brake sensor Lexus IS250 2008 Owner's Manual

144
2-3. Operating the lights and windshield wipers
08_IS350/250_U_(L/O_0708)
AFS (vehicles with discharge headlights)AFS (Adaptive Front—lighting System) improves visibility at intersections
and on curves by automatically adjusting the level of the headlights
according to vehicle speed and the degree of the tire angle that are con-
trolled by steering input.
Operates at speeds of 6 mph (10 km/h) or higher.
■ Deactivating AFS
How to switch: →P. 2 4 5
turns on when the AFS is deactivated.
■Daytime running light system
To make your vehicle more visible to other drivers, the headlights turn on automati-
cally (at a reduced intensity) whenever the engine is started and the parking brake
is released. Daytime running lights are not designed for use at night.
■Headlight control sensor
The sensor may not function properly if an
object is placed on the sensor, or anything
that blocks the sensor is affixed to the wind-
shield.
Doing so interferes with the sensor detecting
the level of ambient light and may cause the
automatic headlight system to malfunction.

158
2-4. Using other driving systems
08_IS350/250_U_(L/O_0708)
Driving in vehicle-to-vehicle distance control mode
This mode employs a radar sensor to detect the presence of vehicles
within 328 ft. (100 m) ahead and to judge the distance between your
vehicle and those vehicles.
Note that vehicle-to-vehicle distance will close when traveling on long down-
hill slopes.
Example of constant speed cruising (when there are no vehicles
ahead): When set to 62 mph (100 km/h)
The vehicle travels at the speed set by the driver. The desired vehicle-to-vehi-
cle distance can also be set by operating the vehicle-to-vehicle distance
switch.
Example of deceleration cruising (when the vehicle ahead is driving
slower than the set speed): When fixed speed cruising is set at 62 mph
(100 km/h) and the vehicle ahead is driving at 50 mph (80 km/h)
When a vehicle is detected running ahead of you, in the same lane, the sys-
tem automatically 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 on the vehicle ahead.
Example of follow-up cruising (when following a vehicle driving slower
than the set speed): When the speed is set to 62 mph (100 km/h) and
the vehicle ahead is driving at 50 mph (80 km/h)

162
2-4. Using other driving systems
08_IS350/250_U_(L/O_0708)
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 control of speed and could cause serious or
fatal accident.
●In heavy traffic
●On roads with sharp bends
●On winding roads
●On slippery roads, such as those covered with rain, ice or snow
●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 sensors
from functioning correctly (fog, snow, sandstorm, etc.)
●Where buzzer can be heard often
■When the radar 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 prox-
imity alarm (
→P. 369) will not be activated, and an 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

163
2-4. Using other driving systems
2
When driving
08_IS350/250_U_(L/O_0708)
CAUTION
■Conditions under which the vehicle-to-vehicle distance control may not function
correctly
Apply the brakes as necessary in the following conditions as the radar sensor may
not be able to correctly detect vehicles ahead, and an accident may result.
●When water or snow thrown up by the surrounding vehicles hinders the function-
ing of the sensor
●When your vehicle is pointing upwards (caused by a heavy load in the trunk, etc.)
●When the road curves or when the lanes are narrow
●When steering wheel operation or your position in the lane is unstable
■To ensure the radar sensor functions correctly
Do not do the following to the sensor or grille cover as doing so may cause the sen-
sor not to function correctly and could result in an accident.
●Stick or attach anything to them
●Leave them dirty
●Disassemble, subject them to strong shocks
●Modify or paint them
●Replace them with non-genuine parts

168
2-4. Using other driving systems
08_IS350/250_U_(L/O_0708)
■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 harsh sunlight or intense cold weather
In addition to the examples above, there 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 the 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 projecting outwards in the direction of your
vehicle
■When the display flashes and a message is displayed
→P. 3 6 9
■Certification (Canada only)
This ISM device compiles with Canadian ICES-001.

176
2-4. Using other driving systems
08_IS350/250_U_(L/O_0708)
PCS (Pre-Collision System) (if equipped)
Radar sensorDetects vehicles or other obsta-
cles on or near the road ahead and
determines whether a collision is
imminent based on the position,
speed, and heading of the obsta-
cles. Grille cover
Radar sensor
Safety systems such as the brakes and seat belts are automatically
engaged to lessen impact and injuries to occupants as well as vehicle dam-
age when the radar sensor detects an unavoidable frontal collision.
■Pre-collision seat belts
The seat belts are immediately retracted as the effect of the pretensioner is
increased (
→P. 53), to provide even greater constraining force to protect
the driver and passengers. In the even t of sudden braking or skidding, the
system will operate even if no obstacle has been detected.
■ Pre-collision brake assist
Applies greater braking force in relation to how strongly the brake pedal is
depressed.
■Obstacles not detected
The sensor cannot detect plastic obstacles such as pylons. There may also be occa-
sions when the sensor cannot detect pedestrians, animals, bicycles, motorcycles,
trees, or snowdrifts.

177
2-4. Using other driving systems
2
When driving
08_IS350/250_U_(L/O_0708)
■The pre-collision system is operational when
●Seat belt (linked to the radar sensor)
• Vehicle speed is above 3 mph (5 km/h).
• The speed at which your vehicle is approaching the obstacle or oncomingvehicle exceeds 18 to 24 mph (30 to 40 km/h).
• The front occupants are wearing a seat belt.
●Seat belts (linked to brake operation)
• Vehicle speed exceeds 9 mph (15 km/h).
• The system detects sudden braking or skidding.
• The front occupants are wearing a seat belt.
●Brake Assist
• Vehicle speed is above 18 mph (30 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle is greater than 18 to 24 mph (30 to 40 km/h).
• The brake pedal is depressed.
■Conditions that may trigger the system even if there is no danger of collision
●When there is an object by the roadside at the entrance to a curve
●When passing an oncoming vehicle on a curve
●When driving over a narrow iron bridge
●When there is a metal object on the road surface
●When driving on an uneven road surface
●When passing an oncoming vehicle on a left-turn
●When your vehicle rapidly closes on the vehicle in front
When the system is activated in the situations described above there is also a possi-
bility that the seat belts will retract quickly and the brakes will be applied with a force
greater than normal. When the seat belt is locked in the retracted position, stop the
vehicle in a safe place, release the seat belt and refasten.
■When there is a malfunction in the system
Warning lights and/or warning messages will turn on or flash. (
→P. 360, 369)

358
5-1. Essential information
08_IS350/250_U_(L/O_0708)
Event data recorder
In a crash or a near car crash eventThe SRS airbag sensor assembly contains the EDR. In a crash or a near
car crash event, this device may record some or all of the following infor-
mation:
● Engine speed
● Whether the brake pedal was applied or not
● Ve h i c l e s p e e d
● To what extent the accelerator pedal was depressed
● Position of the transmission shift lever
● Whether the driver and front passenger wore seat belts or not
● Driver's seat position
● SRS airbag deployment data
● SRS airbag system diagnostic data
If your vehicles is equipped with a vehicle stability control (VSC) system
The VSC Electronic Control Unit (ECU) may contain another EDR. In
case the VSC or Brake Assist system is activated, or the lateral accelera-
tion is beyond a certain valve, this device may record some or all of the
following information:
●Behavior of the vehicle
● Steering wheel angle
Your vehicle has computers that monitor and control certain aspects of
your vehicle. These computers assist in driving and maintaining optimal
vehicle performance.
Besides storing data useful for troubleshooting, there is an event data
recorder (EDR) that records data in a crash or a near car crash event.

449
Alphabetical index
08_IS350/250_U_(L/O_0708)
Bottle holders .......................................... 241
BrakeFluid ............................................................301
Parking brake ........................................ 129
Brake assist ............................................... 170
Care Exterior ....................................................274
Interior...................................................... 277
Seat belts ............................................... 278
Cargo capacity ....................................... 179
Cargo hooks ............................................ 261
CD changer ...............................................211
CD player....................................................211
Chains.........................................................183
Child restraint system Booster seats, definition.................... 95
Booster seats, installation ................. 99
Convertible seats, definition ........... 95
Convertible seats, installation ........ 99
Front passenger occupant classification system ........................ 90
Infant seats, definition ......................... 95
Infant seats, installation....................... 99
Installing CRS with lower anchorages ......................................... 102
Installing CRS with seatbelts .......... 99
Installing CRS with top straps .......103 Child safety
Airbag precautions ............................. 85
Battery precautions ............. 304, 399
Child restraint system .........................95
Child-protectors ...................................38
How your child should wear
the seatbelt............................................55
Installing child restraints.....................98
Moon roof precautions......................68
Power window lock switch .............. 64
Power window precautions ............65
Removed electronic key battery
precautions........................................326
Seat belt comfort guide ..................... 53
Seat belt extender precautions...... 57
Seat belt precautions ..........................56
Seat heater precautions......252, 254
Trunk precautions................................. 43
Child-protectors ......................................38
Cigarette lighter.................................... 249
Cleaning Exterior.................................................... 274
Interior ..................................................... 277
Seat belts ................................................278
Clock ......................................................... 244
Coat hooks ..............................................259
Compass .................................................. 269
Condenser ............................................... 301
Console box ........................................... 237
Cooling system Engine overheating.......................... 400
Cornering assist sensors .................... 164
Cruise control Cruise control....................................... 152
Dynamic radar cruise control....... 155
C

453
Alphabetical index
08_IS350/250_U_(L/O_0708)
MaintenanceDo-it-yourself maintenance ......... 286
General maintenance ..................... 282
Maintenance data .............................406
Maintenance requirements ..........280
Manual transmission............................. 126
Meter Instrument panel light control .........131
Meters .......................................................130
Micro dust and pollen filter ................ 196
Mirrors Inside rear view mirror ...................... 60
Side mirror heater .............................200
Side mirrors............................................... 61
Vanity mirrors ..................................... 243
Moon roof ...................................................66
MP3 disc ................................................... 217
Multi-information display.................... 139
Odometer .................................................130
Oil Engine oil ............................................... 295
Opener Fuel filler door ........................................ 69
Hood ....................................................... 289
Trunk ............................................................. 41
Outer foot lights Outer foot lights................................... 231
Wattage ................................................. 420
Outside rear view mirrors
Adjusting and folding ........................... 61
Mirror position memory ....................46
Outside temperature display............140
Overhead console .............................. 238 Overhead courtesy lights
Overhead courtesy lights ................231
Wattage ..................................................420
Overheating, Engine.......................... 400
Parking assist sensors .......................... 164
Parking brake .......................................... 129
Parking lights
Replacing light bulbs ........................ 342
Switch........................................................ 143
Wattage ..................................................420
PCS ..............................................................176
Personal lights Switch....................................................... 234
Power outlet............................................250
Power windows ........................................ 64
Pre-collision system...............................176
Radar cruise control............................. 155
Radiator ..................................................... 301
Radio .......................................................... 204
RDS ............................................................205
Rear sunshade ....................................... 256
Rear turn signal lights Replacing light bulbs ........................ 342
Wattage ..................................................420
Rear view mirror Compass................................................269
Rear window defogger ..................... 200
Replacing Electronic key battery ......................325
Fuses......................................................... 327
Light bulbs ............................................. 342
Reporting safety defects for
U.S. owners .......................................... 444M
O
P
R