sensor Lexus GS250 2012 Workshop Manual

2944-5. Using the driving support
GS350/250_EE (OM30C36E)
Lexus parking assist-sensor display
When an obstacle is detected while the rear view monitor system, is in use,
the warning indicator will appear in the top right of the screen even if the dis-
play setting has been set to off.
Sensor detection information
The sensor’s detection areas are limited to the areas around the vehicle’s
front corner and rear bumpers.
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. (Wiping the sensors will resolve
this problem.)
• The sensor is frozen. (Thawing the area will resolve this problem.)
In especially cold weather, if a sensor is frozen the screen may show an
abnormal display, or obstacles may not be detected.
• 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.
• The area directly under the bumpers is not detected.
• If obstacles draw too close to the sensor.
• A non-genuine Lexus suspension (lowered suspension etc.) is installed.
• People may not be detected if they are wearing certain types of clothing.
In addition to the examples above, there are instances in which, because of
their shape, signs and other objects may be judged by the sensor to be closer
than they are.

2954-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
The shape of the obstacle may prevent the sensor from detecting it. Pay par-
ticular attention to the following obstacles:
• Wires, fences, ropes, etc.
• Cotton, snow and other materials that absorb sound waves
• Sharply-angled objects
•Low obstacles
• Tall obstacles with upper sections projecting outwards in the direction of
your vehicle
The following situations may occur during use.
• Depending on the shape of the obstacle and other factors, the detection
distance may shorten, or detection may be impossible.
• Obstacles may not be detected if they are too close to the sensor.
• There will be a short delay between obstacle detection and display. Even
at slow speeds, there is a possibility that the obstacle will come within
the sensor’s detection areas before the display is shown and the warning
beep sounds.
• Thin posts or objects lower than the sensor may not be detected for colli-
sion when approached, even if they have been detected once.
• It might be difficult to hear beeps due to the volume of audio system or
air flow noise of air conditioning system.
If a message is displayed on the multi-information display
P. 760, 766

2964-5. Using the driving support
GS350/250_EE (OM30C36E)
CAUTION
When using the Lexus parking assist-sensor
Observe the following precautions.
Failing to do so may result in the vehicle being unable to be driven safely
and possibly cause an accident.
Do not use the sensor at speeds in excess of 10 km/h (6 mph).
The sensors’ detection areas and reaction times are limited. When moving
forward or reversing, check the areas surrounding the vehicle (especially
the sides of the vehicle) for safety, and drive slowly, using the brake to
control the vehicle’s speed.
Do not install accessories within the sensors’ detection areas.
NOTICE
When using Lexus parking assist-sensor
In the following situations, the system may not function correctly due to a
sensor malfunction etc. Have the vehicle checked by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
The Lexus parking assist-sensor operation display flashes, and a beep
sounds when no obstacles are detected.
If the area around a sensor collides with something, or is subjected to
strong impact.
If the bumper collides with something.
If the display shows continuously without a beep.
If a display error occurs, first check the sensor.
If the error occurs even if there is no ice, snow or mud on the sensor, it is
likely that the sensor is malfunctioning.
Notes when washing the vehicle
Do not apply intensive bursts of water or steam to the sensor area.
Doing so may result in the sensor malfunctioning.

2984-5. Using the driving support
GS350/250_EE (OM30C36E)
Screen display
The parking assist monitor screen will be displayed if the shift
lever is shifted to R while the engine switch is in IGNITION ON
mode.
The parking assist monitor displays the last-used parking mode first.
Display mode switch screen button
Switches the display mode. (P. 299)
Lexus parking assist-sensor display*
If an obstacle is detected while the Lexus parking assist-sensor is on, a
display is shown in the top right corner of the screen.
*: Except for 12.3-inch display
Parking mode switch screen button
Switches the parking mode (between perpendicular parking and parallel
parking assist screens)
Narrow mode screen on-off button
Switch the narrow mode on and off. (P. 313)
Using the Lexus parking assist monitor
Perpendicular parkingParallel parking
1
2
3
4

3124-5. Using the driving support
GS350/250_EE (OM30C36E)Leaving the vehicle stopped, turn the steering wheel all the
way to the left.
Be sure to turn the steering wheel only when the vehicle is stopped.
When the screen changes, keep the steering wheel in its cur-
rent position and back up.
When backing up, be careful not to hit any obstacles with the right front
corner of your vehicle. Back the vehicle up slowly.
When the vehicle is parallel with the road or the shoulder,
straighten the steering wheel.
Check your surroundings visually and with the mirrors, then
back up using the distance guide lines as a reference, and stop.
When the vehicle is approximately in the desired parking location, the
parallel parking assist is complete.

Parallel parking assist mode information
• There is a possibility that parallel parking guidance may not be
given when backing up at a very slow speed.
• If the trunk is opened, the parallel parking assist will be inter-
rupted by a message being displayed on the screen. Stop the
vehicle, shift the shift lever out of the R position, and restart
the operation from the step .
Canceling parallel parking assist
Select .

Vehicles with Lexus parking assist-sensor
If Lexus parking assist-sensor detects an object while you
attempt to park in a parking space on the left, the black and yel-
low vertical pole could be obscured by Lexus parking assist-sen-
sor display. In this event, turn Lexus parking assist-sensor switch
off (P. 285), and operate the vehicle while checking the safety
of the surrounding area direct visually and with mirror. After the
operation, turn the switch on.
8
9
10
1

3224-5. Using the driving support
GS350/250_EE (OM30C36E)
The image is blurry
Dirt or foreign matter
(such as water droplets,
snow, mud etc.) is
adhering to the camera.Rinse the camera lens
with water and wipe it
clean with a soft cloth.
Wash with a mild soap
if the dirt is stubborn.
The image is out of
alignment
The camera or sur-
rounding area has
received a strong
impact.
Have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
The guide lines are
very far out of align-
mentThe camera position is
out of alignment.
Have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
The estimated course
lines move even
though the steering
wheel is straightThere is a malfunction
in the signals being
output by the steering
sensor.
Have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
SymptomLikely causeSolution

3234-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
Guide lines are not dis-
playedThe trunk lid is open.
Close the trunk lid.
If this does not resolve
the symptom, have the
vehicle inspected by
any authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
“System is initializ-
ing.” is displayed
• The battery has been
reinstalled.
• The steering wheel
has been moved
while the battery was
being reinstalled.
• Battery power is low.
• The steering sensor
has been reinstalled.
• There is a malfunc-
tion in the signals
being output by the
steering sensor.
Stop the vehicle, and
turn the steering wheel
as far as it will go to
the left and right.
If this does not resolve
the symptom, have the
vehicle inspected by
any authorized Lexus
dealer or repairer, or
another duly qualified
and equipped profes-
sional.
• On the system initial-
ization screen, select
the “?” button to dis-
play the operating
procedure.
SymptomLikely causeSolution

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)

3474-5. Using the driving support
4
Driving
GS350/250_EE (OM30C36E)
Pre-crash alert braking:
• The system determines that the driver is not facing forward, or that the
driver’s eyes are closed.
• Vehicle speed is greater than about 40 km/h (25 mph).
• The speed at which your vehicle is approaching the vehicle running
ahead of you is greater than about 40 km/h (25 mph).
• The steering is not being turned.
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 climbing a steep hill causes an overhead billboard or other metallic
structure to appear directly in the vehicle’s line of travel
When the system is activated in the situations described above, there is also a
possibility 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 it.
Obstacles not detected
The sensor cannot detect plastic obstacles such as traffic cones. There may
also be occasions when the sensor cannot detect pedestrians, animals, bicy-
cles, motorcycles, trees, or snowdrifts.