2019 LEXUS GS300H overheating

4747-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)
(If equipped)
Indicates that steering control function is temporarily canceled due to the LKA (L ane-Keeping Assist) system determining that the driver does not have their hands on
the steering wheel while the steering control function is onA buzzer also sounds.
 Firmly hold the steering wheel.
Indicates that the parking brake system is overheating A buzzer also sounds.
 Do not use the parking brake until the message dis- appears.
Indicates an engine malfunction
A buzzer also sounds.  Have the vehicle inspected by any authorized Lexus retailer or Lexus authorized repairer, or any reliable
repairer.
Indicates an engine malfunction A buzzer also sounds. Have the vehicle inspected by any authorized Lexus
retailer or Lexus authorized repairer, or any reliable repairer.
Warning messageDetails/Actions

535
7
7-2. Steps to take in an emergency
When trouble arises
GS450h_300h_OM_OM30F92E_(EE)
If your vehicle overheats
●The needle of the engine coolant temperature gauge ( P. 104) enters the
red zone or a loss of hybrid system power is experienced. (For example, the
vehicle speed does not increase.)
●“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” or
“Hybrid System Overheated Reduced Output Power” ( P. 466) is shown on
the multi-information display.
●Steam comes out from under the hood.
■If the needle of the engine coolant temperature gauge enters the red zone
or “Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display
Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has cooled down sufficiently, inspect the hoses and
cooling system for leaks.
Radiator
Cooling fans
If a large amount of coolant leaks, immediately contact any autho-
rized Lexus retailer or Lexus authorized repairer, or any reli-able repairer.
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

584Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Cargo hooks........................................... 374
CD player*
Chains ....................................................... 336
Child restraint system ............................ 57
Baby seats, definition ..........................58
Baby seats, installation ....................... 67
Child seats, definition..........................58
Child seats, installation....................... 67
Installing CRS with ISOFIX
rigid anchors........................................ 70
Installing CRS with seat belts.......... 67
Installing CRS with top strap ............ 71
Junior seats, definition ........................58
Junior seats, installation ..................... 69
Child safety................................................. 56
12-volt battery
precautions............................. 414, 534
Airbag precautions .............................. 45
Child restraint system......................... 57
How your child should
wear the seat belt ..................... 39, 40
Installing child restraints .................... 66
Moon roof precautions ................... 198
Power window lock switch.............193
Power window precautions .......... 195
Rear door child-protectors ............143
Removed electronic key
battery precautions ....................... 436
Seat belt comfort guide ..................... 39
Seat belt precautions .......................... 42
Seat heater precautions ...................361
Trunk precautions ..............................149
Child-protectors ................................... 143
Cleaning....................................... 390, 394
Aluminum wheels................................ 391
Exterior ................................................... 390
Interior..................................................... 394
Seat belts ............................................... 395
Clock ............................................... 105, 378
Coat hooks.............................................. 382
Condenser ................................................ 411
Console box ........................................... 370
Console box light ................................... 371
Coolant..................................................... 409
Capacity................................................. 552
Checking ............................................... 409
Preparing and checking
before winter.................................... 334
Cooling system ..................................... 409
Engine overheating .......................... 535
Hybrid system overheating.......... 535
Consumption screen ........................... 126
Cruise control
Cruise control .....................................308
Dynamic radar cruise control
with full-speed range ................... 296
Cup holders .............................................. 371
Curtain shield airbags .......................... 43
Customizable features.........................561

586Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Dynamic radar cruise control
with full-speed range ....................... 296
Function .................................................. 296
Warning message.............................466
Dynamic Rear Steering (DRS)........ 325
Function .................................................. 325
Warning message.............................466
DVD player*
Eco drive mode ........................................ 311
Electric motor (traction motor) ......... 76
Electric Power Steering (EPS)........ 325
Function .................................................. 325
Warning light .........................................461
Warning message.............................466
Electronic key.......................................... 134
Battery-saving function.................... 155
If the electronic key does not
operate properly ............................ 527
Replacing the battery.......................435
Emergency, in case of
If a warning buzzer sounds ......... 460
If a warning light turns on.............. 460
If a warning message is
displayed ............................................466
If the 12-volt battery is
discharged........................................ 530
If the electronic key does not
operate properly ............................ 527
If the hybrid system will not
start ........................................................ 523
If the parking brake cannot
be released........................................525
If you have a flat tire .............498, 509
If you think something
is wrong .............................................. 459
If your vehicle becomes
stuck ..................................................... 542
If your vehicle has to be
stopped in an emergency ......... 453
If your vehicle needs to
be towed ............................................ 454
If your vehicle overheats................ 535
Emergency brake signal.................... 325
Emergency flashers............................. 452
Emergency tire puncture
repair kit ................................................ 509
Energy monitor ....................................... 126
Engine ....................................................... 548
Accessory mode ................................. 218
Compartment ..................................... 403
Engine switch ........................................ 217
Hood ......................................................... 401
How to start the hybrid
system.................................................... 217
Identification number....................... 548
Ignition switch
(power switch) .................................. 217
Overheating ........................................ 535
Power switch ......................................... 217
Engine compartment cover ............. 405
Engine coolant....................................... 409
Capacity................................................. 552
Checking ............................................... 409
Preparing and checking
before winter.................................... 334
E

589Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Hooks
Cargo hooks........................................ 374
Coat hooks ...........................................382
Luggage hook..................................... 374
Retaining hooks (floor mat)............. 34
Horn ............................................................ 186
Hybrid battery (traction battery)
Location.....................................................80
Specification .........................................549
Hybrid battery (traction battery)
air vents...................................................... 81
Hybrid system ........................................... 76
Emergency shut off system................81
Energy monitor/
consumption screen.......................126
EV drive mode ................................... 222
High voltage components ...............80
Hybrid System Indicator ................. 108
Hybrid system precautions..............80
Hybrid vehicle driving tips ..............331
If the hybrid system
will not start ....................................... 523
Overheating .........................................535
Power (ignition) switch ..................... 217
Regenerative braking ......................... 78
Starting the hybrid system............... 217
Hybrid System Indicator ..................... 108
Hybrid transmission............................. 224
If the shift lever cannot be
shifted from P ................................... 229
Paddle shift switches ........................ 226
S mode.....................................................227
Identification ........................................... 547
Engine ..................................................... 548
Vehicle.................................................... 547
Ignition switch (power switch) .......... 217
Auto power off function ................... 219
Changing the power switch
modes.................................................... 218
If your vehicle has to be
stopped in an emergency ......... 453
Starting the hybrid system .............. 217
Illuminated entry system .................... 368
Immobilizer system................................. 85
Indicators .................................................... 101
Initialization
Items to initialize ................................. 576
Moon roof ............................................... 197
Power windows ................................... 194
Tire pressure warning
system.................................................... 418
Initiators (tire pressure warning
system)....................................................427
Inside door handle lights ................... 366
Inside rear view mirror ........................ 188
Instrument panel light control ...........107
Interior lights........................................... 366
Intrusion sensor and tilt sensor .......... 94
ISOFIX rigid anchors ............................ 66
I
*: Refer to the “NAVIGATION AND MULTIMEDIA
SYSTEM OWNER’S MANUAL”.

592Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Multi-information display ...................... 111
Audio system-linked ............................. 111
Drive information .................................. 113
Dynamic radar cruise control
with full-speed range.................... 296
G-force...................................................... 114
LKA (Lane-Keeping Assist) ......... 282
Navigation system-linked................... 111
Settings....................................................... 115
Switch settings........................................ 115
Switching the display ...........................112
nanoe  system ..................................... 356
Navigation system*
Odometer................................................. 105
Oil
Differential oil .......................................554
Engine oil .............................................. 550
Opener
Fuel filler door...................................... 257
Hood ......................................................... 401
Trunk ..........................................................146
Outer foot lights
Location..................................................366
Replacing light bulbs........................ 445
Wattage................................................. 558
Outside rear view mirrors ................. 190
Adjusting and folding ........................190
BSM (Blind Spot Monitor) ............. 314
Linked mirror function
when reversing ...................................191
Mirror position memory .................. 178
Outside rear view mirror
defoggers ......................................... 352
Outside temperature display ........... 105
Overheating ........................................... 535
Paddle shift switches ........................... 226
Parking assist sensors*
Parking brake......................................... 232
If the parking brake cannot
be released ....................................... 525
Operation ..............................................232
Parking brake engaged
warning buzzer............................... 466
Parking brake engaged
warning message .......................... 466
PCS
(Pre-Crash Safety system)............ 270
Function.................................................. 270
Warning light......................................... 461
Warning message ............................ 466
Personal lights........................................ 367
Pollen removal mode.......................... 352
Power control unit .................................. 80
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