engine overheat Lexus GX460 2015 Alphabetical index /

342
GX460_OM_OM60L72U_(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 2 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.

344
GX460_OM_OM60L72U_(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

348
GX460_OM_OM60L72U_(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.

393
GX460_OM_OM60L72U_(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)

501
GX460_OM_OM60L72U_(U)
7When trouble arises
7-1. Essential informationEmergency flashers ..................502
If your vehicle has to be stopped in
an emergency...........................503
7-2. Steps to take in an emergency If your vehicle needs to be towed ................................504
If you think something is wrong ...........................................509
Fuel pump shut off system ....... 510
If a warning light turns on or a warning buzzer
sounds............................................. 511
If a warning message is displayed...................................... 519
If you have a flat tire................... 533
If the engine will not start ........ 546
If the shift lever cannot be shifted from P............................548
If the electronic key does not operate properly ............. 549
If the vehicle battery is discharged ................................. 552
If your vehicle overheats ......... 555
If the vehicle becomes stuck .............................................558

555
GX460_OM_OM60L72U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
Stop the vehicle in a safe place and turn 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 9 ) 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

620Alphabetical index
GX460_OM_OM60L72U_(U)
Condenser ................................................461
Console box ...........................................400
Cool box ....................................................413
Cooling system ..................................... 459Engine overheating.......................... 555
Conversation mirror .............................416
Crawl Control ....................................... 340
Cruise control Cruise control....................................... 218
Dynamic radar cruise control........221
Cup holders ............................................ 402
Curtain shield airbags ........................... 34
Current fuel consumption ................... 83
Customizable features ....................... 586
DAC (Downhill Assist Control system)................................................... 343
Daytime running light system ........... 198
Defogger Front windshield ................................ 384
Outside rear view mirrors ............ 385
Rear window ....................................... 385
Differential ............................................... 567
Dimension ............................................... 562
Display Multi-information display .................. 82
Trip information .....................................83
Warning message .............................. 519
Do-it-yourself maintenance ...............451
Doors............................................................ 94 Back door ............................................. 101
Door glasses ......................................... 146
Door lock .................................................. 94
Open door warning light................ 513
Outside rear view mirrors .............. 143
Rear door child-protector................ 97 Driver’s seat position memory........... 131
Driving ........................................................ 154
AVS switch ........................................... 335
Break-in tips .......................................... 155
Correct posture .................................... 26
Procedures .............................................154
Winter drive tips .................................. 371
Dynamic radar cruise control ........... 221
Eco Driving Indicator ............................ 86
EDR (Event data recorder)................... 10
Electronic key ........................................... 90 Battery-saving function ......................113
If the electronic key does not operate properly ............................549
Replacing the battery ......................483
Emergency, in case of If the electronic key does not operate properly ............................549
If the engine will not start ............... 546
If the shift lever cannot be shifted from P ...................................548
If the vehicle has discharged battery ........................ 552
If the warning buzzer sounds .................................................... 511
If the warning light turns on ............. 511
If you have a flat tire .......................... 533
If you lose your keys...........................614
If you think something is wrong.................................................. 509
If your vehicle becomes stuck..................................................... 558
If your vehicle needs to be towed ...................................................504
If your vehicle overheats ................555
D
E

621Alphabetical index
GX460_OM_OM60L72U_(U)
Emergency flashers ............................. 502
EngineAccessory mode................................. 186
Compartment..................................... 455
Hood ........................................................454
How to start the engine ................... 185
Identification number ...................... 564
If the engine will not start............... 546
Ignition switch (engine switch)..... 185
Overheating ........................................ 555
Engine compartment cover ............. 456
Engine coolant....................................... 459 Capacity ................................................ 566
Checking............................................... 459
Preparing and checking before winter ......................................371
Engine immobilizer system ................. 68
Engine oil ................................................. 457 Capacity ................................................ 564
Checking................................................457
Preparing and checking before winter ......................................371
Engine switch .......................................... 185
Engine switch light ............................... 396
Event data recorder (EDR) ...................10 Flat tire ...................................................... 533
Floor mats.................................................... 24
Fluid
Automatic transmission ................. 568
Brake........................................................569
Steering .................................................. 570
Washer ................................................... 467
Fog lights.................................................. 204 Switch ................................................. 204
Four-wheel drive system................... 336
Front passenger occupant classification system ............................46
Front passenger’s seat belt reminder light ....................................... 513
Front seats .................................................. 118 Adjustment............................................... 118
Cleaning................................................... 441
Correct driving posture .................... 26
Driving position memory...................131
Head restraints .....................................136
Seat heaters .......................................... 394
Seat position memory .........................131
Front turn signal lights .......................... 194 Replacing light bulbs ....................... 494
Turn signal lever ...................................194
Wattage ................................................... 571F

624Alphabetical index
GX460_OM_OM60L72U_(U)
Meter .............................................................79Indicators................................................... 74
Instrument panel light control ........ 80
Meters......................................................... 79
Multi-information display .................. 82
Warning lights ........................................ 74
Micro dust and pollen filter ..............385
Mirrors Inside rear view mirror ....................... 141
Outside rear view mirror defoggers .......................................... 385
Outside rear view mirrors .............. 143
Vanity mirrors ....................................... 415
Moon roof..................................................149 Jam protection function ................... 150
Operation ............................................... 149
MP3 disc
*
Multi-information display ..................... 82 Switching the display...........................83
Trip information .....................................83
Multi-terrain Monitor ......................... 307
Multi-terrain Select.............................. 302
Navigation system
*
Odometer ................................................... 79
Off-road precautions ..........................374
Oil Engine oil ............................................... 564
Front differential oil ........................... 567
Rear differential oil ............................ 567
Transfer.................................................. 568
Opener Back door................................................102
Fuel filler door........................................ 216
Hood........................................................ 454
Outside rear view mirrors .................. 143 Adjusting and folding ........................ 143
Blind Spot Monitor .............................351
Outside rear view mirror defoggers...........................................385
Outside temperature display ............. 86
Overheating, Engine .......................... 555
Parking assist sensors (intuitive parking assist).................. 238
Parking assist monitor .........................257
Parking brake .......................................... 195 Operation................................................195
Parking brake engaged warning buzzer ................................. 521
Personal lights ....................................... 396 Switch ...................................................... 397
Wattage ................................................... 571
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