Is the window lock switch pressed?
The power window except for the
one at the driver’s seat cannot be
operated if the window lock switch
is pressed. ( P.149)
 The auto power off function will be
operated if the vehicle is left in
ACCESSORY or ON mode (the
hybrid system is not operating) for a
period of time. ( P.177)
 The seat belt reminder light is flash-
ing
Are the driver and the passengers wearing the seat belts? (
P.393)
 The parking brake indicator is on
Is the parking brake released?
( P.184)
Depending on the situation, other
types of warning buzzer may also
sound. ( P.388, 398)
 Did anyone inside the vehicle open
a door during setting the alarm?
The sensor detects it and the alarm
sounds. ( P.77)
To stop the alarm, turn the power
switch to ON mode or start the hybrid
system.
 Is the message displayed on the
multi-information display?
Check the message on the multi-
information display. ( P.398)
 When a warning light turns on or a
warning message is displayed, refer
to P.388, 398.
The shift lever cannot be shifted
from P even if you depress the
brake pedal
The steering wheel cannot be
turned after the hybrid system is
stopped
The windows do not open or
close by operating the power
window switches
The power switch is turned off
automatically
A warning buzzer sounds during
driving
An alarm is activated and the
horn sounds
A warning buzzer sounds when
leaving the vehicle
A warning light turns on or a
warning message is displayed

LEXUS NX300h Owners Manual_USA_M78578_en
471Alphabetical Index
Alphabetical Index
A
A/C .....................................................................291
Air conditioning filter ...............................368
Automatic air conditioning system ..... 291
Micro dust and pollen filter................... 297
S-FLOW mode.......................................... 296
ABS (Anti-lock Brake System)...............272 Function ...........................................................272
Warning light ...............................................390
Active Sound Control (ASC) ................. 188
Adaptive Variable Suspension system (AVS) ............................................................ 273
AFS (Adaptive Front-lighting System) .192
Air conditioning filter ................................. 368
Air conditioning system ..............................291 Air conditioning filter ...............................368
Automatic air conditioning system ..... 291
Micro dust and pollen filter................... 297
S-FLOW mode.......................................... 296
Airbags ............................................................... 32 Airbag operating conditions................... 34
Airbag precautions for your child .........37
Airbag warning light ................................390
Correct driving posture ............................ 25
Curtain shield airbag operating condi-tions .................................................................. 34
Curtain shield airbag precautions ........37
Front passenger occupant classification system ............................................................... 41
General airbag precautions ....................37
Locations of airbags.....................................32
Modification and disposal of airbags . 40
Seat cushion airbag ......................................32
Side airbag operating conditions ......... 34
Side airbag precautions .............................37
Side and curtain shield airbags operating conditions...................................................... 34
Side and curtain shield airbags precau- tions ...................................................................37
SRS airbag instruct ions for Canadian
owners .........................................................458 SRS airbags...................................................... 32
SRS warning light...................................... 390
Alarm .................................................................... 77 Alarm....................................................................77
Warning buzzer ........................................ 388
Anchor brackets ..................................... 55, 57
Antenna (Smart access system with push- button start) ..................................................126
Anti-lock brake system (ABS) ................272 Function .......................................................... 272
Warning light .............................................. 390
Approach warning...................................... 243
Armrest..............................................................321
ASC (Active Sound Control) ................. 188
Assist grips .......................................................321
Automatic air conditioning system Air conditioning filter............................... 368
Automatic air conditioning system .....291
Micro dust and pollen filter ................... 297
S-FLOW mode ..........................................296
Automatic headlight leveling system ..... 191
Automatic High Beam ................................193
Automatic light control system................. 191
Auxiliary box.................................................. 307
B
Back door .......................................................... 114 Wireless remote control ........................... 117
Back-up lights Replacing light bulb ..................................375
Battery (12-volt battery) If the 12-volt battery is discharged ......414
Preparing and checking before winter.......................................................................... 279
Replacing ........................................................ 416
Warning light .............................................. 388
Battery (traction batter y) ............................ 70
Blind Spot Monitor (BSM)....................... 262 Blind Spot Monitor function .................265
Rear Cross Traffic Alert function ....... 267
Bottle holders ................................................ 306
Brake

472Alphabetical Index
LEXUS NX300h Owners Manual_USA_M78578_en
Brake Hold .....................................................187
Fluid .................................................................. 429
Parking brake ............................................... 184
Regenerative braking ................................. 68
Warning light ...............................................389
Brake assist .....................................................272
Brake Hold .......................................................187
Break-in tips..................................................... 157
Brightness control Instrument panel light control ................88
BSM (Blind Spot Monitor)....................... 262 Blind Spot Monitor function................. 265
Rear Cross Traffic Alert function....... 267
BSM (Blind Spot Monitor) main switch .......................................................................... 262
C
Card key .......................................................... 106
Care Aluminum wheels ...................................... 332
Exterior ........................................................... 335
Interior ............................................................. 335
Seat belts........................................................ 335
Cargo capacity........................... 161, 164, 424
Cargo hooks .................................................308
Cargo net hooks ..........................................308
Chains ..............................................................280
Child restraint system....................................47 Booster seats installation .......................... 53
Convertible seats installation.................. 52
Front passenger occupant classification system ............................................................... 41
Infant seats definition................................... 48
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 ........................................................47 12-volt battery precautions .........355, 417
Airbag precautions.......................................37
Back door precautions...............................114 Child restraint system ................................. 47
How your child should wear the seat belt
............................................................................. 27
Installing child restraints............................. 47
Moon roof precautions............................ 152
Power window lock switch .................... 149
Power window precautions .................. 149
Rear door child-protectors ..................... 113
Removed key battery precautions....370
Seat belt extender precautions.............. 27
Seat belt precautions ..........................26, 47
Seat heater precautions..........................299
Child-protectors............................................. 113
Cleaning ...............................................332, 335 Aluminum wheels ...................................... 332
Exterior............................................................ 332
Interior .............................................................335
Seat belts ........................................................335
Clock ..................................................................312
Compass ......................................................... 328
Condenser ..................................................... 352
Console box .................................................. 306
Consumption screen .................................... 99
Coolant Capacity ......................................................... 427
Checking ........................................................ 351
Preparing and checking before winter.......................................................................... 279
Warning light .............................................. 389
Cooling system...............................................351 Hybrid system overheating ................... 418
Cornering lights .............................................192
Coussins gonflables Modification et élimin ation en fin de vie
des coussins gonflables ......................464
Précautions avec les coussins gonflables latéraux ....................................................... 460
Précautions avec les coussins gonflables latéraux et rideau ................................... 460
Précautions avec les coussins gonflables pour votre enfant ................................... 460
Précautions avec les coussins gonflables

LEXUS NX300h Owners Manual_USA_M78578_en
Alphabetical Index473
rideau ...........................................................460
Précautions générales avec les coussins gonflables ...................................................460
Cruise control Dynamic radar cruise control with full-speed range .............................................. 237
Cup holders ................................................... 306
Curtain shield airbags .................................. 32
Customizable features .............................. 443
D
Daytime running light system .................... 191
Deck board .................................................... 309
Deck under tray ........................................... 309
Defogger Outside rear view mirrors .................... 292
Rear window ................................................ 292
Windshield .................................................... 292
Differential ...................................................... 429
Dimension ...................................................... 424
Dinghy towing................................................. 173
Display BSM (Blind Spot Monitor) ................... 262
Drive information .......................................... 90
Dynamic radar cruise control with full-speed range .............................................. 237
Energy monitor.............................................. 99
Head-up display ........................................... 95
Intuitive parking assist.............................. 248
LDA (Lane Departure Alert with steering control) .........................................................227
LTA (Lane Tracing Assist)......................218
Multi-information display .......................... 89
Warning messages ..................................398
Do-it-yourself maintenance .................... 344
Door lock Back door......................................................... 115
Side doors ........................................................ 110
Smart access system with push-button start .................................................................. 126
Wireless remote control..........................107 Doors
Automatic door lock ing and unlocking
system.............................................................. 113
Back door ......................................................... 114
Door glasses ................................................. 148
Door lock .......................................................... 110
Outside rear view mirrors...................... 146
Rear door child-protectors ..................... 113
Side doors ........................................................ 110
Drive information ........................................... 90
Drive-start control ............................. 157, 180
Driver’s seat belt remi nder light ............ 393
Driver’s seat position memory ................ 138
Driving Break-in tips ...................................................157
Correct posture............................................. 25
Driving mode select switch .................. 270
Hybrid vehicle driving tips .................... 277
Procedures .................................................... 156
Winter drive tips ......................................... 279
Driving position memory........................... 138 Memory recall function............................ 139
Dynamic radar cruise control with full- speed rangeFunction .......................................................... 237
E
E-Four .............................................................. 273
ECB (Electronically Controlled Brake Sys-
tem) .................................................................272
Eco mode........................................................ 270
EDR (Event data recorder) ........................... 8
Electric motor Location ............................................................. 67
Specification ................................................. 426
Electric Power Steering (EPS) Function .......................................................... 272
Warning light .............................................. 390
Electronic key Battery-saving function............................. 127
If the electronic key does not operate properly .........................................................412