2021 Lexus LC500C engine overheat

2425-3. Using the air conditioning system
Adjust the neck heater fan speed
level
The neck heater can be adjusted in 3 lev-
els.
When the neck heater is operated, the fan
speed level is displayed on the screen.
Automatic mode on/off indicators
When the automatic mode is on, the indi-
cator illuminates on the screen.
Sub function menu
When the sub function button on the
Remote Touch is pressed, the following
functions can be set to automatic mode.
: Left-hand side neck heater
: Right-hand side neck heater
■Side display
Display the air conditioning control
screen ( P.235)
Adjust the seat heater temperature
level
Each time the switch is selected, the tem-
perature level and level 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 level 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 ON.
■Air conditioning system-linked control
mode
When the seat ventilator fan speed level is
Hi, the seat ventilator fan speed may
become 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 heaters and ventilators can
be changed. (Customizable features:
 P.367)
A
B
C
A
B
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.
C
D

305
7
7
When trouble arises
When trouble arises
7-1. Essential informationEmergency flashers.................. 306
If your vehicle has to be stopped in an emergency ..................... 306
If the vehicle is trapped in rising water............................................ 307
7-2. Steps to take in an emergency If your vehicle needs to be towed........................................................ 309
If you think something is wrong ......................................................... 312
Fuel pump shut off system ...... 313
If a warning light turns on or a warning buzzer sounds ........ 314
If a warning message is displayed ........................................................ 323
If you have a flat tire.................. 327
If the engine wi ll not start .......328
If you lose your keys ................. 329
If the fuel filler door cannot be opened........................................ 330
If the electronic key does not operate properly .................... 330
If the battery is discharged .... 332
If the soft top roof cannot be closed .......................................... 338
If your vehicle overheats ........ 345
If the vehicle becomes stuck 347

3387-2. Steps to take in an emergency
Two or more people are needed for
this procedure and some steps
requires a large force.
 There is a possibility to damage the
vehicle when applying a strong
force or removing the parts. Lexus
recommends contact ing your Lexus
dealer.
WARNING
■When exchanging the battery
After exchanging, securely attach the
exhaust hose and exhaust hole plug to
the exhaust hole of the exchanged bat-
tery. If not properly installed, gases
(hydrogen) may leak into the vehicle
interior, and there is the possible danger
of the gas igniting and exploding.
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 battery from
another vehicle in an emergency. It can-
not be used to jump start another vehicle.
If the soft top roof cannot be
c
losed
If the soft top roof cannot be closed
even though the roof switch is oper-
ated, check that all the operational
conditions are met. ( P.127)
If all the operational conditions are
met and the soft top roof cannot be
closed, there may be a malfunction.
Immediately have the vehicle
inspected by your Lexus dealer.
When “Opening Function Unavail-
able System Overheated” or
“Function Temporarily Unavailable
System Overheated” is displayed
on the multi-information display, do
not close the soft top roof manually.
If the soft top roof is closed manu-
ally, the roof switch may not prop-
erly operates next time.
In this case, the soft top roof can be
closed by the following procedure
as an emergency measure, how-
ever, Lexus does not recommend it
as this procedure requires special-
ized knowledge.
Before closing the soft top roof

3457-2. Steps to take in an emergency
7
When trouble arises
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” line
“L” line
Coolant inlet cap
5 Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
6Start the engine 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
If your vehicle overheats
The following may indicate that
your vehicle is overheating.
The engine coolant temperature
gauge ( P.75) 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

Alphabetical index395
Exterior ...........................................................258
Interior ............................................................. 262
Seat belts........................................................ 262
Cargo capacity...............................................144
Cargo hooks ................................................. 248
Center Display ............................................. 226
Chains .............................................................. 224
Child restraint system................................... 46 Fixed with a LATCH system .................. 53
Fixed with a seat belt...................................50
Front passenger occupant classification system ............................................................... 41
Points to remember .................................... 46
Riding with children ..................................... 46
Types of child restraint system installation method ............................................................47
Child safety ....................................................... 46 Airbag precautions...................................... 33
Battery precautions ...................... 279, 337
Child restraint system..................................47
Heated steering wheel and seat heater precautions................................................ 240
How your child should wear the seat belt ............................................................................ 25
Installing child restraints ............................ 48
Power window lock switch.....................125
Power window precautions ................... 124
Removed electronic key battery precau- tions ...............................................................298
Seat belt extender precautions ............. 25
Seat belt precautions .................................. 46
Trunk precautions ...................................... 100
Cleaning...............................................258, 262 Aluminum wheels ...................................... 259
Exterior ...........................................................258
Interior ............................................................. 262
Radar sensor........................................ 173, 212
Seat belts........................................................ 262
Clock ........................................................ 75, 249
Condenser ......................................................277
Console box ...................................................247
Console box light .........................................247 Cooling system..............................................276
Engine overheating...................................345
Cornering lights .............................................163
Cruise control Dynamic radar cruise control with full-
speed range ............................................... 194
Cup holder ......................................................247
Current fuel consumption .......................... 80
Customizable features .............................. 367
D
Daytime running light system .................... 161
Defogger Outside rear view mirrors..................... 233
Rear window ................................................ 233
Windshield .................................................... 233
Differential ...................................................... 354
Dimension ......................................................350
Dinghy towing.................................................145
Display BSM (Blind Spot Monitor)................... 209
Drive information ......................................... 80
Dynamic radar cruise control with full-
speed range ............................................... 194
Head-up display............................................85
Intuitive parking assist ..............................204
LKA (Lane-Keeping Assist) .................. 189
Multi-information display .......................... 79
Warning message ..................................... 323
Distance ............................................................. 80
Do-it-yourself maintenance .................... 266
Door courtesy lights ................................... 244
Door lock Doors .................................................................. 96
Smart access system with push-button start ................................................................. 103
Wireless remote control ........................... 94
Door pockets ................................................ 246
Doors ................................................................... 96 Automatic door lock ing and unlocking
system..............................................................99
Door glasses .................................................. 122

396Alphabetical index
Door lock.......................................................... 96
Open door warning buzzer .......... 97, 99
Outside rear view mirrors ....................... 119
Drive info 1/Drive info 2 .............................. 80
Drive information ........................................... 80
Driver’s seat position memory .................. 112 Driving position memory...........................112
Memory recall function ..............................114
Power easy access system .......................112
Drive-start control ........................................ 137
Driving................................................................136 Break-in tips ................................................... 137
Correct driving posture .............................23
Driving mode select switch .................. 203
Procedures .....................................................136
Winter drive tips......................................... 223
Driving mode select switch ..................... 203
Driving position memory Power easy access system .......................112
Dynamic radar cruise control with full- speed range..................................................194Warning message.......................................201
E
ECB (Electronically Controlled Brake Sys- tem) ..................................................................218
Eco drive mode ............................................ 203
Eco Driving Indicator.....................................73
Eco Driving Indicator Light .........................73
EDR (Event data recorder) ............................7
Elapsed time ..................................................... 80
Electric Power Steering (EPS) Function ............................................................ 219
Warning light .................................................315
Electronically Controlled Brake System (ECB) ..............................................................218
Electronic key .................................................. 92 Battery-saving function ........................... 104
If the electronic key does not operate properly.......................................................330
Replacing the battery............................... 297
Emergency, in case of If a warning buzzer sounds.....................314
If a warning light turns on.........................314
If a warning message is displayed ..... 323
If the battery is discharged .................... 332
If the electronic key does not operate
properly ...................................................... 330
If the engine will not start........................328
If the fuel filler do or cannot be opened
......................................................................... 330
If the soft top roof cannot be closed 338
If the vehicle is trapped in rising water ..........................................................................307
If you have a flat tire .................................. 327
If you lose your keys .................................329
If you think something is wrong............312
If your vehicle becomes stuck ............. 347
If your vehicle has to be stopped in an emergency ................................................ 306
If your vehicle needs to be towed .... 309
If your vehicle overheats ........................345
Emergency flashers .................................... 306
Engine ACC.................................................................. 149
Compartment.............................................. 274
Engine switch ................................................ 146
Fuel pump shut off system...................... 313
Hood ................................................................ 272
How to start the engine ........................... 146
Identification number ................................ 351
If the engine will not start........................328
If your vehicle has to be stopped in an emergency ................................................ 306
Ignition switch (engine switch)............. 146
Overheating .................................................345
Engine coolant...............................................276 Capacity .........................................................352
Checking ....................................................... 276
Preparing and checking before winter.......................................................................... 223
Engine coolant temperature gauge ....... 75
Engine immobilizer system ........................ 63
Engine oil .........................................................274

400Alphabetical index
N
Navigation system-linked display... 82, 85
Neck heaters................................................. 240
Noise from under vehicle ...............................6
O
Odometer ..........................................................75
OilDifferential oil ............................................... 354
Engine oil .........................................................351
Opener Fuel filler door..................................................171
Hood.................................................................272
Trunk ................................................................... 101
Outside door handle lights...................... 244
Outside rear view mirrors .......................... 119 Adjustment....................................................... 119
BSM (Blind Spot Monitor) ...................209
Folding ..............................................................120
Linked mirror functi on when reversing
...........................................................................120
Mirror position memory.............................112
Outside rear view mirror defoggers233
Outside temperature.....................................75
Overheating .................................................. 345
P
Package tray..................................................... 40
Paddle shift switches ......................... 154, 155
Palm rest ........................................................... 122
Panic mode ....................................................... 94
Parking assist sensors (intuitive parking assist) ............................................................. 204
Parking brake.................................................. 157 Indicator ........................................................... 317
Operation........................................................ 157
Parking brake engaged warning buzzer.......................................................................... 158
Warning message...................................... 158
Parking lights .................................................... 161 Light switch ...................................................... 161
Replacing light bulbs ............................... 303
PCS (Pre-Collision System) ..................... 179 Function ............................................................179
PCS OFF switch ........................................... 181
Warning light ................................................ 316
Personal lights............................................... 244
Pop-up display .................................................. 77
Pop Up Hood................................................... 36
Power easy access system ......................... 112
Power outlet .................................................. 249
Power steering (Elect ric power steering
system) ............................................................219 Warning light ................................................ 315
Warning message ..................................... 324
Power windows .............................................. 122 Door lock linked window operation ..124
Jam protection function ............................124
Operation ........................................................ 122
Window lock switch.................................. 125
Pre-Collision System (PCS) ..................... 179 Function ............................................................179
PCS OFF switch ........................................... 181
Warning light ................................................ 316
Warning message ..................................... 324
R
Radar cruise control (dynamic radar cruise control with full-speed range)...............194
Radiator ............................................................277
Rear quarter windows ................................. 122
Rear side marker lights ................................ 161 Light switch ...................................................... 161
Replacing light bulbs ............................... 303
Rear turn signal lights ..................................156 Replacing light bulbs ............................... 303
Turn signal lever .......................................... 156
Rear view mirror Inside rear view mirror ............................... 118
Outside rear view mirrors........................ 119
Rear window defogger ............................. 233
Refueling ............................................................ 171