2019 Lexus GX460 overheating

GX460_OM_OM60Q84U_(U)
892. Instrument cluster
2
Instrument cluster
■The meters and display illuminate when
The engine switch is in IGNITION ON mode.
■Instrument cluster brightness adjustment
The instrument cluster brightness levels when the tail lights are on and off can be
adjusted.
■The brightness of the in strument cluster lights
When the tail lights are on, the brightness will change. Ho wever, when the surroundings
are bright (daytime, etc.) turn ing on the tail lights will not change the instrument cluster
brightness.
In addition, the brightness of the instrument cluster lights is automatically adjusted based
on the light sensor detecting ho w bright the surroundings are.
■When disconnecting and reconnecting battery terminals
The trip meter data will be reset.
If the trip meter was displayed last, the od ometer will be displayed after resetting.
■Customization
Setting of sensitivity of the ambient light sensor used for dimming the meter lights can be
changed. (Customizable features: P. 592)
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. 562)

GX460_OM_OM60Q84U_(U)
1854-1. Before driving
4
Driving
●Avoid jerky starts or sudden acceleration.
●Avoid jerky steering and sharp turns, and 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 crosswinds, 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 5 or lower.
●Instability happens more frequently 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. 562)

196
GX460_OM_OM60Q84U_(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 the engine switch in dicator flashes in amber
The system may be malfunctioning. Have th e vehicle inspected by your Lexus dealer,
immediately.
■If the electronic key battery is depleted
 P. 489
■Operation of the engine switch
●If the switch is not pressed shortly and firmly, the engine switch mode may not change
or the engine may not start.
●If attempting to restart the engine immediately after turning the engine switch off, the
engine may not start in some cases. After turning the engine switch off, please wait a
few seconds before restarting the engine.
■If the smart access system with push-button start has been deactivated in a customized
setting
 P. 556
The green indicator light on the engine switch
will flash and a message will be shown on the
multi-information display. Press the engine
switch again while turning the steering wheel
left and right.

403
GX460_OM_OM60Q84U_(U)5-1. Using the air conditio
ning system and defogger
5
Interior features
Heated steering wheel/seat heaters/seat
ventilators

Turns the heated steering wheel on/off
The indicator light comes on when the
heated steering wheel is operating.
: If equipped
Heated 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.
CAUTION
●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 physically 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.
Heated steering wheel (if equipped)

GX460_OM_OM60Q84U_(U)
4295-4. Using the other interior features
5
Interior features
CAUTION
■Using a power outlet (120 V AC)
Observe the following precautions to reduce the risk of injury.
●Use of the power outlet when it is wet with water or snow may result in electrical
shocks and is extremely dangerous. The power outlet must be thoroughly dried
before use.
●Do not allow children to use or play with the power outlet.
●Be careful not to get any part of your body caught in the power outlet lid.
●When using electrical appliances, strictly follow any cautions and notices written on
their labels and in the manufa cturers’ instruction manuals.
●Do not modify, disassemble or repair the power outlet or its inverter in any way. Doing
so may result in unexpected malfunctions or accidents, which could cause serious
damage or injuries. Contact your Le xus dealer for any necessary repairs.
■To prevent injuries and accidents, secure a ll electric appliances before use and do not
use any appliances that may do any of the following (120 V AC):
●Distract the driver while driving, or hamper safe driving.
●Result in a fire or burn injuries due to the appliance rolling, falling or overheating while
driving.
●Emit steam while the windows of the cabin are closed.
■To prevent unexpected accidents, such as electric shocks, do not perform any of the
following actions (120 V AC):
●Using the power outlet for electric heaters while sleeping.
●Contaminating the power outlet with liquid substances or mud.
●Handling electrical appliance plugs at the power outlet with wet hands or feet.
●Inserting foreign objects into the power outlet.
●Using malfunctioning electric appliances.
●Inserting inappropriate or badly fitting plugs into the power outlet.
NOTICE
■To avoid damaging the power ou tlet and the plug (120 V AC)
●Close the power outlet lid when not in use.
●Do not allow foreign objects or liquids to enter the power outlet, as this may cause a
short circuit.
●Do not use plug adaptors to connect too many plugs to the power outlet. (120 V AC)
●After removing a plug, gently close the power outlet lid. (120 V AC)

562
GX460_OM_OM60Q84U_(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 the 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. 87) 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

626Alphabetical index
GX460_OM_OM60Q84U_(U)
Condenser .............................................. 467
Console box ............................................ 410
Cool box .................................................. 423
Cooling system ..................................... 465Engine overheating...........................562
Conversation mirror ........................... 426
Crawl Control .......................................350
Cruise control Cruise control...................................... 229
Dynamic radar cruise control...... 232
Cup holders .............................................. 412
Curtain shield airbags ........................... 36
Current fuel consumption .....................91
Customizable features ....................... 592
DAC (Downhill Assist Control system)................................................... 353
Daytime running light system ..........208
Defogger Front windshield .................................394
Outside rear view mirrors ............ 395
Rear window ....................................... 395
Differential ............................................... 573
Dimension ............................................... 568
Display Multi-information display ..................90
Trip information .......................................91
Warning message .............................526
Do-it-yourself maintenance ............. 457
Doors.......................................................... 102 Back door ............................................... 109
Door glasses ......................................... 154
Door lock ................................................ 102
Open door warning light.............. 520
Outside rear view mirrors ................ 151
Rear door child-protector.............. 105 Driver’s seat position memory.......... 139
Driving ........................................................ 162
AVS switch ........................................... 345
Break-in tips ...........................................163
Correct posture .................................... 28
Procedures ............................................. 162
Winter drive tips ................................. 381
Dynamic radar cruise control ..........232
Eco Driving Indicator .............................94
EDR (Event data recorder)................... 10
Electronic key ........................................... 98 Battery-saving function ......................121
If the electronic key does not operate properly ............................556
Replacing the battery ......................489
Emergency, in case of If the electronic key does not operate properly ............................556
If the engine will not start ...............554
If the vehicle has discharged battery ........................559
If the warning buzzer sounds .................................................. 518
If the warning light turns on ........... 518
If you have a flat tire ..........................540
If you lose your keys......................... 620
If you think something is wrong.....................................................516
If your vehicle becomes stuck......................................................565
If your vehicle needs to be towed .................................................... 510
If your vehicle overheats ................ 562
D
E

627Alphabetical index
GX460_OM_OM60Q84U_(U)
Emergency flashers .............................508
EngineAccessory mode................................. 194
Compartment....................................... 461
Hood ....................................................... 460
How to start the engine ................... 193
Identification number ...................... 570
If the engine will not start............... 554
Ignition switch (engine switch)..... 193
Overheating .........................................562
Engine compartment cover ............. 462
Engine coolant....................................... 465 Capacity ................................................. 572
Checking............................................... 465
Preparing and checking before winter ..................................... 381
Engine immobilizer system .................. 77
Engine oil ................................................. 463 Capacity ................................................ 570
Checking................................................463
Preparing and checking before winter ..................................... 381
Engine switch ...........................................193
Engine switch light ............................... 406
Event data recorder (EDR) ...................10 Flat tire ...................................................... 540
Floor mats....................................................26
Fluid
Automatic transmission .................. 574
Brake........................................................ 575
Steering .................................................. 576
Washer ................................................... 473
Fog lights.................................................... 215 Switch ........................................................ 215
Four-wheel drive system................... 346
Front passenger occupant classification system ........................... 48
Front passenger’s seat belt reminder light ..................................... 520
Front seats ................................................. 126 Adjustment.............................................. 126
Cleaning................................................. 447
Correct driving posture .................... 28
Driving position memory.................139
Head restraints ..................................... 144
Seat heaters .......................................... 404
Seat position memory .......................139
Front turn signal lights ........................ 204 Replacing light bulbs ...................... 500
Turn signal lever ................................. 204
Wattage ................................................. 577F