ignition Lexus GS350 2020 Service Manual

GS350_GS F_OM_OM30J07U_(U)
3355-2. Using the air conditioning system and defogger
5
Interior features
■Seat ventilators (without seat heaters) (if equipped)
Seat ventilator switches
Level indicator lights
The seat ventilator fan speed level is
displayed.
●Modes and indicators
The mode changes each time the switch is pressed as follows:
■The seat heaters/seat vent ilators can be used when
The engine switch is in IGNITION ON mode.
■Seat heater control (vehicles without automatic mode)
The seat heater automatically changes operations. If the engine switch is turned off while
the seat heater is operating, the starting operation of the heater differs depending on the
amount of time that elapses be fore it is turned back on.
1
2
ModeLevel indicator lights
OffOff
Hi3
Mid2
Lo1
Current operation
Starting operation mode and amount of time
elapsed until engine switch in IGNITION ON mode
0 to 15 minutesOver 15 minutes
HiHiHi
MidMidHi
LoLoHi

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GS350_GS F_OM_OM30J07U_(U)5-5. Using the other interior features
Please use as a power supply for electronic goods that use less than 12 V DC /
10 A (power consumption of 120 W).
■The power outlets can be used when
The engine switch is in ACCESSORY or IGNITION ON mode.
■When turning the engine switch off
Disconnect electrical devices
with charging functions, such as mobile battery packs. If
such devices are left connected, the engine switch may not be off normally.
Fold down the armrest for use.
Power outlets
FrontRear
Open the lid.
NOTICE
●To avoid damaging the power outlets, close the power outlet lids when the power out-
lets are not in use.
Foreign objects or liquids that enter the power outlets may cause a short circuit.
●To prevent battery discharge, do not use the power outlets longer than necessary
when the engine is off.
Armrest

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GS350_GS F_OM_OM30J07U_(U)5-5. Using the other interior features
●The rear sunshade can be used when the engine switch is in IGNITION ON mode.
●The rear sunshade can be operated for approximately 1 minute even after the engine
switch is turned to ACCESSORY mode or turned off.
●Reverse operation feature: To ensure adequate
rear visibility, the rear sunshade auto-
matically lowers when the sh ift lever is shifted to R.
However, the rear sunshade is raised again if any of the following occurs:
• The button is pressed again.
*
• Shift the shift lever into P.
• The shift lever is shifted out of R, and the vehicle reaches a speed of 9 mph (15 km/h). If the engine is off when the rear sunshade has been lowered due to the reverse opera-
tion feature, it will not be raised even when the engine is turned on again and the vehi-
cle reaches a speed of 9 mph (15 km/h). To raise the sunshade again, press the button.
*: Occasionally, the reverse function may not be carried out after the switch has been
pressed. Repeat the above operation to operate the function.
●Vehicles with rear control panel: To preven t inadvertent operation, some buttons on the
rear armrest can be locked. ( P. 331)
●Vehicles with rear control panel: Control panel illumination on the rear armrest can be
turned off. ( P. 331)
●Time elapsed before the reverse operation feature activates can be changed.
(Customizable features:  P. 542)
WARNING
When the rear sunshade is being operated, do not place fingers or other objects in the
fastener section or in the opening.
They may get caught, causing injury.
NOTICE
●To prevent battery discharge, do not operate the rear sunshade when the engine is
off.
●Observe the following precautions to ensure normal operation of the rear sunshade
and rear door sunshades.
• Do not place excessive load on the moto r or other components of the rear sun-
shade.
• Do not place objects where they may hinder opening and closing operations.
• Do not attach items to the rear sunshade and rear door sunshades.
• Keep the opening clean and clear of obstructions.
• Do not operate the rear sunshade cont inuously for long periods of time.

GS350_GS F_OM_OM30J07U_(U)
3776-3. Do-it-yourself maintenance
6
Maintenance and care
WARNING
The engine compartment contains many mechan isms and fluids that may move suddenly,
become hot, or become electrically energize d. To avoid death or serious injury, observe
the following precautions.
■When working on the engine compartment
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driving
as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel and
battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.
■When working near the electric cooling fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temperature is high.
(  P. 389)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in
your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner f ilter removed may cause excessive engine wear due to dirt
in the air.

396
GS350_GS F_OM_OM30J07U_(U)6-3. Do-it-yourself maintenance
◆Initializing the tire pressure warning system
■The tire pressure warning system must be
initialized in the following circum-
stances:
●When rotating the tires.
●When the tire inflation pressure is changed such as when changing travel-
ing speed or load weight.
When the tire pressure warning system is initialized, the current tire inflation
pressure is set as the benchmark pressure.
■How to initialize the tire pressure warning system
Park the vehicle in a safe place and turn the engine switch off.
Initialization cannot be performed while the vehicle is moving.
Adjust the tire inflation pressure to th e specified cold tire inflation pressure
level. ( P. 525)
Make sure to adjust the tire pressure to the specified cold tire inflation pressure
level. The tire pressure warning system will operate based on this pressure level.
Turn the engine switch to IGNITION ON mode.
Press or on the meter control switch and select .
Press or on the meter control sw itch and select “Vehicle Settings”.
Then press .
Press or on the meter
control switch and select “TPMS”.
Then press and hold until a
message is displayed.
The message will be displayed on the
multi-information display and the tire
pressure warning light will blink
slowly 3 times.
When the message disappears, ini-
tialization is complete.
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3
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5
6

GS350_GS F_OM_OM30J07U_(U)
3976-3. Do-it-yourself maintenance
6
Maintenance and care
◆Registering ID codes
The tire pressure warning valve and transmitter is equipped with a unique ID
code. When replacing a tire pressure warning valve and transmitter, it is nec-
essary to register the ID code. Have the ID code registered by your Lexus
dealer.
■When to replace your vehicle’s tires
Tires should be replaced if:
●The treadwear indicators are showing on a tire.
●You have tire damage such as cuts, splits, cracks deep enough to expose the fabric, and
bulges indicating internal damage
●A tire goes flat repeatedly or cannot be properly repaired due to the size or location of
a cut or other damage
If you are not sure, consult with your Lexus dealer.
■Replacing tires and wheels
If the ID code of the tire pressure warning valve and transmitter is not registered, the tire
pressure warning system will not work proper ly. After driving for about 20 minutes, the
tire pressure warning light blinks for 1 minu te and stays on to indicate a system malfunc-
tion.
■Tire life
Any tire over 6 years old must be checked by a qualified technician even if it has seldom
or never been used or damage is not obvious.
■Routine tire inflation pressure checks
The tire pressure warning syst em does not replace routine tire inflation pressure checks.
Make sure to check tire inflat ion pressure as part of your routine of daily vehicle checks.
■When rotating the tires
Make sure that the engine switch is off. If the tires are rotated while the engine switch is in
IGNITION ON mode, the tire position information will not be updated.
If this accidentally occurs, either turn the engine switch to off and then to IGNITION ON
mode, or initialize the system after checking th at the tire pressure is properly adjusted.
■Low profile tires (except 225/50R17 tires)
Generally, low profile tires will wear more rapidly and tire grip performance will be
reduced on snowy and/or icy roads when comp ared to standard tires. Be sure to use
snow tires or tire chains on snowy and/or icy roads and drive carefully at a speed appro-
priate for road and weather conditions. ( P. 307)

GS350_GS F_OM_OM30J07U_(U)
3996-3. Do-it-yourself maintenance
6
Maintenance and care
■Situations in which the tire pressure warning system may not operate properly
●In the following cases, the tire pressure warning system may not operate properly.
• If non-genuine Lexus wheels are used.
• A tire has been replaced with a tire that is not an OE (Original Equipment) tire.
• A tire has been replaced with a tire that is not of the specified size.
• Tire chains etc. are equipped.
• An auxiliary-supported run-flat tire is equipped.
• If a window tint that affects th e radio wave signals is installed.
• If there is a lot of snow or ice on the vehi cle, particularly around the wheels or wheel
housings.
• If the tire inflation pressure is extr emely higher than the specified level.
• If wheel without the tire pressure warning valve and transmitter are used.
• If the ID code on the tire pressure warning valves and transmitters is not registered
in the tire pressure warning computer.
●Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio station, large display, air-
port or other facility that generates st rong radio waves or electrical noise
• When carrying a portable radio, cellular phone, cordless phone or other wireless
communication device
If tire position information is not correctly displayed due to the radio wave conditions,
the display may be corrected by driving and changing the radio wave conditions.
●When the vehicle is parked, the time taken for the warning to start or go off could be
extended.
●When tire inflation pressure declines rapidly for example when a tire has burst, the
warning may not function.
■The initialization operation
●Make sure to carry out initialization afte r adjusting the tire inflation pressure.
Also, make sure the tires are cold before carryi ng out initialization or tire inflation pres-
sure adjustment.
●If you have accidentally turned the engine swit ch off during initialization, it is not neces-
sary to manually restart the in itialization again, as initialization will restart automatically
the next time the engine switch is turned to IGNITION ON mode.
●If you accidentally perform initialization when initialization is not necessary, adjust the
tire inflation pressure to the specified leve l when the tires are cold, and conduct initial-
ization again.
■When initialization of the tire pressure warning system has failed
Initialization can be completed in a few minutes. However, in the following cases, the set-
tings have not been recorded and the system will not operate properly. If repeated
attempts to record tire inflation pressure settings are unsuccessful, have the vehicle
inspected by your Lexus dealer.
●The initialization message is not displayed on the multi-information display when per-
forming initialization.
●After carrying out the initializat ion procedure, the tire pressure warning light blinks for 1
minute then stays on after driving for 20 minutes.

4307-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
Tighten down the towing eyelet
securely using a wheel nut wrench
or hard metal bar.
Securely attach cables or chains to the towing eyelet.
Take care not to damage the vehicle body.
Enter the vehicle being towed and start the engine.
If the engine does not start, turn the engine switch to IGNITION ON mode.
Shift the shift lever to N and release the parking brake.
When the shift lever cannot be shifted: P. 214
■While towing
If the engine is not running, the power assist for the brakes and steering will not function,
making steering and br aking more difficult.
■Wheel nut wrench
Wheel nut wrench is installed in trunk. ( P. 474, 486)
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4387-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
*1: Open door warning buzzer: P. 442
*2: Driver’s seat belt buzzer:
The driver’s seat belt buzzer sounds to alert the driver that his or her seat belt is not
fastened. Once the engine switch is turned to IGNITION ON mode, the buzzer
sounds for 6 seconds. If the vehicle reaches a speed of 12 mph (20 km/h), the buzzer
sounds once. If the seat belt is still unfast ened after 24 seconds, the buzzer will sound
intermittently for 10 seconds. Then, if the se at belt is still unfastened, the buzzer will
sound in a different tone for 20 more seconds.
Front passenger’s seat belt buzzer:
The front passenger’s seat belt buzzer soun ds to alert the front passenger that his or
her seat belt is not fastened. The buzzer so unds once if the vehicle reaches a speed of
12 mph (20 km/h). If the seat belt is still unfastened after 24 se conds, the buzzer will
sound intermittently for 10 se conds. Then, if the seat belt is still unfastened, the buzzer
will sound in a different to ne for 20 more seconds.
(If equipped)
LKA warning light
The warning light comes on and a warning message is displayed to
indicate that the LKA (Lane-Keepin g Assist) system is not available
temporarily or has detected a malfunction.
 P. 452, 453
Warning lightWarning light/Details/Actions

4397-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
7
When trouble arises
■SRS warning light
This warning light system monitors the airbag sensor assembly, front impact sensors, side
impact sensors (front door), side impact se nsors (front), side impact sensors (rear),
driver’s seat position sensor, driver’s seat belt buckle switch, front passenger occupant
classification system, “AIR BAG ON” indicat or light, “AIR BAG OFF” indicator light,
front passenger’s seat belt buckle switch, seat belt pretensioner assemblies, airbags,
interconnecting wiring and power sources. (P. 43)
■Front passenger detection sensor, seat belt reminder and warning buzzer
If luggage is placed on the front passenger seat, the front passenger detection sensor
may cause the warning light to flash and the warning buzzer to sound even if a passenger
is not sitting in the seat.
■If the malfunction indicator lamp comes on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fu el tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after several driving trips.
If the light does not go off even after severa l trips, contact your Lexus dealer as soon as
possible.
■Electric power steering system warning light (warning buzzer)
When the battery charge becomes insufficien t or the voltage temporarily drops, the
electric power steering system warning li ght may come on and the warning buzzer may
sound.
■When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level. Initializing the tire
pressure warning system will not turn off the tire pressure warning light.
■The tire pressure warning light may come on due to natural causes
The tire pressure warning light may come on due to natural causes such as natural air
leaks and tire inflation pressure changes caus ed by temperature. In this case, adjusting
the tire inflation pressure will turn off the warning light (after a few minutes).
■When a tire is replaced with a spare tire
The compact spare tire is not equipped with a tire pressure warning valve and transmit-
ter. If a tire goes flat, the tire pressure warning light will not turn off even though the flat
tire has been replaced with the spare tire.
■Conditions that the tire pressure wa rning system may not function properly
 P. 399
■If the tire pressure warning light freque ntly comes on after blinking for 1 minute
If the tire pressure warning light frequently comes on after blinking for 1 minute when the
engine switch is turned to IGNITION ON mo de, have it checked by your Lexus dealer.