2018 LEXUS LS500 engine overheat

172 4-2. Driving procedures
LS500_OM_OM50F54U_(U) this happens, refrain from operating the
parking brake. Normal operation will return
after about 1 minute. ■
If “EPB Activation Stopped Incom-
pletely” or “EPB unavailable” is dis-
played on the multi-information display
Operate the parking brake switch. If the
message does not disappear after operat-
ing the switch several times, the system may
be malfunctioning. Have the vehicle
inspected by your Lexus dealer. ■
Parking brake operation sound
When the parking brake operates, a motor
sound (whirring sound) may be heard. This
does not indicate a malfunction. ■
Parking brake operation●
Depending on the engine switch mode,
the parking brake indi cator light will turn
on and stay on as described below:
IGNITION ON mode: Comes on until
the parking brake is released.
Not in IGNITION ON mode: Stays on
for approximately 15 seconds. ●
When the engine switch is turned off with
the parking brake set, the parking brake
indicator light will stay on for about 15
seconds. This does not indicate a mal-
function.■
When the parking brake switch mal-
functions
Automatic mode (automatic brake setting
and releasing) will be turned on automati-
cally. ■
Parking the vehicle
→ P.150
■
Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven
with the parking brake engaged. “EPB
Applied” is displayed on the multi-informa-
tion display. (with the vehicle reached a
speed of 3 mph [5 km/h])
■
If the brake system warning light comes
on
→ P.418
■
Usage in winter time
→ P.299 WARNING■
When parking the vehicle
Do not leave a child in the vehicle alone.
The parking brake may be released unin-
tentionally and there is the danger of the
vehicle moving that may lead to an acci-
dent resulting in death or serious injury.
NOTICE■
When parking the vehicle
Before you leave the vehicle, set the
parking brake, shift the shift position to P
and make sure that the vehicle does not
move. ■
When the system malfunctions
Stop the vehicle in a safe place and
check the warning messages. ■
When the parking brake cannot be
released due to a malfunction
Driving the vehicle with the parking
brake set will lead to brake components
overheating, which may affect braking
performance and increase brake wear.
Have the vehicle inspected by your
Lexus dealer immediately if this occurs.

3295-3. Using the air conditio ning system and defogger
LS500_OM_OM50F54U_(U) 5
Interior features Enables/Disables the automatic
mode of the rear seat heaters
Decreases the rear seat heater
temperature levelIf this switch is select ed when the rear seat
heater temperature level is set to Lo, the
rear seat heater will turn off. ■
The heated steering wheel, seat heaters
and seat ventilators wheel can be used
when
The engine switch is in IGNITION ON
mode. ■
Air conditioning system-linked control
mode
When the seat ventilato r fan speed level is
Hi, the seat ventilator fan speed becomes
higher according to the fan speed of the air
conditioning system. ■
Customization
Some functions can be customized.
( → P.468)
WARNING■
To prevent overheating and minor
burn injuries
Observe the following precautions when
using the seat heaters. ●
Do not cover the seat with a blanket or
cushion when using the seat heater.
●
Do not use seat heater more than nec-
essary. B
C

409
LS500_OM_OM50F54U_(U) 7 7
When trouble arises When trouble arises .
7-1. Essential information
Emergency flashers................... 410
If your vehicle has to be stopped in
an emergency ........................... 410
7-2. Steps to take in an emergency
If your vehicle needs to be towed
......................................................... 412
If you think something is wrong
......................................................... 416
Fuel pump shut off system ...... 417
If a warning light turns on or a
warning buzzer sounds ........ 418
If a warning message is displayed
........................................................ 428
If you have a flat tire.................. 432
If the engine wi ll not start ....... 433
If you lose your keys ................. 435
If the fuel filler door cannot be
opened........................................ 435
If the electronic key does not
operate properly .................... 436
If the vehicle battery is discharged
........................................................ 438
If your vehicle overheats ........ 443
If the vehicle becomes stuck
........................................................ 446

4437-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) 7
When trouble arises
1 Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the engine.
2 If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the engine has cooled down
sufficiently, inspect the hoses and radiator core (radiator) for any
leaks.
Radiators
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 “F” and “L” lines on
the reservoir.
 Engine
Reservoir
“F” line
“L” line
Coolant inlet cap
 IntercoolerIf your vehicle overheats The following may indicate that
your vehicle is overheating.
 The engine coolant temperature
gauge ( → P.69, 72) is in the red
zone or a loss of engine power is
experienced. (For example, the
vehicle speed does not increase.)
 “Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” is shown on the
multi-information display.
 Steam comes out from under the
hood.
Correction procedures A
B
A
B
C
D

498 Alphabetical Index
LS500_OM_OM50F54U_(U) Brightness control
Instrument panel light control ..........71, 75
BSM (Blind Spot Monitor).........................251 C
Card key ............................................................ 92
Care
Aluminum wheels ...................................... 362
Exterior ........................................................... 362
Interior .............................................................365
Seat belts........................................................365
Cargo capacity.............................................. 158
Cargo net ....................................................... 339
Center Display ............................................. 306
Chains ..............................................................300
Child restraint system
Fixed with a LATCH system .................. 53
Fixed with a seat belt................................... 49
Front passenger occupa nt 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
Airbag precautions...................................... 34
Battery precautions ......................385, 442
Child restraint system................................. 46
Heated steering wheel and seat heater
precautions................................................ 326
How your child should wear the seat belt
............................................................................ 25
Moon roof precautions ............................143
Panoramic moon roof precautions .... 147
Power window lock switch.......................141
Power window precautions .................. 140
Rear door child-protectors ..................... 99
Removed electronic key battery precau-
tions ...............................................................404
Seat belt extender precautions ............. 25
Seat belt precautions .................................. 45 Trunk precautions.......................................100
Child-protectors............................................. 99
Cleaning
Aluminum wheels ......................................362
Exterior............................................................362
Interior ............................................................ 365
Radar sensor .............................. 190, 191, 197
Seat belts ....................................................... 365
Clock ................................................ 69, 72, 344
Clock light ...................................................... 330
Coat hooks..................................................... 343
Coin holder .................................................... 336
Condenser ..................................................... 382
Console box .................................................. 337
Consumption screen .................................... 87
Cooling system.............................................. 381
Engine overheating................................... 443
Cornering lights ............................................. 177
Cruise control
Dynamic radar cruise control with
full-speed range ........................... 238, 241
Cup holders ................................................... 336
Current fuel consumption .......................... 78
Curtain shield airbags .................................. 29
Customizable features .............................. 468
D
Daytime running light system ................... 175
Defogger
Outside rear view mirrors.......................314
Rear window ..................................................314
Windshield ......................................................314
Differential
Front differential oi l............. .............. .........452
Rear differential oil......... .......... ........... .......453
Dimension ...................................................... 448
Dinghy towing.................................................159
Display
Center Display ........................................... 306
Dynamic radar cruise control with
full-speed range ........................................241
Head-up display............................................83

500 Alphabetical Index
LS500_OM_OM50F54U_(U) If the engine will not start ....................... 433
If the fuel filler door cannot be opened
......................................................................... 435
If you have a flat tire .................................. 432
If you lose your keys................................. 435
If you think something is wrong ...........416
If your vehicle becomes stuck............. 446
If your vehicle has to be stopped in an
emergency ................................................. 410
If your vehicle needs to be towed ....... 412
If your vehicle overheats ........................ 443
Engine
ACCESSORY mode ............................... 162
Compartment ..............................................377
Engine compartment cover ................. 378
Engine switch................................................ 160
Fuel pump shut off system ...................... 417
Hood................................................................ 375
How to start the engine........................... 160
Identification number ............................... 449
If the engine will not start ....................... 433
If your vehicle has to be stopped in an
emergency ................................................. 410
Ignition switch (engine switch) ............ 160
Overheating................................................. 443
Tachometer .............................................69, 72
Engine compartment cover .................... 378
Engine coolant
Capacity ...........................................................451
Checking ........................................................ 381
Preparing and checking before winter
......................................................................... 299
Engine coolant temperature gauge 69, 72
Engine immobilizer system ........................ 58
Engine oil
Capacity .........................................................450
Checking ....................................................... 379
Preparing and checking before winter
......................................................................... 299
Warning light .................................................419
Engine oil maintenance data ................... 381 Engine switch ................................................. 160
Auto power off function............................162
Changing the engine switch modes ..162
If your vehicle has to be stopped in an
emergency .................................................. 410
EPS (Electric Power Steering) .............. 294
Warning light .................................................421
Event data recorder (E DR) ............................7 F
FCTA (Front Cross Traffic Alert) ...........218
First-aid kit storage belt ............................ 340
Flat tire
Tire pressure warning system ............ 388
Floor mats ...........................................................22
Fluid
Automatic transmission ..........................452
Brake ................................................................453
Washer .......................................................... 383
Footwell light ................................................. 330
Front air conditioning system ...................313
Front Cross Traffic Alert (FCTA) ...........218
Front passenger occupant classification
system .............................................................. 40
Front seats
Adjustment ....................................................... 116
Cleaning ........................................................ 365
Correct driving posture ............................ 23
Driving position memory ......................... 127
Head restraints..............................................132
Memory recall function............................ 130
Power easy access system ..................... 127
Refresh system ............................................... 121
Seat heaters ..................................................326
Seat position memory ............................... 127
Seat ventilators ............................................326
Front side marker light
Light switch .....................................................175
Replacing light bulbs ............................... 408
Front turn signal lights
Replacing light bulbs ............................... 408
Turn signal lever .......................................... 169

504 Alphabetical Index
LS500_OM_OM50F54U_(U) N
Navigation system-linked display..... 81, 83
Noise from under vehicle ...............................6 O
“ODO TRIP” switch .............................. 70, 75
Odometer ................................................. 70, 75
Odometer and trip meter display
Display items .......................................... 70, 75
“ODO TRIP” switch ........................... 70, 75
Pop-up display.........................................71, 75
Oil
Engine oil .......................................................450
Front differential oil ................................... 452
Rear differential oil .................................... 453
Opener
Fuel filler door............................................... 185
Hood................................................................ 375
Trunk ..................................................................102
Outer foot lights
Location..........................................................330
Outside door handle lights...................... 330
Outside rear view mirrors
Adjustment...................................................... 137
BSM (Blind Sport Monitor) ...................251
Folding ............................................................. 138
Linked mirror functi on when reversing
........................................................................... 137
Mirror position memory........................... 127
Outside rear view mirror defoggers . 314
RCTA function ............................................ 264
Outside temperature............................ 69, 72
Overheating .................................................. 443
P
Paddle shift switches ..........................167, 168
Panic mode ....................................................... 94
Panoramic moon roof
Jam protection function............................146
Operation........................................................ 144 Parking assist sensors (intuitive parking
assist) ............................................................. 257
Parking brake
Operation ....................................................... 170
Parking brake engaged warning buzzer
............................................................................ 172
Warning light ...............................................425
Warning message ....................................... 172
Parking lights
Light switch .....................................................175
Replacing light bulbs ............................... 408
Parking Support Brake function (for
rear-crossing vehicles) .......................... 282
Function ..........................................................282
Parking Support Brake function (rear
pedestrians) ...................................... 271, 286
Function ......................................................... 286
Parking Support Brake function
(rear-crossing vehicles)........................... 271
Parking Support Brake function (static
objects) ................................................ 271, 277
Function .......................................................... 277
PCS (Pre-Collision System)
Function ...............................................200, 210
PCS OFF switch ............................. 203, 213
Warning light ............................................... 424
Warning message ............................ 210, 217
Personal lights............................................... 330
PKSA (Parking Support Alert) .............. 256
PKSB (Parking Support Brake)............... 271
Warning message ..................................... 275
Pop Up Hood................................................... 38
Power easy access system ........................ 127
Power outlets ................................................ 344
Power rear seat ..............................................123
Power steering (Elect ric power steering
system) .......................................................... 294
Warning light .................................................421
Power trunk opener and closer ..............102
Power windows
Door lock linked window operation . 140
Jam protection function ........................... 139