2018 Lexus LC500h engine overheat

1644-2. Driving procedures
LC500_LC500h_OM_OM11405U_(U)
■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 indicator light
●Depending on the engine switch switch> mode, the pa rking brake indica-
tor 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 mode>: Stays on for approximately 15
seconds.
●When the engine switch
is turned off with the parking brake set,
the parking brake indi cator light will stay
on for about 15 seconds. This does not
indicate a malfunction.
■When the parking brake switch mal-
functions
Automatic mode (automatic brake setting
and releasing) will be turned on automati-
cally.
■Parking the vehicle
 P.130
■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.334
■Usage in winter time
 P.233
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, shift the
shift position to P, set the parking brake
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.

2515-3. Using the air conditioning system
LC500_LC500h_OM_OM11405U_(U)
5
Interior features
Display the air conditioning control
screen ( P.245)
Adjust the seat heater temperature
level
Each time the switch is selected, the tem-
perature level and leve l indicator (orange)
change as follows:
AUTO  Hi  Mid  Lo  Off
Adjust the seat ventilator fan speed
level
Each time the switch is selected, the fan
speed level and leve l indicator (blue)
change as follows:
AUTO  Hi  Mid  Lo  Off
Adjust the heated steering wheel
temperature level
Each time the switch is selected, the tem-
perature level and le vel indicator change
as follows:
AUTO  Hi  Lo  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
Steering wheel heating preference in auto-
matic mode and the automatic mode set-
tings for the seat heat ers and ventilators can
be changed. (Customizable features:
 P.391)
A
B
C
D
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.

325
LC500_LC500h_OM_OM11405U_(U)
7
7
When trouble arises
When trouble arises
7-1. Essential informationEmergency flashers.................. 326
If your vehicle has to be stopped in an emergency .......................... 326
7-2. Steps to take in an emergency If your vehicle needs to be towed........................................................ 328
If you think something is wrong ........................................................ 332
Fuel pump shut off system (LC500).................................... 333
If a warning light turns on or a warning buzzer sounds ....... 334
If a warning message is displayed ........................................................ 344
If you have a flat tire.................. 350
If the engine will not start (LC500)..................................... 351
If the hybrid system will not start (LC500h) ................................. 352
If you lose your keys ................. 354
If the fuel filler door cannot be opened........................................ 354
If the electronic key does not operate properly .................... 355
If the 12-volt battery is discharged ........................................................ 357
If your vehicle overheats (LC500).................................... 364
If your vehicle overheats (LC500h) ................................. 366
If the vehicle becomes stuck 370

3467-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
●Malfunction in the EPS (Electric Power Steering) system
The electric power steering sy stem warning light comes on. ( P.335)
●Malfunction in the tire pressure warning system
The tire pressure warn ing light comes on. (P.340)
●Remaining fuel level is low
The low fuel level warning light comes on. ( P.338)
■If “Hybrid System Overheated Reduce d Output Power” is shown (LC500h)
This message may be displayed when driving under severe operating conditions. (For exam-
ple, when driving up a long steep hill.) Stop and check. ( P.366)
■If “Traction Battery Needs to be Protected Refrain from the Use of [N] Position” is
shown (LC500h)
The remaining charge for the hybrid battery (tra ction battery) is low. As the hybrid battery
(traction battery) cannot be charged when the shift position is in N, when stopping the vehi-
cle for a long period of time, shift the shift position to P.
■If “Traction Battery needs to be Protected Sh ift into [P] to Restart” is shown (LC500h)
The remaining charge for the hybrid battery (traction battery) is low, because the shift posi-
tion has been shifted to N for a long period of time. When moving the vehicle, shift the shift
position to P and restart the hybrid system.
■If “Shift to P Before Ex iting Vehicle” is shown
The driver’s door is opened without turning the engine switch to off with the
shift lever in any position other th an P. Shift the shift lever to P.
■If “Shift Is in N Release Accelerator Before Shifting” is shown
The accelerator pedal has been depressed when th e shift position is in N. Release the accel-
erator pedal and shift the shift position to D or R.
■If “Depress Brake when Vehicle Is Stoppe d Hybrid System May Overheat” is shown
(LC500h)
The message may be displayed when the accelerator pedal is depressed to hold the vehicle
while the vehicle is stopped on an uphill etc. The hybrid system may overheat. Release the
accelerator pedal and de press the brake pedal.
■If “Shift system malfunction Driving unavailable” is shown
There is a malfunction in the shift control system. Have the vehicle inspected by your Lexus
dealer immediately.
■If “Auto Power Off to Conserve Battery” is shown
LC500:
Power was turned off due to the automatic power off function. Next time when starting the
engine, increase the engine speed slightly an d maintain that level for approximately 5 min-
utes to recharge the battery.
LC500h:
Power was turned off due to the automatic power off function. Next time when starting the
hybrid system, operate the hybrid system for approximately 5 minutes to recharge the 12-
volt battery.
■If a message that indicates the need for the shift lever operation is shown
To prevent the shift lever from being operated incorrectly or the vehicle from moving unex-

3647-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
1Stop 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.
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 “F” and “L” lines on
the reservoir.
Reservoir
“F”
“L”
Coolant inlet cap
5 Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
If your vehicle overheats
(LC500)
The following may indicate that
your vehicle is overheating.
The engine coolant temperature
gauge ( P.74) is in the red zone
or a loss of engine power is expe-
rienced. (For example, the vehicle
speed does not increase.)
 “Engine Coolant Temp High” is
shown on the multi-information
display.
 Steam comes out from under the
hood.
Correction procedures
A
B
A
B
C
D

3667-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
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.
WARNING
●Keep hands and clothing (especially a
tie, a scarf or a muffler) away from the
fan and belts. Failure to do so may
cause the hands or clothing to be
caught, resulting in serious injury.
●While the engine and radiator are hot,
do not loosen or remove the coolant
reservoir cap.
High temperature steam or coolant
could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has
cooled down sufficiently. Adding cool
coolant to a hot engine too quickly can
cause damage to the engine.
■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.
If your vehicle overheats
(LC500h)
The following may indicate that
your vehicle is overheating.
 The engine coolant temperature
gauge ( P.74) is in 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” is shown on the multi-
information display.
 Steam comes out from under the
hood.
Correction procedures

3677-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
7
When trouble arises
3 After the hybrid system has cooled
down sufficiently, inspect the hoses
and cooling system for leaks.
Radiator
Cooling fan
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir.
Reservoir
“F”
“L”
Coolant inlet cap
5 Add coolant if necessary.
Water can be used in an emergency if engine coolant is unavailable.
6
Start 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 oper ate 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
Reduced Output Power” 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.
A
B
A
B
C
D

421What to do if... (Troubleshooting)
LC500_LC500h_OM_OM11405U_(U)Alphabetical index421
C
Care ........................................................274, 277 Aluminum wheels ...................................... 275
Exterior ........................................................... 274
Interior ..............................................................277
Seat belts.........................................................277
Cargo capacity.............................................. 138
Cargo hooks ................................................. 256
Center Display ............................................. 236
Chains .............................................................. 234
Child restraint system................................... 43 Fixed with a LATCH system ..................50
Fixed with a seat belt....................................47
Front passenger occupant classification system ............................................................. 38
Points to remember .................................... 43
Riding with children ..................................... 43
Types of child restraint system installation method ........................................................... 44
Using an anchor bracket .......................... 52
Child safety ....................................................... 43 12-volt battery precautions .......299, 363
Airbag precautions...................................... 33
Child restraint system................................. 44
Heated steering wheel and seat heater precautions................................................ 249
How your child should wear the seat belt ............................................................................ 25
Power window lock switch..................... 126
Power window precautions ................... 126
Removed electronic key battery precau- tions ................................................................ 318
Seat belt extender precautions ............. 25
Seat belt precautions .................................. 43
Trunk precautions ...................................... 103
Cleaning................................................274, 277 Aluminum wheels ...................................... 275
Exterior ........................................................... 274
Interior ..............................................................277
Radar sensor........................................182, 217
Seat belts.........................................................277 Clock ................................................................ 258
Coat hooks..................................................... 259
Condenser ..................................................... 296
Console box .................................................. 255
Console box light ........................................ 255
Cooling system............................................. 295
Engine overheating...................... 364, 366
Hybrid system overheating .................. 367
Cornering lights .............................................169
Cruise control Dynamic radar cruise control with full-
speed range ............................................... 198
Cup holder ..................................................... 255
Current fuel consumption ...........................79
Curtain shield airbags .................................. 28
Customizable features ................................391
D
Daytime running light system ................... 167
Defogger Outside rear view mirrors..................... 243
Rear window ................................................ 243
Windshield .................................................... 243
Differential ...................................................... 378
Dimension ...................................................... 372
Dinghy towing.................................................139
Display BSM (Blind Spot Monitor)..................... 215
Drive information .......................................... 79
Dynamic radar cruise control with full-
speed range ............................................... 198
Energy monitor ..............................................89
Head-up display............................................84
Intuitive parking assist ............................. 209
LKA (Lane-Keeping Assist) .................. 194
Multi-information display .......................... 78
Warning message ..................................... 344
Distance ..............................................................79
Do-it-yourself maintenance .................... 283
Door courtesy lights ................................... 252
Door lock Doors .................................................................. 99