sensor LEXUS IS300 2021 Repair Manual

3417-2. Steps to take in an emergency
7
When trouble arises
*1: This light illuminates on the center panel.
*2: Rear passengers’ seat belt warning buzzer:
The rear passengers’ seat belt warning buzzer sounds to alert the rear passenger that his or
her seat belt is not fastened. If the seat belt is unfastened, the buzzer sounds intermittently
for a certain period of time, af ter the seat belt is fastened and unfastened and the vehicle
reaches a certain speed.
■Tire pressure warning light
■LTA indicator (warning buzzer)
■Intuitive parking assist OFF indicator (warning buzzer)
Warning lightDetails/Actions
When the light comes on after blinking for approximately 1 minute:
Malfunction in the tire pressure warning system
 Have the system checked by your Lexus dealer.
When the light comes on:
Low tire inflation pressure such as
 Natural causes
 Flat tire
 Immediately stop the vehicle in a safe place.
Handling method ( P.344)
Warning lightDetails/Actions
(orange)
Indicates a malfunction in th e LTA (Lane Tracing Assist)
 Follow the instructions displayed on the multi-information display.
(  P.189)
Warning lightDetails/Actions
(flashes)
(if equipped)
Indicates a malfunction in the in tuitive parking assist function
 Have the vehicle inspected by your Lexus dealer immediately.
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.
 Follow the instructions displayed on the multi-information display.
(  P.212)

3427-2. Steps to take in an emergency
■RCTA OFF indicator (warning buzzer)
■PKSB OFF indicator (warning buzzer)
■PCS warning light
Warning lightDetails/Actions
(flashes)
(if equipped)
Indicates a malfunction in the RCTA (Rear Cross Traffic Alert) function
 Have the vehicle inspected by your Lexus dealer immediately.
Indicates that the rear bumper around the radar sensor is covered with
dirt, etc. ( P.204)
 Follow the instructions displayed on the multi-information display.
(  P.217)
Warning lightDetails/Actions
(flashes)
(if equipped)
When a buzzer sounds:
Indicates a malfunction in the PK SB (Parking Support Brake) system
 Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.
 Follow the instructions displayed on the multi-information display.
(  P.225, 346)
Warning lightDetails/Actions
(flashes or illumi-
nates)
When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-Collision System).
 Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
The PCS (Pre-Collision System) has become temporarily unavailable,
corrective action may be necessary.
 Follow the instructions displayed on the multi-information display.
(  P.168, 347)
If the PCS (Pre-Collision System) or VSC (Vehicle Stability Control)
system is disabled, the PCS warning light will illuminate.
 P.179

3437-2. Steps to take in an emergency
7
When trouble arises
■Slip indicator
■Parking brake indicator (warning buzzer)
■Brake hold operated indicator (warning buzzer)
■Warning buzzer
In some cases, the bu zzer may not be heard
due to being in a noisy location or audio
sound.
■Front passenger detection sensor, seat
belt reminder and warning buzzer
●If luggage is placed on the front passen-
ger seat, the front passenger detection
sensor may cause th e warning light to
flash and the warning buzzer to sound
even if a passenger is not sitting in the
seat.
●If a cushion is placed on the seat, the sen-
sor may not detect a passenger, and the
warning light may not operate properly.
■SRS warning light
This warning light system monitors the air-
bag sensor assembly, fr ont impact sensors,
side impact sensors (front door), side
impact sensors (front), side impact sensors
(rear), driver’s seat position sensor, driver’s
seat belt buckle sw itch, front passenger
occupant classificatio n system (ECU and
sensors), “AIR BAG ON” indicator light,
“AIR BAG OFF” indicator light, front pas-
senger’s seat belt buckle switch, seat belt
pretensioners and force limiters, airbags,
interconnecting wiring and power sources.
(  P.28)
■If the malfunction indicator lamp comes
on while driving
First check the following:
Warning lightDetails/Actions
Indicates a malfunction in:
 The VSC system;
 The TRAC system; or
 The hill-start assist control system
 Have the vehicle inspected by your Lexus dealer immediately.
Warning lightDetails/Actions
(flashes)
(U.S.A.)
or
(flashes)
(Canada)
It is possible that the parking brake is not fully engaged or released
 Operate the parking brake switch once again.
This light comes on when the parking brake is not released. If the light
turns off after the parking brake is fu lly released, the system is operating
normally.
Warning lightDetails/Actions
(flashes)
Indicates a malfunction in the brake hold system
 Have the vehicle inspected by your Lexus dealer immediately.

3477-2. Steps to take in an emergency
7
When trouble arises
■If “Engine Stopped Steering Power
Low” is displayed
This message is displa yed if the engine is
stopped while driving.
When steering wheel operations are
heavier than usual, grip the steering wheel
firmly and operate it using more force than
usual.
■If “Auto Power Off to Conserve Battery”
is displayed
Power was turned off due to the automatic
power off function. Next time when starting
the engine, increase the engine speed
slightly and maintain that level for approxi-
mately 5 minutes to recharge the battery.
■If “Headlight System Malfunction Visit
Your Dealer” is displayed
The following systems may be malfunction-
ing. Have the vehicle inspected by your
Lexus dealer immediately.
●The LED headlight system
●The automatic headlight leveling system
(if equipped)
●Automatic High Beam
■If “Radar Cruise Control Unavailable
See Owner's Manual” is displayed
The dynamic radar cruise control with
full-speed range system is suspended tem-
porarily or until the problem shown in the
message is resolved. (causes and coping
methods: P.168)
■If “Radar Cruise Control Unavailable” is
displayed
The dynamic radar cruise control with
full-speed range system cannot be used
temporarily. Use the system when it
becomes available again.
■If a message that indicates the malfunc-
tion of front camera is displayed
The following systems may be suspended
until the problem shown in the message is
resolved. ( P.168, 337)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Automatic High Beam
●RSA (Road Sign Assist) (if equipped)
●Dynamic radar cruise control with
full-speed range
■If a message that indicates the malfunc-
tion of radar sensor is displayed
The following systems may be suspended
until the problem shown in the message is
resolved. ( P.168, 337)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Dynamic radar cruise control with
full-speed range
■If “Maintenance Required Soon” is dis-
played
Indicates that all maintenance according to
the driven distance on the maintenance
schedule
* should be performed soon.
Comes on approximately 4500 miles
(7200 km) after the message has been
reset. If necessary, perform maintenance.
Please reset the message after the mainte-
nance is performed. ( P.286)
*: Refer to the separate “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the main tenance interval
applicable to your vehicle.
■If “Maintenance Required Visit Your
Dealer” is displayed
Indicates that all mainte nance is required to
correspond to the driven distance on the
maintenance schedule
*.
Comes on approximately 5000 miles
(8000 km) after the message has been
reset. (The indicator will not work properly
unless the message ha s been reset.) Per-
form the necessary maintenance. Please
reset the message after the maintenance is
performed. ( P.286)
*: Refer to the separate “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the main tenance interval
applicable to your vehicle.
■If “Oil Maintenance Required Soon” is
displayed
Indicates that the engine oil should be
scheduled to be changed.

3998-2. Customization
8
Vehicle specifications
■Turn signal lever (P.142)
*1: After flashing the turn signal lights when turnin g left or right while this function is off and
the turn signal lever is moved to the first positi on in the direction of the flashing light, the
turn signal lights can be sele cted to be flashing or off.
*2: The turn signal lights keep flashing if the turn signal lever is moved to the first position in
the direction of flashing light.
*3: The turn signal lights will be off if the turn si gnal lever is moved to the first position in the
direction of flashing light.
■Automatic light control system ( P.149)
■Lights ( P.149)
*: U.S.A. only
■PCS (Pre-Collision System) ( P.170)
FunctionDefault settingCustomized setting
The number of times the turn
signal lights flash automati-
cally when the turn signal
lever is moved to the first
position during a lane
change
*1
3
5
——O
7
Off*2
Off*3
FunctionDefault settingCustomized setting
Light sensor sensitivityStandard-2 to 2O—O
Time elapsed before head-
lights automatically turn off
after doors are closed
30 seconds
Off
O—O60 seconds
90 seconds
FunctionDefault settingCustomized setting
Daytime running lights*OnOffO—O
FunctionDefault settingCustomized setting
PCS (Pre-Collision System)OnOff—O—
Adjust alert timingMiddleEarly—O—Late
ABC
ABC
ABC
ABC

419What to do if... (Troubleshooting)
depleted?
In this case, the engine can be started in a
temporary way. (P.360)
Is the battery discharged? ( P.361)
 Is the engine switch in IGNITION
ON mode?
If you cannot release the shift lever by
depressing the brake pedal with the engine
switch in IGNITION ON mode. ( P.139)
 It is locked automatically to prevent
theft of the vehicle. ( P.134)
 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.119)
 The auto power off function will be
operated if the vehicle is left in
ACCESSORY or IGNITION ON
mode (the engine is not running) for
a period of time. ( P.136) 
The seat belt reminder light is flash-
ing
Are the driver and the front passenger
wearing the seat belts? ( P.340)
 The parking brake indicator is on
Is the parking brake released? ( P.143)
Depending on the situation, other
types of warning buzzer may also
sound. ( P.337, 346)
 Did anyone inside the vehicle open
a door during setting the alarm?
The sensor detects it and the alarm sounds.
( P.62)
Do one of the following to deactivate
or stop the alarm:
 Unlock the doors.
 Open the trunk.
 Turn the engine switch to ACCES-
SORY or IGNITION ON mode, or
start the engine. (The alarm will be
deactivated or stopped after a few
seconds.)
 Is the electronic key left inside the
vehicle or the moon roof opened?
Check the message on the multi-informa-
tion display. ( P.346)
The shift lever cannot be shifted
from P even if you depress the
brake pedal
The steering wheel cannot be
turned after the engine is
stopped
The windows do not open or
close by operating the power
window switches
The engine 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

422Alphabetical Index
BuzzerHands off steering wheel warning (LTA).......................................................................... 188
C
Card key ............................................................ 88
Care Exterior ...........................................................280
Interior ............................................................. 283
Seat belts........................................................ 283
Wheels and wheel ornaments............280
Cargo capacity...............................................132
Cargo net ....................................................... 268
Center Display ............................................. 250
Chains .............................................................. 244
Child restraint system Fixed with a LATCH system .................. 49
Fixed with a seat belt................................... 45
Front passenger occupant classification system ............................................................. 36
Points to remember ...................................... 41
Riding with children ....................................... 41
Types of child restraint system installation method ............................................................42
Using an anchor bracket ............................ 51
Child safety Airbag precautions...................................... 33
Battery precautions .................................. 364
Child restraint system..................................42
Heated steering wheel and seat heater precautions.................................................. 261
How your child should wear the seat belt ............................................................................ 25
Moon roof precautions ............................ 122
Power window lock switch...................... 119
Power window precautions .................... 119
Rear door child-protectors ..................... 94
Removed electronic key battery precau- tions ................................................................. 317
Seat belt extender precautions ............. 25
Seat belt precautions .................................... 41
Trunk precautions ........................................ 96 Child-protectors............................................. 94
Cleaning
Exterior........................................................... 280
Interior .............................................................283
Radar sensor ................................................. 164
Seat belts ........................................................283
Wheels and wheel ornaments ........... 280
Clock ..................................................71, 72, 270
Coat hooks..................................................... 270
Condenser .....................................................300
Console box ...................................................267
Consumption screen .................................... 83
Cooling system............................................. 298 Engine overheating.................................. 365
Cruise control Dynamic radar cruise control with full-speed range ........................................192
Cup holders ....................................................267
Current fuel consumption ...........................79
Curtain shield airbags .................................. 28
Customizable features .............................. 394
D
Daytime running light system ...................149
Defogger Outside rear view mirrors.....................255
Rear window ................................................255
Windshield ....................................................255
Differential Front differential oil............. ....................... 377
Rear differential oil......... ..................... ....... 377
Dimensions .................................................... 372
Dinghy towing.................................................133
Display Center Display ........................................... 250
Dynamic radar cruise control with full-speed range ........................................192
Intuitive parking assist ............................... 210
LTA (Lane Tracing Assist) ..................... 185
Multi-information display .......................... 76
RCTA.................................................................216
Warning message .....................................346

427Alphabetical Index
MirrorsInside rear view mirror................................114
Outside rear view mirror defoggers255
Outside rear view mirrors ....................... 116
Vanity mirrors................................................ 271
Moon roof Door lock linked moon roof operation.............................................................................121
Jam protection function..............................121
Operation........................................................120
Multi-information display .............................76 Audio system-linked display.....................81
Boost gauge....................................................80
Drive information 1/Drive information 2/Drive information 3............................. 79
Driving information display...................... 78
Driving support system information dis- play .....................................................................81
Dynamic radar cruise control with full-speed range ........................................ 192
Eco Driving Indicator .................................80
Engine oil pressure gauge .......................80
Engine oil temperature gauge ...............80
Gear Position ...................................................81
G-force..............................................................80
LTA (Lane Tracing Assist)..................... 185
Menu icons ....................................................... 77
Meter control switches ............................... 77
Navigation system-linked display ..........81
Pop-up display............................................... 76
Settings .............................................................. 82
Speedometer..................................................80
Tire pressure ............................................... 305
Warning message..................................... 346
N
Navigation system-linked display..............81
Noise from under vehicle .............................. 5
O
“ODO TRIP” switch .......................................75 Odometer ......................................................... 75
Odometer and trip meter display
Display items ................................................... 75
“ODO TRIP” switch .................................... 75
Pop-up display ............................................... 75
Oil Engine oil........................................................ 374
Front differential oil............. ....................... 377
Rear differential oil......... ..................... ....... 377
Opener Fuel filler door ................................................. 161
Hood ................................................................293
Trunk ................................................................... 97
Outer foot lights Location ..........................................................263
Outside rear view mirrors Adjustment ....................................................... 116
BSM (Blind Sport Monitor)..................202
Folding................................................................ 117
Linked mirror functi on when reversing
............................................................................. 116
Mirror position memory ..........................108
Outside rear view mirror defoggers255
RCTA function ..............................................216
Outside temperature.............................. 71, 72
Overheating .................................................. 365
P
Paddle shift switches ........................... 140, 141
Panic mode ....................................................... 90
Parking assist sensors (intuitive parking assist) ...............................................................210
Parking brake Operation ........................................................143
Parking brake engaged warning buzzer........................................................................... 145
Warning light ...............................................343
Warning message ...................................... 145
Parking lights Light switch .................................................... 149
Replacing light bulbs ................................ 322

429Alphabetical Index
Pregnant women, proper seat belt use.............................................................................24
Reminder light and buzzer ...................340
Seat belt extender ........................................ 25
Seat belt pretensioners ...............................27
SRS warning light ......................................338
Seat heaters ..................................................... 261
Seat position memory................................. 108
Seat ventilators ............................................... 261
Seating capacity.............................................132
Seats Adjustment..................................................... 106
Adjustment precautions .......................... 106
Child seats/child restraint system installa-tion ...................................................................... 41
Cleaning......................................................... 283
Driving position memory........................ 108
Head restraints ................................................ 111
Power easy access system .................... 108
Properly sitting in the seat .........................23
Seat heaters .................................................... 261
Seat position memory .............................. 108
Seat ventilators.............................................. 261
Sensor Automatic headlight system...................149
Automatic High Beam system............... 151
Inside rear view mirror............................... 115
Intuitive parking assist................................210
LTA (Lane Tracing Assist)..................... 180
Parking Support Brake function (rear-crossing vehicles)...................... 232
Parking Support Brake function (static objects).........................................................227
Radar sensor..................................... 164, 204
Rain-sensing windshield wipers.......... 159
RCTA ................................................................ 217
Service reminder message ..................... 286
Shift lever Automatic transmission ........................... 138
Side airbags ...................................................... 28
Side marker lights Light switch .....................................................149 Replacing light bulbs ................................ 322
Side mirrors Adjustment ....................................................... 116
BSM (Blind Sport Monitor)..................202
Folding................................................................ 117
Linked mirror functi on when reversing
............................................................................. 116
Mirror position memory ..........................108
RCTA function ..............................................216
Side turn signal lights Replacing light bulbs ................................ 322
Turn signal lever ...........................................142
Side windows ................................................... 118
Smart access system with push-button startAntenna location ........................................... 99
Entry functions ................................................ 92
Starting the engine ......................................134
Snow mode ..................................................... 140
Snow tires ....................................................... 243
Spare tire......................................................... 349 Storage location ........................................ 350
Spark plug ...................................................... 376
Specifications ................................................ 372
Speedometer .................................... 71, 72, 80
Steering lock Column lock release ..................................134
Steering lock system warning message............................................................................134
Steering wheel Adjustment ....................................................... 113
Heated steering wheel ..............................261
Meter control switches ...............................77
Power easy access system .................... 108
Steering wheel position memory........108
Stop lights Replacing light bulbs ................................ 322
Storage features .......................................... 266
Stuck If the vehicle becomes stuck ............... 368
Sun visors .......................................................... 271