coolant temperature LEXUS LS500 2019 User Guide

4157-2. Steps to take in an emergency
LS500_OM_(U)_1810 7
When trouble arises ■
Brake system warning light (warning buzzer)
■
Brake system warning light (warning buzzer)
■
High coolant temperature warning light *
(warning buzzer)
*
: This light illuminates on the multi-information display.If a warning light turns on or a warning buzzer soundsCalmly perform the following actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, bu t then goes off, this does not necessar-
ily indicate a malfunction in the system. However, if this continues to occur,
have the vehicle inspected by your Lexus dealer.
Actions to the warning lights or warning buzzers Warning light Details/Actions(U.S.A.)
or (red)
(Canada) Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and contact your Lexus
dealer. Continuing to drive the vehicle may be dangerous.
Indicates that the brake pads are worn out (only the right-side pads can
be detected)
 Have the vehicle inspected by your Lexus dealer.
Warning light Details/Actions
(yellow) Indicates a malfunction in:
 The electronically controlled brake sy stem (vehicles with Lexus Safety
System + A); or
 The parking brake system
 Have the vehicle inspected by your Lexus dealer immediately.
Warning light Details/Actions
Indicates that the engine coolant temperature is too high
 Immediately stop the vehicle in a safe place.
Handling method (  P.440)

440 7-2. Steps to take in an emergency
LS500_OM_(U)_1810 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.73, 76) 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

442 7-2. Steps to take in an emergency
LS500_OM_(U)_1810 1 Remove the engine compartment
cover.
2 Remove the engine cover.
Lift the front of the engine cover straight up
and then pull it forward.
3 Remove the caps and .
4 Add coolant through the inlet of the cap
up to the “F” line , and then
replace the cap .
5 Add coolant through the inlet of the cap
until it is full, and then replace the
cap .
6 Install the engine compartment cover
and engine cover.
Engage the claws of the engine cover to install it.
A B
A C
A
B
B WARNING■
When inspecting under the hood of
your vehicle
Observe the following precautions.
Failure to do so may result in serious
injury such as burns. ●
If steam is seen coming from under the
hood, do not open the hood until the
steam has subsided. The engine com-
partment may be very hot. ●
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. ●
Do not loosen the coolant inlet cap,
the engine coolant reservoir cap or the
intercooler coolant reservoir cap while
the engine and radiator are hot.
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.).

500 Alphabetical Index
LS500_OM_(U)_1810 If the electronic key does not operate
properly....................................................... 433
If the engine will not start .......................430
If the fuel filler door cannot be opened
......................................................................... 432
If the vehicle is trapped in rising water
......................................................................... 407
If you have a flat tire .................................. 429
If you lose your keys................................. 432
If you think something is wrong ........... 413
If your vehicle becomes stuck............. 443
If your vehicle has to be stopped in an
emergency ................................................406
If your vehicle needs to be towed .....409
If your vehicle overheats ........................440
Engine
ACCESSORY mode ...............................166
Compartment ............................................. 373
Engine compartment cover ................. 374
Engine switch.................................................164
Fuel pump shut off system ...................... 414
Hood.................................................................. 371
How to start the engine............................164
Identification number ............................... 447
If the engine will not start .......................430
If your vehicle has to be stopped in an
emergency ................................................406
Ignition switch (engine switch) .............164
Overheating.................................................440
Tachometer ............................................. 73, 76
Engine compartment cover .................... 374
Engine coolant
Capacity ......................................................... 449
Checking ........................................................377
Preparing and checking before winter
........................................................................ 300
Engine coolant temperature gauge 73, 76
Engine immobilizer system ........................ 63
Engine oil
Capacity .........................................................448
Checking ....................................................... 375 Preparing and checking before winter
......................................................................... 300
Warning light ................................................ 416
Engine oil maintenance data ...................377
Engine switch ..................................................164
Auto power off function........................... 166
Changing the engine switch modes . 166
If your vehicle has to be stopped in an
emergency ................................................ 406
EPS (Electric Power Steering) .............. 295
Warning light ................................................ 418
Event data recorder (E DR) ............................7 F
FCTA (Front Cross Traffic Alert) ......... 222
First-aid kit storage belt ..............................341
Flat tire
Tire pressure warning system ............ 384
Floor mats ...........................................................22
Fluid
Automatic transmission ......................... 450
Brake ................................................................. 451
Washer ........................................................... 379
Footwell light ...................................................331
Front automatic air conditioning system
............................................................................313
Front Cross Traffic Alert (FCTA) ......... 222
Front passenger occupant classification
system .............................................................. 40
Front seats
Adjustment ....................................................... 119
Cleaning .......................................................... 361
Correct driving posture ............................ 23
Driving position memory ........................ 130
Head restraints............................................. 135
Memory recall function............................ 133
Power easy access system .................... 130
Refresh system ..............................................124
Seat heaters ..................................................326
Seat position memory .............................. 130
Seat ventilators ............................................326

5091-1. What to do if... (Troubleshooting)
LS500_OM_(U)_1810 509Alphabetical Index
Charging system .........................................416
Downshifting ........................................ 172, 173
Drive-Start Control .................................... 417
Electric power steering ........................... 418
Engine ...............................................................416
High coolant temperature ......................415
Intuitive parking assist.................. 263, 420
Low engine oil pressure...........................416
LTA (Lane Tracing Assi st)..........225, 419
Open door............................................ 101, 103
Open window ............................................... 143
PKSA (Parking Support Alert) ........... 256
PKSB (Parking Support Brake) ........... 421
Pop Up Hood ............................................... 417
Pre-collision braking......................204, 216
RCD (Rear Camera Detection) ........ 420
RCTA (Rear Cross Traffic Alert) ...... 420
Seat belt ................................................. 418, 419
Warning lights.................................................415
ABS .................................................................... 417
Brake hold operated indicator ........... 422
Brake Override System ........................... 417
Brake system .................................................415
Charging system .........................................416
Drive-Start Control .................................... 417
Electric power steering ........................... 418
High coolant temperature ......................415
Intuitive parking assist OFF indicator
......................................................................... 420
Low engine oil pressure...........................416
Low fuel level ................................................ 418
LTA indicator .................................................419
Malfunction indicator lamp.....................416
Master warning light ................................ 422
Parking brake indicator .......................... 422
PKSB OFF indicator .................................. 421
Pop Up Hood ............................................... 417
Pre-collision system ................................... 421
RCD OFF indicator ................................. 420
RCTA OFF indicator............................... 420
Seat belt reminder light ................. 418, 419
Slip indicator .................................................. 421 SRS ..................................................................... 416
Tire pressure ................................................. 419
Warning messages ..................................... 425
Warning reflector storage belt................341
Washer
Adding............................................................. 379
Preparing and checking before winter
......................................................................... 300
Switch................................................................ 184
Washing and waxing..................................358
Weight
Cargo capacity .............................................162
Load limits .......................................................162
Weight.............................................................446
Wheels
Replacing wheels ........................................ 391
Size ....................................................................452
Window lock switch .....................................144
Windows
Power windows ............................................142
Rear window defogger.............................314
Washer ............................................................ 184
Windshield wiper de-icer ..........................319
Windshield wipers
Position............................................................. 187
Rain-sensing windshield wipers .......... 184
Winter driving tips.......................................300
Wireless remote control
Battery-Saving Function............................ 112
Locking/Unlocking .....................................98
Replacing the battery .............................. 399
?
For information regarding the
equipment listed below, refer to
the “NAVIGATION AND MULTI-
MEDIA SYSTEM OWNER’S
MANUAL”.
· Navigation system
· Audio/visual system