engine overheat Lexus GX460 2014 Using the air conditioning system and defogger / LEXUS 2014 GX460 (OM60K80U) User Guide

338
GX460_OM_OM60K80U_(U)4-5. Using the driving support systems
■When the Crawl Control system is operated continuously
This may cause the brake actuator to overheat. In this case, the Crawl Control system will
stop operating, a buzzer will sound, the Crawl
Control indicator will turn off after flashing
and the “TRAC OFF” will be shown on the mult i-information display. In this case, quickly
stop the vehicle in a safe place and give the actuator adequate time to cool off. Refrain
from using the system until the message goes off. (The vehicle can be driven normally
during this time.)
■If the automatic transmission system overheats
The system will cease operation, a buzzer will sound and a warning message will be dis-
played to alert the driver. Stop the vehicle in a safe place until the warning message turns
off. ( P. 5 1 4 )
■Sounds and vibrations caused by the Crawl Control system
●A sound may be heard from the engine compartment when the engine is started or just
after the vehicle begins to move. This sound does not indicate that a malfunction has
occurred in Crawl Control system.
●Either of the following conditions may occu r when the Crawl Control system is operat-
ing. None of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■If the slip indicator comes on...
It may indicate a malfun ction in the system. Consult your Lexus dealer.
CAUTION
■When using Crawl Control
Do not rely solely on the Crawl Control. This function does not extend the vehicle’s
performance limitations. Always thoroughly check the road conditions, and drive
safely.
■These conditions may cause the system not to operate properly
When driving on the following surfaces, the sy stem may not be able to maintain a fixed
low speed, which may re sult in an accident:
●Extremely steep inclines.
●Extremely uneven surfaces.
●Snow-covered roads, or other slippery surfaces.

340
GX460_OM_OM60K80U_(U)4-5. Using the driving support systems
■Operating tips
The system will operate when the shift lever is
in a position other than P, however to make
effective use of the system it is recommended that the shift lever be shifted to 2 or 1 range
of S mode.
■If the four-wheel drive control switch is in H4
The system does not operate.
■When the downhill assist control system is operated continuously
This may cause the brake actuator to overheat. In this case, the downhill assist control
system will stop operating, a buzzer will sound and the downhill assist control system
indicator will start flashing, and the “TRAC O FF” will be shown on the multi-information
display. Refrain from using the system until the downhill assist control system indicator
stays on and the message goes off. (The vehicl e can be driven normally during this time.)
■Sounds and vibrations caused by the downhill assist control system
●A sound may be heard from the engine compartment when the engine is started or just
after the vehicle begins to move. This sound does not indicate that a malfunction has
occurred in downhill assist control system.
●Either of the following conditions may occur when the downhill assist control system is
operating. None of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■System malfunction
●The downhill assist control system indicator does not come on when the engine switch
is turned to IGNITION ON mode.
●The downhill assist control system indicato r does not come on when the “DAC” switch
is pressed.
●The slip indicator comes on.
In the above cases, have your vehicle checked by your Lexus dealer.
CAUTION
■When using downhill assist control system
Do not rely overmuch on the downhill assist control system. This function does not
extend the vehicle’s performance limitations. Always thoroughly check the road condi-
tions, and drive safely.
■The system may not operate on the following surfaces, which may lead to an accident
causing death or serious injury
●Slippery surfaces such as wet or muddy roads
●Icy surface
●Unpaved roads

344
GX460_OM_OM60K80U_(U)4-5. Using the driving support systems
■Sounds and vibrations caused by the ABS/Multi Terrain ABS, brake assist, TRAC/
Active TRAC, VSC/Trailer Sway Control
and hill-start assist control systems
●A sound may be heard from the engine compartment when the engine is started or just
after the vehicle begins to move. This sound does not indicate that a malfunction has
occurred in any of these systems.
●Any of the following conditions may occur when the above systems are operating.
None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
• The brake pedal may pulsate slightly afte r the ABS/Multi Terrain ABS is activated.
• The brake pedal may move down slightly after the ABS/Multi Terrain ABS is acti- vated.
■Reactivation of the TRAC or Active TRAC/VSC/Trailer Sway Control systems after
turning off the engine
Turning off the engine after turning off the TRAC or Active TRAC/VSC/Trailer Sway
Control systems will automatically re-enabled them.
■Reactivation of the TRAC or Active TRAC system linked to vehicle speed
When only the TRAC or Active TRAC system is turned off, the TRAC or Active TRAC
system will turn on when vehicle speed increases. However, when both TRAC or Active
TRAC and VSC/Trailer Sway Control systems are turned off, the systems will not turn on
even when vehicle speed increases.
■When the brake system operates continuously
The brake actuator may overheat. In this case, the TRAC or Active TRAC and hill-start
assist control systems will stop operating, a buzzer will sound and the “TRAC OFF” will
be shown on the multi-information display. Refrain from using the system until the mes-
sage goes off. (There is no proble m with continuing normal driving.)
■If the slip indicator comes on...
It may indicate a malfunction in the TRAC /Active TRAC, VSC/Trailer Sway Control or
hill-start assist control system. Consult your Lexus dealer.

389
GX460_OM_OM60K80U_(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 heater s 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 an d 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 (s leeping drugs, cold
remedies, etc.)
●Observe the following precautions to prevent 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 uneven surface on the seat and do not stick
sharp objects (needles, nails, etc.) into the seat.
●To prevent battery discharge, do not use the functions when the engine is off.
Heated steering wheel (if equipped)

497
GX460_OM_OM60K80U_(U)
7When trouble arises
7-1. Essential informationEmergency flashers .................. 498
If your vehicle has to be stopped in an emergency .... 499
7-2. Steps to take in an emergency If your vehicle needs to be towed ............................... 500
If you think something is wrong .......................................... 505
Fuel pump shut off system ......506
If a warning light turns on or a warning buzzer
sounds.......................................... 507
If a warning message is displayed...................................... 514
If you have a flat tire................... 527
If the engine will not start ........540
If the shift lever cannot be shifted from P............................ 542
If the electronic key does not operate properly ............. 543
If the vehicle battery is discharged ................................. 545
If your vehicle overheats .........548
If the vehicle becomes stuck .............................................. 551

548
GX460_OM_OM60K80U_(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 sufficiently, 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. 7 7 ) e n t e r s t h e
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

609Alphabetical index
GX460_OM_OM60K80U_(U)
Bottle holders ......................................... 399
BrakeFluid............................................................ 561
Parking brake.......................................... 191
Warning light ...................................... 507
Brake assist ...............................................341
Break-in tips............................................. 150
Brightness control Instrument panel light control ..................................................... 78
BSM (Blind Spot Monitor)................ 347
Care ................................................ 434, 437 Aluminum wheels ..............................434
Exterior....................................................434
Interior ..................................................... 437
Seat belts ............................................... 438
Cargo hooks .......................................... 402
Center differential................................ 332
CD player
*
Chains ....................................................... 366
Child restraint system............................ 52 Booster seats, definition ....................53
Booster seats, installation....................61
Convertible seats, definition ............ 53
Convertible seats, installation ............................................. 58
Installation with LATCH system ..................................................... 57
Installing CRS with seat belts ......... 58
Installing CRS with top straps..................................... 62 Infant seats, definition.......................... 53
Infant seats, installation....................... 58
Child safety .................................................. 51 Airbag precautions...............................37
Back door precautions...................... 101
Battery precautions ..............460, 547
Child restraint system......................... 52
Glass hatch precaution ................... 105
How your child should wear the seat belt .......................................... 30
Installing child restraints .................... 56
Moon roof precautions ....................148
Power window lock switch............. 142
Power window precautions ........... 144
Rear door child-protectors ............. 95
Removed key battery precautions ...................................... 480
Seat belt precautions ............................ 31
Seat heater precautions .................390
Child-protectors ..................................... 95
Cleaning Aluminum wheels .............................. 434
Exterior ................................................... 434
Interior ..................................................... 437
Seat belts................................................438
Coat hooks ............................................... 417
Compass ................................................... 419
Condenser...............................................457
Console box ........................................... 396
Cool box .................................................. 409
Cooling system ..................................... 455 Engine overheating ..........................548
Conversation mirror............................. 412
C
*:For vehicles with a navigation system or a multimedia system, refer to the
“NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.

610Alphabetical index
GX460_OM_OM60K80U_(U)
Crawl Control ....................................... 336
Cruise controlCruise control........................................214
Dynamic radar cruise control........ 217
Cup holders ............................................ 398
Curtain shield airbags ........................... 34
Current fuel consumption .....................81
Customizable features ....................... 578
DAC (Downhill Assist Control system)................................................... 339
Daytime running light system ............194
Defogger Front windshield ................................ 380
Outside rear view mirrors .............. 381
Rear window ......................................... 381
Differential ............................................... 559
Dimension ............................................... 554
Display Multi-information display ................. 80
Trip information ...................................... 81
Warning message .............................. 514
Do-it-yourself maintenance ............. 447
Doors............................................................ 92 Back door ............................................. 99
Door glasses ..........................................142
Door lock .................................................. 92
Open door warning light.............. 509
Outside rear view mirrors .............. 139
Rear door child-protector................95
Driver’s seat position memory ......... 128 Driving ........................................................150
AVS switch ............................................. 331
Break-in tips ........................................... 176
Correct posture .................................... 26
Procedures ............................................ 150
Winter drive tips ................................ 366
Dynamic radar cruise control ........... 217
Eco Driving Indicator ............................ 84
Electronic key ........................................... 88 Battery-saving function ..................... 110
If the electronic key does not operate properly ............................ 543
Replacing the battery ...................... 479
Emergency, in case of If the electronic key does not operate properly ............................ 543
If the engine will not start ...............540
If the shift lever cannot be shifted from P ................................... 542
If the vehicle has discharged battery ........................545
If the warning buzzer sounds ................................................. 507
If the warning light turns on ..........507
If you have a flat tire .......................... 527
If you lose your keys.........................604
If you think something is wrong.................................................. 505
If your vehicle becomes stuck....................................................... 551
If your vehicle needs to be towed .................................................. 500
If your vehicle overheats ................548
D
E

611Alphabetical index
GX460_OM_OM60K80U_(U)
Emergency flashers ............................. 498
EngineAccessory mode................................. 182
Compartment....................................... 451
Hood ....................................................... 450
How to start the engine ..................... 181
Identification number ...................... 556
If the engine will not start............... 540
Ignition switch (engine switch)....... 181
Overheating ........................................ 548
Engine compartment cover ...............451
Engine coolant....................................... 455 Capacity ................................................ 558
Checking............................................... 455
Preparing and checking before winter ................................... 366
Engine immobilizer system ................. 66
Engine oil ................................................. 453 Capacity ................................................ 556
Checking................................................453
Preparing and checking before winter ................................... 366
Engine switch ............................................ 181
Engine switch light ............................... 392
EDR .................................................................10 Flat tire .......................................................527
Floor mats.................................................... 24
Fluid
Automatic transmission ................. 560
Brake..........................................................561
Steering .................................................. 562
Washer ................................................... 463
Fog lights.................................................. 200 Switch ................................................. 200
Wattage .................................................563
Four-wheel drive system................... 332
Front passenger occupant classification system ............................45
Front passenger’s seat belt reminder light ..................................... 509
Front position lights ............................... 192 Light switch............................................. 192
Wattage .................................................563
Front seats .................................................. 115 Adjustment............................................... 115
Cleaning................................................. 437
Correct driving posture .................... 26
Driving position memory.................128
Head restraints ..................................... 132
Seat heaters ..........................................390
Seat position memory .......................128
Front turn signal lights ..........................190 Replacing light bulbs .......................490
Turn signal lever .................................. 190
Wattage .................................................563F
*:For vehicles with a navigation system or a multimedia system, refer to the
“NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.

614Alphabetical index
GX460_OM_OM60K80U_(U)
Meter ............................................................. 77Indicators................................................... 72
Instrument panel light control ......... 78
Meters......................................................... 77
Multi-information display ................. 80
Warning lights ........................................ 72
Micro dust and pollen filter ............... 381
Mirrors Inside rear view mirror ......................137
Outside rear view mirror defoggers ............................................ 381
Outside rear view mirrors .............. 139
Vanity mirrors ......................................... 411
Moon roof..................................................145 Jam protection function ................... 143
Operation ............................................... 145
MP3 disc
*
Multi-information display ..................... 80 Switching the display............................ 81
Trip information ...................................... 81
Multi-terrain Monitor ......................... 303
Multi-terrain Select.............................. 298
Navigation system
*
Odometer ................................................... 77
Off-road precautions ......................... 369
Oil Engine oil ...............................................556
Front differential oil ...........................559
Rear differential oil ............................559
Transfer.................................................. 560
Opener Back door................................................. 99
Fuel filler door........................................210
Hood........................................................450
Outside rear view mirrors .................. 139 Adjusting and folding ........................139
Blind spot monitor ............................ 347
Outside rear view mirror defoggers............................................ 381
Outside temperature display ............. 84
Overheating, Engine .......................... 548
Parking assist sensors (intuitive parking assist)...................234
Parking assist monitor ........................ 253
Parking brake ........................................... 191 Operation................................................. 191
Parking brake engaged warning buzzer ............................... 507
Personal lights ....................................... 392 Switch ...................................................... 393
Wattage .................................................563
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