2012 Lexus GS250 radar

2734-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
CAUTION
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 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 malfunc-
tion. If the sensor or surrounding area is subject to a strong impact, always
have the area inspected and adjusted by a 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.

2774-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
Lane departure warning function
When the vehicle speed is approximately 48 km/h (30 mph) or
more
When the lane width is more than approximately 2.8 m (9.1
ft.)
When driving on a straight road or through a curve with a
radius of more than approximately 120 m (394 ft.)
Lane keeping assist function
When the vehicle speed is between approximately 72 and 180 km/
h (45 and 112 mph)
When the vehicle-to-vehicle distance mode of the radar cruise
control is on, and the set vehicle speed is approximately 72
km/h (45 mph) or more (the function will not operate when the
radar cruise control is in set speed mode)
When the lane width is between approximately 2.8 and 4.0 m
(9.1 and 13.1 ft.)
When driving on a straight road or through a curve with a
radius of more than approximately 230 m (755 ft.)
Operating conditions for each function

2784-5. Using the driving support
GS350/250_EE (OM30C36E)When the LKA system is on, the lane line display and steering
wheel display are shown.
Lane keeping assist function
operation indication
Steering wheel displayed:
Indicates that the function is cur-
rently operating. (If the lane depar-
ture warning operates at this time,
the steering wheel flashes orange.)
Steering wheel not displayed:
Indicates that the function is not
currently operating. (When the
lane keeping assist function is can-
celed, the buzzer will beep twice.)
Dynamic radar cruise control
display
Lane departure warning func-
tion indication (when the
inside of the white line is
white):
The function has recognized lane
markers. (If the lane departure
warning operates at this time, the
lines flash orange.)
Lane departure warning func-
tion indication (when the
inside of the white line is
black):
A lane marker is not recognized by
the system, or the LKA system
functions are temporarily canceled.
Indication on the multi-information display
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3434-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
PCS (Pre-Crash Safety system)
Pre-crash seat belts (front seat only)
If the pre-crash sensor detects that a collision is unavoidable, the
pre-crash safety system will retract the seat belt before the colli-
sion occurs.
The same will happen if the driver makes an emergency braking
or loses control of the vehicle. (P. 40)
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.

: If equipped
When the radar sensor detects that a frontal collision is highly
likely or even unavoidable, safety systems such as the brakes and
seat belts 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 operating the switch. (P. 344)

3454-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)The radar sensor detects vehicles
or other obstacles on or near the
road ahead and determines
whether a collision is imminent
based on the position, speed, and
heading of the obstacles.
The driver monitor sensor
detects the direction the driver is
facing and whether the driver’s
eyes are open or closed.
The system determines whether
the driver is facing forward and
whether or not the driver’s eyes
are closed.
Radar sensor
Driver monitor sensor (if equipped)

3514-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
CAUTION
Limitations of the pre-crash safety system
Do not overly rely on the pre-crash safety system. Always drive safely, tak-
ing 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 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.
Determining the direction the driver is facing and whether the driver’s eyes
are open or closed
The direction the driver is facing and whether the driver’s eyes are open or
closed may not be determined correctly if the following conditions exist:
There is an object between the driver monitor sensor and the driver’s face,
such as when the sensor is blocked.
A part of the driver’s face is covered.
The sensor or the driver’s face is exposed to intense light such as sunlight.
The driving posture is improper.

3544-5. Using the driving support
GS350/250_EE (OM30C36E)
BSM (Blind Spot Monitor)
: If equipped
The Blind Spot Monitor is a system that assists the driver to con-
firm safety when changing lanes.
The system uses radar sensors to detect vehicles that are traveling
in an adjacent lane in the area that is not reflected in the outside
rear view mirror (the blind spot), and advises the driver of the vehi-
cles existence via the outside rear view mirror indicator.
BSM main switch
Pressing the switch turns the system on or off. When the switch is set to
on, the switch’s indicator illuminates.
Outside rear view mirror indicator
When a vehicle is detected in the blind spot, the outside rear view mirror
indicator on that side illuminates. If the turn signal lever is operated when
a vehicle is in the blind spot, the outside rear view mirror indicator
flashes.
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3614-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
CAUTION
Cautions regarding the use of the system
The driver is solely responsible for safe driving. Always drive safely, taking
care to observe your surroundings.
The Blind Spot Monitor is a supplementary system which alerts the driver
that a vehicle is present in the blind spot. Do not overly rely on the Blind
Spot Monitor system. The system cannot judge if it is safe to change lanes,
therefore over reliance could cause an accident resulting in death or serious
injury. According to conditions, the system may not function correctly.
Therefore the driver’s own visual confirmation of safety is necessary.
Handling the radar sensor
One Blind Spot Monitor sensor is installed inside the left and right side of
the vehicle rear bumper respectively. Observe the following to ensure the
Blind Spot Monitor system can function correctly.
Do not subject the sensor or surrounding area on the bumper to a strong
impact. If the sensor moves even slightly off position, the system may
malfunction and vehicles that enter the detection area may not be
detected. If the sensor or surrounding area is subject to a strong impact,
always have the area inspected 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 or surrounding area on
the bumper.
Do not modify the sensor or surrounding area on the bumper.
Do not paint the sensor or surrounding area on the bumper.
Keep the sensor and its surrounding
area on the bumper clean at all times.