2019 LEXUS LS500H engine overheat

4367-2. Steps to take in an emergency
LS500h_OM_(U)_1809
In some situations, the master warning light and warning buzzer may not oper-
ate as specified. In this case, follow the instructions displayed in the warning
message.
 If a warning light comes on or flashes at the same time that a warning message is
displayed, take corrective actio n according to the warning light. ( P.424)
*: A buzzer sounds the first time a message is shown on the multi-information display.
■Warning messages
The warning messages explained below
may differ from the actual messages
according to operation conditions and vehi-
cle specifications.
■Warning buzzer
In some cases, the bu zzer may not be heard
due to being in a noisy location or audio
sound.
■If “Engine Oil Level Low Add or
Replace” is displayed
The engine oil level is low. Check the level
of the engine oil, and add if necessary.
This message may appear if the vehicle is
stopped on a slope. Move the vehicle to a
level surface and check to see if the mes-
sage disappears.
■If “Hybrid System Stopped Steering
Power Low” is displayed
This message is displayed if the hybrid sys-
tem is stopped while driving.
When steering wheel operations are
heavier than usual, grip the steering wheel
firmly and operate it using more force than
usual.
■If “Hybrid System Overheated Output
Power Reduced” is displayed
This message may be displayed when driv-
ing under severe operat ing conditions. (For
example, when driving up a long steep hill.)
Handling method:  P.450
■If “Warming Up Maximum Vehicle
Speed: 65 MPH” is displayed
The transmission is being warmed up and
the vehicle is unable to be driven over 65
mph (110 km/h). Wait until the transmission
warms up.
■If “Stop the Vehicle in a Safe Place Shift
to P position” is displayed
There may be a malfunction in the hybrid
system or the shift position may be shifted to
N for a long time. I mmediately stop the
vehicle and contact your Lexus dealer.
■If “Traction Battery Needs to be Pro-
tected Refrain From the Use of N Posi-
tion” is displayed
This message may be displayed when the
shift position is in N.
As the hybrid battery (traction battery) can-
not be charged when the shift position is in
N, shift the shift positi on to P when the vehi-
cle is stopped.
Comes onDoes not sound
Indicates a condition, such as malfunction of electri-
cal components, their cond ition, or indicates the
need for maintenance
FlashesDoes not sound
Indicates a situation, such as when an operation has
been performed incorrectly, or indicates how to
perform an operation correctly
Warning buzzer*Warning

4507-2. Steps to take in an emergency
LS500h_OM_(U)_1809
If 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
1 Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the hybrid system.
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 hybrid system has cooled
down sufficiently, inspect the hoses
NOTICE
■When handling jumper cables
When connecting the jumper cables,
ensure that they do not become entan-
gled in the cooling fan or engine drive
belt.
■To prevent damaging the vehicle
The exclusive jump starting terminal is to
be used when charging the 12-volt bat-
tery from another ve hicle in an emer-
gency. It cannot be used to jump start
another vehicle.
If your vehicle overheats
The following may indicate that
your vehicle is overheating.
 The engine coolant temperature
gauge ( P.81, 85) is in the red
zone or a loss of hybrid system
power is experienced. (For exam-
ple, the vehicle speed does not
increase.)
 “Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” or “Hybrid System
Overheated Output Power
Reduced” is shown on the
multi-information display.
 Steam comes out from under the
hood.
Correction procedures

510Alphabetical Index
LS500h_OM_(U)_1809
Buzzer Hands off steering wheel alert (LTA)............................................................. 244, 244
C
Card key .......................................................... 108
Care Aluminum wheels ......................................368
Exterior ...........................................................368
Interior ............................................................... 371
Seat belts.......................................................... 371
Cargo capacity.............................................. 168
Cargo net ....................................................... 350
Center Display ...............................................316
Chains ............................................................... 310
Child restraint system Fixed with a LATCH system .................. 53
Fixed with a seat belt................................... 49
Front passenger occupant classification system ............................................................. 40
Points to remember .................................... 45
Riding with children ..................................... 45
Types of child restraint system installation method ........................................................... 46
Using an anchor bracket .......................... 55
Child safety 12-volt battery precautions ........ 391, 449
Airbag precautions...................................... 34
Child restraint system................................. 46
Heated steering wheel and seat heater precautions................................................ 337
How your child should wear the seat belt ............................................................................ 25
Moon roof precautions ............................ 157
Power window lock switch.................... 156
Power window precautions .................. 155
Rear door child-protectors ..................... 115
Removed electronic key battery precau- tions ................................................................ 410
Seat belt extender precautions ............. 25
Seat belt precautions .................................. 45
Trunk precautions ........................................ 116 Child-protectors............................................. 115
Cleaning
Aluminum wheels ..................................... 368
Exterior........................................................... 368
Interior ...............................................................371
Radar sensor ................................... 200, 206
Seat belts ..........................................................371
Clock ................................................ 81, 85, 355
Clock light ........................................................341
Coat hooks..................................................... 354
Coin holder .................................................... 347
Condenser .....................................................388
Console box .................................................. 348
Cooling system............................................. 387 Engine overheating.................................. 450
Hybrid system overheating ................... 451
Cornering lights ............................................ 189
Cruise control Dynamic radar cruise control with full-speed range ......................... 245, 255
Cup holders ................................................... 347
Current fuel consumption .......................... 92
Curtain shield airbags .................................. 29
Customizable features .............................. 479
D
Daytime running light system ...................187
Defogger Outside rear view mirrors..................... 324
Rear window ................................................ 324
Windshield .................................................... 324
Differential Front differential oil............. .......................463
Rear differential oil......... ..................... .......463
Dimension ...................................................... 458
Dinghy towing.................................................169
Display Center Display ............................................. 316
Dynamic radar cruise control with full-speed range ......................................245
Energy monitor ............................................ 100
Head-up display............................................ 96

512Alphabetical Index
LS500h_OM_(U)_1809
If you have a flat tire .................................. 439
If you lose your keys................................. 442
If you think something is wrong ......... 423
If your vehicle becomes stuck............. 454
If your vehicle has to be stopped in an
emergency ..................................................416
If your vehicle needs to be towed .......419
If your vehicle overheats ........................450
Energy monitor .................................... 100, 101
Engine ACCESSORY mode ............................... 172
Compartment .............................................384
Engine compartment cover ................ 385
Engine switch.................................................170
Hood................................................................ 382
How to start the hybrid system ............170
Identification number ...............................459
If the hybrid system will not start ........440
If your vehicle has to be stopped in an
emergency ..................................................416
Ignition switch (power switch) ..............170
Overheating.................................................450
Power switch .................................................170
Tachometer ............................................. 81, 85
Engine compartment cover ....................385
Engine coolant Capacity ...........................................................461
Checking ....................................................... 387
Preparing and checking before winter.........................................................................309
Engine coolant temperature gauge 81, 85
Engine oil Capacity .........................................................460
Checking ...................................................... 385
Preparing and checking before winter.........................................................................309
Warning light ............................................... 425
Engine oil maintenance data .................. 387
Engine switch (power switch) ..................170 If your vehicle has to be stopped in an
emergency ..................................................416 EPS (Electric Power Steering) .............. 302
Warning light ............................................... 427
EV drive mode................................................ 174
EV indicator ...................................................... 64
Event data recorder (E DR) ........................... 8
F
FCTA (Front Cross Traffic Alert) ......... 230
First-aid kit storage belt ..............................351
Flat tire
Tire pressure warning system .............394
Floor mats ...........................................................22
Fluid Brake ................................................................463
Hybrid transmission.................................. 462
Washer .......................................................... 389
Footwell light ...................................................341
Front automatic air conditioning system .......................................................................... 323
Front Cross Traffic Alert (FCTA) ......... 230
Front passenger occupant classification system .............................................................. 40
Front seats Adjustment ....................................................... 131
Cleaning ...........................................................371
Correct driving posture ............................ 23
Driving position memory .........................142
Head restraints..............................................147
Memory recall function............................ 145
Power easy access system .....................142
Refresh system ............................................. 136
Seat heaters .................................................. 337
Seat position memory ...............................142
Seat ventilators ............................................ 337
Front side marker light Light switch .................................................... 187
Replacing light bulbs ..................................414
Front turn signal lights Replacing light bulbs ..................................414
Turn signal lever .......................................... 182
Fuel Capacity ........................................................ 459

516Alphabetical Index
LS500h_OM_(U)_1809
Dynamic radar cruise control with full-speed range ...................................... 245
Energy monitor.............................................. 101
Gear Position ................................................. 93
G-force.............................................................. 93
LTA (Lane Tracing Assist).................... 239
Menu icons ...................................................... 90
Meter control switches ................................ 91
Navigation system-linked display ........ 93
Pop-up display............................................... 90
Settings .............................................................. 94
Suggestion function..................................... 95
Tire pressure ................................................ 394
Units .................................................................... 93
Warning message..................................... 434
N
Navigation system-linked display.... 93, 96
Noise from under vehicle ...............................6
O
“ODO TRIP” switch ............................. 83, 89
Odometer ................................................ 83, 88
Odometer and trip meter display Display items ......................................... 83, 88
“ODO TRIP” switch ...........................83, 89
Pop-up display......................................83, 89
Oil Engine oil .......................................................460
Front differential oil ................................... 463
Rear differential oil .................................... 463
Opener Fuel filler door................................................ 197
Hood................................................................ 382
Trunk ................................................................... 118
Outer foot lights Location............................................................ 341
Outside door handle lights........................341
Outside rear view mirrors Adjustment......................................................152
BSM (Blind Sport Monitor) .................258 Folding.............................................................. 153
Linked mirror functi
on when reversing
........................................................................... 152
Mirror position memory ...........................142
Outside rear view mirror defoggers324
RCTA function .............................................. 271
Outside temperature............................. 81, 85
Overheating .................................................. 450
P
Paddle shift switches .......................... 180, 181
Panic mode ....................................................... 110
Parking assist sensors (intuitive parking assist) ............................................................. 265
Parking brake Operation ....................................................... 183
Parking brake engaged warning buzzer........................................................................... 184
Warning light .................................................431
Warning message ...................................... 184
Parking lights Light switch .................................................... 187
Replacing light bulbs ..................................414
Parking Support Brake function (for rear-crossing vehicles) .......................... 290Function ......................................................... 290
Parking Support Brake function (rear pedestrians) ..................................... 278, 294Function .......................................................... 294
Parking Support Brake function (rear-crossing vehicles)......................... 278
Parking Support Brake function (static objects) ..............................................278, 284Function ..........................................................284
PCS (Pre-Collision System) Function ................................................ 212, 223
PCS OFF switch ..............................215, 225
Warning light .............................................. 430
Personal lights.................................................341
PKSA (Parking Support Alert) .............. 263
PKSB (Parking Support Brake)............. 278 Warning message .....................................282

5211-1. What to do if... (Troubleshooting)
LS500h_OM_(U)_1809521Alphabetical Index
U
USB charging ports.................................... 353
V
Vanity lights.................................................... 357
Vanity mirrors ............................................... 357
Variable Gear Ratio Steering (VGRS)302
VDIM (Vehicle Dynami cs Integrated Man-
agement)...................................................... 303
Vehicle data recordings ..................................7
Vehicle Dynamics Integrated Manage- ment (VDIM).............................................. 303
Vehicle identification number ................ 458
Vehicle Stability Control (VSC) ........... 302
Ventilators (seat ventilators)................... 337
VGRS (Variable Gear Ratio Steering)302
VSC (Vehicle Stabilit y Control) ........... 302
W
Warning buzzer
Hands off steering wheel alert (LTA)244
LTA (Lane-Tracing Assist) ................... 236
Warning buzzers ABS .................................................................. 426
Airbags ........................................................... 426
Approach warning......................................251
Brake hold....................................................... 431
Brake Override System ......................... 427
Brake system ............................................... 424
Charging system ....................................... 425
Downshifting ................................................... 181
Drive-Start Control .................................. 427
Electric power steering .......................... 427
Engine ............................................................. 426
High coolant temperature .................... 424
Hybrid system ............................................. 426
Intuitive parking assist.................. 270, 429
Low engine oil pressure......................... 425
LTA (Lane Tracing Assi st)........ 233, 429
Open door...............................................113, 115 Open window .............................................. 155
PKSA (Parking Support Alert) ........... 264
PKSB (Parking Support Brake) ........ 430
Pop Up Hood.............................................. 426
Pre-collision braking ...................... 212, 224
RCD (Rear Camera Detection) ........ 429
RCTA (Rear Cross Tra
ffic Alert) ...... 429
Seat belt .............................................. 427, 428
Warning label .................................................. 66
Warning lights............................................... 424 ABS ................................................................... 426
Brake hold operated indicator .............431
Brake Override System ......................... 427
Brake system................................................ 424
Charging system........................................425
Drive-Start Control................................... 427
Electric power steering........................... 427
High coolant temperature..................... 424
Hybrid system overheat warning light..........................................................................425
Intuitive parking assist OFF indicator429
Low engine oil pressure.........................425
Low fuel level ............................................... 427
Low traction battery warning light ....425
LTA indicator ............................................... 429
Malfunction indicator lamp ................... 426
Master warning light...................................431
Parking brake indicator ............................431
PKSB OFF indicator ............................... 430
Pop Up Hood.............................................. 426
Pre-collision system................................. 430
RCD OFF indicator.................................. 429
RCTA OFF indicator ............................... 429
Seat belt reminder light............... 427, 428
Slip indicator ................................................ 430
SRS .................................................................... 426
Tire pressure ................................................428
Warning messages ..................................... 434
Warning reflector storage belt................351
Washer Adding............................................................ 389