2019 Lexus GS300 steering

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GS350_300_OM_OM30G96U_(U)4-5. Using the driving support systems
●Vehicle sway warning function
This function operates when all of
the following conditions are met.
• Setting for “Sway Warning” in of the multi-information display is set to “On”.
(  P. 106, 114)
• Vehicle speed is approximatel y 32 mph (50 km/h) or more.
• Width of traffic lane is approx imately 9.8 ft. (3 m) or more.
• No system malfunctions are detected. ( P. 264)
●Lane centering function
This function operates when all of the following conditions are met.
• LKA is turned on.
• Setting for “Steering Assist” and “Lane Center” in of the multi-information display are set to “On”. ( P. 106, 114)
• System recognizes white (yellow) lines.
• Dynamic radar cruise control with full-speed range is operating.
• Width of traffic lane is approximately 8.2 to 13.5 ft. (2.5 to 4.1 m).
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or around a gentle curve with a radius of more
than approximately 656 ft. (200 m).
• No system malfunctions are detected. ( P. 264)
• Vehicle does not accelera te or decelerate by a certain amount or more.
• Steering wheel is not operated with a steering force level suitable for changing
lanes.
• ABS, VSC, TRAC and PCS (Pre-Collision System) are not operating.
• TRAC or VSC is not turned off.
• GS F: Hands off steering wheel alert is not displayed. ( P. 263)
• Steering assist function is not operating.
■Temporary cancellation of functions
When the operation conditions are no longer met, a function may be temporarily can-
celed. However, when the operation conditio ns are met again, operation of the function
is automatically restored. ( P. 261)
■Steering assist function/lane centering function
Depending on the vehicle speed, lane depart ure situation, road conditions, etc., the
driver may not feel the function is operating or the function may not operate at all.
■Lane departure alert function
The warning buzzer may be difficult to hear due to external noise, audio playback, etc.
Also, it may be difficult to f eel steering wheel vibrations due to the road conditions, etc.

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4
Driving
■Hands off steering wheel warning
GS350/GS300:
Depending on the vehicle and road conditions, the warning may not operate.
GS F:
Depending on the vehicle and road conditions, the warning may not operate.
■Vehicle sway warning function
Depending on the vehicle and road conditions, the warning may not operate. When the system determines that the driver has
removed their hands from the steering wheel
while the steering assist function or lane center-
ing function is operating, a warning message
urging the driver to hold the steering wheel and
the symbol shown in the illustration are dis-
played on the multi-information display.
If the driver continues to keep their hands off of
the steering wheel, a buzzer sounds and a warn-
ing message and the symbol shown in the illus-
tration are displayed on the multi-information
display. This warning al so operates in the same
way when the driver cont inuously operates the
steering wheel only a small amount. Always
keep your hands on the steering wheel when
using this system, regardless of warnings.
When the system determines that the driver has
removed their hands from the steering wheel
while the steering assist function or lane center-
ing function is operating, a warning message
urging the driver to hold the steering wheel and
the symbol shown in the illustration are dis-
played on the multi- information display.
If the driver continues to keep their hands off of
the steering wheel, a warning message and the
symbol shown in the illustration are displayed on
the multi-information display, and the function is
temporarily canceled. This warning also oper-
ates in the same way when the driver continu-
ously operates the steering wheel only a small
amount. Always keep your hands on the steer-
ing wheel when using th is system, regardless of
warnings.
When the system determines that the vehicle is
swaying while the vehicle sway warning function
is operating, a buzzer sounds and a warning
message urging the driver to rest and the sym-
bol shown in the illustration are simultaneously
displayed on the multi- information display.

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Driving
■Customization
The following settings can be changed.
For how to change settings, refer to P. 549.
FunctionSetting details
Lane departure alert functionAdjust alert sensitivity
Adjust alert type
Steering assist functionTurn steering wheel assistance on and off
Vehicle sway warning functionTurn function on and off
Adjust alert sensitivity
Lane centering functionTurn function on and off

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Driving
■Conditions under which the vehicle-to-vehicle distance control mode may not function
correctly
In the case of the following conditions, o perate the brake pedal (or accelerator pedal,
depending on the situ ation) as necessary.
As the sensor may not be able to correctly detect vehicles ahead, the system may not
operate properly.
●When the vehicle ahead of you decelerates suddenly
●When driving on a road surrounded by a struct ure, such as in a tunnel or on a bridge
●While the vehicle speed is decreasing to the set speed after the vehicle accelerates by
depressing the accelerator pedal
●When your vehicle is pointing upwards
(caused by a heavy load in the luggage com-
partment, etc.)
●Preceding vehicle has an extremely high
ground clearance
●When the road curves or when the lanes are
narrow
●When steering wheel operation or your posi-
tion in the lane is unstable

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GS350_300_OM_OM30G96U_(U)4-5. Using the driving support systems
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Driving
Driving mode select switch
GS350/GS300 (vehicles without Adaptive Variable Suspension system)
Normal mode
For normal driving.
Press the switch to change the driving mode
to normal mode when selected to Eco
drive mode or sport mode.
Eco drive mode
Use Eco drive mode to help achieve low fuel consumption during trips that
involve frequent accelerating.
When not in Eco drive mode and the driving mode select switch is turned to the left,
the “ECO” indicator comes on in the multi-information display.
Sport mode
Assists acceleration response by cont rolling the transmission, engine and
steering. Suitable for when precise ha ndling is desirable, for example when
driving on mountain roads.
When not in sport mode and the driving mode select switch is turned to the right, the
“SPORT” indicator comes on in the multi-information display.
The driving modes can be selected to suit driving condition.
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2
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Driving
Sport mode•SPORT S mode
Assists acceleration response by co ntrolling the transmission and engine.
When not in SPORT S mode and the driving mode select switch is turned to the
right, the “SPORT S” indicator comes on in the multi-information display.
•SPORT S+ mode
Helps to ensure steering performanc e and driving stability by simultane-
ously controlling the steeri ng and suspension in addition to the transmis-
sion and engine. Suitable for sporty driving.
When in SPORT S mode and the driving mode select switch is turned to the right,
the “SPORT S+” indicator comes on in the multi-information display.
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Driving
Sport mode•SPORT S mode
Assists acceleration response by co ntrolling the transmission and engine.
When not in SPORT S mode, if the driving mode select switch is turned to the
right, the “SPORT S” indicator comes on in the meter.
•SPORT S+ mode
Provides earlier downshift timing than SPORT S mode in order to maintain
a high engine speed and provides faster gear changes. This mode also
changes the steering feel, suspension control and VDIM control, making it
suitable for powerful sporty driving.
When in SPORT S mode, if the driving mode select switch is turned to the right,
the “SPORT S+” indicator comes on in the meter.
■Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heating/cooling operations and fan speed of the air condi-
tioning system to enhance fuel efficiency. To improve air conditioning performance, per-
form the following operations:
●Turn off eco air conditioning mode ( P. 318)
●Adjust the fan speed ( P. 317)
●Turn off Eco drive mode
■Automatic operation of the seat heater during Eco drive mode
Eco drive mode controls the heating operatio n and fan speed of the air conditioning sys-
tem to enhance fuel efficiency. If the driving mode select switch is switched to Eco drive
mode in cold temperatures, the seat heater will be automatically operated to assist heat-
ing performance.
■Automatic deactivation of sport mode and customized mode
If the engine switch is turned off after dr iving in sport mode or customized mode, the
drive mode will be changed to normal mode.
■Driving mode pop-up display (12.3-inch display only)
When the driving mode is changed, the sele cted driving mode will be temporarily dis-
played on the side display. ( P. 314)
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GS350_300_OM_OM30G96U_(U)4-5. Using the driving support systems
TVD (Torque Vectoring Differential) (GS F)
With the engine switch in IGNITION
ON mode, pressing the TVD switch
changes the TVD control mode.
The current TVD control mode will be
displayed on the meters.
STANDARD mode
This is the default mode and provides
an optimum balance of driving agility
and stability.
SLALOM mode
This mode emphasizes enhanced
steering response.
TRACK mode
This mode emphasiz
es stability for
high speed sporty driving.
The multi-information display shows the di stribution of driving force between the
right and left rear wheels. ( P. 119)
The TVD system distributes driving force (torque) between the right an\
d left
rear wheels automatically. This syst em contributes to enhanced steering
response while cornering and increased traction when exiting a corner, pro-
viding an agile driving experience.
Changing TVD control modes
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TVD control status on the multi-information display