engine Lexus IS250 2006 Using the audio system / LEXUS 2006 IS350/250 THROUGH APRIL 2006 PROD. (OM53508U) Workshop Manual

115
2-3. Operating the lights and windshield wipers
2
When driving
■Automatic headlight leveling system (vehicles with discharge headlights)
The level of the headlights is automatically adjusted according to the number of
passengers and the loading condition of the vehicle to ensure that the headlights do
not interfere with other road users.
■If the indicator flashes... (vehicles with discharge headlights)
It may indicate a malfunction in th e system. Contact your Lexus dealer.
■Customization
Settings (e.g. light sensor sensitivity) can be changed. ( P. 3 9 5 )
NOTICE
■To prevent battery discharge
Do not leave the lights on longer than necessary when the engine is not running.

118
2-3. Operating the lights and windshield wipers
■The windshield wiper and washer can be operated when
The engine switch is in IG-ON mode.
■Effects of vehicle speed on wiper operation
Vehicle speed affects the following even when the wipers are not in AUTO mode.
●Intermittent wiper interval (INT mode)
●Wiper operation when the washer is being used (delay until drip prevention
wiper sweep occurs)
With LO selected, wiper operation will be switched from low speed to intermittent
wiper operation only when the vehicle is stationary.
(However, the mode cannot be switched wh en the adjustment dial for the intermit-
tent wiper interval is se t to the lowest setting.)
■Rain-sensing windshield wipers (if equipped)
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 and vehicle speed.
Sensor sensitivity (low)
Sensor sensitivity (high)
Rain-sensing wiper operation
Low speed wiper operation
High speed wiper operation
Temporary operation
Wash/wipe operation
Wipers operate automatically.
(After operating several times,
the wipers operate one more
time after a short delay to pre-
vent dripping.)

120
2-3. Operating the lights and windshield wipers
Headlight cleaner switch (if equipped)
■The headlight cleaner can be operated when
When the engine switch is in IG-ON mode and the headlight switch is turned ON.
NOTICE
■When the washer fluid tank is empty
Do not use this function when the washer fluid tank is empty. This may cause the
washer fluid pump to overheat.
Washer fluid can be sprayed on the headlights.
Press the switch to clean the
headlights.

124
2-4. Using other driving systems
Dynamic radar cruise control (if equipped)
Dynamic radar cruise control supplements conventional cruise control
with a vehicle-to-vehicle distance co ntrol. In the vehicle-to-vehicle dis-
tance control mode, the vehicle automa tically accelerates or decelerates
in order to maintain a set following distance from vehicles ahead.
■ Select cruise mode
Selecting vehicle-to-vehicle dis-
tance control modeTurn the ON-OFF button
ON.
Push the button once more to
deactivate.
Selecting conventional con-
stant speed control mode Turn the ON-OFF button
ON.
Push the button once more to
deactivate.
Vehicle-to-vehicle distance con-
trol mode is always reset when
the engine switch is switched to
IG-ON mode.
Switch to constant speed
control mode.
(push and hold for approxi-
mately one second)

126
2-4. Using other driving systems
■Changing the vehicle-to-vehicle distance
Each push of the switch changes
the vehicle-to-vehicle distance
Long
Medium
Short
The vehicle-to-vehicle distance
is automatically set to the long
mode when the engine switch is
switched to IG-ON mode.
A mark will be displayed to indi-
cate the presence of the vehicle
if a vehicle is running ahead of
you.
Preceding
vehicle mark

137
2-4. Using other driving systems
2
When driving
■Sensor detection information
●Certain vehicle conditions and the surrounding environment may affect the
ability of the sensor to correctly detect obstacles. Particular instances where this
may occur are listed below.
• There is dirt, snow or ice on the sensor.
• The sensor is frozen.
• The sensor is covered in any way.
• The vehicle is leaning considerably to one side.
• On an extremely bumpy road, on an incline, on gravel, or on grass.
• The vicinity of the vehicle is noisy due to vehicle horns, motorcycle engines,
air brakes of large vehicles, or other loud noises producing ultrasonic waves.
• There is another vehicle equipped with parking assist sensors in the vicinity.
• The sensor is coated with a sheet of spray or heavy rain
• The vehicle is equipped with a fender pole or wireless antenna.
• Towing eyelets are installed.
• The bumper or sensor receives a strong impact.
• The vehicle is approaching a tall or curved curb.
• In addition to the examples above, th ere are instances in which, because of
their shapes, signs and other objects may be judged by the sensor to be
closer than they are.
●The shape of the obstacle may prevent th e sensor from detecting it. Pay particu-
lar attention to the following obstacles.
• Wires, fences, ropes etc.
• Cotton, snow and other materials that absorb radio waves
• Sharply-angled objects
•Low obstacles
• Tall obstacles with upper sections projec ting outwards in the direction of your
vehicle
■When the display flashes and a message is displayed
 P. 3 3 4
■Certification (Canada only)
This ISM device compiles with Canadian ICES-001.
■Customization
Settings (e.g. buzzer volume) can be changed. ( P. 3 9 5 )

140
2-4. Using other driving systems
When the VSC/TRAC/hill-start assist control systems are operatingIf the vehicle is in danger of slip-
ping, rolling backwards when
starting on an incline, or if the rear
wheels spin, the slip indicator light
flashes to indicate that the VSC/
TRAC/hill-start assist control sys-
tems have been engaged.
A buzzer (intermittent) sounds to
indicate that VSC is operating.
The stop lights and high mounted
stoplight turn on when the hill-start
assist control system is operating.
■VDIM (Vehicle Dynamics Integrated Management) (IS350)
Provides integrated control of the ABS, BA, TRAC, VSC, hill-start assist
control, and EPS systems.
Maintains vehicle stability when swerving on slippery road surfaces by
controlling the brakes, engine output, and the movement of the front
wheels.
■ PCS (Pre-Collision System) (if equipped)
 P. 1 4 4

141
2-4. Using other driving systems
2
When driving
To disable TRAC (2WD vehicles only) If the vehicle gets stuck in fresh sn ow or mud, TRAC may reduce power
from the engine to the wheels. You may need to turn the system off to
enable you to rock the vehicle in order to free the vehicle.
Push the button to turn off
TRAC.
The slip indicator light should come
on.
Push the button again to turn the
system back on.
■Automatic TRAC reactivation (IS 350)
The TRAC system is reactivated when vehicle speed exceeds 30 mph (50 km/h)
even if TRAC OFF has been turned off.
■Sounds and vibrations caused by the ABS, BA, VSC, TRAC and hill-start assist
control systems
●A sound may be heard from the engi ne compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate that
a malfunction has occurred in any of these systems.
●Any of the following conditions may occur when the above systems are operat-
ing. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down s lightly after the ABS is activated.
■Hill-start assist control is operational when
●The shift lever is in the D or S position.
●The brake pedal is not depressed.

142
2-4. Using other driving systems
■Reduced effectiveness of EPS
The effectiveness of EPS is reduced to prevent the system from overheating when
there is frequent steering input over an extended period of time. The steering wheel
may feel heavy as a result. Should this occur, refrain from excessive steering input or
stop the vehicle and turn the engine OFF. The system should return to normal within
10 minutes.
CAUTION
Any of the following conditions may result in an accident which could cause death or
serious injury:
■The ABS does not operate effectively when
●The limits of tire gripping performance have been exceeded.
●The vehicle hydroplanes while driving at high speed on the wet or slick road.
■Stopping distance when the ABS is operating will exceed that of normal condi-
tions
The ABS is not designed to shorten the vehicle’s stopping dist ance. Always main-
tain a safe distance from the vehicle in front of you in the following situations.
●When driving on dirt, gravel or snow-covered roads
●When driving with tire chains
●When driving over bumps in the road
●When driving over roads with potholes or roads with uneven roads
■TRAC may not operate effectively when
Directional control and power may not be ac hievable while driving on slippery road
surfaces, even if the TRAC system is operating.
Do not drive the vehicle in conditions where stability and power may be lost.
■If hill-start assist control does not operate effectively
(vehicles with an automatic transmission)
The hill-start assist control may not operate effectively on steep inclines and roads
covered in ice.

151
2-5. Driving information
2
When driving
Winter driving tips
Carry out the necessary preparations and inspections before driving the
vehicle in winter. Always drive the vehicle in a manner appropriate to the
prevailing weather conditions.
■ Pre-winter preparations
●Use fluids that are appropria te to the prevailing outside tempera-
tures.
• Engine oil
• Engine coolant
• Washer fluid
• Have a service technician inspect the level and specific gravity
of battery electrolyte.
● Have the vehicle fitted with four snow tires or purchase a set of
tire chains for the rear tires.
Ensure that all tires are the same size and brand, and that chains match
the size of the tires.
● Tire pressure falls in winter as the outside temperature falls. Add
2.9 to 4.3 psi (20 to 30 kPa, 0.2 to 0.3 kgf/cm2 or bar) to the
standard tire inflation pressure.