2013 Lexus GS300h Owner's Manual

3264-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)lever up or depressing the accelerator pedal will resume follow-up cruis-
ing.
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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3274-5. 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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3284-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)Canceling and resuming the speed
setting: P. 2 9 9

3294-5. Using the driving support system
4
Driving
GS450h_300h_OM_OM30D53E_(EE)
Dynamic radar cruise control with full-speed range 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 50 km/h (30 mph).
Accelerating after setting the vehicle speed
The vehicle can accelerate normally. After acceleration, the set speed
resumes. However, during vehicle-to-vehicle distance control mode, the
vehicle speed may decrease below the set speed in order to maintain the dis-
tance to the vehicle ahead.
Automatic cancelation of vehicle-to-vehicle distance control
Vehicle-to-vehicle distance control driving is automatically canceled in the
following situations:
Actual vehicle speed falls below approximately 40 km/h (25 mph) when
there are no vehicle ahead.
The preceding vehicle leaves the lane when your vehicle is following at a
speed below 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.
The sensor cannot operate correctly because it is covered in some way.
The windshield wipers are operating at high speed (when the wiper switch
is set to AUTO mode or the high speed wiper operation).
When snow mode is set.
The parking brake is operated.
The vehicle is stopped by system control on a steep incline.
Pre-crash brake assist is activated.
The following are detected when the vehicle has been stopped by system
control:
• The driver is not wearing a seat belt.
• The driver’s door is opened.
• The trunk or hood is opened.
• The vehicle has been stopped for about 3 minutes.
If vehicle-to-vehicle distance control driving is automatically canceled for
any other reason, there may be a malfunction in the system. Contact any

3304-5. Using the driving support system
GS450h_300h_OM_OM30D53E_(EE)authorized Lexus dealer or repairer, or another duly qualified and equipped
professional.

3314-5. Using the driving support system
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Driving
GS450h_300h_OM_OM30D53E_(EE)
Automatic cancelation of constant speed control
The cruise control will stop maintaining the vehicle speed in the following
situations:
Actual vehicle speed is more than approximately 16 km/h (10 mph) below
the set vehicle speed.
At this time, the memorized set speed is not retained.
Actual vehicle speed falls 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.
When the LKA (Lane-Keeping Assist) will be activated
Using the radar cruise control in vehicle-to-vehicle distance control mode,
lane keeping assistance control is activated.
Radar sensor and grille cover
Always keep the sensor and grille cover clean to ensure that the vehicle-to-
vehicle distance control operates properly. (Some obstructions, such as snow,
ice or plastic objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control with full-speed range is canceled if an obstruc-
tion is detected.
Warning messages and buzzers for dynamic radar cruise control with full-
speed range
Warning messages and buzzers are used to indicate a system malfunction or
to inform the driver of the need for caution while driving. (P. 841) Grille cover
Radar sensor
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3324-5. Using the driving support system
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Certification

3334-5. Using the driving support system
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Driving
GS450h_300h_OM_OM30D53E_(EE)The latest “DECLARATION of CONFORMITY” (DoC) is available at the
following:
http://www.globaldenso.com/en/products/oem/index.html#2