2018 LEXUS LX570 overheating

90
LX570_OM_OM60Q78U_(U) 2. Instrument cluster■
The meters and display illuminate when
The engine switch is in IGNITION ON mode. ■
The brightness of the instrument panel lights
When the tail lights are turned on, the meter’s brightness will be re duced slightly unless
the meter brightness leve l adjustment is set to the brightest setting.
If the tail lights are turned on when the surr oundings are dark, the meter’s brightness will
be reduced slightly. However, when the surro undings are bright, such as during the day-
time, the meter’s brightness w ill not be reduced even if th e tail lights are turned on.■
Customization
The meter display can be customized on the multi-information display. ( → P. 580)
WARNING ■
The information display at low temperatures
Allow the interior of the vehicle to warm up before using the liquid crystal information
display. At extremely low temperatures, th e information display monitor may respond
slowly, and display changes may be delayed.
For example, there is a lag between the dr iver’s shifting and the new gear number
appearing on the display. This lag could ca use the driver to downshift again, causing
rapid and excessive engine braking and possibly an accident resulting in death or
injury.
NOTICE ■
To prevent damage to the engine and its components●
Do not let the indicator needle of the tachometer enter the red zone, which indicates
the maximum engine speed. ●
The engine may be overheating if the engine coolant temperature gauge is in the red
zone (H). In this case, immediately stop the vehicle in a safe place, and check the
engine after it has cooled completely. ( → P. 552)■
Voltmeter
When the voltmeter indicates 19 V or higher or 9 V or lower while the engine is run-
ning, there may be a battery or charging system malfunction. Have the vehicle
inspected at your Lexus dealer. ■
Engine oil pressure gauge
When the value of the engine oil pressure gauge drops while the engine is running,
stop the vehicle in a safe place immediat ely and check the amount of engine oil.
( → P. 475)
When the oil pressure drops even though th e engine oil amount has not decreased, or
if the oil pressure does not increase when engine oil is added, contact your Lexus
dealer, as there may be a problem with the lubrication system.

198
LX570_OM_OM60Q78U_(U) 4-1. Before driving●
Avoid jerky starts or sudden acceleration. ●
Avoid jerky steering and sharp turns, an d slow down before making a turn.●
Note that when making a turn, the trailer wheels will be closer than the vehicle
wheels to the inside of the turn. Compensate by making a wider than normal
turning radius. ●
Slow down before making a turn, in cr osswinds, on wet or slippery surfaces,
etc.
Increasing vehicle speed can destabilize the trailer. ●
Take care when passing other vehicles . Passing requires considerable dis-
tance. After passing a vehicle, do not fo rget the length of your trailer, and be
sure you have plenty of room before changing lanes. ●
To maintain engine braking efficien cy and charging system performance
when using engine braking, do not put the transmission in D.
If in the S mode, the transmission shift range position must be in 6 or lower.
( → P. 210)●
Instability happens more fr equently when descending steep or long downhill
grades. Before descending, slow down and downshift. Do not make sudden
downshifts while descending st eep or long downhill grades.●
Avoid holding the brake pedal down too long or applying the brakes too fre-
quently. This could cause the brakes to overheat and result in reduced braking
efficiency. ●
Due to the added load of the trailer, yo ur vehicle’s engine may overheat on hot
days (at temperatures over 85°F [30°C]) when driving up a long or steep
grade. If the engine coolant temperat ure gauge indicates overheating, imme-
diately turn off the air conditioning (if in use), pull your vehicle off the road and
stop in a safe spot. ( → P. 552)

208
LX570_OM_OM60Q78U_(U) 4-2. Driving procedures■
When the steering lock cannot be released
■
Steering lock motor overheating prevention
To prevent the steering lock motor from over heating, the motor may be suspended if the
engine is turned on and off re peatedly in a short period of time. In this case, refrain from
running the engine. After about 10 seconds, the steering lock motor will resume func-
tioning. ■
When “Smart Access System Malfunction See Owner’s Manual” is displayed on the
multi-information display
The system may be malfunctioning. Have th e vehicle inspected by your Lexus dealer,
immediately. ■
If the electronic key battery is depleted
→ P. 503 ■
If the smart access system with push-button start has been deactivated in a customized
setting
→ P. 546A message will be displayed on the multi-infor-
mation display.
Check that the shift lever is set in P. Press the
engine switch while turn ing the steering wheel
left and right.
WARNING ■
When starting the engine
Always start the engine while sitting in the driver’s seat. Do not depress the accelerator
pedal while starting the engine under any circumstances.
Doing so may cause an accident resu lting in death or serious injury.■
Caution while driving
If engine failure occurs while the vehicle is moving, do not lock or open the doors until
the vehicle reaches a safe and complete stop. Activation of the steering lock in this cir-
cumstance may lead to an accident, re sulting in death or serious injury.■
Stopping the engine in an emergency ●
If you want to stop the engine in an em ergency while driving th e vehicle, press and
hold the engine switch for more than 2 seco nds, or press it briefly 3 times or more in
succession. ( → P. 511)
However, do not touch the engine switch wh ile driving except in an emergency. Turn-
ing the engine off while drivin g will not cause loss of steering or braking control, but
the power assist to these systems will be lost . This will make it more difficult to steer
and brake, so you should pull over and stop the vehicle as soon as it is safe to do so. ●
If the engine switch is operated while the vehicle is running, a warning message will be
shown on the multi-information display and a buzzer sounds. ●
When restarting the engine after it was turn ed off while driving, shift the shift lever to
N and press the engine switch.

LX570_OM_OM60Q78U_(U) 2194-2. Driving procedures
4
Driving Sets the parking brake The parking brake indicator light will
come on. ( → P. 219)
Pull and hold the parking brake switch if
an emergency occurs and it is necessary
to operate the parking brake while driv-
ing.
Releases the parking brake Operate the parking brake switch while
depressing the brake pedal. Make sure
that the parking brake indicator light
goes off. ■
Parking the vehicle
→ P. 174 ■
Parking brake operation ●
When the engine switch is not in IGNITION ON mode, the parking brake cannot be
released using the parking brake switch. ●
When the engine switch is not in IGNITION ON mode, automatic mode (automatic
brake setting and releasing) is not available. ■
If “Parking Brake Overheated Parking Brak e Unavailable” is displayed on the multi-
information display
If the parking brake is operated repeatedly over a short period of time, the system may
restrict operation to prevent overheating. If this happens, refrain from operating the
parking brake. Normal operation wi ll return after about 1 minute.■
Parking brake operation sound
When the parking brake operates, a motor so und (whirring sound) may be heard. This
does not indicate a malfunction. ■
Parking brake indicator light ●
Depending on the engine switch mode, the parking brake indicator light will come on
and stay on as described below:
IGNITION ON mode: Comes on unt il the parking brake is released.
Not in IGNITION ON mode: Stays on for approximat ely 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 in dicate a malfunction.■
Changing the mode
When changing the automatic mode on/off , the message will be shown on the multi-
information display and the buzzer sounds. ■
Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driv en with the parking brake engaged. “Release
Parking Brake” is displayed on the multi-information display.Manual mode U.S.A. Canada1
2

310
LX570_OM_OM60Q78U_(U) 4-5. Using the driving support systems■
Automatic system cancelation 
Crawl Control
In the following situations, the buzzer will sound intermittently an d Crawl Control will be
canceled automatically. In this event, the Crawl Control indicator will flash and then go
off, the Turn Assist indicator will go off (if th e Turn Assist function is in use), and a message
stating that Crawl Cont rol has been turned off will be di splayed on the multi-information
display for several seconds. ●
When the shift lever is moved to P or N. ●
When the four-wheel drive control switch is in H4. ●
When the driver’s door is opened. 
Turn Assist function
When the center differential is locked, the buzzer will sound inte rmittently and the Turn
Assist function will be canceled automatically. In this event, the Turn Assist indicator will
go off, and a message stating that the Turn Assi st function has been turned off will be dis-
played on the multi-informatio n display for several seconds.■
Function limitations 
Crawl Control ●
In the following situations, brake control can be used to drive downhill at a constant
speed. However, engine control is not available when drivin g uphill at a co nstant speed.
•When switched to second start mode.●
In the following situation, engine control an d brake control will stop temporarily. In this
event, the Crawl Control indicator will flash.
• When the vehicle speed exceeds approximately 15 mph (25 km/h). 
Turn Assist function
In the following situations, the Turn Assist func tion will stop temporarily. In this event, the
Turn Assist indicator will flash. ●
When the vehicle speed exceeds approximately 6 mph (10 km/h). ●
When the shift lever is moved to R. ■
When the Crawl Control system is operated continuously●
If Crawl Control is used continuously for a long time, the buzzer will sound, a malfunc-
tion notification will be displayed on the multi-information display, the Crawl Control
indicator will go off, and Crawl Control will be temporarily inoperable as a result of the
brake system overheating. In this event, stop the vehicle immediately in a safe place,
and allow the brake system to cool down sufficiently until the TRAC OFF indicator
goes off. (In the meantime, normal driving is possible.) ●
If Crawl Control is used continuously for a long time, the buzzer will sound, the system
will be temporarily canceled, and a malfunct ion notification will be displayed on the
multi-information display as a result of th e automatic transmission system overheating.
Stop the vehicle in a safe place until the display goes off. ■
When depressing the accelerator pedal while the Crawl Control is operating
Multi-terrain Select operates in AUTO mode. ( → P. 313)

413
LX570_OM_OM60Q78U_(U) 5-3. Using the air conditio ning system and defogger
5
Interior features
Heated steering wheel ∗
/seat heaters/seat
ventilators ∗
∗ : If equippedHeated steering wheel and seat heaters heat the side grips of the steering
wheel and seats. Seat ventilators maintain good airflow by blowing air from
the seats. WARNING ●
Care should be taken to prevent injury if anyone in the following categories comes in
contact with the steering wheel and seats when the heater is on:
• Babies, small children, the elderly, the sick and the ph ysically challenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sleeping drugs, cold
remedies, etc.) ●
Observe the following precautions to pr event the minor burns or overheating:
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use seat heater more than necessary.
NOTICE ●
Do not put heavy objects that have an unev en surface on the seat and do not stick
sharp objects (needles, nails, etc.) into the seat. ●
To prevent battery discharge, do not us e the functions when the engine is off.

552
LX570_OM_OM60Q78U_(U) 7-2. Steps to take in an emergency
If your vehicle overheats Stop the vehicle in a safe place and tu rn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down suff iciently, inspect th e hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans If a large amount of coolant leaks,
immediately contact your Lexus
dealer.The following may indicate that your vehicle is overheating. ●
The needle of the engine coolant temperature gauge ( → P. 88) enters the
red zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.) ●
Steam is coming from under the hood.
Correction procedures 1
2
3
1
2

615Alphabetical index
LX570_OM_OM60Q78U_(U) Coolant..................................................... 562
Capacity .................................................562
Checking................................................478
Preparing and checking
before winter ................................... 382
Cooling system
Engine overheating.......................... 552
Crawl Control ....................................... 307
Cruise control
Cruise control....................................... 281
Dynamic radar cruise control
with full-speed range ....................269
Cup holders ............................................ 423
Curtain shield airbags ........................... 38
Customizable features .......................580
Daytime running light system .......... 222
Defogger
Outside rear view mirrors ............ 405
Rear window ....................................... 405
Windshield ........................................... 405
Differential ............................................... 563
Dimension ...............................................558
Dinghy towing........................................ 204 Display
Crawl Control..................................... 307
Drive information.................................. 94
Dynamic radar cruise control
with full-speed range ................... 269
Fuel consumption information ..... 106
Head-up display ................................. 100
Intuitive parking assist......................288
LDA (Lane Departure Alert)....... 264
Multi-information display.................... 91
Multi-terrain Monitor .........................316
Multi-terrain Select ............................. 312
Warning messages ..........................528
Do-it-yourself maintenance..............470
Door courtesy lights
Location ................................................... 417
Doors
Automatic door locking and
unlocking system............................... 119
Back door................................................ 122
Door glasses ..........................................165
Door lock.................................................. 115
Open door warning buzzer ........ 522
Open door warning light .............. 522
Outside rear view mirrors .............. 162
Rear door child-protectors ............. 118
Side doors ................................................ 115D
* : Refer to
the “NAVIGATION SYSTEM OWNER’S MANUAL”.