steering Lexus GS F 2016 Repair Manual

GS350_200t_GS F_OM_OM30E86U_(U)
2654-5. Using the driving support systems
4
Driving
■Wa r n i n g m e s s a g e
Warning messages are used to indicate a system malfunction or to inform the driver of
the need for caution while driving. ( →P. 4 5 9 )
■Customization
The following settings can be changed.
*: If equipped
For how to change settings, refer to P. 568.
FunctionSetting details
Lane departure alert functionAdjust alert sensitivity
Adjust alert type*
Steering control function*Turn steering wheel assistance on and off
Vehicle sway warningTurn function on and off
Adjust alert sensitivity

GS350_200t_GS F_OM_OM30E86U_(U)
2774-5. Using the driving support systems
4
Driving
■Conditions under which the vehicle-to-vehicle distance control mode may not function
correctly
In the case of the following conditions, operate the brake pedal (or accelerator pedal,
depending on the situation) 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 the road curves or when the lanes are
narrow
●When steering wheel operation or your posi-
tion in the lane is unstable

GS350_200t_GS F_OM_OM30E86U_(U)
2894-5. Using the driving support systems
4
Driving
■Conditions under which the vehicle-to-vehicle distance control mode may not function
correctly
In the case of the following conditions, operate the brake pedal (or accelerator pedal,
depending on the situation) 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 the road curves or when the lanes are
narrow
●When steering wheel operation or your posi-
tion in the lane is unstable

293
GS350_200t_GS F_OM_OM30E86U_(U)4-5. Using the driving support systems
4
Driving
Driving mode select switch
XGS350/GS200t (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 an
d 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 controlling the transmission, engine and
steering. Suitable for when precise handling 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.
1
2
3

GS350_200t_GS F_OM_OM30E86U_(U)
2954-5. Using the driving support systems
4
Driving
Sport mode•SPORT S mode
Assists acceleration response by controlling 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 performance and driving stability by simulta-
neously controlling the steering 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.
3

296
GS350_200t_GS F_OM_OM30E86U_(U)4-5. Using the driving support systems
XGS F
Normal mode
For normal driving.
Press the switch to change the driving mode to normal mode when Eco drive mode or
sport mode is selected. The normal mode indicator comes on in the meter.
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, if the driving mode
select switch is turned to the left, the
Eco drive mode indicator comes on in the meter.
Sport mode
•SPORT S mode
Assists acceleration response by controlling 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+ modeProvides 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 and VDIM control, making it suitable for power-
ful 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.
1
2
3

306
GS350_200t_GS F_OM_OM30E86U_(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 emphasizes stability for
high speed sporty driving.
The multi-information display shows the distribution of driving force between the
right and left rear wheels. (
→P. 113)
The TVD system distributes driving fo rce (torque) between the right and left
rear wheels automatically. This system contributes to enhanced steering
response while cornering and increased traction when exiting a corner, pro-
viding an agile driving experience.
Changing TVD control modes
1
2
3
TVD control status on the multi-information display

308
GS350_200t_GS F_OM_OM30E86U_(U)4-5. Using the driving support systems
Driving assist systems
◆ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenly, or if the
brakes are applied while driving on a slippery road surface
◆Brake assist
Generates an increased level of braking force after the brake pedal is
depressed when the system detects a panic stop situation
◆VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or turning on
slippery road surfaces
◆Enhanced VSC (Enhanced Vehicle Stability Control)
Provides cooperative control of the ABS, TRAC, VSC and EPS.
Helps to maintain directional stability when swerving on slippery road sur-
faces by controlling steering performance.
◆TRAC (Traction Control)
Helps to maintain drive power and prevent the drive wheels from spinning
when starting the vehicle or accelerating on slippery roads
◆Hill-start assist control
Helps to prevent the vehicle from ro
lling backward when starting on an
incline.
To help enhance driving safety and performance, the following systems oper-
ate automatically in response to various driving situations. Be aware, however,
that these systems are supplementary and should not be relied upon too
heavily when operating the vehicle.

GS350_200t_GS F_OM_OM30E86U_(U)
3094-5. Using the driving support systems
4
Driving
◆VGRS (Variable Gear Ratio Steering) (if equipped)
Adjusts the front wheel turning angle in accordance with the vehicle speed
and steering wheel movement
◆DRS (Dynamic Rear Steering) (if equipped)
Contributes to the turning characteristics and responsiveness of the vehicle
by slightly adjusting the rear wheel angle of the vehicle in accordance with
steering wheel movement
◆EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to turn the
steering wheel
◆AVS (Adaptive Variable Suspension system) (if equipped)
By independently controlling the damping force of the shock absorbers for
each of the 4 wheels according to the road and driving conditions, this system
helps riding comfort with superior steering stability, and helps good vehicle
posture
When SPORT S+ mode is selected by the driving mode select switch, the
damping force is suitable for sporty driving (→P. 2 9 3 )
◆LDH (Lexus Dynamic Handling system) (if equipped)
Provides independent control of the VGRS, DRS and EPS. Contributes to
turning characteristics at low speeds, responsiveness at medium speeds and
safety at high speeds by controlling the steering angle of the front and rear
wheels in accordance with the steeri ng wheel operation and vehicle speed
◆VDIM (Vehicle Dynamics Integrated Management)
Provides integrated control of the ABS, brake assist, TRAC, VSC, hill-start
assist control, EPS, VGRS (if equipped) and DRS (if equipped) systems
Helps to maintain vehicle stability when swerving on slippery road surfaces by
controlling the brakes, engine output, steering assist, and steering ratio and
rear wheel angle

GS350_200t_GS F_OM_OM30E86U_(U)
3114-5. Using the driving support systems
4
Driving
To turn the TRAC system off, quickly press and release .
GS350/GS200t: The “Traction Control Turned Off” will be shown on the multi-infor-
mation display.
GS F: The “TRAC OFF” indicator light will come on.
Press again to turn the system back on.
■Turning off both TRAC/VSC systems
XGS350/GS200t
To turn the TRAC/VSC systems off, press and hold for more than 3 seconds while
the vehicle is stopped. The VSC OFF indicator light will come on and the “Traction Control Turned Off” will
be shown on the multi-information display.
*1
Press again to turn the systems back on.
XGS F
To turn the TRAC and VSC systems off, press and hold for more than 3 seconds. The “TRAC OFF” indicator light and the VSC OFF indicator light will come on.
*2
Press again to turn the systems back on.
*1: On vehicles with PCS (Pre-Collision System), pre-collision brake assist, pre-collision
braking, and steering control (performed through cooperative control of PCS [Pre-
Collision System] and LDH) (if equipped) will also be disabled. The pre-collision sys-
tem warning light will come on and a message will be displayed on the multi-informa-
tion display. ( →P. 4 5 9 )
*2: On vehicles with PCS (Pre-Collision System), pre-collision brake assist and pre-colli-
sion braking will also be disabled. The PC S (Pre-Collision System) warning light will
come on and a message will be displayed on the multi-information display. ( →P. 4 5 9 )