2010 Lexus HS250h lights

195
2-3. Operating the lights and windshield wipers
2
When driving
Windshield wipers and washer
Intermittent windshield wipers with interval adjuster (if equipped)
The wiper operation is selected as follows by turning the switch ring.
When intermittent windsh ield wiper oper
ation is selected, wiper inter-
vals can be also adjusted.
Intermittent wind-
shield wiper operation
Low speed windshield
wiper operation
High speed wind -
shield wiper operation
Temporary operation
Increases the intermittent
windshield wiper frequency
Decreases the intermittent
windshield wiper frequency

196
2-3. Operating the lights and windshield wipers
Washer/wiper dual operation
The wipers will automatically
operate a couple of times after
the washer squirts.
If the headlights are on, the
headlight
cleaners will operate
once. ( P. 2 0 0 )
Rain-sensing windshield wipers (if equipped)
When is selected, the wipers will oper
ate automatically when
the sensor detects falling rain. Th e s
ystem automatically adjusts wiper
timing in accordance with rain volume and vehicle speed.
When is selected, the sensor sensit ivity can be adjusted as fol-
lows by turning the switch ring:
Rain-sensing wiper
operation
Low speed wiper
operation
High speed wiper
operation
Temporary operation

197
2-3. Operating the lights and windshield wipers
2
When driving
■The windshield wipers and wa sher can be operated when
The “POWER” switch is in ON mode.
■Effects of vehicle speed on wiper operation (vehicles with rain-sensing wind -
shield wipers)
Even when the wipers are not in AUTO mode, wiper operation varies depending
on v
ehicle speed when the washer is being used (delay until drip prevention wiper
sweep occurs).
Increases the sensitivity
Decreases the sensitivity
Washer/wiper dual operation
The wipers will automatically
operate a couple of times after
the washer squirts. 
(After operating several times,
the wiper
s operate one more
time after a short delay to pre -
vent dripping.)
If the headlights are on, the
headlight
cleaners will operate
once. ( P. 2 0 0 )

198
2-3. Operating the lights and windshield wipers
■Raindrop sensor (vehicles with rain-sensing windshield wipers)
If the wiper switch is turned to the position while the “POWER” switch is in
ON mode, the wipers will operate once to show that AUTO mode is activated.
■In extremely hot or cold weather (vehicles with rain-sensing windshield wipers)
The system will turn off if the windshield gets extremely hot (more than 194 F
[90 C]) or cold (less than 14 F [-10C]).
If it does not operate, use other than AUTO mode.
■If no windshield washer fluid sprays
Check that the washer nozzles are not blocked if there is washer fluid in the washer
fluid tank.
CAUTION
■Caution regarding the use of windshield wipers in “AUTO” mode (vehicles with
rain-sensing windshield wipers)
The windshield wipers may operate unexpect edly 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.
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.

199
2-3. Operating the lights and windshield wipers
2
When driving
NOTICE
■When the windshield is dry
Do not use the wipers, as they may damage the windshield.
■When the washer fluid tank is empty
Do not operate the switch continually as the washer fluid pump may overheat.
■When a nozzle becomes blocked
Do not try to clear it with a pin or other object. The nozzle will be damaged.
■To prevent 12-volt battery discharge
Do not leave the wipers on longer than necessary when the hybrid system is off.

200
2-3. Operating the lights and windshield wipers
Headlight cleaner switch
: If equipped
■The headlight cleaners can be operated when
The “POWER” switch is in ON mode an d the
headlight switch is turned on.
■Windshield washer linked operation
●When the windshield washer is operated with the “POWER” switch in ON
mode and the headlights on, the he adlight cleaners will operate once. 
(  P. 1 9 5 )
●From the second time the windshield wa sher is operated, the headlight cleaner
will not operate in sync with the windshield washer. 
(Turning the “POWER” switch to OFF or the lo
w beam headlights off resets the
headlight cleaner synchronization mode.)
NOTICE
■When the washer fluid tank is empty
Do not press the switch continually as the washer fluid pump may overheat.
Washer fluid can be sprayed on the headlights.
Press the switch to clean the
headlights.

213
2-4. Using other driving systems
2
When driving
■Vehicle-to-vehicle distance settings
Select a distance from the table below. Note that the distances shown correspond
to a vehicle speed of 50 mph (80 km/h). Vehicle-to-vehicle distance increases/
decreases in accordance with vehicle speed.
■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 plas-
tic objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canc eled if an obstruction is detected.
■Warning lights, messages and buzzer s for dynamic radar cruise control
Warning lights, messages and buzzers are us ed to indicate a system malfunction or
to inform the driver of the need for caution while driving. ( P. 493, 502, 505)
■Approach warning
In the following instances, there is a possibility that the warnings will not occur:
●When the speed of the vehicle ahead ma tches 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
Distance optionsVehicle-to-vehicle distance
LongApproximately 160 f t. (50 m)
MediumApproximately 130 ft. (40 m)
ShortApproximately 100 f t. (30 m)
Grille cover
Radar sensor

221
2-4. Using other driving systems
2
When driving
●The vehicle speed deviates from the operating range of the LKA system func-
tions.
●When the lane lines cannot be recognized while driving.
●Low speed or high speed wiper operation states. 
The buzzer may not beep when the LKA system functions are canceled
because the notification of dynamic radar cruise control cancellation takes pri-
ority over the LKA system and cancels the function.
●The no-handed driving warning activates while the lane keeping assist function
is active. (The buzzer will beep twice.)
■No-handed driving warning
If the steering wheel is not operated for about 15 seconds on a straight road or
about 5 seconds on a curve, the buzzer will beep twice, indicators on the multi-
information display will flash, and the lane keeping assist function will be temporarily
canceled. If you drive the vehicle with your hands lightly touching the steering
wheel, this may also be detected as no-handed driving.
■When the vehicle has been parked in the sun
The LKA system functions may not be available for a while after driving has started.
In such cases, turn the LKA system off and turn it on again after normal temperature
returns. When the temperature in the cab in decreases and the temperature around
the camera sensor becomes suitable for it s operation, the functions will begin to
operate.
■Warning lights and messages for LKA
Warning lights and messages ar e used to indicate a system malfunction or to inform
the driver of the need for caution while driving. ( P. 493, 505)