2020 Lexus ES300h engine overheat

3967-2. Steps to take in an emergency
engine coolant is unavailable.
6Start the hybrid system and turn the
air conditioning system on to check
that the radiator cooling fan oper-
ates and to check for coolant leaks
from the radiator or hoses.
The fan operates when the air conditioning
system is turned on immediately after a
cold start. Confirm that the fan is operating
by checking the fan sound and air flow. If it
is difficult to check these, turn the air con-
ditioning system on and off repeatedly.
(The fan may not operate in freezing tem-
peratures.)
7 If the fan is not operating:
Stop the hybrid system immediately
and contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the
nearest Lexus dealer.
If “Hybrid system overheated Out-
put power reduced” is shown on the
multi-information display
1 Stop the vehicle in a safe place.
2 Stop the hybrid system and care-
fully lift the hood. 3
After the hybrid system has cooled
down, inspect the hoses and radia-
tor core (radiato r) for any leaks.
Radiator
Cooling fan
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” and “LOW”
lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
5 Add coolant if necessary.
Water can be used in an emergency if
A
B
A
B
C

3977-2. Steps to take in an emergency
7
When trouble arises
power control unit coolant is unavailable.
6After stopping the hybrid system
and waiting for 5 minutes or more,
start the hybrid system again and
check if “Hybrid system overheated
Output power reduced” is shown
on the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact your
Lexus dealer.
If the message is not displayed:
The hybrid system temperature has
dropped and the vehicle may be driven
normally.
However, if the message appears again fre-
quently, contact your Lexus dealer.
WARNING
■When inspecting under the hood of
your vehicle
Observe the following precautions.
Failure to do so may result in serious
injury such as burns.
●If steam is seen coming from under the
hood, do not open the hood until the
steam has subsided. The engine com-
partment may be very hot.
●After the hybrid system has been
turned off, check that the “READY”
indicator are off.
When the hybrid system is operating,
the gasoline engine may automatically
start, or the cooling fan may suddenly
operate even if the gasoline engine
stops. Do not touch or approach rotat-
ing parts such as the fan, which may
lead to fingers or clothing (especially a
tie, a scarf or a muffler) getting caught,
resulting in serious injury.
●Do not loosen the coolant inlet cap or
coolant reservoir caps while the hybrid
system and radiator are hot.
High temperature steam or coolant
could spray out.
NOTICE
■When adding engine/power control
unit coolant
Add coolant slowly after the hybrid sys-
tem has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid
system.
■To prevent damage to the cooling sys-
tem
Observe the following precautions:
●Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
●Do not use any coolant additive.

448Alphabetical index
Exterior ...........................................................306
Interior .............................................................309
Seat belts........................................................309
Cargo capacity...............................................143
Cargo hooks ................................................. 283
Center Display ............................................. 258
Chains .............................................................. 255
Child-protectors........................................... 104
Child restraint system................................... 42 Fixed with a LATCH system .................. 49
Fixed with a seat belt................................... 46
Front passenger occupant classification system ..............................................................37
Points to remember .....................................42
Riding with children ......................................42
Types of child restraint system installation method ........................................................... 43
Using an anchor bracket ............................ 51
Child safety ....................................................... 42 12-volt battery precautions ....... 327, 393
Airbag precautions...................................... 33
Child restraint system................................. 43
Heated steering wheel and seat heater
precautions................................................ 273
How your child should wear the seat belt ............................................................................ 25
Moon roof precautions ............................133
Power window lock switch...................... 131
Power window precautions .................... 131
Rear door child-protectors ................... 104
Removed electronic key battery precau- tions ............................................................... 347
Seat belt extender precautions ............. 25
Seat belt precautions ...................................42
Trunk precautions ...................................... 105
Cleaning.............................................. 306, 309 Aluminum wheels ......................................306
Exterior ...........................................................306
Interior .............................................................309
Radar sensor........................................174, 210
Seat belts........................................................309
Clock ........................................................78, 284 Coat hooks..................................................... 295
Compass ......................................................... 302
Condenser ..................................................... 324
Console box ....................................................281
Console box light ..........................................281
Cooling system............................................. 323
Engine overheating.................................. 395
Hybrid system overheating ................. 396
Cornering lights .............................................163 Replacing light bulbs ................................. 351
Cruise control Dynamic radar cruise control with full-
speed range ............................................... 198
Cup holder .......................................................281
Current fuel consumption .......................... 82
Curtain shield airbags .................................. 28
Customizable features ............................... 418
D
Daytime running light system .................... 161
Defogger Outside rear view mirrors.....................266
Rear window ................................................266
Windshield ....................................................266
Dimension ......................................................400
Dinghy towing.................................................144
Display BSM (Blind Spot Monitor)................... 208
Dynamic radar cruise control with full-
speed range ............................................... 198
Energy monitor ..............................................90
Head-up display............................................86
Intuitive parking assist ................................216
LTA (Lane-Tracing Assist) .....................192
Multi-information display ........................... 81
Parking Support Brake function (rear
pedestrians)...............................................245
RCD (Rear Camera Detection) ........ 226
RCTA............................................................... 222
Warning message ..................................... 374
Distance until next engine oil change .... 80
Do-it-yourself maintenance ......................313

Alphabetical index449
Door courtesy lights ....................................277
Door lockDoors .................................................................. 101
Smart access system with push-button start ....................................................................112
Wireless remote control........................... 99
Doors ................................................................... 101 Automatic door lock ing and unlocking
system ........................................................... 104
Door glasses ................................................. 130
Door lock.......................................................... 101
Open door warning buzzer ....... 102, 104
Outside rear view mirrors ...................... 127
Rear door child-protectors ................... 104
Drive distance .................................................. 82
Drive info 1/Drive info 2 .............................. 82
Driver’s seat position memory .................120 Driving position memory .........................120
Memory recall function ..............................121
Drive-start control ........................................ 137
Driving................................................................136 Break-in tips ................................................... 137
Correct driving posture .............................23
Driving Mode Select switch ................... 213
Hybrid vehicle driving tips .................... 252
Procedures .....................................................136
Winter drive tips......................................... 254
Driving information display ........................ 82
Driving Mode Select switch......................213
Driving range ................................................... 82
Driving support system information display ............................................................................. 83
Dynamic radar cruise control with full- speed range................................................. 198Warning message.....................................206
E
ECB (Electronically Controlled Brake Sys- tem) ................................................................ 248
Eco drive mode ..............................................213
EDR (Event data recorder) ........................... 8
Elapsed time ..................................................... 82 Electric motor (traction motor) .................. 61
Electric Power Steering (EPS)
Function ..........................................................248
Warning light .............................................. 366
Electronically Controlled Brake System (ECB) ............................................................ 248
Electronic key .................................................. 98 Battery-saving function.............................. 113
If the electronic key does not operate properly ...................................................... 388
Replacing the battery ...............................346
Emergency, in case of If a warning buzzer sounds...................364
If a warning light turns on.......................364
If a warning message is displayed ..... 374
If the 12-volt battery is discharged ... 390
If the electronic key does not operate properly ...................................................... 388
If the fuel filler do or cannot be opened
..........................................................................387
If the hybrid system will not start ....... 385
If the vehicle is trapped in rising water ..........................................................................357
If you have a flat tire ..................................378
If you lose your keys .................................387
If you think something is wrong..........362
If your vehicle becomes stuck ............ 398
If your vehicle has to be stopped in an emergency ................................................ 356
If your vehicle needs to be towed .... 359
If your vehicle overheats ....................... 395
Emergency flashers .................................... 356
Energy monitor ............................................... 90
Engine ACCESSORY mode............................... 148
Compartment................................................321
Hood ................................................................. 319
How to start the hybrid system............ 145
Identification number ................................ 401
If the hybrid system will not start ....... 385
If your vehicle has to be stopped in an emergency ................................................ 356

450Alphabetical index
Ignition switch (power switch) ..............145
Overheating.................................................395
Power switch .................................................145
Tachometer ..................................................... 78
Engine coolant.............................................. 323 Capacity .........................................................403
Checking ....................................................... 323
Preparing and checking before winter......................................................................... 254
Engine coolant temperature gauge ....... 78
Engine oil ..........................................................321 Capacity ......................................................... 402
Checking ......................................................... 321
Preparing and checking before winter......................................................................... 254
Warning light ...............................................365
Engine oil maintenance data .................. 323
EPS (Electric Power Steering) .............. 248 Function .......................................................... 248
Warning light ...............................................366
EV drive mode............................................... 150
Event data recorder (EDR) ........................... 8
EV indicator ...................................................... 62
F
Flat tire ............................................................. 378 Tire pressure warning system ...............331
Floor mats ...........................................................22
Fluid Brake................................................................404
Hybrid transmission .................................404
Washer ........................................................... 325
Footwell light ..................................................277
Front passenger occupant classification system ...............................................................37
Front seats ......................................................... 119
Adjustment....................................................... 119
Cleaning.........................................................309
Correct driving posture .............................23
Driving position memory .........................120
Head restraints ............................................. 123
Memory recall function ..............................121 Power easy access system .................... 120
Seat heaters .................................................. 273
Seat position memory .............................. 120
Seat ventilators ............................................ 273
Front side marker light ................................. 161 Light switch ...................................................... 161
Front side marker lights Replacing light bulbs ..................... 351, 352
Front turn signal lights .................................156 Replacing light bulbs ..................... 351, 352
Turn signal lever .......................................... 156
Fuel ...................................................................... 172 Capacity .......................................................... 401
Fuel gauge ........................................................ 78
Information ....................................................407
Refueling........................................................... 172
Type ................................................................... 401
Warning light ............................................... 367
Fuel consumption Average fuel economy .............................. 82
Current fuel consumption ........................ 82
Fuel filler door ................................................. 172 If the fuel filler do or cannot be opened
..........................................................................387
Refueling........................................................... 172
Fuel gauge ......................................................... 78
Fuses ................................................................. 348
G
Garage door opener ................................. 296
Gauges ............................................................... 78
Glove box .........................................................281
Glove box light ...............................................281
Grocery bag hooks .................................... 283
H
Hands Free Power Trunk Lid .................. 108
Headlights ......................................................... 161 Adaptive Front-lighting System (AFS)........................................................................... 163
Automatic High Beam system ............. 164

Alphabetical index451
Light switch ...................................................... 161
Replacing light bulbs..................................351
Headlights aim .............................................. 350
Head restraints ...............................................123
Head-up display.............................................. 86 Driving information display area........... 86
Driving support system display area ..88
HUD (Head-up display) switch............ 87
Hybrid System Indicator ........................... 89
Navigation system-linked display ........ 86
Pop-up display...............................................88
Settings .............................................................. 87
Heated steering wheel .............................. 273
Heaters Air conditioning system.......................... 265
Heated steering wheel............................ 273
Outside rear view mirrors .................... 266
Seat heaters .................................................. 273
High mounted stoplight Replacing light bulbs..................................351
High-voltage components ......................... 64
Hill-start assist control ............................... 248
Hood ...................................................................319
Open .................................................................319
Hooks Cargo hooks................................................ 283
Coat hooks ................................................... 295
Grocery bag hooks ................................. 283
Retaining hooks (floor mat)......................22
Horn .................................................................... 126
HUD (Head-up display) switch................ 87
Hybrid battery (traction battery) Location............................................................. 64
Specification ................................................. 402
Warning message........................................ 67
Hybrid battery (traction battery) air vents ............................................................................. 66
Hybrid system .................................................... 61 Emergency shut off system ..................... 67
Energy monitor/consumption screen90
EV drive mode ............................................ 150
High voltage components ....................... 64 Hybrid system precautions...................... 64
Hybrid vehicle driving tips .................... 252
If the hybrid system will not start ....... 385
Overheating ................................................ 396
Power (ignition) switch ............................ 145
Regenerative braking ................................. 62
Starting the hybrid system ...................... 145
Vehicle proximity noti
fication system. 63
Hybrid System Indicator...................... 79, 89
Hybrid transmission......................................152 Paddle shift switches .......................154, 155
S mode ............................................................. 155
I
I/M test ..............................................................316
IdentificationEngine............................................................... 401
Vehicle ........................................................... 400
Ignition switch (power switch) .................145 Auto power off function........................... 148
Changing the power switch modes . 148
If your vehicle has to be stopped in an emergency ................................................ 356
Starting the hybrid system ...................... 145
Immobilizer system........................................ 68
Indicators ........................................................... 75
Initialization Items to initialize ......................................... 429
Maintenance.......................................312, 323
Power windows ........................................... 130
Tire pressure warning system .............334
Inside rear view mirror ................................126
Instrument panel light control ................... 80
Interior lights...................................................277
Intuitive parking assist........................215, 216 Function ............................................................216
Warning message ...................................... 218
J
JackPositioning a floor jack ............................. 319

Alphabetical index453
Master warning light .................................... 371
Menu icons..........................................................81
MeterClock .................................................................. 78
Hybrid System Indicator ........................... 79
Indicators .......................................................... 75
Instrument panel light control ................80
Meter control switches .............................. 82
Meters ................................................................ 78
Multi-information display ............................81
Settings .............................................................. 84
Warning lights ............................................. 364
Warning message..................................... 374
Mirrors Inside rear view mirror.............................. 126
Outside rear view mirror defoggers266
Outside rear view mirrors ...................... 127
Vanity mirrors.............................................. 284
Moon roof Door lock linked moon roof operation...........................................................................133
Jam protection function............................133
Operation........................................................ 132
Multi-information display ..............................81 Audio system-linked display................... 83
Drive information 1/Drive information 2............................................................................ 82
Driving information display...................... 82
Driving support system information dis- play ................................................................... 83
Dynamic radar cruise control with full- speed range ............................................... 198
Energy monitor.............................................. 90
LTA (Lane-Tracing Assist) ..................... 192
Menu icons ........................................................81
Meter control switches .............................. 82
Navigation system-linked display ........ 83
Pop-up display.................................................81
Settings .............................................................. 84
Suggestion function..................................... 84
Tire pressure ..................................................331
Warning message..................................... 374N
Navigation system-linked display... 83, 86
Noise from under vehicle ...............................6
O
Odometer ......................................................... 80
Odometer and trip meter display “ODO TRIP” switch ................................... 80
Display items .................................................. 80
Pop-up display .............................................. 80
“ODO TRIP” switch ...................................... 80
Oil Engine oil........................................................402
Opener Fuel filler door ................................................ 172
Hood ................................................................. 319
Trunk ................................................................. 107
Outer foot lights Replacing light bulbs ................................. 351
Outside door handle lig hts.......................277
Outside rear view mirrors ......................... 127 Adjustment ...................................................... 127
BSM (Blind Spot Monitor)................... 208
Folding.............................................................. 128
Linked mirror functi on when reversing
............................................................................129
Mirror position memory .......................... 120
Outside rear view mirror defoggers266
RCTA function ............................................ 222
Outside temperature.................................... 78
Overheating .................................................. 395
P
Paddle shift switches ......................... 154, 155
Panic mode ....................................................... 99
Parking assist sensors (intuitive parking assist) ...............................................................216
Parking brake.................................................. 157 Operation ........................................................157
Parking brake engaged warning buzzer

458Alphabetical index
Vanity mirrors ............................................... 284
Vehicle data recordings ..................................7
Vehicle identification number ................400
Vehicle Stability Control (VSC) ........... 248
Ventilators (seat ventilators)................... 273
VSC (Vehicle Stability Control) ........... 248
W
Warning buzzers
ABS ..................................................................366
Airbags ...........................................................365
Approach warning.................................... 204
Brake hold....................................................... 371
Brake Override System .........................366
Brake system ............................................... 364
Charging system .......................................365
Downshifting .......................................155, 156
Drive-Start Control ..................................366
Electric power steering ..........................366
Engine .............................................................365
High coolant temperature .................... 364
Hybrid system overheat........................... 371
Hybrid system .............................................365
Intuitive parking assist....................221, 368
Low engine oil pressure.........................365
LTA (Lane Tracing Assist)......... 187, 368
Open door........................................... 102, 104
Open hood.................................................... 104
Open trunk .................................................... 104
Open window ................................................ 131
PKSA (Parking Support Alert) .............215
PKSB (Parking Support Brake) .........369
Pre-collision braking................................. 180
RCD (Rear Camera Detection) ........369
RCTA (Rear Cross Traffic Alert) ......369
Seat belt .......................................................... 367
Warning label .................................................. 64
Warning lights............................................... 364 ABS ..................................................................366
Brake hold operated indicator ............. 371
Brake Override System .........................366
Brake system ............................................... 364 Charging system....................................... 365
Drive-Start Control.................................. 366
Electric power steering.......................... 366
High coolant temperature.....................364
Hybrid system overheat ...........................371
Intuitive parking assist OFF indicator
......................................................................... 368
Low engine oil pressure........................ 365
Low fuel level ............................................... 367
LTA indicator .............................................. 368
Malfunction indicator lamp .................. 365
Master warning light...................................371
Parking brake indicator ..........................370
PKSB OFF indicator ............................... 369
Pre-collision system..................................370
RCD OFF indicator................................. 369
RCTA OFF indicator .............................. 369
Seat belt reminder light........................... 367
Slip indicator .................................................370
SRS ................................................................... 365
Tire pressure ............................................... 368
Warning messages ..................................... 374
Washer ..............................................................166
Checking .......................................................325
Preparing and checking before winter..........................................................................254
Switch................................................................ 166
Washing and waxing.................................. 306
Weight Cargo capacity .............................................143
Load limits .......................................................143
Weight............................................................ 400
Wheels ............................................................. 340 Size ................................................................... 405
Window lock switch ...................................... 131
Windows .......................................................... 130 Power windows ........................................... 130
Rear window defogger...........................266
Washer ............................................................ 166
Windshield wiper de-icer ........................ 269
Windshield wipers ........................................166 Position............................................................. 170