2021 LEXUS NX300h alarm

1273-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manual_USA_M78578_en
3
Before driving
■Effective range (areas within which the
electronic key is detected)
When locking or unlocking the doors
The system can be operated when the
electronic key is within about 2.3 ft. (0.7
m) of an outside door handle. (Only the
doors detecting the key can be oper-
ated.)
When starting the hybrid system or
changing power switch modes
The system can be operated when the elec-
tronic key is inside the vehicle.
■If an alarm sounds or a warning message
is displayed
A combination of exterior and interior
alarms as well as warning messages shown
on the multi-information display are used to
prevent theft of the vehicle and accidents
resulting from erroneous operation. Take
appropriate measures in response to any
warning message on the multi-information
display. ( P.398)
When only an alarm sounds, circumstances
and correction procedures are as follows.
●When an exterior alarm sounds once for
5 seconds
●When an Interior alarm pings repeatedly
■When “Smart Access System Malfunc-
tion See Owner’s Manual” will be dis-
played on the multi-information display
The system may be ma lfunctioning. Have
the vehicle inspected by your Lexus dealer
immediately.
■Battery-saving function
The battery-saving function will be acti-
vated in order to prevent the electronic key
battery and the 12-volt battery from being
discharged while the vehicle is not in opera-
tion for a long time.
●In the following situations, the smart
access system with pu sh-button start may
take some time to unlock the doors.
• The electronic key has been left in an area of approximately 6 ft. (2 m) of the
outside of the vehicle for 10 minutes or
longer.
• The smart access system with push-but- ton start has not been used for 5 days or
longer.
●If the smart access system with push-but-
ton start has not been used for 14 days or
longer, the doors cann ot be unlocked at
any doors except the dr iver’s door. In this
case, take hold of the driver’s door han-
dle, or use the wireless remote control or
the mechanical key, to unlock the doors.
■Turning an electronic key to battery-
saving mode
When battery-saving mode is set, battery
depletion is minimized by stopping the elec-
SituationCorrection proce- dure
An attempt was
made to lock the
vehicle while a door was open.Close all of the
doors and lock the doors again.
A
B
SituationCorrection proce- dure
The power switch was turned to
ACCESSORY mode while the
driver’s door was
open (The driver’s door was opened when the power switch was in
ACCESSORY mode).
Turn the power
switch off and close the driver’s door.

1293-2. Opening, closing and locking the doors
LEXUS NX300h Owners Manual_USA_M78578_en
3
Before driving
of water splashes on the door handle,
such as in the rain or in a car wash when
the electronic key is within the effective
range. (The door will automatically be
locked after approximately 60 seconds if
the doors are not opened and closed.)
●If the wireless remote control is used to
lock the doors when the electronic key is
near the vehicle, there is a possibility that
the door may not be unlocked by the
entry function. (Use the wireless remote
control to unlock the doors.)
●Touching the door lock sensor while
wearing gloves may delay or prevent lock
operation. Remove the gloves and touch
the lock sensor again.
●When the lock operation is performed
using the lock sensor, recognition signals
will be shown up to two consecutive
times. After this, no recognition signals
will be given.
●If the door handle becomes wet while the
electronic key is within the effective
range, the door may lock and unlock
repeatedly. In that ca se, follow the follow-
ing correction procedures to wash the
vehicle:
• Place the electronic key in a location 6 ft. (2 m) or more away from the vehicle.
(Take care to ensure that the key is not
stolen.)
• Set the electronic key to battery-saving
mode to disable the smart access system
with push-button start. ( P.127)
●If the electronic key is inside the vehicle
and a door handle becomes wet during a
car wash, a message may be shown on
the multi-information display and a
buzzer will sound outside the vehicle. To
turn off the alarm, lock all the doors.
●The lock sensor may not work properly if
it comes into contact with ice, snow, mud,
etc. Clean the lock sensor and attempt to
operate it again.
●A sudden approach to the effective
range or door handle may prevent the
doors from being unlocked. In this case,
return the door handle to the original
position and check that the doors unlock
before pulling the door handle again.
●If there is another electronic key in the detection area, it may
take slightly longer
to unlock the doors after the door handle
is gripped.
■When the vehicle is not driven for
extended periods
●To prevent theft of the vehicle, do not
leave the electronic key within 6 ft. (2 m)
of the vehicle.
●The smart access system with push-but-
ton start can be deactivated in advance.
■To operate the system properly
Make sure to carry the electronic key when
operating the system. Do not get the elec-
tronic key too close to the vehicle when
operating the system from the outside of the
vehicle.
Depending on the position and holding
condition of the electronic key, the key may
not be detected correctly and the system
may not operate properly. (The alarm may
go off accidentally, or the door lock preven-
tion may not operate.)
■If the smart access system with push-
button start does not operate properly
●Locking and unlockin g the doors: Use
the mechanical key. ( P.412)
●Starting the hybrid system: P.413
■Customization
Settings (e.g. smart access system with
push-button start) can be changed. (Cus-
tomizable features: P.443)
If the smart access system with push-button
start has been deactivated by a customized
setting, refer to the explanations for the fol-
lowing operations.
●Locking and unlo cking the doors:
Use the wireless remote control or
mechanical key. ( P.110, 412)
●Starting the hybrid system and changing
power switch modes: P.413
●Stopping the hybrid system: P.176

4137-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
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When trouble arises
■Locking the door
1 Move the inside lock button to the
lock position.
2 Close the door.
1 Ensure that the shift lever is in P and
depress the brake pedal.
2 Touch the Lexus emblem side of the
electronic key to the power switch.
When the electronic key is detected, a
buzzer sounds and the power switch will
turn to ON mode.
When the smart access system with push-
button start is deactivated in customization
setting, the power switch will turn to ACCESSORY mode.
3
Firmly depress the brake pedal and
check that message shown on the
multi-information display.
4 Press the power switch.
In the event that the hybrid system still can-
not be operated, contact your Lexus
dealer.
■Stopping the hybrid system
Set the parking brake, shift the shift lever to
P and press the power switch as you nor-
mally do when stopping the hybrid system.
■Electronic key battery
As the above procedure is a temporary
measure, it is recommended that the elec-
tronic key battery be replaced immediately
when the battery is depleted.
■Alarm
Using the mechanical ke y to lock the doors
will not set the alarm system. If a door is
unlocked using the me chanical key when
the alarm system is set, the alarm may be
triggered.
WARNING
■When using the mechanical key and
operating the power windows or
moon roof
Operate the power window or moon
roof after checking to make sure that
there is no possibilit y of any passenger
having any of their body parts caught in
the window or moon roof.
Also, do not allow ch ildren to operate the
mechanical key. It is possible for children
and other passengers to get caught in
the power window or moon roof.
Starting the hybrid system

4147-2. Steps to take in an emergency
LEXUS NX300h Owners Manual_USA_M78578_en
■Changing power switch modes
Release the brake pedal and press the
power switch in step 3 above.
The hybrid system does not start and modes
will be changed each time the switch is
pressed. ( P.177)
If you have a set of jumper (or booster)
cables and a second vehicle with a 12-
volt battery, you can jump start your
vehicle by following the steps below.
1 Confirm that the electronic key is
being carried.
When connecting the jumper (or booster)
cables, depending on the situation, the
alarm may activate and the doors may lock.
( P.78)
If the 12-volt battery is dis-
charged
The following procedures may be
used to start the hybrid system if the
vehicle’s 12-volt battery is dis-
charged.
You can also call your Lexus dealer
or a qualified repair shop.
Restarting the hybrid system

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

480Alphabetical Index
LEXUS NX300h Owners Manual_USA_M78578_en
Switch
ASC (Active Sound Control) dial ..... 188
Automatic High Beam switch ...............193
Brake hold switch........................................187
BSM (Blind Spot Monitor) main switch......................................................................... 262
Cruise control switch .............................. 237
Door lock switch............................................112
Driving mode select switch .................. 270
Driving position memory switches .... 138
Emergency flashers switch .................. 380
EV drive mode switch ..............................178
Fog light switch .............................................196
Garage door opener switches .......... 322
Heated steering wheel............................ 299
HUD (Head-up display) switches ....... 95
Ignition switch................................................ 174
LDA switch ..................................................... 231
Light switches ............................................... 190
LTA switch .................................................... 223
Meter control switches .............................. 89
Moon roof switches .................................. 150
Outside rear view mirror switches .....146
Paddle shift switches ..................................182
Parking brake switch ................................ 184
Power back door opener and closer switch................................................................117
Power switch ................................................. 174
Power window switch .............................. 148
Rear window and outside rear view mir- ror defoggers switch ............................ 292
Rear window wiper and washer switch ...........................................................................201
Seat heater switches ................................ 299
“SOS” button .................................................. 60
Tire pressure warning reset switch .. 363
Vehicle-to-vehicle distance switch .. 237
VSC off switch ............................................ 273
Window lock switch ..................................149
Windshield wipers and washer switch ................................................................ 196, 201T
Tachometer....................................................... 84
Tail lights Light switch .................................................... 190
Replacing light bulbs ................................375
Theft deterrent system Alarm....................................................................77
Immobilizer system ...................................... 75
Tire inflation pressure Maintenance data ..................................... 430
Warning light ...............................................394
Tire information ............................................ 434 Glossary ........................................................ 438
Size ....................................................................436
Tire identification number......................435
Uniform Tire Quality Grading ............ 437
Tire pressure warning system Function ......................................................... 359
Initializing........................................................363
Installing tire pres sure warning valves
and transmitters.......................................362
Registering ID codes ...............................364
Warning light ...............................................394
Tires................................................................... 357 Chains ............................................................ 280
Checking .......................................................357
Glossary ........................................................ 438
If you have a flat tire ..................................402
Inflation pressure ........................... 365, 430
Replacing .......................................................402
Rotating tires ............................................... 358
Size ................................................................... 430
Snow tires ...................................................... 279
Spare tire ........................................... 402, 430
Tire identification number......................435
Tire pressure warning system ............ 359
Uniform Tire Quality Grading ............ 437
Warning light ...............................................394
Tools.................................................................. 402
Top tether strap............................................... 57
Total load capacity ...................................... 424