2020 Lexus GS F engine overheat

302
GS350_GS F_OM_OM30J07U_(U)4-5. Using the driving support systems
■Sounds and vibrations caused by the ABS,
brake assist, VSC, TRAC, Hill-start assist
control and VGRS systems
●A sound may be heard from the engine compartment when the brake pedal is
depressed repeatedly, 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 sys-
tems.
●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 afte r the vehicle comes to a stop.
• The brake pedal may pulsate slig htly after the ABS is activated.
• The brake pedal may move down s lightly after the ABS is activated.
■EPS, VGRS and DRS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may be heard.
This does not indicate a malfunction.
■Automatic reactivation of TRAC and VSC systems
After turning the TRAC and VSC systems off, the systems will be automatically re-
enabled in the following situations:
●When the engine swit ch is turned off
●If only the TRAC system is turned off, the TRAC will turn on when vehicle speed
increases
If both TRAC and VSC systems are turned off, automatic re-enabling will not occur
when vehicle speed increases.
■Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from overheating
when there is frequent steering input over an extended period of time. The steering
wheel may feel heavy as a result . Should this occur, refrain from excessive steering input
or stop the vehicle and turn the engine off. The EPS system should return to normal
within 10 minutes.
■Operating conditions of hill-start assist control
When the following four conditions are met, the hill-start assist control will operate;
●The shift lever is in a position other than N or P (when starting off forward/backward on
an upward incline).
●The vehicle is stopped.
●The accelerator pedal is not depressed.
●The parking brake is not engaged.
■Automatic system cancelation of hill-start assist control
The hill-start assist control will be cancel ed in any of the following situations;
●The shift lever is shifted to N or P.
●The accelerator pedal is depressed.
●The parking brake is engaged.
●Approximately 2 seconds elapse after the brake pedal is released.

332
GS350_GS F_OM_OM30J07U_(U)5-2. Using the air conditioning system and defogger
Heated steering wheel/seat heaters/seat ventilators
Turns the heated steering wheel on/off
The indicator light comes on when the
heater is operating.
●The heated steering wheel can be used when the engine switch is in IGNITION ON
mode.
●The heated steering wheel will automatically turn off after about 30 minutes.
: If equipped
Heated steering wheel and seat heaters heat the side grips of the steering
wheel and seats, respectively. Seat ventilators maintain good airflow by blow-
ing 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 or seats when the heater is on:
• Babies, small children, the elderly, th
e 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
●To prevent damage to the seat heaters/seat ventilators, 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)

423
GS350_GS F_OM_OM30J07U_(U)
7When trouble arises
7-1. Essential informationEmergency flashers................... 424
If your vehicle has to be stopped in an
emergency .................................425
If the vehicle is trapped in rising water ................................426 7-2. Steps to take in an
emergency
If your vehicle needs to be towed................................ 427
If you think something is wrong ................ 433
Fuel pump shut off system ...... 434
If a warning light turns on or a warning buzzer
sounds.......................................... 435
If a warning message is displayed..................................... 442
If you have a flat tire (vehicles with spare tire) ......................... 473
If you have a flat tire (vehicles without spare tire)...................484
If the engine will not start ........498
If the parking brake cannot be released ............................... 500
If the electronic key does not operate properly .....................502
If the vehicle battery is discharged ................................ 505
If your vehicle overheats .........509
If the vehicle becomes stuck .............................................. 513

4487-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
(If equipped)
Indicates that the LKA (Lane-Keeping Assist) system has
determined that the driver does not have their hands on
the steering wheel while the steering control function is
on If the driver operates the steering wheel only a small
amount, the system may be unable to detect the steer-
ing wheel operations and this warning may be dis-
played.
A buzzer also sounds.
 Firmly hold the steering wheel.
(If equipped)
Indicates that steering control function is temporarily
canceled due to the LKA (Lane-Keeping Assist) system
determining that the driver does not have their hands on
the steering wheel while the steering control function is
on
If the driver operates the steering wheel only a small
amount, the system may be unable to detect the steer-
ing wheel operations and this warning may be dis-
played.
 Firmly hold the steering wheel.
Indicates that the parking brake system is overheating
A buzzer also sounds.
 Do not use the parking brake until the message dis-
appears.
Indicates an engine malfunction
A buzzer also sounds.
 Have the vehicle inspected by your Lexus dealer.
Warning messageDetails/Actions
(U.S.A.) (Canada)
(U.S.A.) (Canada)

509
GS350_GS F_OM_OM30J07U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
●The needle of the engine coolant temperature gauge (P. 92, 98) enters 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 is coming from under the hood.
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 cooling
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.
Correction procedures
1
2
3
1
2

580Alphabetical index
GS350_GS F_OM_OM30J07U_(U)
Child restraint system............................ 59Booster seats, definition ....................59
Booster seats, installation.................. 67
Convertible seats, definition ............59
Convertible seats, installation .........65
Front passenger occupant classification system ......................... 52
Infant seats, definition ..........................59
Infant seats, installation .......................65
Installing CRS with LATCH anchors ..................... 64
Installing CRS with seat belts ..........65
Installing CRS with top tether strap .........................68
Child safety ................................................ 58 Airbag precautions .............................. 44
Battery precautions .............392, 508
Child restraint system .........................59
How your child should wear the seat belt ................................. 37, 38
Installing child restraints..................... 63
Moon roof precautions.................... 186
Power window lock switch .............. 181
Power window precautions .......... 183
Rear door child-protectors ........... 146
Removed electronic key battery precautions.................412
Seat belt comfort guide ..................... 37
Seat belt extender precautions ......40
Seat belt precautions .......................... 62
Seat heater precautions.................. 332
Trunk precautions............................... 152 Child-protectors .................................... 146
Cleaning ....................................... 362, 367
Aluminum wheels .............................. 363
Exterior ................................................... 362
Interior ..................................................... 367
Seat belts................................................368
Clock................................................. 93, 347
Coat hooks ............................................. 352
Condenser.............................................. 389
Console box ............................................. 341
Console box light ................................... 341
Consumption screen ............................ 134
Cooling system ..................................... 388 Engine overheating ......................... 509
Consumption screen ............................ 133
Cruise control Cruise control ..................................... 278
Dynamic radar cruise control with full-speed range ................... 266
Cup holders.............................................342
Curtain shield airbags ............................ 42
Customizable features .......................542
Daytime running light system...........223
Defogger Front windshield................................. 324
Outside rear view mirrors ............ 324
Rear window........................................ 324
Differential Front differential ................................. 523
Rear differential................................... 524
D

582Alphabetical index
GS350_GS F_OM_OM30J07U_(U)
Eco drive mode ...................................... 281
Eco Driving Indicator...............................91
Eco driving meter .................................... 98
EDR (Event data recorder) ...................10
Electric Power Steering (EPS) ....... 298Function ................................................. 298
Warning light .......................................436
Warning message ............................. 442
Electronic key ......................................... 138 Battery-saving function .................... 158
If the electronic key does not operate properly............................ 502
Replacing the battery .......................... 411
Emergency, in case of If a warning buzzer sounds...........435
If a warning light turns on...............435
If a warning message is displayed ........................................ 442
If the electronic key does not operate properly ....... 502
If the engine will not start............... 498
If the vehicle is trapped in rising water ........................................426
If the parking brake cannot be released ....................... 500
If the vehicle battery is discharged ........................................ 505
If you have a flat tire ..............473, 484
If you think something is wrong...............................................433
If your vehicle becomes stuck ...... 513
If your vehicle has to be stopped in an emergency .............................425
If your vehicle needs to be towed ....................................... 427
If your vehicle overheats ............... 509 Emergency flashers .............................424
Emergency tire puncture repair
kit ............................................................. 484
Engine Accessory mode ............................... 204
Compartment ...................................... 381
Engine switch ...................................... 203
Hood........................................................ 378
How to start the engine.................. 203
Identification number........................ 518
Ignition switch (engine switch.................................. 203
Overheating........................................ 509
Engine compartment cover............. 383
Engine coolant ...................................... 388 Capacity................................................. 522
Checking .............................................. 388
Preparing and checking before winter ....................................305
Engine coolant temperature gauge .............................................. 92, 100
Engine immobilizer system .................. 77
Engine oil ................................................. 385 Capacity...................................................519
Checking ...............................................385
Oil level warning message ........... 442
Oil pressure warning message........................... 442
Preparing and checking before winter ....................................305
E

588Alphabetical index
GS350_GS F_OM_OM30J07U_(U)
Outer foot lightsOuter foot lights ................................. 337
Replacing light bulbs ..........................421
Wattage ................................................. 528
Outside rear view mirrors .................. 177 Adjusting and folding......................... 177
Blind Spot Monitor........................... 286
Linked mirror function when reversing ..................................179
Mirror position memory .................. 166
Outside rear view mirror defoggers ............................ 324
Outside temperature display ...93, 100
Overheating, Engine ..........................509
Paddle shift switches ............................ 210
Parking assist sensors (intuitive parking assist)
*
Parking brake........................................... 217 If the parking brake cannot be released ....................... 500
Operation ................................................ 217
Parking brake engaged warning buzzer ............................... 442
Parking brake engaged warning message ........................... 442
Parking lights .......................................... 222 Light switch ........................................... 222
Replacing light bulbs ..........................421
Welcome light illumination control ......................... 144 PCS (Pre-Collision System).............245
Function .................................................. 245
Warning light ....................................... 436
Warning message............................. 442
Personal lights ....................................... 338
Power easy access system ................. 166
Pop-up display ................................. 111, 123
Power outlets ......................................... 348
Power steering (Electric Power Steering system)................................ 298 Warning light ....................................... 436
Warning message............................. 442
Power trunk opener and closer ....... 149
Power windows........................................ 181 Door lock linked window operation ...........................182
Jam protection function..................... 181
Operation................................................. 181
Window lock switch ........................... 181
Pre-Collision System (PCS).............245 Function .................................................. 245
Warning light ....................................... 436
Warning message............................. 442
P