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................................................ 141
Cargo hooks ................................................. 283
Center Display ............................................. 258
Chains .............................................................. 254
Child-protectors............................................102
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 ............................. 131
Power window lock switch..................... 129
Power window precautions ................... 129
Rear door child-protectors ....................102
Removed electronic key battery precau- tions ............................................................... 347
Seat belt extender precautions ............. 25
Seat belt precautions ...................................42
Trunk precautions ...................................... 103
Cleaning.............................................. 306, 309 Aluminum wheels ......................................306
Exterior ...........................................................306
Interior .............................................................309
Radar sensor......................................172, 208
Seat belts........................................................309
Clock ........................................................ 76, 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 .............................................. 161 Replacing light bulbs ................................. 351
Cruise control Dynamic radar cruise control with full-
speed range ............................................... 196
Cup holder .......................................................281
Current fuel consumption .......................... 80
Curtain shield airbags .................................. 28
Customizable features ............................... 418
D
Daytime running light system ...................159
Defogger Outside rear view mirrors.....................266
Rear window ................................................266
Windshield ....................................................266
Dimension ......................................................400
Dinghy towing................................................. 142
Display BSM (Blind Spot Monitor)................... 206
Dynamic radar cruise control with full-
speed range ............................................... 196
Energy monitor ............................................. 88
Head-up display............................................84
Intuitive parking assist ............................... 215
LTA (Lane-Tracing Assist) .................... 190
Multi-information display .......................... 79
Parking Support Brake function (rear
pedestrians)............................................... 244
RCD (Rear Camera Detection) ........ 225
RCTA................................................................. 221
Warning message ..................................... 374
Distance until next engine oil change .... 78
Do-it-yourself maintenance ......................313

Alphabetical index449
Door courtesy lights ....................................277
Door lockDoors .................................................................. 99
Smart access system with push-button start ................................................................... 110
Wireless remote control........................... 97
Doors ................................................................... 99 Automatic door lock ing and unlocking
system ............................................................102
Door glasses ..................................................128
Door lock.......................................................... 99
Open door warning bu zzer .......100, 102
Outside rear view mirrors ......................125
Rear door child-protectors ....................102
Drive distance .................................................. 80
Drive info 1/Drive info 2 .............................. 80
Driver’s seat position memory .................. 118 Driving position memory .......................... 118
Memory recall function ............................. 119
Drive-start control ........................................135
Driving................................................................134 Break-in tips ...................................................135
Correct driving posture .............................23
Driving Mode Select switch ................... 212
Hybrid vehicle driving tips ......................251
Procedures ..................................................... 134
Winter drive tips......................................... 253
Driving information display ........................ 80
Driving Mode Select switch...................... 212
Driving range ................................................... 80
Driving support system information display ...............................................................................81
Dynamic radar cruise control with full- speed range..................................................196Warning message..................................... 204
E
ECB (Electronically Controlled Brake Sys- tem) .................................................................247
Eco drive mode .............................................. 212
EDR (Event data recorder) ........................... 8
Elapsed time ..................................................... 80 Electric motor (traction motor) ................ 60
Electric Power Steering (EPS)
Function .......................................................... 247
Warning light .............................................. 366
Electronically Controlled Brake System (ECB) .............................................................247
Electronic key .................................................. 96 Battery-saving function................................ 111
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 ............................................... 88
Engine ACCESSORY mode............................... 146
Compartment................................................321
Hood ................................................................. 319
How to start the hybrid system.............143
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) ..............143
Overheating.................................................395
Power switch ................................................. 143
Tachometer ..................................................... 76
Engine coolant.............................................. 323 Capacity .........................................................403
Checking ....................................................... 323
Preparing and checking before winter......................................................................... 253
Engine coolant temperature gauge ........76
Engine oil ..........................................................321 Capacity ......................................................... 402
Checking ......................................................... 321
Preparing and checking before winter......................................................................... 253
Warning light ...............................................365
Engine oil maintenance data .................. 323
EPS (Electric Power Steering) ...............247 Function .......................................................... 247
Warning light ...............................................366
EV drive mode............................................... 148
Event data recorder (EDR) ........................... 8
EV indicator ........................................................ 61
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 ......................................................... 117
Adjustment........................................................117
Cleaning.........................................................309
Correct driving posture .............................23
Driving position memory .......................... 118
Head restraints ...............................................121
Memory recall function ............................. 119 Power easy access system ...................... 118
Seat heaters .................................................. 273
Seat position memory ................................ 118
Seat ventilators ............................................ 273
Front side marker light ................................159 Light switch .................................................... 159
Front side marker lights Replacing light bulbs ..................... 351, 352
Front turn signal lights .................................154 Replacing light bulbs ..................... 351, 352
Turn signal lever .......................................... 154
Fuel ......................................................................170 Capacity .......................................................... 401
Fuel gauge ........................................................ 76
Information ....................................................407
Refueling.......................................................... 170
Type ................................................................... 401
Warning light ............................................... 367
Fuel consumption Average fuel economy ............................. 80
Current fuel consumption ....................... 80
Fuel filler door .................................................170 If the fuel filler do or cannot be opened
..........................................................................387
Refueling.......................................................... 170
Fuel gauge ..........................................................76
Fuses ................................................................. 348
G
Garage door opener ................................. 296
Gauges ................................................................76
Glove box .........................................................281
Glove box light ...............................................281
Grocery bag hooks .................................... 283
H
Hands Free Power Trunk Lid .................. 106
Headlights ........................................................159 Adaptive Front-lighting System (AFS)161
Automatic High Beam system ..............162
Light switch .................................................... 159

Alphabetical index451
Replacing light bulbs..................................351
Headlights aim .............................................. 350
Head restraints ................................................ 121
Head-up display.............................................. 84 Driving information display area........... 84
Driving support system display area .. 86
HUD (Head-up display) switch............85
Hybrid System Indicator ........................... 87
Navigation system-linked display ........ 84
Pop-up display............................................... 86
Settings .............................................................. 85
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 ......................... 63
Hill-start assist control ................................247
Hood ...................................................................319 Open .................................................................319
Hooks Cargo hooks................................................ 283
Coat hooks ................................................... 295
Grocery bag hooks ................................. 283
Retaining hooks (floor mat)......................22
Horn .................................................................... 124
HUD (Head-up display) switch................ 85
Hybrid battery (traction battery) Location............................................................. 63
Specification ................................................. 402
Warning message........................................ 66
Hybrid battery (traction battery) air vents ............................................................................. 65
Hybrid system .................................................. 60 Emergency shut off system ..................... 66
Energy monitor/consumption screen88
EV drive mode ............................................ 148
High voltage components ....................... 63
Hybrid system precautions ..................... 63 Hybrid vehicle driving tips ..................... 251
If the hybrid system will not start ....... 385
Overheating ................................................ 396
Power (ignition) switch .............................143
Regenerative braking ...................................61
Starting the hybrid system .......................143
Vehicle proximity noti
fication system. 62
Hybrid System Indicator.......................77, 87
Hybrid transmission..................................... 150 Paddle shift switches ....................... 152, 153
S mode ............................................................. 153
I
I/M test ..............................................................316
IdentificationEngine............................................................... 401
Vehicle ........................................................... 400
Ignition switch (power switch) .................143
Auto power off function........................... 146
Changing the power switch modes . 146
If your vehicle has to be stopped in an emergency ................................................ 356
Starting the hybrid system .......................143
Immobilizer system.........................................67
Indicators ............................................................73
Initialization Items to initialize ......................................... 429
Maintenance.......................................312, 323
Power windows ........................................... 128
Tire pressure warning system .............334
Inside rear view mirror ................................ 124
Instrument panel light control ................... 78
Interior lights...................................................277
Intuitive parking assist........................ 214, 215 Function ........................................................... 215
Warning message ....................................... 217
J
JackPositioning a floor jack ............................. 319
Vehicle-equipped jack ........................... 379

Alphabetical index453
Menu icons.........................................................79
MeterClock .................................................................. 76
Hybrid System Indicator ............................ 77
Indicators ...........................................................73
Instrument panel light control ................ 78
Meter control switches ..............................80
Meters ................................................................ 76
Multi-information display .......................... 79
Settings .............................................................. 82
Warning lights ............................................. 364
Warning message..................................... 374
Mirrors Inside rear view mirror.............................. 124
Outside rear view mirror defoggers266
Outside rear view mirrors ......................125
Vanity mirrors.............................................. 284
Moon roof Door lock linked moon roof operation............................................................................ 131
Jam protection function............................. 131
Operation....................................................... 130
Multi-information display .............................79
Audio system-linked display.....................81
Drive information 1/Drive information 2............................................................................80
Driving information display......................80
Driving support system information dis- play .....................................................................81
Dynamic radar cruise control with full- speed range ................................................196
Energy monitor..............................................88
LTA (Lane-Tracing Assist) .................... 190
Menu icons ...................................................... 79
Meter control switches ..............................80
Navigation system-linked display ..........81
Pop-up display............................................... 79
Settings .............................................................. 82
Suggestion function..................................... 82
Tire pressure ..................................................331
Warning message..................................... 374N
Navigation system-linked display..... 81, 84
Noise from under vehicle ...............................6
O
Odometer ......................................................... 78
Odometer and trip meter display “ODO TRIP” switch .................................... 78
Display items ................................................... 78
Pop-up display ............................................... 78
“ODO TRIP” switch ...................................... 78
Oil Engine oil........................................................402
Opener Fuel filler door ............................................... 170
Hood ................................................................. 319
Trunk ................................................................. 105
Outer foot lights Replacing light bulbs ................................. 351
Outside door handle lig hts.......................277
Outside rear view mirrors .........................125 Adjustment ..................................................... 125
BSM (Blind Spot Monitor)................... 206
Folding...............................................................126
Linked mirror functi on when reversing
............................................................................ 127
Mirror position memory ............................ 118
Outside rear view mirror defoggers266
RCTA function .............................................. 221
Outside temperature.....................................76
Overheating .................................................. 395
P
Paddle shift switches ..........................152, 153
Panic mode ........................................................97
Parking assist sensors (intuitive parking assist) ...............................................................215
Parking brake................................................. 155 Operation ....................................................... 155
Parking brake engaged warning buzzer

458Alphabetical index
Vanity mirrors ............................................... 284
Vehicle data recordings ..................................7
Vehicle identification number ................400
Vehicle Stability Control (VSC) ............247
Ventilators (seat ventilators)................... 273
VSC (Vehicle Stability Control) ............247
W
Warning buzzers
ABS ..................................................................366
Airbags ...........................................................365
Approach warning.................................... 202
Brake hold....................................................... 371
Brake Override System .........................366
Brake system ............................................... 364
Charging system .......................................365
Downshifting ....................................... 153, 154
Drive-Start Control ..................................366
Electric power steering ..........................366
Engine .............................................................365
High coolant temperature .................... 364
Hybrid system overheat........................... 371
Hybrid system .............................................365
Intuitive parking assist................. 220, 368
Low engine oil pressure.........................365
LTA (Lane Tracing Assist).........185, 368
Open door...........................................100, 102
Open hood.....................................................102
Open trunk .....................................................102
Open window ............................................... 129
PKSA (Parking Support Alert) ............. 214
PKSB (Parking Support Brake) .........369
Pre-collision braking..................................178
RCD (Rear Camera Detection) ........369
RCTA (Rear Cross Traffic Alert) ......369
Seat belt .......................................................... 367
Warning label .................................................. 63
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 ..............................................................164
Checking .......................................................325
Preparing and checking before winter..........................................................................253
Switch................................................................ 164
Washing and waxing.................................. 306
Weight Cargo capacity .............................................. 141
Load limits ........................................................ 141
Weight............................................................ 400
Wheels ............................................................. 340 Size ................................................................... 405
Window lock switch .....................................129
Windows ...........................................................128 Power windows ........................................... 128
Rear window defogger...........................266
Washer ............................................................ 164
Windshield wiper de-icer ........................ 269
Windshield wipers ........................................164 Position............................................................. 168