Lexus GS300h 2013 Owner's Manual

3004-5. Using the driving support system
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Cruise control can be set when
The shift lever is in D or range 4 or higher of S has been selected.
Range 4 or higher of D has been selected by using the paddle shift.
Vehicle speed is above approximately 40 km/h (25 mph).
Accelerating after setting the vehicle speed
The vehicle can be accelerated normally. After acceleration, the set speed
resumes.
Even without canceling the cruise control, the set speed can be increased by
first accelerating the vehicle to the desired speed and then pushing the lever
down to set the new speed.
Automatic cruise control cancelation
Cruise control will stop maintaining the vehicle speed in any of the following
situations.
Actual vehicle speed falls more than approximately 16 km/h (10 mph)
below the preset vehicle speed.
At this time, the memorized set speed is not retained.
Actual vehicle speed is below approximately 40 km/h (25 mph).
VSC is activated.
TRC is activated for a period of time.
When the VSC or TRC system is turned off by pressing the VSC OFF
switch.
If the warning message for the cruise control is shown on the multi-informa-
tion display
Press the “ON/OFF” button once to deactivate the system, and then press the
button again to reactivate the system.
If the cruise control speed cannot be set or if the cruise control cancels imme-
diately after being activated, there may be a malfunction in the cruise control
system. Have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.

3014-5. Using the driving support system
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CAUTION
To avoid operating the cruise control by mistake
Switch the cruise control off using the “ON/OFF” button when not in use.
Situations unsuitable for cruise control
Do not use cruise control in any of the following situations.
Doing so may result in loss of control and could cause an accident resulting
in death or serious injury.
In heavy traffic
On roads with sharp bends
On winding roads
On slippery roads, such as those covered with rain, ice or snow
On steep hills
Vehicle speed may exceed the set speed when driving down a steep hill.
When your vehicle is towing a trailer or during emergency towing

3024-5. Using the driving support system
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Dynamic radar cruise control
Dynamic radar cruise control supplements conventional cruise con-
trol with a vehicle-to-vehicle distance control. In vehicle-to-vehicle
distance control mode, the vehicle automatically accelerates or
decelerates in order to maintain a set following distance from vehi-
cles ahead.
Vehicle-to-vehicle distance
button
Display
Set speed
Indicators
Cruise control switch

: If equipped
Summary of functions
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3034-5. Using the driving support system
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Press the “ON/OFF” button to
activate the cruise control.
Radar cruise control indicator will
come on.
Press the button again to deactivate
the cruise control.
Accelerate or decelerate the
vehicle to the desired speed,
and push the lever down to set
the speed.
“SET” indicator will be displayed.
The vehicle speed at the moment
the lever is released becomes the
set speed.
Setting the vehicle speed (vehicle-to-vehicle distance control
mode)
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3044-5. Using the driving support system
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To change the set speed, operate the lever until the desired set speed
is displayed.
Increases the speed
Decreases the speed
Fine adjustment: Momentarily
move the lever in the desired direc-
tion.
Large adjustment: Hold the lever
in the desired direction.
In the vehicle-to-vehicle distance control mode, the set speed will be
increased or decreased as follows:
• When the set speed is shown in “MPH”
Fine adjustment: By approximately 8 km/h (5 mph) each time the lever
is operated
Large adjustment: By approximately 8 km/h (5 mph) for each 0.3 sec-
onds the lever is held
• When the set speed is shown in “km/h”
Fine adjustment: By approximately 5 km/h (3.1 mph) each time the
lever is operated
Large adjustment: By approximately 5 km/h (3.1 mph) for each 0.3 sec-
onds the lever is held
In the constant speed control mode (P. 309), the set speed will be
increased or decreased as follows:
Fine adjustment: By approximately 1.6 km/h (1 mph) each time the lever
is operated
Large adjustment: The set speed can be increased or decreased continually
until the lever is released.
Adjusting the set speed
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3054-5. Using the driving support system
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Driving
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Pressing the button changes the
vehicle-to-vehicle distance as
follows:
Long
Medium
Short
The vehicle-to-vehicle distance is
set automatically to long mode
when the power switch is turned to
ON mode.
If a vehicle is running ahead of
you, the preceding vehicle mark
will also be displayed.
Select a distance from the table below. Note that the distances
shown correspond to a vehicle speed of 80 km/h (50 mph). Vehicle-
to-vehicle distance increases/decreases in accordance with vehicle
speed.
Changing the vehicle-to-vehicle distance
Preceding
vehicle
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Vehicle-to-vehicle distance settings
Distance optionsVehicle-to-vehicle distance
LongApproximately 50 m (160 ft.)
MediumApproximately 40 m (130 ft.)
ShortApproximately 30 m (100 ft.)

3064-5. Using the driving support system
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Pulling the lever toward you
cancels the cruise control.
The speed setting is also canceled
when the brakes are applied.
Pushing the lever up resumes
the cruise control and returns
vehicle speed to the set speed.
Resuming is available when the
vehicle speed is more than approx-
imately 40 km/h (25 mph).
Canceling and resuming the speed control
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3074-5. Using the driving support system
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This mode employs a radar sensor to detect the presence of vehicles
up to approximately 120 m (400 ft.) ahead, determines the current
vehicle-to-vehicle following distance, and operates to maintain a
suitable following distance from the vehicle ahead.
Note that vehicle-to-vehicle distance will close in when traveling on long
downhill slopes.
Example of constant speed cruising
When there are no vehicles ahead
The vehicle travels at the speed set by the driver. The desired vehicle-to-
vehicle distance can also be set by operating the vehicle-to-vehicle dis-
tance control.
Example of deceleration cruising
When the vehicle ahead is driving slower than the set speed
When a vehicle is detected running ahead of you, the system automatically
decelerates your vehicle. When a greater reduction in vehicle speed is nec-
essary, the system applies the brakes. A warning tone warns you when the
system cannot decelerate sufficiently to prevent your vehicle from closing
in on the vehicle ahead.
Driving in vehicle-to-vehicle distance control mode
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3084-5. Using the driving support system
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Example of follow-up cruising
When following a vehicle driving slower than the set speed
The system continues follow-up cruising while adjusting for changes in
the speed of the vehicle ahead in order to maintain the vehicle-to-vehicle
distance set by the driver.
Example of acceleration
When there are no longer any vehicles ahead driving slower than
the set speed
The system accelerates until the set speed is reached. The system then
returns to constant speed cruising.
When your vehicle is too close to a vehicle ahead, and sufficient
automatic deceleration via the cruise control is not possible, the dis-
play will flash and the buzzer will sound to alert the driver. An
example of this would be if another driver cuts in front of you while
you are following a vehicle. Apply the brakes to ensure an appro-
priate vehicle-to-vehicle distance.
Warnings may not occur when
In the following instances, there is a possibility that the warnings
will not occur:
When the speed of the vehicle ahead matches or exceeds your
vehicle speed
When the vehicle ahead is traveling at an extremely slow
speed
Immediately after the cruise control speed was set
At the instant the accelerator is applied
Approach warning
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3094-5. Using the driving support system
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Driving
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When constant speed control mode is selected, your vehicle will
maintain a set speed without controlling the vehicle-to-vehicle dis-
tance. Select this mode only when vehicle-to-vehicle distance con-
trol mode does not function correctly due to dirt etc.
Press the “ON/OFF” button to
activate the cruise control.
Press the button again to deactivate
the cruise control.
Switch to constant speed con-
trol mode.
(Push the lever forward and
hold for approximately 1 sec-
ond.)
Cruise control indicator will come
on.
When in constant speed control
mode, to return to vehicle-to-vehi-
cle distance control mode, push the
lever forward again and hold for
approximately 1 second.
After the desired speed has been
set, it is not possible to return to
vehicle-to-vehicle distance control
mode.
If the power switch is turned off
and then turned to ON mode again,
the vehicle will automatically
return to vehicle-to-vehicle dis-
tance control mode.
Adjusting the speed setting:P.
299
Selecting conventional constant speed control mode
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