2021 Lexus IS350 engine overheat

2625-2. Using the air conditioning system and defogger
light as follows:
Hi (3 segments lit) Mid (2 segments
lit)  Lo (1 segment lit) Off
■Operation condition
The engine switch is in IGNITION ON
mode.
■Seat heater timer control
To enable seat heater timer control, press
and hold the driver and front passenger
seat heater switches at the same time until a
buzzer sounds once. If a seat heater is
turned on while seat he ater timer control is
enabled, the intensity of the seat heater will
automatically change from Hi Mid Lo.
The timing of the change in seat heater
intensity differs depending on the tempera-
ture inside the cabin, etc. when the seat
heater is operating.
To disable seat heater timer control, press
and hold the driver and front passenger
seat heater switches at the same time until a
buzzer sounds twice.
Each time the switch is pressed, the
intensity of the seat ventilator changes
and the level indicator lights (green) light as follows:
Hi (3 segments lit) Mid (2 segments
lit)  Lo (1 segment lit) Off
■Operation condition
The engine switch is in IGNITION ON
mode.
■Seat ventilator
The seat ventilators pr ovide ventilation only,
and do not have a heating/cooling function.
WARNING
■To prevent overheating and minor
burn injuries
Observe the following precautions when
using the seat heaters.
●Do not cover the seat with a blanket or
cushion when using the seat heater.
●Do not use seat heater more than nec-
essary.
ASeat ventilators
A

327
7
7
When trouble arises
When trouble arises
.7-1. Essential informationEmergency flashers.................. 328
If your vehicle has to be stopped in an emergency .......................... 328
If the vehicle is trapped in rising water............................................ 329
7-2. Steps to take in an emergency If your vehicle needs to be towed......................................................... 331
If you think something is wrong ........................................................ 335
Fuel pump shut off system ..... 336
If a warning light turns on or a warning buzzer sounds ....... 337
If a warning message is displayed ........................................................ 346
If you have a flat tire.................. 349
If the engine wi ll not start .......357
If you lose your keys ................. 358
If the fuel filler door cannot be opened........................................ 359
If the electronic key does not operate properly .................... 359
If the vehicle battery is discharged ......................................................... 361
If your vehicle overheats ........ 365
If the vehicle becomes stuck ........................................................ 368

3657-2. Steps to take in an emergency
7
When trouble arises
1Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the engine.
2 If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the engine has cooled down
sufficiently, inspect the hoses and radiator core (radiator) for any
leaks.
Radiator
Cooling fans
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4
The coolant level is satisfactory if it
is between the “FULL” or “F” and
“LOW” or “L” lines on the reservoir.
Engine (IS350
AWD/IS350/IS300 AWD)
Reservoir cap
“FULL” line
“LOW” line
If your vehicle overheats
The following may indicate that
your vehicle is overheating.
 The needle of the engine coolant
temperature gauge ( P.71)
enters the red zone or a loss of
engine power is experienced.
(For example, the vehicle speed
does not increase.)
 “Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” is shown on the
multi-information display.
 Steam comes out from under the
hood.
Correction procedures
A
B
A
B
C

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

423Alphabetical Index
Distance until next engine oil change .....75
Do-it-yourself maintenance .................... 287
Door courtesy lights ................................... 263Wattage........................................................... 381
Door lock Doors.................................................................. 92
Smart access system with push-button start ................................................................... 99
Wireless remote control........................... 90
Doors Automatic door lock ing and unlocking
system ............................................................. 95
Door glasses ................................................... 118
Door lock.......................................................... 92
Open door warning buzzer .......... 93, 94
Outside rear view mirrors ....................... 116
Rear door child-protectors ..................... 94
Drive distance ...................................................79
Drive info 1/Drive info 2/Drive info 3.....79
Driver’s seat position memory Driving position memory........................ 108
Memory recall function ........................... 109
Power easy access system .................... 108
Drive-Start Control (DSC) Sudden start restraint control................ 129
Driving Break-in tips ...................................................125
Correct driving posture .............................23
Driving mode select switch .................. 236
Procedures ..................................................... 124
Winter drive tips......................................... 243
Driving information display ........................ 78
Driving position memory........................... 108 Memory recall function ........................... 109
Power easy access system .................... 108
Driving range ....................................................79
Driving support system information display ...............................................................................81
DSC (Drive-Start Control) Sudden start restraint control................ 129 Dynamic radar cruise control with
full-speed range ..........................................192Warning message .................................... 200
E
Eco Driving Indicator.................................... 80
Eco Driving Indicator Light ........................ 80
EDR (Event data recorder) ............................7
Elapsed time ......................................................79
Electric Power Steering (EPS) .............. 238 Warning light .............................................. 340
Electronic key .................................................. 88 Battery-saving function............................100
If the electronic key does not operate properly ...................................................... 359
Replacing the battery ................................ 316
Emergency flashers .................................... 328
Emergency, in case of If a warning buzzer sounds................... 337
If a warning light turns on....................... 337
If a warning message is displayed .....346
If the battery is discharged ..................... 361
If the electronic key does not operate properly ...................................................... 359
If the engine will not start........................357
If the fuel filler do or cannot be opened
......................................................................... 359
If the vehicle is trapped in rising water ..........................................................................329
If you have a flat tire ..................................349
If you lose your keys ................................ 358
If you think something is wrong..........335
If your vehicle becomes stuck ............ 368
If your vehicle has to be stopped in an emergency .................................................328
If your vehicle needs to be towed ...... 331
If your vehicle overheats ....................... 365
Engine ACCESSORY mode............................... 136
Compartment..............................................295
Engine switch .................................................134
Fuel pump shut off system.....................336

424Alphabetical Index
Hood................................................................ 293
How to start the engine............................134
Identification number ............................... 373
If the engine will not start ....................... 357
If your vehicle has to be stopped in an
emergency ................................................ 328
Ignition switch (engine switch) ............. 134
Overheating.................................................365
Tachometer ............................................... 71, 72
Engine coolant Capacity ......................................................... 376
Checking .......................................................298
Preparing and checking before winter......................................................................... 243
Engine coolant temperature gauge . 71, 72
Engine immobilizer system ........................ 60
Engine oil Capacity ......................................................... 374
Checking ....................................................... 296
Preparing and checking before winter......................................................................... 243
Warning light ...............................................338
Engine oil maintenance data .................. 298
Engine oil pressure gauge .......................... 80
Engine oil temperature gauge .................. 80
Engine switch ..................................................134 Auto power off function ...........................136
Changing the engine switch modes..136
If your vehicle has to be stopped in an
emergency ................................................ 328
Enhanced Vehicle Stability Control (Enhanced VSC) ...................................... 238
Enhanced VSC (Enhanced Vehicle Stabil- ity Control) .................................................. 238
EPS (Electric Power Steering) .............. 238 Warning light ...............................................340
Event data recorder (EDR) ............................7
F
First-aid kit storage belt ............................ 268
Flat tire Tire pressure warning system ............ 305 Vehicles with a spare tire.......................349
Floor mats ...........................................................22
Fluid Automatic transmission .......................... 377
Brake ................................................................378
Washer ...........................................................302
Footwell lights ............................................... 263 Wattage ........................................................... 381
Front passenger occupant classification system .............................................................. 36
Front seats Adjustment ..................................................... 106
Cleaning .........................................................283
Correct driving posture ............................ 23
Driving position memory ........................ 108
Head restraints................................................. 111
Memory recall function............................ 109
Power easy access system .................... 108
Seat heaters ....................................................261
Seat position memory ..............................108
Seat ventilators ..............................................261
Front side marker light Light switch .................................................... 149
Replacing light bulbs ................................ 322
Front turn signal lights Replacing light bulbs .................... 322, 323
Turn signal lever ...........................................142
Wattage ........................................................... 381
Fuel Capacity ......................................................... 374
Fuel gauge ..................................................71, 72
Fuel pump shut off system.....................336
Information ....................................................382
Refueling............................................................ 161
Type .................................................................. 374
Warning light .............................................. 340
Fuel consumption Average fuel economy .............................. 79
Current fuel consumption ........................ 79
Fuel filler door If the fuel filler do or cannot be opened
......................................................................... 359

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