overheating Lexus ES300h 2017 Owner's Manual

751-2. Hybrid system
ES300h_OM_OM33C75U_(U)
1
For safety and security
NOTICE
■Hybrid battery (traction battery) air intake vent
●Do not place objects that will block the air intake vent. The hybrid battery (traction
battery) may overheat and be damaged.
●Clean the air intake vent regularly to prevent the hybrid battery (traction battery)
from overheating.
●Do not get water or foreign materials in the air intake vent as this may cause a short
circuit and damage the hybrid battery (traction battery).
●Do not carry large amounts of water such as water cooler bottles in the vehicle. If
water spills onto the hybrid battery (traction battery), the battery may be damaged.
Have the vehicle inspected by your Lexus dealer.

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ES300h_OM_OM33C75U_(U)2. Instrument cluster
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); or “Engine Coolant Temp High” is shown on the multi-information display.
In this case, immediately stop the vehicle in a safe place, and check the engine after it
has cooled completely. (
→P. 5 3 3 )

ES300h_OM_OM33C75U_(U)
1594-1. Before driving
4
Driving
WA R N I N G
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When the vehicle is parked
●Do not leave glasses, cigarette lighters, spray cans, or soft drink cans in the vehicle
when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter or spray can, and may lead to a fire.
• The temperature inside the vehicle may cause the plastic lenses and plastic mate- rial of glasses to deform or crack.
• Soft drink cans may fracture, causing the contents to spray over the interior of the vehicle, and may also cause a short circuit in the vehicle’s electrical components.
●Do not leave cigarette lighters in the vehicle. If a cigarette lighter is in a place such as
the glove box or on the floor, it may be lit accidentally when luggage is loaded or the
seat is adjusted, causing a fire.
●Do not attach adhesive discs to the windshield or windows. Do not place containers
such as air fresheners on the instrument panel or dashboard. Adhesive discs or con-
tainers may act as lenses, causing a fire in the vehicle.
●Do not leave a door or window open if the curved glass is coated with a metallized
film such as a silver-colored one. Reflected sunlight may cause the glass to act as a
lens, causing a fire.
●Always apply the parking brake, shift the shif t lever to P, stop the hybrid system and
lock the vehicle.
Do not leave the vehicle unattended while the “READY” indicator is illuminated.
If the vehicle is parked with the shift lever in P but the parking brake is not set, the
vehicle may start to move, possibly leading to an accident.
●Do not touch the exhaust pipes while the “READY” indicator is illuminated or imme-
diately after turning the hybrid system off.
Doing so may cause burns.
■When taking a nap in the vehicle
Always turn the hybrid system off. Otherwise, if you accidentally move the shift lever or
depress the accelerator pedal, this could cause an accident or fire due to hybrid system
overheating. Additionally, if the vehicle is parked in a poorly ventilated area, exhaust
gases may collect and enter the vehicle, leading to death or a serious health hazard.

ES300h_OM_OM33C75U_(U)
1714-2. Driving procedures
4
Driving
■When the steering lock cannot be released
■Steering lock motor overheating prevention
To prevent the steering lock motor from overheating, the motor may be suspended if the
hybrid system is turned on and off repeatedly in a short period of time. In this case, refrain
from operating the hybrid system. After about 10 seconds, the steering lock motor will
resume functioning.
■When “Check Access System with Elec. Key” is displayed on the multi-information dis-
play
The system may be malfunctioning. Have the vehicle inspected by your Lexus dealer
immediately.
■If the “READY” indicator does not come on
In the event that the “READY” indicator does not come on even after performing the
proper procedures for starting the vehicle, contact your Lexus dealer immediately.
■If the hybrid system is malfunctioning
→ P. 7 2
■If the electronic key battery is depleted
→P. 4 8 1
■Operation of the power switch
●If the switch is not pressed shortly and firm ly, the power switch mode may not change or
the hybrid system may not start.
●If attempting to restart the hybrid system immediately after turning the power switch off,
the hybrid system may not start in some cases. After turning the power switch off,
please wait a few seconds before restarting the hybrid system.
■If the smart access system with push-button start has been deactivated in a customized
setting
→P. 5 2 7
■Odometer and trip meter display
When the power switch is turned off, the odometer or trip meter display will extinguish
after approximately 30 seconds. “Steering Lock active” will be displayed on the
multi-information display.
Check that the shift lever is set in P. Press the
power switch while turning the steering wheel
left and right.

ES300h_OM_OM33C75U_(U)
2794-5. Using the driving support systems
4
Driving
■ECB operating sound
ECB operating sound may be heard in the following cases, but it does not indicate that a
malfunction has occurred.
●Operating sound heard from the engine compartment when the brake pedal is oper-
ated.
●Motor sound of the brake system heard from the front part of the vehicle when the
driver’s door is opened.
●Operating sound heard from the engine compartment when one or two minutes
passed after the stop of the hybrid system.
■EPS 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 turing the TRAC and VSC systems off, the systems will be automatically re-
enabled in the following situations:
●When the power switch is turned off
●If only the TRAC system is turned off, the TRAC will turn on when vehicle speed
increases.
If both the TRAC and VSC systems are turned off, automatic re-enabling will not occur
when vehicle speed increases.
■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 P or N (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 turn off in any of the following situations:
●The shift lever is moved to P or N.
●The accelerator pedal is depressed.
●The parking brake is engaged.
●Approximately 2 seconds elapse after the brake pedal is released.
■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 hybrid system off. The EPS system should return to nor-
mal within 10 minutes.

398
ES300h_OM_OM33C75U_(U)6-1. Using the air conditio
ning system and defogger
Heated steering wheel∗/seat heaters∗/
seat ventilators
∗
∗
: 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.
WA R N I N G
●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 prevent minor burns or overheating:
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use the 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 12-volt battery discharge, do not use the functions when the hybrid system
is off.

533
ES300h_OM_OM33C75U_(U)8-2. Steps to take in an emergency
8
When trouble arises
If your vehicle overheats
■If the needle of the engine coolant temperature gauge enters the red zone
Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has
cooled down sufficiently, inspect
the hoses and cooling system for
leaks. Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The coolant level is satisfactory if
it is between the “FULL” and
“LOW” lines on the reservoir.Reservoir
“FULL”
“LOW”
Radiator cap
The following may indicate that your vehicle is overheating.
●The needle of the engine coolant temperature gauge ( →P. 8 6 ) e n t e r s t h e
red zone or a loss of hybrid system power is experienced. (For example, the
vehicle speed does not increase.)
●“Hybrid System Overheated” is shown on the multi-information display.
●Steam comes out from under the hood.
Correction procedures
1
2
3
1
2
4
1
2
3
4

592Alphabetical index
ES300h_OM_OM33C75U_(U)
CareAluminum wheels ..............................435
Exterior....................................................434
Interior ..................................................... 437
Seat belts ............................................... 438
Cargo capacity........................................165
Cargo hooks .......................................... 407
CD player
*............................................. 322
Chains ....................................................... 285
Child restraint system Booster seats, definition ....................53
Booster seats, installation.................. 62
Convertible seats, definition ............53
Convertible seats, installation .........60
Front passenger occupant
classification system .........................46
Infant seats, definition ..........................53
Infant seats, installation .......................60
Installing CRS
with LATCH anchors .................... 58
Installing CRS with seat belts ..........60
Installing CRS with top tether strap .........................63
Child safety ................................................ 52 12-volt battery precautions ...........532
Airbag precautions .............................. 39
Child restraint system .........................53
How your child should wear the seat belt .......................................... 33
Installing child restraints..................... 57
Moon roof precautions...................... 151 Power window lock switch.............145
Power window precautions ........... 147
Rear door child-protectors ............... 111
Removed electronic
key battery precautions .............. 482
Seat belt extender
precautions .......................................... 35
Seat belt precautions .......................... 56
Seat heater precautions .................398
Trunk precautions ................................. 117
Child-protectors ....................................... 111
Cleaning Aluminum wheels .............................. 435
Exterior ................................................... 434
Interior ..................................................... 437
Seat belts................................................438
Clock...........................................................410
Coat hooks ............................................... 414
Condenser.............................................. 458
Console box........................................... 404
Console box light ................................. 404
Consumption screen ..............................99
Cooling system Hybrid system overheating .......... 533
Cruise control Cruise control ..................................... 238
Dynamic radar cruise control ..... 226
Cup holders............................................ 405
Curtain shield airbags ............................ 37
Customizable features ...................... 562
C

594Alphabetical index
ES300h_OM_OM33C75U_(U)
Emergency, in case ofIf a warning buzzer
sounds................................................. 505
If a warning light turns on.............. 505
If a warning message is displayed ........................................... 511
If the 12-volt battery is discharged .........................................529
If the electronic key does not operate properly ........ 527
If the hybrid system will not start ............................................... 525
If you have a flat tire ........................... 515
If you think something is wrong.............................................. 504
If your vehicle becomes
stuck ...................................................... 537
If your vehicle has to be
stopped in an emergency ......... 499
If your vehicle needs
to be towed ......................................500
If your vehicle overheats ............... 533
Emergency flashers ............................. 498
Energy monitor .........................................97 Engine
Accessory mode .................................169
Compartment .......................................451
Hood........................................................ 449
How to start the hybrid system ................................................... 168
Identification number ....................... 542
Ignition switch (power switch) ..... 168
Overheating.........................................533
Power switch. ....................................... 168
Engine compartment cover..............452
Engine coolant Capacity .................................................545
Checking ............................................... 457
Preparing and checking before winter .................................... 284
Engine coolant temperature gauge ........................................................ 86
Engine oil Capacity ................................................. 543
Checking ............................................... 453
Preparing and checking
before winter .................................... 284

596Alphabetical index
ES300h_OM_OM33C75U_(U)
Hands-free system (for cellular phone)
*........................ 349
Head restraints ....................................... 135
Headlights Adaptive Front-lighting System
(AFS) ..................................................... 183
Light switch ............................................ 182
Replacing light bulbs.........................................488, 495
Wattage ................................................. 548
Heaters
Air conditioning system ................................................. 388
Heated steering wheel ................... 399
Seat heaters ......................................... 399
Outside rear view mirrors .............392
High-voltage components .................... 71
Hill-start assist control ........................ 276
Hood .......................................................... 449
Hooks Cargo hooks ........................................407
Coat hooks ............................................ 414
Grocery bag hooks..........................407
Retaining hooks (floor mat) .............28
Horn .............................................................139
Hybrid battery (traction battery) .................................... 71
Hybrid battery (traction battery) air vents .................72 Hybrid system............................................ 67
Emergency shut off system .............. 72
Energy monitor/consumption screen ..................................................... 96
EV drive mode ..................................... 173
High voltage components ................. 71
Hybrid System Indicator ...................88
Hybrid system precautions ............... 71
Hybrid vehicle driving tips ............ 282
If the hybrid system will not start ............................................... 525
Overheating.........................................533
“Power” (ignition) switch ................ 168
Starting the hybrid system.............. 168
Vehicle proximity notification system ..................................................... 68
Hybrid System Indicator ...................... 88
Hybrid transmission .............................. 175 If the shift lever cannot be shifted from P .....................................178
H