warning lights LEXUS RX450h 2022 Owner's Guide

4107-2. Steps to take in an emergency
■Brake system warning light
■Brake system warning light
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
If a warning light turns on or a warning buzzer sounds
Calmly perform the followin g actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, bu t then goes off, this does not necessar-
ily indicate a malfunction in the system. However, if this continues to occur,
have the vehicle inspected by your Lexus dealer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
(U.S.A.)
or
(red)
(Canada)
Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and contact your Lexus
dealer. Continuing to drive the vehicle may be dangerous.
Warning lightDetails/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 lightDetails/Actions
Indicates that the engine coolant temperature is too high
Immediately stop the vehicle in a safe place.
Handling method ( P.446)

4187-2. Steps to take in an emergency
If the tire pressure warning light comes
on
1 After the temperature of the tires has
lowered sufficiently, check the inflation
pressure of each tire and adjust them to
the specified level.
2 If the warning light does not turn off
even after several minutes have
elapsed, check that the inflation pres-
sure of each tire is at the specified level
and perform initialization. ( P.378)
If the warning light does not turn off several
minutes after the initia lization has been per-
formed, have the vehicle inspected by your
Lexus dealer immediately.
■The tire pressure warning light may
come on due to natural causes
The tire pressure warning light may come
on due to natural causes such as natural air
leaks and tire inflation pressure changes
caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the
warning light (after a few minutes).
■When a tire is replaced with a spare tire
The compact spare tire is not equipped with
a tire pressure warning valve and transmit-
ter. If a tire goes flat , the tire pressure warn-
ing light will not turn off even though the flat
tire has been replaced with the spare tire.
Replace the spare tire with the repaired tire
and adjust the tire inflation pressure. The
tire pressure warning light will go off after a
few minutes.
■Conditions that the tire pressure warn-
ing system may not function properly
P.377
■Customization
Some functions can be customized.
(  P.472)
WARNING
■If both the ABS and the brake system
warning lights remain on
Stop your vehicle in a safe place immedi-
ately and contact your Lexus dealer.
The vehicle will become extremely
unstable during br aking, and the ABS
system may fail, which could cause an
accident resulting in death or serious
injury.
■When the electric power steering
system warning light comes on
When the light comes on yellow, the
assist to the power st eering is restricted.
When the light comes on red, the assist
to the power steering is lost and handling
operations of the steering wheel become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual.
■If the tire pressure warning light
comes on
Be sure to observe the following precau-
tions.
Failure to do so could cause a loss of
vehicle control and result in death or
serious injury.
●Stop your vehicle in a safe place as
soon as possible. Adjust the tire infla-
tion pressure immediately.
●If the tire pressure warning light comes
on even after tire inflation pressure
adjustment, it is prob able that you have
a flat tire. Check the tires. If a tire is flat,
change it with the spare tire and have
the flat tire repaired by the nearest
Lexus dealer.
●Avoid abrupt maneuvering and brak-
ing.
If the vehicle tires deteriorate, you
could lose control of the steering
wheel or the brakes.

505Alphabetical Index
Alphabetical Index
A
A/CAir conditioning filter ...............................383
Front automatic air conditioning system.........................................................................298
Front seat concentr ated airflow mode
(S-FLOW).................................................306
Rear automatic air conditioning system .........................................................................309
ABS (Anti-lock Brake System).............. 278 Warning light ................................................. 412
ACA (Active Cornering Assist) ........... 279
Active Cornering Assist (ACA) ........... 279
Adaptive Front-lighting System (AFS)200
Adaptive Variable Suspension System279
AFS (Adaptive Front- lighting System)200
AHB (Automatic High Beam) .................201
Air conditioning filter ................................. 383
Air conditioning system Air conditioning filter ...............................383
Front automatic air conditioning system.........................................................................298
Front seat concentr ated airflow mode
(S-FLOW).................................................306
Rear automatic air conditioning system .........................................................................309
Airbags Airbag operating conditions................... 33
Airbag precautions for your child ........ 36
Correct driving posture ............................ 25
Curtain shield airbag operating condi- tions .................................................................. 33
Curtain shield airbag precautions ....... 36
Front passenger occupant classification system ............................................................. 39
General airbag precautions ................... 36
Locations of airbags.................................... 30
Modification and disp osal of airbags . 38
Side airbag operating conditions ......... 33
Side airbag precautions ............................ 36 Side and curtain shie
ld airbags operating
conditions ...................................................... 33
Side and curtain shield airbags precau- tions .................................................................. 36
SRS airbags......................................................30
SRS warning light.........................................412
Alarm ....................................................................74 Warning buzzer .......................................... 410
Anchor brackets ..................................... 46, 57
Antennas (smart acc ess system with
push-button start).......................................125
Anti-lock Brake System (ABS).............. 278 Warning light .................................................412
Approach warning...................................... 242
Armrest............................................................ 337
Assist grips ..................................................... 337
Audio system-linked display ...................... 92
Automatic headlight leveling system ....199
Automatic High Beam ................................201
Automatic light control system............... 198
Auxiliary boxes ..................................323, 326
Average fuel economy................................. 90
Average vehicle speed ................................ 90
AWD Control.................................................... 91
B
Back door .......................................................... 113
Back-up light Wattage ......................................................... 460
Back-up lights Replacing light bulbs................... 393, 399
Battery (12-volt battery) Battery checking ........................................370
If the 12-volt battery is discharged ......441
Preparing and checking before winter......................................................................... 286
Warning light .................................................. 411
Battery (traction battery) ............................ 69
Blind Spot Monitor (BSM)....................... 246
Bottle holders ................................................ 322
Brake Brake hold ...................................................... 196

506Alphabetical Index
Fluid ......................................................369, 457
Parking brake ................................................193
Regenerative braking ................................. 67
Warning light ................................................ 410
Brake assist .................................................... 278
Break-in tips.....................................................163
Brightness control Instrument panel light control ................ 87
BSM (Blind Spot Monitor)....................... 246
Buzzer Hands off steering wheel warning (LTA)......................................................................... 232
C
Care Exterior .......................................................... 350
Interior ............................................................. 353
Seat belts........................................................ 353
Wheels and wheel ornaments........... 350
Cargo capacity..................................... 167, 170
Cargo hooks ................................................. 324
Cargo net hooks .......................................... 324
Center Display ............................................. 294
Chains .............................................................. 287
Child restraint system Fixed with a LATCH system .................. 54
Fixed with a seat belt...................................50
Front passenger occupant classification system ............................................................. 39
Points to remember .................................... 45
Riding with children ..................................... 45
Types of child restraint system installation method ........................................................... 46
Using an anchor bracket .......................... 57
Child safety 12-volt battery precautions ....... 372, 445
Airbag precautions...................................... 36
Child restraint system................................. 46
Heated steering wheel and seat heater precautions.................................................. 312
How your child should wear the seat belt .............................................................................27 Moon roof precautions............................ 155
Panoramic moon roof precautions ... 158
Power back door precautions ............... 113
Power window lock switch .................... 153
Power window precautions .................. 152
Rear door child-protectors ..................... 112
Seat belt extender prec
autions.............. 27
Seat belt precautions .................................. 45
Child-protectors............................................. 112
Cleaning Exterior........................................................... 350
Interior .............................................................353
Radar sensor .................................................. 212
Seat belts ........................................................353
Wheels and wheel ornaments ........... 350
Clock ....................................................... 83, 338
Coat hooks..................................................... 338
Coin box.......................................................... 322
Compass ......................................................... 346
Condenser ..................................................... 368
Console box .................................................. 320
Cooling system............................................. 367 Engine overheating...................................446
Hybrid system overheating ................. 448
Cornering lights ...........................................200 Replacing light bulbs................................393
Cruise control Dynamic radar cruise control with full-speed range ......................................236
Cup holders .....................................................321
Current fuel consumption .......................... 90
Curtain shield airbags .................................. 30
Customizable features ...............................472
D
Daytime running light system .................. 198
Defogger Outside rear view mirrors.................... 300
Rear window ............................................... 300
Windshield ................................................... 300
Differential Rear differential oil.....................................457

507Alphabetical Index
Dimension ...................................................... 452
Dinghy towing.................................................. 181
DisplayCenter Display............................................ 294
Dynamic radar cruise control with full-speed range ...................................... 236
Energy monitor.............................................. 99
Head-up display ........................................... 95
Intuitive parking assist.............................. 252
LTA (Lane Tracing Assist).................... 230
Multi-information display ..........................88
RCTA .............................................................. 259
Warning message..................................... 420
Distance until next engine oil change .... 87
Do-it-yourself maintenance .................... 357
Door courtesy lights .....................................315 Wattage..........................................................460
Door lock Power back door.......................................... 113
Side doors ...................................................... 109
Smart access system with push-button start .................................................................. 125
Wireless remote control..........................107
Door pockets ................................................ 322
Doors Automatic door lock ing and unlocking
system ..............................................................112
Door glasses ................................................... 151
Door lock warning buzzer ...................... 110
Open door warning buzzer ....................112
Outside rear view mirrors ..................... 148
Rear door child-protectors ......................112
Side doors ...................................................... 109
Drive distance .................................................. 90
Driver’s seat position memory Driving position memory........................ 140
Memory recall function ..............................141
Power easy access system .................... 140
Drive-start control ........................................163
Driving Break-in tips ...................................................163
Correct driving posture ............................ 25 Driving mode select switch .................. 276
Hybrid vehicle driving tips ....................284
Procedures .....................................................162
Winter drive tips ........................................ 286
Driving assist system information ............ 92
Driving information display ........................ 90
Driving position memory........................... 140 Memory recall function.............................. 141
Power easy access system .................... 140
Driving range ................................................... 90
Dynamic radar cruise control with full-speed range ........................................ 236 Warning message ..................................... 244
E
ECB (Electronically Controlled Brake Sys-
tem) ................................................................ 278
EDR (Event data recorder) ........................... 8
E-Four .............................................................. 279
Elapsed time ..................................................... 90
Electric motor (traction motor) ................ 66
Electric Power Steering (EPS) .............. 279 Warning light .................................................413
Electronic key ................................................ 106 Battery-saving function.............................126
If the electronic key does not operate properly .......................................................439
Replacing the battery .............................. 386
Electronic sunshade Jam protection function ............................157
Operation ....................................................... 156
Electronically Controlled Brake System (ECB) ............................................................ 278
Emergency flashers .................................... 402
Emergency, in case of If a warning buzzer sounds.................... 410
If a warning light turns on........................ 410
If a warning message is displayed.....420
If the 12-volt battery is discharged ......441
If the electronic key does not operate properly .......................................................439

508Alphabetical Index
If the fuel filler door cannot be opened.........................................................................438
If the hybrid system will not start ........ 436
If the vehicle is submerged or water on the road is rising......................................403
If you have a flat tire .................................. 424
If you lose your keys.................................438
If you think something is wrong .........409
If your vehicle becomes stuck............. 449
If your vehicle has to be stopped in an
emergency ................................................ 402
If your vehicle needs to be towed .....405
If your vehicle overheats ........................ 446
Energy monitor .....................................99, 100
Engine ACCESSORY mode .............................. 185
Compartment .............................................365
Engine switch.................................................182
Hood................................................................ 363
How to start the hybrid system ............182
Identification number ............................... 453
If the hybrid system will not start ........ 436
If your vehicle has to be stopped in an
emergency ................................................ 402
Ignition switch (power switch) ..............182
Overheating................................................. 446
Power switch .................................................182
Tachometer ..................................................... 83
Engine coolant Capacity .........................................................456
Checking ....................................................... 367
Preparing and checking before winter.........................................................................286
Engine coolant temperature gauge ....... 83
Engine oil Capacity .........................................................455
Checking .......................................................365
Preparing and checking before winter.........................................................................286
Warning light ...................................................411
Engine oil maintenance data .................. 367 Engine switch (power switch) ..................182
If your vehicle has to be stopped in an emergency .................................................402
EPS (Electric Power Steering) .............. 279 Warning light .................................................413
EV drive mode................................................187
EV indicator .......................................................67
Event data recorder (EDR) ........................... 8
F
Flat tire Tire pressure warning system ............. 376
Vehicles with a spare tire....................... 424
Floor mats .......................................................... 24
Fluid Brake ................................................................ 457
Hybrid transmission.................................. 457
Washer .......................................................... 369
Fog lights Switch...............................................................204
Footwell light ...................................................315
Front automatic air conditioning system .......................................................................... 298
Front fog lights Replacing light bulbs................................393
Front passenger footwell hooks ............ 340
Front passenger occupant classification system .............................................................. 39
Front seats Adjustment ......................................................129
Cleaning .........................................................353
Correct driving posture ............................ 25
Driving position memory ........................ 140
Head restraints..............................................143
Memory recall function.............................. 141
Power easy access system .................... 140
Seat heaters ....................................................312
Seat position memory .............................. 140
Seat ventilators ..............................................312
Front side marker light Light switch .................................................... 198
Replacing light bulbs................................393

509Alphabetical Index
Front side marker lightsReplacing light bulbs................................ 393
Wattage..........................................................460
Front turn signal lights Replacing light bulbs................... 393, 395
Turn signal lever ........................................... 192
Wattage..........................................................460
Fuel Capacity ......................................................... 454
Fuel gauge ....................................................... 83
Information ......................................................461
Refueling ........................................................209
Type.................................................................. 454
Warning light .................................................413
Fuel consumption Average fuel economy .............................. 90
Current fuel consumption........................ 90
Fuel filler door If the fuel filler door cannot be opened.........................................................................438
Refueling ........................................................209
Fuel gauge ......................................................... 83
Fuses .................................................................388
G
Garage door opener ...................................341
Gauges ............................................................... 83
G-force................................................................. 91
Glove box ....................................................... 320
Glove box light ............................................. 320
Grocery bag hooks .................................... 324
H
Hands Free Power Back Door ................. 116
Head restraints ...............................................143
Headlight aim ................................................ 390
Headlights Adaptive Front-lighting System (AFS).........................................................................200
Automatic High Beam system..............201
Light switch .................................................... 198 Replacing light bulbs................................393
Head-up display.............................................. 95 Driving information display area ...........95
HUD (Head-up display) switch ............ 96
Hybrid System Indicator ........................... 99
Navigation system-linked display ........98
Settings............................................................... 97
Heated steering wheel ................................312
Heaters Front automatic air conditioning system......................................................................... 298
Heated steering wheel ..............................312
Outside rear view mirrors.................... 300
Rear automatic air conditioning system
......................................................................... 309
Seat heaters ....................................................312
High mounted stoplight Replacing light bulbs................................393
High-voltage components ......................... 69
Hill-start assist control ............................... 279
Hood Open................................................................363
Hooks Cargo hooks................................................ 324
Cargo net hooks........................................ 324
Coat hooks .................................................. 338
Front passenger footwell hooks........ 340
Grocery bag hooks.................................. 324
Retaining hooks (floor mat) ..................... 24
Horn ....................................................................146
HUD (Head-up display) switch ................ 96
Hybrid battery (traction battery) Location ............................................................. 69
Specification .................................................454
Warning message ........................................ 72
Hybrid battery (traction battery) air vents ............................................................................... 71
Hybrid system .................................................. 66 Acoustic Vehicle Aler ting System .......68
Emergency shut off system...................... 72
Energy monitor/co nsumption screen99
EV drive mode............................................. 187

510Alphabetical Index
High voltage components ....................... 69
Hybrid system precautions ..................... 69
If the hybrid system will not start ........ 436
Overheating.................................................448
Power (ignition) switch.............................182
Regenerative braking ................................. 67
Starting the hybrid system.......................182
Hybrid System Indicator......................85, 99
Hybrid transmission..................................... 189 M mode ............................................................. 191
Paddle shift switches .........................190, 191
Hybrid vehicle driving tips ....................... 284
I
I/M test ............................................................ 360
Identification Engine ............................................................. 453
Vehicle ............................................................ 452
If your vehicle has to be stopped in an
emergency .................................................. 402
Ignition switch (power switch) .................182 Auto power off function .......................... 185
Changing the power switch modes . 185
If your vehicle has to be stopped in an
emergency ................................................ 402
Immobilizer system......... ................................73
Indicators ........................................................... 80
Initialization Items to initialize .........................................485
Maintenance ....................................356, 367
Power windows............................................. 151
Tire pressure warning system ............. 378
Inside rear view mirror ................................ 147
Instrument panel light control ................... 87
Interior lights....................................................315 Front interior light ........................................315
Rear interior light .........................................315
Intuitive parking assist.....................250, 252 Function .......................................................... 252
Warning message..................................... 254
J
JackPositioning a floor jack ............................363
Vehicle-equipped jack ...........................425
Jack handle .................................................... 425
Jam protection function Electronic sunshade ...................................157
Moon roof ...................................................... 154
Panoramic moon roof ...............................157
Power back door.......................................... 119
Power windows ............................................. 151
Rear seats ....................................................... 130
K
Keyless entrySmart access system with push-button start ................................................................. 125
Wireless remote control ......................... 107
Keys Battery-saving function.............................126
Electronic key ............................................... 106
If the electronic key does not operate properly .......................................................439
If you lose your keys ................................ 438
Key number plate ....................................... 106
Keyless entry ....................................... 107, 125
Mechanical key ............................................ 106
Power switch................................................. 182
Replacing the battery .............................. 386
Warning buzzer .......................................... 125
Wireless remote control ......................... 107
Knee airbags .................................................... 30
L
Lane Tracing Assist (LTA) Operation ...................................................... 225
Warning messages................................... 233
Language (multi-infor mation display) ... 92
LATCH anchors ............................................. 54

511Alphabetical Index
LeverAuxiliary catch lever ................................. 363
Hood lock release lever......................... 363
Shift lever......................................................... 189
Turn signal lever ........................................... 192
Wiper lever................................................... 204
Lexus climate concierge .......................... 297
Lexus Enform Safety Connect.................. 60
Lexus Safety System + 2.0 AHB (Automatic High Beam)..............201
Dynamic radar cruise control with full-speed range ...................................... 236
LTA (Lane Tracing Assist).................... 225
PCS (Pre-Collision System)..................218
RSA (Road Sign Assist) ......................... 234
License plate lights Light switch .................................................... 198
Replacing light bulbs................................ 393
Light bulbs Replacing ....................................................... 392
Lights Automatic High Beam system..............201
Fog light switch ........................................... 204
Front interior lights ......................................315
Front personal lights...................................316
Headlight switch ......................................... 198
Interior lights...................................................315
Interior lights list............................................315
Rear interior lights .......................................315
Rear personal lights....................................316
Replacing light bulbs................................ 393
Turn signal lever ........................................... 192
Vanity lights ..................................................340
Wattage..........................................................460
Lock steering column ................................. 183
LTA (Lane Tracing Assist) Operation...................................................... 225
Warning messages .................................. 233
Luggage cover ............................................. 325M
Maintenance Do-it-yourself maintenance .................. 361
General maintenance .............................357
Maintenance data ......................................452
Maintenance requirements ................. 356
Malfunction indicator lamp ........................ 411
Master warning light .................................... 417
Menu icons........................................................ 89
Meter Clock...................................................................83
Hybrid System Indicator ...........................85
Indicators.......................................................... 80
Instrument panel light control................. 87
Meter control switches ..............................89
Meters.................................................................83
Multi-information display ......................... 88
Settings............................................................... 92
Units.......................................................................91
Warning lights .............................................. 410
Warning message .....................................420
Mirrors Inside rear view mirror ..............................147
Outside rear view mirror defoggers300
Outside rear view mirrors...................... 148
Vanity mirrors ............................................. 340
Moon roof Door lock linked moon roof operation........................................................................... 154
Door lock linked panoramic moon roof operation ......................................................157
Jam protection function ........................... 154
Operation ....................................................... 153
Multi-information display ............................ 88 Audio system-linked display ................... 92
AWD Control ..................................................91
Drive information ..........................................90
Driving assist system information ......... 92
Driving information display ......................90
Dynamic radar cruise control with full-speed range ......................................236

512Alphabetical Index
Energy monitor............................................ 100
G-force................................................................ 91
LTA (Lane Tracing Assist).................... 230
Menu icons ...................................................... 89
Meter control switches .............................. 89
Navigation system-linked display ........ 92
Pop-up display...............................................88
Settings .............................................................. 92
Suggestion function..................................... 93
Tire pressure ................................................ 376
Units ...................................................................... 91
Warning message..................................... 420
N
Navigation system-linked display....92, 98
Noise from under vehicle ...............................6
O
“ODO TRIP” switch ...................................... 87
Odometer ......................................................... 87
Odometer and trip meter displayDisplay items ................................................... 87
“ODO TRIP” switch .................................... 87
Pop-up display............................................... 87
Oil Engine oil .......................................................455
Rear differential oil .................................... 457
Opener Fuel filler door..............................................209
Hood................................................................ 363
Outer foot lights Location............................................................315
Outside door handle lights........................315
Outside rear view mirrors Adjustment..................................................... 148
BSM (Blind Sport Monitor) ................. 246
Folding ..............................................................149
Linked mirror function when reversing.......................................................................... 148
Mirror position memory.......................... 140
Outside rear view mirror defoggers300 RCTA function ............................................259
Outside temperature..... ............................... 83
Overheating .................................................. 446
P
Paddle shift switches ........................... 190, 191
Panic mode ......................................................107
Panoramic moon roof Jam protection function ............................157
Operation ....................................................... 156
Parking assist sensors (intuitive parking assist) ............................................................. 252
Parking brake Operation ....................................................... 193
Parking brake engaged warning buzzer........................................................................... 195
Warning light ................................................ 416
Warning message ...................................... 195
Parking lights Light switch .................................................... 198
Replacing light bulbs................................393
Parking Support Brake function (for rear-crossing vehicles) ...........................274 Function .......................................................... 274
Parking Support Brake function (static objects) ........................................................... 271 Function ............................................................ 271
PCS (Pre-Collision System) Function ........................................................... 218
PCS OFF switch ........................................220
Warning light ................................................ 416
Personal lights.................................................315
PKSA (Parking Support Alert) .............. 250
PKSB (Parking Support Brake)............. 265 Warning message ..................................... 270
Power back door ............................................ 113 Hands Free Power Back Door ............. 116
Smart access system with push-button start ................................................................... 114
Power control unit.......................................... 69
Power control unit coolant Capacity ........................................................ 456