2011 Lexus IS220d brake sensor

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IS250/220d/200d_EE
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2-1. Driving procedures
Driving the vehicle ............. 142
Engine (ignition) switch ..... 153
Automatic transmission...... 158
Manual transmission .......... 165
Turn signal lever ................ 167
Parking brake ..................... 168
Horn ................................... 170
2-2. Instrument cluster
Gauges and meters ............. 171
Indicators and warning lights ....
177
Multi-information display .. 181
2-3. Operating the lights and
windshield wipers
Headlight switch ................ 186
Fog light switch.................. 190
Windshield wipers and
washer .............................. 191
Headlight cleaner switch .... 1972-4. Using other driving systems
Cruise control ..................... 198
Dynamic radar cruise
control .............................. 202
Lexus parking assist-sensor 217
Driving assist systems ........ 223
PCS (Pre-Crash Safety
system) ............................. 229
2-5. Driving information
Cargo and luggage ............. 237
Winter driving tips ............. 239
Trailer towing..................... 242
3-1. Using the air conditioning
system and defogger
Automatic air
conditioning system ......... 254
Power heater....................... 262
Rear window and outside
rear view mirror
defoggers .......................... 264
Windshield wiper de-icer ... 265
2When driving
3Interior features

2When driving
141
2-1. Driving procedures
Driving the vehicle........... 142
Engine (ignition) switch... 153
Automatic transmission ... 158
Manual transmission ........ 165
Turn signal lever .............. 167
Parking brake ................... 168
Horn ................................. 170
2-2. Instrument cluster
Gauges and meters ........... 171
Indicators and warning
lights .............................. 177
Multi-information display 1812-3. Operating the lights and wind-
shield wipers
Headlight switch .............. 186
Fog light switch ............... 190
Windshield wipers and
washer ............................ 191
Headlight cleaner switch . 197
2-4. Using other driving
systems
Cruise control .................. 198
Dynamic radar cruise
control ............................ 202
Lexus parking
assist-sensor ................... 217
Driving assist systems ..... 223
PCS (Pre-Crash Safety
system)........................... 229
2-5. Driving information
Cargo and luggage ........... 237
Winter driving tips ........... 239
Trailer towing .................. 242

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2-4. Using other driving systems
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When driving
IS250/220d/200d_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
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When driving
IS250/220d/200d_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 your vehicle is towing a trailer or during emergency towing
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. 208) 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

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2-4. Using other driving systems
IS250/220d/200d_EE
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 sen-
sor may not be able to correctly detect vehicles ahead, and a fatal or serious
accident may result:
When water or snow thrown up by the surrounding vehicles hinders the
functioning 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
When the vehicle ahead of you decelerates suddenly
Handling the radar sensor
Observe the following to ensure the cruise control system can function
effectively.
Otherwise, the system may not function correctly and could result in an
accident.
Keep the sensor and front grille cover clean at all times.
Clean the sensor and front grille cover 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 malfunc-
tion. If the sensor or surrounding area is subject to a strong impact, always
have the area inspected and adjusted by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
Do not disassemble the sensor.
Do not attach accessories or stickers to the sensor, grille cover or sur-
rounding area.
Do not modify or paint the sensor and grille cover.
Do not replace them with non-genuine parts.

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2-4. Using other driving systems
IS250/220d/200d_EE
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
particular 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
If the display flashes and a message is displayed
P. 4 7 3
Customization that can be configured at any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
Settings (e.g. buzzer volume) can be changed. (Customizable features P.
556)

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2-4. Using other driving systems
IS250/220d/200d_EE
PCS (Pre-Crash Safety system)
When the radar sensor detects possibility of a frontal collision, the pre-
crash safety system such as the brakes and seat belts are automatically
engaged to lessen impact and injuries to occupants as well as vehicle
damage.
Pre-crash seat belts
If the pre-crash sensor detects that a collision is unavoidable, the
pre-crash safety system will retract the seat belt before the collision
occurs.
The same will happen if the driver makes an emergency braking or
loses control of the vehicle. (P. 7 6 )
However, the system will not operate in the event of skidding when
the VSC systems are disabled.
Pre-crash brake assist
When there is a high possibility of a frontal collision, the system
applies greater braking force in relation to how strongly the brake
pedal is depressed.
Pre-crash braking
When there is a high possibility of a frontal collision, the system
warns the driver using a warning light, warning display and buzzer.
If the system determines that a collision is unavoidable, the brakes
are automatically applied to reduce the collision speed. The pre-

: If equipped

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2-4. Using other driving systems
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When driving
IS250/220d/200d_EE
Disabling the pre-crash braking
The pre-crash braking function
can be turned on and off using
the satellite switch. (P. 365)
Press “”or “” to display the
PCS brake setting ( ). Then,
press the “ON/OFF” button in
the middle of the switch to
select either “ON” or “OFF”
().
It may take approximately 3
seconds for the display to
change after the satellite switch
is operated.
The “PCS” warning light
flashes when “OFF” is selected.
Radar sensor
Detects vehicles or other obsta-
cles on or near the road ahead
and determines whether a colli-
sion is imminent based on the
position, speed, and heading of
the obstacles.
Grille cover
Radar sensor
Obstacles not detected
The sensor cannot detect plastic obstacles such as pylons. There may also be
occasions when the radar sensor cannot detect pedestrians, animals, bicy-
cles, motorcycles, trees, or snowdrifts.