
444 What to do if... (Troubleshooting)
LEXUS NX300h Owners Manu-
al_USA_OM78212U 0-1.What to do if... (Troubleshooting)
What to do if... (Troubleshooting) If you lose your mechanical keys,
new genuine mechanical keys can
be made by your Lexus dealer.
( → P.386)
If you lose your electronic keys, the
risk of vehicle theft increases signifi-
cantly. Contact your Lexus dealer
immediately. ( → P.386)
Is the electronic key battery weak or
depleted? ( → P.347)
Is the power switch in ON mode?
When locking the doors, turn the
power switch off. ( → P.168)
Is the electronic key left inside the
vehicle?
When locking the doors, make sure
that you have the electronic key on
your person.
The function may not operate prop-
erly due to the condition of the radio
wave. ( → P.169) Is the child-protector lock set?
The rear door cannot be opened
from inside the vehicle when the
lock is set. Open the rear door from
outside and then unlock the child-
protector lock. ( → P.109)
Did you press the power switch
while firmly depressing the brake
pedal? ( → P.168)
Is the shift lever in P? ( → P.168)
Is the electronic key anywhere
detectable inside the vehicle?
( → P.122)
Is the steering wheel unlocked?
( → P.169)
Is the electronic key battery weak or
depleted?
In this case, the hybrid system can
be started in a temporary way.
( → P.388)
Is the 12-volt battery discharged?
( → P.390)
Is the power switch in ON mode?If you have a problem, check the
following before contacting your
Lexus dealer.
The doors cannot be locked,
unlocked, opened or closed You lose your keys
The doors cannot be locked or
unlocked The rear door cannot be opened
If you think something is wrong The hybrid system does not start
The shift lever ca nnot be shifted
from P even if you depress the
brake pedal

445What to do if... (Troubleshooting)
LEXUS NX300h Owners Manu-
al_USA_OM78212U 445What to do if... (Troubleshooting)
If you cannot release the shift lever
by depressing the brake pedal with
the power switch in ON mode
( → P.174)
It is locked automatically to prevent
theft of the vehicle. ( → P.169)
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.145)
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.170)
The seat belt reminder light is flash-
ing
Are the driver and the front passen-
ger wearing the seat belts?
( → P.369)
The parking brake indicator is on
Is the parking brake released? ( → P.177)
Depending on the situation, other
types of warning buzzer may also
sound. ( → P.365, 374)
Did anyone inside the vehicle open
a door during setting the alarm?
The sensor detects it and the alarm
sounds. ( → P.71)
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.374)
When a warning light turns on or a
warning message is displayed, refer
to P.365, 374.
Stop the vehicle in a safe place and
replace the flat tire with the spare 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
When a problem has occurred If you have a flat tire

451What to do if... (Troubleshooting)
LEXUS NX300h Owners Manu-
al_USA_OM78212U Alphabetical Index
451Refueling ..........................................................196
When the fuel filler door cannot be
opened ........................................................ 387
Fuses ................................................................. 349 G
Garage door opener ................................. 298
Gas station information ............................ 460
Gauges ................................................................79
Glove box ....................................................... 282
Glove box light ............................................. 282
Grocery bag hooks .................................... 285 H
Head restraints ............................................... 137
Head-up display.............................................. 90
Headlights ....................................................... 183
Automatic headlight leveling ................ 184
Automatic High Beam ............................. 186
Light switch .................................................... 183
Replacing light bulbs................................ 353
Heated steering wheel ...............................276
Heaters
Automatic air conditioning system ...268
Heated steering wheel............................ 275
Outside rear view mirrors .................... 269
Seat heaters .................................................. 275
High mounted stoplight
Replacing light bulb..................................353
Hill-start assist control ............................... 250
Hood ................................................................. 325
Warning message........................... 107, 374
Hooks
Cargo hooks................................................ 284
Retaining hooks (floor mat)......................24
Horn ................................................................... 140
Hybrid battery (traction battery)
Location............................................................. 64
Specification ................................................. 402
Hybrid battery air vent ................................. 66
Hybrid system .................................................... 61 Emergency shut off system...................... 67
Energy monitor/consumption screen 94
EV drive mode............................................... 171
High voltage components ....................... 64
Hybrid System Indicator ........................... 82
Hybrid system precautions...................... 64
Hybrid vehicle driving tips ....................255
If the hybrid system will not start ....... 385
Overheating .................................................394
Power switch................................................. 168
Regenerative braking ................................. 62
Starting the hybrid system ...................... 168
Vehicle proximity noti fication system. 63
Hybrid System Indicator.............................. 82
Hybrid transmission...................................... 173
I
I/M test ............................................................ 322
Identification
Engine............................................................... 401
Vehicle ........................................................... 400
Ignition switch (Power switch) ................ 168
Illuminated entry system ........................... 278
Immobilizer system........................................ 69
Indicators ............................................................74
Initialization
Engine oil maintenance data................329
Items to initialize ......................................... 429
Tire pressure warning system ...............341
Inside rear view mirror ............................... 140
Instrument panel light control ................... 84
Interior lights.................................................. 278
Intuitive parking assist
Function .......................................................... 227
Warning message ..................................... 229

456 Alphabetical Index
LEXUS NX300h Owners Manu-
al_USA_OM78212U Steering wheel
Adjustment......................................................139
Heated steering wheel............................ 275
Power easy access system .....................134
Stop lights
Replacing light bulbs................................ 353
Storage feature ..............................................281
Storage precautions.....................................281
Stuck
If the vehicle becomes stuck................ 397
Sun visors ........................................................288
Sunglass holder ............................................ 283
Switch
ASC (Active Sound Control) dial ....... 181
Automatic High Beam switch .............. 186
Brake hold switch....................................... 180
BSM (Blind Spot Monitor) main switch
........................................................................... 241
Cruise control switch ................................ 217
Door lock switch......................................... 108
Driving mode select switch .................. 249
Driving position memory switches .....134
Emergency flashers switch .................. 358
EV drive mode switch ................................171
Fog light switch ............................................ 189
Garage door opener switches ..........298
Heated steering wheel............................ 275
HUD (Head-up display) switches ....... 90
Ignition switch............................................... 168
Intuitive parking assist switch................227
LDA switch .....................................................210
Light switches ............................................... 183
Meter control switches ..............................85
Moon roof switches ...................................146
Outside rear view mirror switches ..... 142
Paddle shift switches .................................. 175
Parking brake switch ................................. 177
PCS switch ...................................................205
Power back door opener and closer
switch............................................................... 113
Power switch ................................................ 168
Power window switch ............................... 144 Rear window and outside rear view mir-
ror defoggers switch ............................269
Rear window wiper and washer switch
........................................................................... 194
Seat heater switches................................. 275
“SOS” button............................................... 306
Tire pressure warning reset switch.....341
Vehicle-to-vehicle distance button .... 217
VSC off switch ............................................. 251
Window lock switch.................................. 145
Windshield wipers and washer switch
........................................................................... 189 T
Tachometer........................................................79
Tail lights
Light switch .................................................... 183
Replacing light bulbs ................................353
Theft deterrent system
Alarm..................................................................... 71
Immobilizer system ......................................69
Tire inflation pressure
Maintenance data ..................................... 406
Warning light ...............................................370
Tire information ............................................. 410
Glossary ...........................................................414
Size ......................................................................412
Tire identification number......................... 411
Uniform Tire Quality Grading ..............412
Tire pressure warning system
Function ......................................................... 338
Initializing..........................................................341
Installing tire pres sure warning valves
and transmitters...................................... 340
Registering ID codes ...............................343
Warning light ...............................................370
Tires................................................................... 336
Chains ............................................................ 258
Checking .......................................................336
Glossary ...........................................................414
If you have a flat tire .................................. 377
Inflation pressure ........................... 343, 406