2016 Lexus GS450h heating

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GS450h_OM_OM30E99U_(U)
5-2. Using the air conditioning system and defogger
■When the outside temperature exceeds 75°F (24°C) and the air conditioning system
is on
●In order to reduce the air conditioning po wer consumption, the air conditioning system
may switch to recirculated air mode automa tically. This may also reduce fuel consump-
tion.
●Recirculated air mode is selected as a default mode when the power switch is turned
on.
●It is possible to switch to outside air mode at any time by pressing .
■Automatic mode for air intake control
In automatic mode, the system detects exhaust gas and other pollutants and automati-
cally switches between outside air and recirculated air modes.
When the dehumidification function is off, and the fan is operating, turning automatic
mode on will activate the dehumidification function.
■Operation of the air conditioning system in Eco drive mode
In the Eco drive mode, the air conditioning system is controlled as follows to prioritize
fuel efficiency:
●Engine speed and compressor operation controlled to restrict heating/cooling capac-
ity
●Fan speed restricted when automatic mode is selected
To improve air conditioning performance, perform the following operations:
●Turn off eco air conditioning mode
●Adjust the fan speed
●Turn off Eco drive mode ( P. 2 5 6 )
■Eco air conditioning mode
When Eco drive mode is selected using the drive mode select switch, eco air condition-
ing mode turns on.
When a drive mode other than Eco drive mode is selected, eco air conditioning mode
may turn off.
■When the S-FLOW mode operates
If air flows to the driver’s seat only, the temperature setting for the front passenger’s seat
is not displayed.
■When the outside temperature is low
The dehumidification function may not operat e even when “A/C” on the option control
screen is selected.
■Ventilation and air conditioning odors
●To let fresh air in, set the air conditio ning system to the outside air mode.
●During use, various odors from inside and outside the vehicle may enter into and accu-
mulate in the air conditioning system. This may then cause odor to be emitted from the
vents.
●To reduce potential odors from occurring:
• It is recommended that the air conditioning system be set to outside air mode prior to turning the vehicle off.
• The start timing of the blower may be dela yed for a short period of time immediately
after the air conditioning system is started in automatic mode.

299
GS450h_OM_OM30E99U_(U)5-2. Using the air conditio ning system and defogger
5
Interior features
Heated steering wheel/seat heaters/seat ventila-
tors
Heated steering wheel and seat heater s 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 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 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
●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 12-volt battery discharge, do not use the functions when the hybrid system
is off.

GS450h_OM_OM30E99U_(U)
3015-2. Using the air conditioning system and defogger
5
Interior features
●Modes and indicators
The mode can be changed by pressing the switch.
*: When automatic mode is selected, the level automatically changes depending on the
air conditioning settings.
■The seat heaters/seat ventilators can be used when
The power switch is in ON mode.
■Automatic operation of the seat heater during Eco drive mode
Eco drive mode controls the heating operat ions and fan speed of the air conditioning
system to enhance fuel efficiency. If the driv ing mode select switch is switched to Eco
drive mode in cold temperatures, the seat he ater may be automatically operated to assist
heating performance.
■Automatic operation during S-FLOW mode
The front seat heater and ventilator or the rear seat heater may automatically turn off
when S-FLOW mode is turned on during automatic mode. ( P. 2 8 6 )
■Button lock function (vehicle s with rear control panel)
To prevent inadvertent operation, some buttons on the rear armrest can be locked.
(  P. 2 9 8 )
■When the switch is disabled (vehicles with rear control panel)
When the rear control panel switch cannot be operated even though the button lock
function is released, check whether the sw itch is disabled due to selecting on
Remote Touch screen. ( P. 2 9 2 )
■Rear control panel illumination off functi on (vehicles with rear control panel)
Control panel illumination on the re ar armrest can be turned off. (P. 2 9 8 )
■Customization
The automatic mode settings for the front seat heaters and ventilators or the rear seat
heaters can be changed. (Customizable features: P. 4 9 1 )
Mode“AUTO” indicator lightLevel indicator lights
OffOffOff
Automatic*On3 to 1, or off
HiOff3
MidOff2
LoOff1

4147-2. Steps to take in an emergency
GS450h_OM_OM30E99U_(U)
Indicates that the parking brake system is overheatingA 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.
Indicates an engine malfunction
A buzzer also sounds.
 Have the vehicle inspected by your Lexus dealer.
Indicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system; or,
• The seat belt pretensioner system
A buzzer also sounds.
 Have the vehicle inspected by your Lexus dealer.
Wa r n i n g m e s s a g eDetails/Actions
(U.S.A.) (Canada)
(U.S.A.) (Canada)
(U.S.A.) (Canada)

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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. 86) enters the red
zone or a loss of hybrid system power is experienced. (For example, the vehi-
cle speed does not increase.)
●“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” or
“Hybrid System Overheated Reduced Output Power” ( P. 406) is shown on
the multi-information display.
●Steam comes out from under the hood.
■If the needle of the engine coolant temperature gauge enters the red zone
or “Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display
Stop the vehicle in a safe place and tu rn 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 following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

526Alphabetical index
GS450h_OM_OM30E99U_(U)
Child restraint system............................ 53Booster seats, definition ....................53
Booster seats, installation....................61
Convertible seats, definition ............53
Convertible seats, installation .........59
Front passenger occupant classification system ......................... 46
Infant seats, definition .......................... 53
Infant seats, installation .......................59
Installing CRS with LATCH anchors .................... 58
Installing CRS with seat belts ..........59
Installing CRS with top tether strap ......................... 62
Child safety ................................................ 52 12-volt battery precautions ........................... 359, 456
Airbag precautions ..............................38
Child restraint system ......................... 53
How your child should wear the seat belt ................................... 31, 32
Installing child restraints..................... 57
Moon roof precautions.................... 163
Power window lock switch ............ 158
Power window precautions .......... 160
Rear door child-p rotectors ............123
Removed electronic key battery precautions...............378
Seat belt comfort guide .......................31
Seat belt extender precautions ...... 34
Seat belt precautions ..........................56
Seat heater precautions..................299
Trunk precautions............................... 129 Child-protectors .................................... 123
Cleaning ....................................... 332, 336
Aluminum wheels .............................. 333
Exterior ................................................... 332
Interior ..................................................... 336
Seat belts................................................ 337
Clock........................................................... 313
Coat hooks ...............................................318
Condenser .............................................. 355
Console box ........................................... 306
Console box light ................................. 307
Consumption screen ............................. 110
Coolant .................................................... 354 Capacity ................................................... 471
Checking ............................................... 354
Preparing and checking before winter.....................................................274
Cooling system ..................................... 354 Hybrid system overheating .......... 457
Consumption screen ............................ 107
Cruise control Cruise control ..................................... 253
Dynamic radar cruise control with full-speed range ..................... 241
Cup holders............................................ 307
Curtain shield airbags ............................36
Customizable features ........................ 491

528Alphabetical index
GS450h_OM_OM30E99U_(U)
Eco drive mode ..................................... 256
EDR (Event data recorder) ...................10
Electric motor (traction motor) ......... 66
Electric Power Steering (EPS) ....... 267Function .................................................. 267
Warning light ........................................ 401
Warning message ............................ 406
Electronic key ........................................... 116 Battery-saving function .................... 135
If the electronic key does not operate properly.............................. 451
Replacing the battery ....................... 377
Emergency, in case of If a warning buzzer sounds.......... 400
If a warning light turns on.............. 400
If a warning message is displayed ....................................... 406
If the 12-volt battery is discharged .........................................453
If the electronic key does not operate properly ......... 451
If the hybrid system will not start........................................446
If the parking brake cannot be released........................449
If the shift lever cannot be shifted from P ........... 448
If you have a flat tire .......................... 437
If you think something is wrong.............................................. 399
If your vehicle becomes stuck ..... 462
If your vehicle has to be stopped in an emergency .............................393
If your vehicle needs to be towed .......................................394
If your vehicle overheats ................ 457 Emergency flashers ............................ 392
Energy monitor ...................................... 108
Engine
Accessory mode .................................. 181
Compartment ..................................... 349
Engine switch ....................................... 180
Hood........................................................ 347
How to start the hy brid system ... 180
Identification number ....................... 467
Ignition switch (power switch) ................................. 180
Overheating......................................... 457
Power switch ........................................ 180
Engine compartment cover............. 350
Engine coolant ...................................... 354 Capacity ................................................... 471
Checking ............................................... 354
Preparing and checking before winter .....................................274
Engine coolant temperature gauge ........................................................ 86
Engine oil ................................................... 351 Capacity ................................................. 469
Checking .................................................351
Oil level warning message ...........406
Oil pressure warning message...........................406
Preparing and checking before winter .....................................274
Engine oil maintenance data ........... 340
E

530Alphabetical index
GS450h_OM_OM30E99U_(U)
Hands-free system (for cellular phone)
*
HD Radio® system*
Head restraints ....................................... 148
Headlight cleaner..................... 205, 207
Headlights ................................................. 197 Adaptive Front-lighting System (AFS) .................................... 198
Headlight leveling warning message .......................... 406
Light switch .............................................197
Replacing light bulbs ....................... 388
Headlights aim ............................. 384, 517
Head-up display....................................... 101
Heated steering wheel ....................... 299
Heaters Air conditioning system ................. 285
Heated steering wheel ................... 300
Seat heaters ......................................... 300
Outside rear view mirrors .............. 291
High-voltage components .................. 70
Hood .......................................................... 347 Open ........................................................ 347
Warning message ............................ 406
Hooks Cargo hooks ......................................... 310
Coat hooks ............................................ 318
Luggage hook ...................................... 310
Retaining hooks (floor mat) ............. 26 Horn.............................................................. 151
Hybrid battery (traction battery)
Location .................................................... 70
Specification .........................................468
Hybrid battery (traction battery) air vents .....................................................70
Hybrid system............................................66 Emergency shut off system ............... 71
Energy monitor/consumption screen.......................107
EV drive mode .................................... 185
High voltage components ............... 70
Hybrid System Indicator ................... 90
Hybrid system precautions ............. 70
Hybrid vehicle driving tips .............272
If the hybrid system will not start ....................................... 446
Overheating......................................... 457
Power (ignition) switch.................... 180
Regenerative braking ..........................67
Starting the hybrid system.............. 180
Vehicle proximity notification system ......................................................67
Hybrid System Indicator ...................... 90
Hybrid transmission .............................. 187 If the shift lever cannot be shifted from P ............ 448
Paddle shift switches......................... 189
S mode..................................................... 190
H