steering Lexus GS300h 2013 Repair Manual

3764-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
Leaving the vehicle stopped, turn the steering wheel all the
way to the left.
Be sure to turn the steering wheel only when the vehicle is stopped.
When the screen changes, keep the steering wheel in its cur-
rent position and back up.
When backing up, be careful not to hit any obstacles with the right front
corner of your vehicle. Back the vehicle up slowly.
When the vehicle is parallel with the road or the shoulder,
straighten the steering wheel.
Check your surroundings visually and with the mirrors, then
back up using the distance guide lines as a reference, and stop.
When the vehicle is approximately in the desired parking location, the
parallel parking assist is complete.

Parallel parking assist mode information
• There is a possibility that parallel parking guidance may not
be given when backing up at a very slow speed.
• If the trunk is opened during parallel parking guidance, the
parallel parking assist will be interrupted and canceled. Stop
the vehicle, shift the shift lever out of the R position, and
restart the operation from the step
.
Canceling parallel parking assist
Select .
Vehicles with Lexus parking assist-sensor
If Lexus parking assist-sensor detects an object while you
attempt to park in a parking space on the left, the black and
yellow vertical pole could be obscured by Lexus parking
assist-sensor display. In this event, turn Lexus parking assist-
sensor switch off (P. 349), and operate the vehicle while
checking the safety of the surrounding area direct visually and
with mirror. After the operation, turn the switch on.
8
9
10
1

3774-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
If the message “Steering wheel turned too far, please return.”
is displayed
The steering wheel has been turned too far, and the system
cannot function. Return the steering wheel to its original posi-
tion.
If the message is displayed before the outline is positioned
over the desired parking space, it is likely that the vehicle is
too far away from the shoulder. Check that there is a gap of
approximately 1 m (3 ft.) between your vehicle and the parked
vehicle.
Narrow mode
If the position the vehicle is to be parked in is narrower than
usual, narrow mode can be used.
Normal mode
Narrow mode
The power switch is turned off
when the parking assist monitor
is canceled with narrow mode,
the caution screen is displayed
first when the parallel parking
assist is selected next time.
1
2

3864-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
The image is blurry
Dirt or foreign matter
(such as water droplets,
snow, mud etc.) is
adhering to the camera.Rinse the camera lens
with water and wipe it
clean with a soft cloth.
Wash with a mild soap
if the dirt is stubborn.
The image is out of
alignment
The camera or sur-
rounding area has
received a strong
impact.
Have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
The guide lines are
very far out of align-
ment
The camera position is
out of alignment.
Have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
• The vehicle is tilted
(there is a heavy load
on the vehicle, tire
pressure is low due to
a tire puncture, etc.)
• The vehicle is used
on an incline.If this happens due to
these causes, it does
not indicate a malfunc-
tion.
Back up while visually
checking the vehicle’s
surroundings.
The estimated course
lines move even
though the steering
wheel is straightThere is a malfunction
in the signals being
output by the steering
sensor.
Have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
SymptomLikely causeSolution

3874-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
Guide lines are not dis-
playedThe trunk lid is open.
Close the trunk lid.
If this does not resolve
the symptom, have the
vehicle inspected by
any authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
“System is initializ-
ing.” is displayed
• The 12-volt battery
has been reinstalled.
• The steering wheel
has been moved
while the 12-volt bat-
tery was being rein-
stalled.
• 12-volt battery power
is low.
• The steering sensor
has been reinstalled.
• There is a malfunc-
tion in the signals
being output by the
steering sensor.
Stop the vehicle, and
turn the steering wheel
as far as it will go to
the left and right.
If this does not resolve
the symptom, have the
vehicle inspected by
any authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
• On the system initial-
ization screen, select
the “?” button to dis-
play the operating
procedure.
SymptomLikely causeSolution

3884-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
CAUTION
When using the Lexus parking assist monitor system
The Lexus parking assist monitor is a supplemental device intended to
assist the driver when backing up. When backing up, be sure to check visu-
ally behind and all around the vehicle before proceeding.
Observe the following precautions to avoid an accident that could result in
death or serious injuries.
Never depend on the Lexus parking assist monitor entirely when backing
up. The image and the position of the guide lines displayed on the screen
may differ from the actual state.
Use caution, just as you would when backing up any vehicle.
Be sure to back up slowly, depressing the brake pedal to control vehicle
speed.
If you seem likely to hit nearby vehicles, obstacles, people or mount the
shoulder, depress the brake pedal to stop the vehicle, then disable the
assist system by select on the screen to cancel the system.
The instructions given are only guidelines.
When and how much to turn the steering wheel will vary according to
traffic conditions, road surface conditions, vehicle condition, etc. when
parking. It is necessary to be fully aware of this before using the parking
assist system.
When parking, be sure to check that the parking space will accommodate
your vehicle before maneuvering into it.
Do not use the Lexus parking assist monitor in the following cases:
• On icy or slick road surfaces, or in snow
• When using tire chains or emergency tires
• When the trunk lid is not closed completely
• On roads that are not flat or straight, such as curves or slopes.

3894-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
CAUTION
In low temperatures, the screen may darken or the image may become
faint. The image could distort when the vehicle is moving, or you may
become unable to see the image on the screen. Be sure to check direct
visually and with mirror all around the vehicle before proceeding.
If the tire sizes are changed, the position of the guide lines displayed on
the screen may change.
The camera uses a special lens. The distances between objects and pedes-
trians that appear in the image displayed on the screen will differ from the
actual distances. (P. 381)
When using the perpendicular parking assist screen
Estimated course line display mode: If the steering wheel is straight and the
vehicle width extension guide lines and the estimated course lines are not in
alignment, have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
When using the parallel parking assist screen
Do not use the system if the display is incorrect due to an uneven (curvy/
hilly) road or a non-straight road.
Make sure to operate the steering wheel only when the vehicle is stopped.
Be sure to check that there are no obstacles inside the blue outline.
If there are any obstacles inside the blue outline, do not use the parallel
parking assist.
When positioning the blue outline over the parking space, be sure to posi-
tion it so that the extended blue line may not cross the tire of the vehicle
parked in front of the empty space.

393
4 4-5. Using the driving support system
Driving
GS450h_300h_OM_OM30D53E_(EE)
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 MODE” indicator comes on in the multi-information
display.
Also, on vehicles equipped with a
12.3-inch display, the driving
mode is also automatically dis-
played on the “Side Display”.
(P. 444)
Sport mode
Assists acceleration response by controlling the hybrid system
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 dis-
play, and the Hybrid System Indicator changes to the tachometer. (P.
109)
Also, on vehicles equipped with a
12.3-inch display, the driving
mode is also automatically dis-
played on the “Side Display”.
(P. 444)
2
3

3954-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
Sport mode
• SPORT S mode
Assists acceleration response by controlling the hybrid system.
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, and the Hybrid System Indicator changes to the
tachometer. (P. 109)
Also, on vehicles equipped with
a 12.3-inch display, the driving
mode is also automatically dis-
played on the “Side Display”.
(P. 444)
• SPORT S+ mode
Helps to ensure steering performance and driving stability by
simultaneously controlling the steering and suspension in
addition to the hybrid system. 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, and the Hybrid System Indicator changes to the tachometer.
(P. 109)
Also, on vehicles equipped with
a 12.3-inch display, the driving
mode is also automatically dis-
played on the “Side Display”.
(P. 444)
3

3974-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
Driving assist systems
ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied sud-
denly, 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
TRC (Traction Control)
Helps to maintain drive power and prevent the drive wheels from
spinning when starting the vehicle or accelerating on slippery
roads
VGRS (Variable Gear Ratio Steering) (if equipped)
Adjusts the front wheel turning angle in accordance with the
vehicle speed and steering wheel movement
To help enhance driving safety and performance, the following
systems operate automatically in response to various driving situa-
tions. Be aware, however, that these systems are supplementary
and should not be relied upon too heavily when operating the vehi-
cle.

3984-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)
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 vehi-
cle 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 driv-
ing 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.
394)
LDH (Lexus Dynamic Handling system) (if equipped)
Provides independent control of the VGRS, DRS and EPS. Con-
tributes 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
steering wheel operation and vehicle speed
VDIM (Vehicle Dynamics Integrated Management)
Provides integrated control of the ABS, brake assist, TRC, VSC,
EPS, VGRS (if equipped) and DRS (if equipped) systems
Helps to maintain vehicle stability when swerving on slippery
road surfaces by controlling the brakes, hybrid system output,
steering assist, and steering ratio and rear wheel angle