Page 239 of 612

2394-3. Operating the lights and wipers
4
Driving
IS300h_EE(OM53C61E)
■The windshield wiper and washer can be operated when
The power switch is in ON mode.
■Dripping prevention wiper sweep
After performing a washing and wiping operation several times, the wipers operate one
more time after a short delay to prevent dripping.
However, the last sweep will not happen if the vehicle is traveling above 170 km/h (106
mph).
■Effects of vehicle speed on wiper operation (vehicles with rain-sensing windshield wip-
ers)
Vehicle speed affects the following even when the wipers are not in AUTO mode.
●Intermittent wiper interval
●Wiper operation when the washer is being used (delay until drip prevention wiper
sweep occurs)
With low speed windshield wiper operation selected, wiper operation will be switched
from low speed to intermittent wiper operation only when the vehicle is stationary.
■Raindrop sensor (vehicles with rain-sensing windshield wipers)
●If the wiper is turned to AUTO mode while the power switch is in ON mode, the wipers
will operate once to show that AUTO mode is activated.
●If the temperature of the raindrop sensor is 85°C (185°F) or higher, or -30°C (-22°F)
or lower, automatic operation may not occur. In this case, operate the wipers in any
mode other than AUTO mode.
■When the windshield wipers are in temporary operation (vehicles with rain-sensing
windshield wipers)
AUTO mode cannot be activated even if is pressed.
■If no windshield washer fluid sprays
Check that the washer nozzles are not blocked if there is washer fluid in the windshield
washer fluid reservoir.
■Operation guide display (vehicles with rain-sensing windshield wipers only)
When the windshield wiper switch is operated to activate AUTO mode or when the rain-
sensing level is adjusted, the current status is displayed on the meters for a few seconds.
(→P. 1 1 8 )
●The raindrop sensor judges the amount of
raindrops.
An optical sensor is adopted. It may not oper-
ate properly when sunlight from the rising or
setting of the sun intermittently strikes the
windshield, or if bugs etc. are present on the
windshield.
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Page 247 of 612

2474-5. Using the driving support systems
4
Driving
IS300h_EE(OM53C61E)
■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 accel-
erating 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-information 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 immediately after
being activated, there may be a malfunction in the cruise control system. Have the vehi-
cle inspected by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
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Page 249 of 612
2494-5. Using the driving support systems
4
Driving
IS300h_EE(OM53C61E)
Dynamic radar cruise control supplements conventional cruise control 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 vehicles ahead.
Vehicle-to-vehicle distance button
Display
Set speed
Indicators
Cruise control switch
Dynamic radar cruise control∗
∗
: If equipped
Summary of functions
1
2
3
4
5
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Page 250 of 612
2504-5. Using the driving support systems
IS300h_EE(OM53C61E)
Press the “ON/OFF” button to acti-
vate the cruise control.
Dynamic 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)
1
2
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Page 252 of 612

2524-5. Using the driving support systems
IS300h_EE(OM53C61E)
Pressing the button changes the vehi-
cle-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 corre-
spond to a vehicle speed of 80 km/h (50 mph). Vehicle-to-vehicle distance
increases/decreases in accordance with vehicle speed.
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 approximately 40
km/h (25 mph).
Changing the vehicle-to-vehicle distance
Preceding
vehicle mark
1
2
3
Vehicle-to-vehicle distance settings
Distance optionsVehicle-to-vehicle distance
LongApproximately 50 m (160 ft.)
MediumApproximately 40 m (130 f t.)
ShortApproximately 30 m (100 ft.)
Canceling and resuming the speed control
1
2
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Page 254 of 612

2544-5. Using the driving support systems
IS300h_EE(OM53C61E)
When your vehicle is too close to a vehicle ahead, and sufficient automatic
deceleration via the cruise control is not possible, the display 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 appropriate vehicle-to-vehicle distance.
■Wa r n i n g s m a y n o t o c c u r w h e n
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
When constant speed control mode is selected, your vehicle will maintain a set
speed without controlling the vehicle-to-vehicle distance. Select this mode only
when vehicle-to-vehicle distance control mode does not function correctly due
to dirt etc.
Press the “ON/OFF” button to acti-
vate the cruise control.
Press the button again to deactivate the
cruise control.
Switch to constant speed control
mode.
(Push the lever forward and hold for
approximately 1 second.)
Constant speed control mode indicator will come on.
When in constant speed control mode, to return to vehicle-to-vehicle distance con-
trol 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 distance control mode.
Adjusting the speed setting: →P. 2 4 6
Canceling and resuming the speed setting: →P. 2 4 6
Approach warning
Selecting conventional constant speed control mode
1
2
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2564-5. Using the driving support systems
IS300h_EE(OM53C61E)
■Radar sensor and grille cover
Always keep the sensor and grille cover clean to ensure that the vehicle-to-vehicle dis-
tance control operates properly. (Some obstructions, such as snow, ice and plastic
objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
■Operation guide display
When the dynamic radar cruise control switch is operated, a guidance display is shown
on the meters for a few seconds as to how to operate the dynamic radar cruise control
switch or distance switch. (→P. 1 1 8 )
■Warning messages and buzzers for dynamic radar cruise control
Warning messages and buzzers are used to indicate a system malfunction or to inform
the driver of the need for caution while driving. (→P. 5 1 4 ) Grille cover
Radar sensor
1
2
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Page 261 of 612
2614-5. Using the driving support systems
4
Driving
IS300h_EE(OM53C61E)
While driving on a road that has lane markers, this system recognizes the lane
markers using a camera as a sensor to alert the driver when the vehicle deviates
from its lane.
If the system judges that the vehicle has deviated from its lane, it alerts the driver
using a buzzer and indications on the multi-information display.
Camera sensor
LDA (Lane Departure Alert)∗
∗
: If equipped
Summary of function
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