2011 Lexus IS F sensor

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2-3. Operating the lights and windshield wipers
IS F_EE
Light reminder buzzer
A buzzer sounds when the “ENGINE START STOP” switch is turned OFF
or switched to ACCESSORY mode and the driver's door is opened while the
lights are turned on.
Automatic headlight leveling system
The level of the headlights is automatically adjusted according to the num-
ber of passengers and the loading condition of the vehicle to ensure that the
headlights do not interfere with other road users.
Customization that can be configured at any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
Settings of the light sensor sensitivity can be changed.
(Customizable features P. 484)
NOTICE
To prevent battery discharge
Do not leave the lights on longer than necessary when the engine is not run-
ning.

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2-3. Operating the lights and windshield wipers
IS F_EE
Windshield wipers and washer
With “AUTO” selected, the wipers will operate automatically when
the sensor detects falling rain. The system automatically adjusts wiper
timing in accordance with rain volume.
Rain-sensing wiper opera-
tion
Low speed wiper operation
High speed wiper opera-
tion
Temporary operation
Washer/wiper dual opera-
tion
Wipers operate automati-
cally. (After operating several
times, the wipers operate one
more time after a short delay
to prevent dripping.)

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2-3. Operating the lights and windshield wipers
2
When driving
IS F_EE
The windshield wipers and washer can be operated when
The “ENGINE START STOP” switch is in IGNITION ON mode.
Effects of vehicle speed on wiper operation
With the settings other than “AUTO” also, the time until drip prevention
wiper sweep occurs is changed depending on vehicle speed.
Low speed wiper operation selected, wiper operation will be switched from
low speed to intermittent wiper operation only when the vehicle is station-
ary.
“AUTO” mode
If the wiper switch is turned to the “AUTO” position while the
“ENGINE START STOP” switch is in IGNITION ON mode, the wiper
will operate once to show that auto mode is activated.
If the temperature of the raindrop sensor is 90C (194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”.
Outside rear view mirror defogger activation linked to windshield wiper
operation
The outside rear view mirror defogger automatically turns on when you
operate the windshield wipers.
The raindrop sensor judges the
amount of raindrops.
The sensitivity of sensor can be
adjusted by turning the knob.
Increases the sensitivity
Decreases the sensitivity

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2-3. Operating the lights and windshield wipers
IS F_EE
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.
Customization that can be configured at any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
Settings (e.g. drip prevention function) can be changed.
(Customizable features P. 484)
CAUTION
Caution regarding the use of windshield wipers in “AUTO” mode
The windshield wipers may operate unexpectedly if the sensor is touched or
the windshield is subject to vibration in “AUTO” mode. Take care that your
fingers etc. do not become caught in the windshield wipers.
NOTICE
When the windshield is dry
Do not use the wipers, as they may damage the windshield.
When a nozzle becomes blocked
Do not try to clear it with a pin or other object. The nozzle will be damaged.
When there is no washer fluid spray from the nozzle
Damage to the washer fluid pump may be caused if the lever is pulled
toward you and held continually.

189
2-4. Using other driving systems
2
When driving
IS F_EE
Driving in vehicle-to-vehicle distance control mode
This mode employs a radar sensor to detect the presence of vehi-
cles up to approximately 120 m (400 ft.) ahead, determines the cur-
rent 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
distance 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 automat-
ically decelerates your vehicle. When a greater reduction in vehicle
speed is necessary, 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.

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2-4. Using other driving systems
IS F_EE
Adjusting the speed setting:
P. 1 8 6
Canceling and resuming the
speed setting: P. 188
Dynamic radar cruise control can be set when
The shift lever is in D.
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).
VSC is activated.
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 the “AUTO” mode or the high speed wiper operation
position).
When snow mode is set.
If vehicle-to-vehicle distance control driving is automatically canceled for
any other reason, there may be a malfunction in the system. Contact any
authorized Lexus dealer or repairer, or another duly qualified and equipped
professional.

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2-4. Using other driving systems
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When driving
IS F_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.
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 and plastic objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
Warning lights, messages and buzzers for dynamic radar cruise control
Warning lights, messages and buzzers are used to indicate a system mal-
function or to inform the driver of the need for caution while driving. (P.
425, 431)
Grille cover
Radar sensor

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2-4. Using other driving systems
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When driving
IS F_EE
CAUTION
Situations unsuitable for dynamic radar cruise control
Do not use dynamic radar cruise control in any of the following situations.
Doing so may result in inappropriate speed control and could cause an acci-
dent 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 and snow
On steep downhills, or where there are sudden changes between sharp up
and down gradients
At entrances to expressways
When weather conditions are bad enough that they may prevent the sen-
sors from functioning correctly (fog, snow, sandstorm, heavy rain, etc.)
Vehicle speed may exceed the set speed when driving down a steep hill.
When an approach warning buzzer is heard often
When the sensor may not be correctly detecting the vehicle ahead
Apply the brakes as necessary when any of the following types of vehicles
are in front of you.
As the sensor may not be able to correctly detect these types of vehicles, the
approach warning (P. 190) will not be activated, and a fatal or serious
accident may result.
Vehicles that cut in suddenly
Vehicles traveling at low speeds
Vehicles that are not moving
Vehicles with small rear ends (trailers with no load on board etc.)
Motorcycles traveling in the same lane