2014 Lexus IS250 brake sensor

2714-5. Using the driving support systems
4
Driving
IS250_EE(OM53C51E)
◆Pre-crash warning
When a high possibility of a frontal
collision is detected, the pre-crash
safety system warning light flashes, a
buzzer sounds and a message is
shown on the multi-information dis-
play to urge the driver to take eva-
sive action.
◆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.
The system may not warn the driver using a warning light, warning display and
buzzer when the system detects and judges braking operations.
◆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 deter-
mines that a collision is unavoidable, the brakes are automatically applied to
reduce the collision speed.
PCS (Pre-Crash Safety system)∗
∗
: If equipped
When the radar sensor detects the possibility of a frontal collision, brakes are
automatically engaged to lessen impact as well as vehicle damage.
The pre-crash safety system can be turned on and off as necessary by operat-
ing the switch. (→P. 2 7 2 )

2734-5. Using the driving support systems
4
Driving
IS250_EE(OM53C51E)
■The pre-crash safety system is operational when
The PCS OFF switch is not pressed and the following conditions are met:
●Pre-crash warning:
• Vehicle speed is greater than about 15 km/h (10 mph).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 15 km/h (10 mph).
●Pre-crash brake assist:
• The VSC OFF switch is not pressed.
• Vehicle speed is greater than about 30 km/h (19 mph).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 30 km/h (19 mph).
• The brake pedal is depressed.
●Pre-crash braking:
• The VSC OFF switch is not pressed.
• Vehicle speed is greater than about 15 km/h (10 mph).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 15 km/h (10 mph).
■Conditions that may trigger the system even if there is no danger of a 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 (left-hand drive vehicles) or right-turn
(right-hand drive vehicles)
●When your vehicle rapidly closes on the vehicle in front
●When a grade separation/interchange, sign, billboard, or other structure appears to be
directly in the vehicle’s line of travel
●When there is a metal plate in the road in front of the vehicle on a downhill slope
●When climbing a steep hill causes an overhead billboard or other metallic structure to
appear directly in the vehicle’s line of travel
●When driving under an overpass
●When an extreme change in vehicle height occurs
●When passing through certain toll gates
●When passing through a tunnel
●When the radar sensor moves off position due to its surrounding area being subjected
to a strong impact
When the system is activated in the situations described above, there is also a possibility
that the brakes will be applied with a force greater than normal.

2774-5. Using the driving support systems
4
Driving
IS250_EE(OM53C51E)
CAUTION
■Limitations of the pre-crash safety system
Do not overly rely on the pre-crash safety system. Always drive safely, taking care to
observe your surroundings and checking for any obstacles or other road hazards.
Failure to do so may cause an accident resulting in death or serious injury.
■Handling the radar sensor
Observe the following to ensure the pre-crash safety system can function effectively.
Otherwise, the system may not function correctly and could result in an accident.
●Keep the sensor and grille cover clean at all times.
Clean the sensor and 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 malfunction. If the sen-
sor 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 surrounding area.
●Do not modify or paint the sensor and grille cover.
●Do not replace them with non-genuine parts.
■Cautions regarding the assist contents of the system
By means of alarms and brake control, the pre-crash safety system is intended to assist
the driver in avoiding collisions through the process of LOOK-JUDGE-ACT. There are
limits to the degree of assistance the system can provide, so please keep in mind the
following important points.
●Assisting the driver in watching the road
The pre-crash safety system is only able to detect obstacles directly in front of the
vehicle, and only within a limited range. It is not a mechanism that allows careless or
inattentive driving, and it is not a system that can assist the driver in low-visibility con-
ditions. It is still necessary for the driver to pay close attention to the vehicle’s sur-
roundings.
●Assisting the driver in making correct judgment
When attempting to estimate the possibility of a collision, the only data available to
the pre-crash safety system is that from obstacles it has detected directly in front of
the vehicle. Therefore, it is absolutely necessary for the driver to remain vigilant and
to determine whether or not there is a possibility of collision in any given situation.
●Assisting the driver in taking action
The pre-crash safety system’s braking assist feature is designed to help reduce the
severity of a collision, and so only acts when the system has judged that a collision is
unavoidable. This system by itself is not capable of automatically avoiding a collision
or bringing the vehicle to a stop safely. For this reason, when encountering a danger-
ous situation the driver must take direct and immediate action in order to ensure the
safety of all involved.

4848-2. Steps to take in an emergency
IS250_EE(OM53C51E)
Indicates that:
• The brake fluid level is low; or
• The brake system is malfunctioning
A buzzer also sounds.
→Immediately stop the vehicle in a safe place and
contact any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.
Continuing to drive the vehicle may be dangerous.
Indicates that one or more of the doors is not fully closed
The system also indicates which doors are not fully
closed.
If the vehicle reaches a speed of 5 km/h (3 mph),
flashes and a buzzer sounds to indicate that
the door(s) are not yet fully closed.
→Make sure that all the doors are closed.
Indicates that the hood is not fully closed
If the vehicle reaches a speed of 5 km/h (3 mph),
flashes and a buzzer sounds to indicate that
the hood is not yet fully closed.
→Close the hood.
Indicates that the trunk is not fully closed
If the vehicle reaches a speed of 5 km/h (3 mph),
flashes and a buzzer sounds to indicate that
the trunk is not yet fully closed.
→Close the trunk.
(If equipped)
Indicates a malfunction in the Lexus parking assist-sen-
sor
The assist-sensors flash.
A buzzer also sounds.
→Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
(If equipped)
Indicates that a Lexus parking assist-sensor is dirty or
covered with ice
A buzzer also sounds.
→Clean the sensor.
Wa r n i n g m e s s a g eDetails/Actions

5068-2. Steps to take in an emergency
IS250_EE(OM53C51E)
CAUTION
■When using the compact spare tire
●Remember that the compact spare tire provided is specifically designed for use with
your vehicle. Do not use your compact spare tire on another vehicle.
●Do not use more than one compact spare tires simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking.
■When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may not
operate correctly:
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 80 km/h (50 mph) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to observe
this precaution may lead to an accident causing death or serious injury.
■After using the tools and jack
Before driving, make sure all the tools and jack are securely in place in their storage
location to reduce the possibility of personal injury during a collision or sudden brak-
ing.
NOTICE
■Driving with tire chains and the compact spare tire
Do not fit tire chains to the compact spare tire.
Tire chains may damage the vehicle body and adversely affect driving performance.
■When replacing the tires (vehicles with a tire pressure warning system)
When removing or fitting the wheels, tires or the tire pressure warning valve and trans-
mitter, contact any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional as the tire pressure warning valve and transmitter may be dam-
aged if not handled correctly.
• ABS & Brake assist
•VSC
•TRC
• Cruise control (if equipped)
• Dynamic radar cruise control
(if equipped)
•PCS (if equipped)
•EPS• LDA (Lane departure alert)
(if equipped)
• Rear view monitor system
(if equipped)
• Lexus parking assist monitor
(if equipped)
• Lexus parking assist-sensor
(if equipped)
• Navigation system (if equipped)

566What to do if... (Troubleshooting)
IS250_EE(OM53C51E)
●Is the window lock switch pressed?
The power window except for the one at the driver’s seat cannot be operated
if the window lock switch is pressed. (→P. 1 6 7 )
●The auto power off function will be operated if the vehicle is left in ACCES-
SORY or IGNITION ON mode (the engine is not running) for a period of
time. (→P. 1 9 4 )
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? (→P. 4 7 8 )
●The parking brake indicator is on
Is the parking brake released? (→P. 2 0 5 )
Depending on the situation, other types of warning buzzer may also sound.
(→P. 4 76 , 4 8 2 )

●Did anyone inside the vehicle open a door or anything move inside the vehicle
during setting the alarm?
The sensor detects them and the alarm sounds. (→P. 8 3 )
To stop the alarm, turn the engine switch to IGNITION ON mode or start the
engine.The windows do not open or close by operating the power window
switches
The engine switch is turned off automatically
A warning buzzer sounds during driving
An alarm is activated and the horn sounds (if equipped)

578Alphabetical index
IS250_EE(OM53C51E)
Navigation system*
Needle ....................................................... 102
Odometer................................................... 95
Oil
Differential oil .......................................545
Engine oil .................................................541
Opener
Hood ..........................................................415
Trunk ..........................................................125
Outer foot lights
Location................................................. 389
Replacing light bulbs........................ 457
Wattage................................................. 548
Outside rear view mirrors ................. 163
Adjusting and folding.........................163
BSM (Blind Sport Monitor).......... 278
Linked mirror function
when reversing................................. 165
Mirror position memory.................... 151
Outside rear view mirror
defoggers .......................................... 382
Outside temperature ............................. 95
Overheating ............................................ 531Paddle shift switches .............................199
Parking assist sensors..........................247
Parking brake......................................... 205
PCS
(Pre-Crash Safety system).............. 271
Function.................................................... 271
PCS OFF switch................................. 272
Warning light........................................ 477
Personal lights........................................ 390
Wattage ................................................. 548
Pollen removal mode.......................... 382
Pop-up display.........................................102
Pop Up Hood............................................ 54
Power easy access system .................. 151
Power outlet ........................................... 399
Power steering (Electric power
steering system)................................. 265
Warning light........................................ 477
Power windows ....................................... 167
Door lock linked window
operation.............................................. 169
Jam protection function ...................168
Operation ............................................... 167
Window lock switch .......................... 167
Pre-Crash Safety system (PCS) ...... 271
Function.................................................... 271
PCS OFF switch................................. 272
Warning light........................................ 477
N
O
P

582Alphabetical index
IS250_EE(OM53C51E)
Speedometer ............................................ 95
Speed indicator ...................................... 102
Sport mode.............................................. 263
Steering lock ............................................ 194
Column lock release..........................194
Steering wheel ........................................ 159
Adjustment............................................. 159
Audio switches................................... 300
Heated steering wheel.................... 387
Power easy access system .............. 151
Steering wheel position
memory.................................................. 151
Stop lights
Emergency brake signal ................ 266
Replacing light bulbs..........................461
Storage feature....................................... 391
Stuck
If the vehicle becomes stuck ........534
Sun visors ................................................ 398
Sun shade
Rear ......................................................... 400
Roof ..............................................................171 switch settings ..................................102
Switches
Audio remote control
switches ..............................................300
Automatic High Beam switch..... 209
BSM (Blind Spot Monitor)
switch ................................................... 278
Cruise control switch ...........225, 229
Door lock switches............................... 121
Driving mode select switch.......... 263
Driving position memory
switches ..................................................151
Emergency flashers switch........... 466
Engine switch ........................................ 192
Fog light switch..................................... 213
Heated steering wheel switch .... 387
Ignition switch ....................................... 192
LDA (Lane Departure
Alert) switch ..................................... 242
Lexus parking assist-sensor
switch .................................................... 247
Light switch........................................... 206
Meter control switches...................... 101
Moon roof switches ........................... 170
Outside rear view mirror
switches ................................................ 163
Paddle shift switches.......................... 199
PCS OFF switch................................. 272
Power door lock switch..................... 121