2006 Lexus IS250 sensor

146
2-4. Using other driving systems
CAUTION
■Handling the radar sensor
Observe the following to ensure the pre-collision system can function effectively.
●Keep the sensor and front grille clean at all times.
Clean the sensor and front grille with a soft cloth so you do not mark or damage
them.
●Do not subject the sensor or surrounding area to a strong impact.
If the sensor moves even slightly off position, the system may malfunction. If the
sensor or surrounding area are subject to a strong impact, always have the area
inspected and adjusted by a Lexus dealer.
●Do not disassemble the sensor.
●Do not attach accessories or stickers to the sensor, grille guard or surrounding
area.
■Limitations of the pre-collision system
Do not rely on the pre-collision system. Always drive safely, taking care to observe
your surroundings and checking for any obstacles or other road hazards.

155
2-5. Driving information
2
When driving
NOTICE
■Repairing or replacing snow tires
Request repairs of and obtain replacement snow tires from Lexus dealers or legiti-
mate tire retailers.
This is because the removal and attachment of snow tires affects the operation of
the tire air pressure sensor.
■Fitting tire chains
The tire air pressure sensor may not functi on correctly when tire chains are fitted.

215
3-5. Other interior features
3
Interior features
■Items that can be set using the satellite switches
Lexus parking assist-sensor ( P. 133) ON/OFF
(if equipped)
Tire pressure warning system initialization
( P. 2 7 7 )
ID code selection for tire air pressure system
( P. 2 7 8 )
AFS (Adaptive Front-lighting System) ( P. 1 1 4 )
ON/OFF (if equipped)
Vehicle speed indicator ON/OFF and speed set-
ting ( P. 1 0 2 )
Tacho indicator ON/OFF and engine speed (rpm)
setting ( P. 103)

216
3-5. Other interior features
■Changing the settings
Each item is displayed and its setting can be changed only in the following condi-
tions:
Lexus parking assist-sensor: When the engine switch is in IG-ON mode.
Items other than the above: When the engine switch is in IG-ON mode and the
vehicle is stopped.
■Display
The display will return to the original disp lay if the satellite switches are not oper-
ated for an extended period.
Even if the display is in satellite switch mo de, it will switch in the event of a warning
or when the radar cruise control is used. If this occurs, press any of the satellite
switches or DISP switch on the steering wheel to return the display to satellite
switch mode.

241
3-5. Other interior features
3
Interior features
CAUTION
■While driving the vehicle
Do not adjust the display. Be sure to adjust the display only when the vehicle is
stopped.
■When doing the circling calibration
Be sure to secure a wide space, and watch out for people and vehicles in the neigh-
borhood. Do not violate any local traffic rules while performing circling calibration.
NOTICE
■To avoid the compass malfunctions
Do not place magnets or any metal objects near the inside rear view mirror.
Doing this may cause a malfunction of the compass sensor.
■To ensure normal operation of the compass
●Do not perform circling calibration of the compass in a place where the earth's
magnetic field is subject to interference by artificial magnetic fields.
●During calibration, do not operate electric systems (moon roof, power windows,
etc.) as they may interfere with the calibration.

276
4-3. Do-it-yourself maintenance
Turning directional tiresTire direction marks
The tires listed below are direc-
tional. The tire sidewalls are
marked with arrows indicating the
rolling direction of the tire. If
mounted on the wrong side of the
vehicle, directional tires will per-
form poorly.
Installing tire inflation pressure sensors
When replacing tires or wheels, new tire pressure sensors must also be
installed. Tire pressure sensors ca n be installed in any of the following
three ways:
● Sensors can be removed from the ol d wheels and installed on the new
wheels.
■ The tire pressure warning system
Your Lexus is equipped with a tire pressure warning system that uses
tire pressure sensors to detect low tire pressure before serious
problems arise. ( P. 331, 335)
Before removing the tire from th e wheel, remove the system’s tire
inflation pressure sensor. Be carefu l not to damage the sensor when
removing and installing the tires.
Ti r e s i z e
FrontRear
225/45R17 90W245/45R17 95W
225/40R18 88Y255/40R18 95Y

277
4-3. Do-it-yourself maintenance
4
Maintenance and care
●When replacing only the tire, the sensor already installed on the wheel
does not need to be replaced.
● Replacing both a wheel and its sensor.
When new tire pressure sensors are installed, new sensor ID codes must be
registered in the ECU and tire inflatio n pressure sensor must be initialized.
( P. 277, 278)
Initializing the tire pressure warning system
■ The tire pressure warning system must be initialized in the following
circumstances:
●When the standard tire pressure changes by replacing tires or
wheels
● When tires are rotated.
● When tire pressure sensors are replaced.
● When driving with the tires inflated to a higher than standard tire
pressure.
When the tire pressure warning sy stem is initialized, the current tire
pressure is set as the pressure benchmark.
■ How to initialize the tire pressure warning system
To initialize the system, use the satellite switch. ( P. 214)
Park the vehicle in safe place and turn off the engine.
Adjust the tire pressure to the specified pressure ( P. 3 7 8 )
Turn the engine switch to IG-ON mode.
Make sure to adjust the tire pressure to the specified level. The tire infla-
tion pressure warning system will operate based on this pressure level.
STEP1
STEP2
STEP3

278
4-3. Do-it-yourself maintenance
The tire pressure initialization
setting display
Continue to press the  or 
switch until the initialization setting
display appears.
It may take several minutes to com-
plete the setting. Wait for several
minutes before turning the engine
switch OFF if necessary.
Recording tire pressure settings
Press the ON/OFF button for
more than 3 seconds. At this time,
the tire inflation pressure warning
indicator flashes 3 times and the
message showing that the initial
setting is complete is displayed on
the multi-information display.
Registering and selecting tire inflation pressure sensor ID codesThe tire inflation pressure sensor is equipped with a unique ID code.
To select tire inflation pressure sensor ID codes, use the satellite switch.
( P. 214)
■ Registering ID codes
Two separate sets of ID codes can be registered for each vehicle. This
allows 2 separate sets of settings to be conveniently recorded for all
season and winter tires.
MAIN: The MAIN ID code is used fo r the factory installed tire pres-
sure sensors.
2nd: The 2nd ID code is used for tire inflation pressure sensors associ-
ated with a secondary set of tires.
Make sure to have all tire inflation pressure warning system ID codes regis-
tered by your Lexus dealer. ID codes must be reset when tires or wheels are
replaced.
STEP4