sensor LEXUS RX450H 2019 Repair Manual

3504-5. Using the driving support systems
RX450h_RX450hL_U
■Re-enabling the Intelligent Clearance Sonar system
To re-enable the Intelligent Clearance Sonar system when it is disabled due to operation
of the Intelligent Clearance Sonar function, either enable the system again ( P. 345), or
turn the power switch off an d then back to ON mode.
Additionally, if the object becomes no longer in the traveling direction of the vehicle or if
the traveling direction of the vehicle change s (such as changing from moving forward to
backing up, or from backing up to moving fo rward), the system will be re-enabled auto-
matically.
■Objects that the Intelligent Clearance Sonar function may not detect
The sensors may not be able to detect certain objects, such as the following.
●Cotton cloth, snow, and other materials that are poor reflectors of ultrasonic waves.
(People may also not be detected depending on the type of clothing they are wearing.)
●Objects which are not perpendicular to the ground, are not perpendicular to the travel-
ing direction of the vehicle, are uneven or are waving.
●Low objects
●Thin objects such as wires, fences, ropes and signposts
●Objects that are extremely close to the bumper
■Intuitive parking assist buzzer
Regardless of whether the in tuitive parking assist system is enabled or not ( P. 332), if
the Intelligent Clearance Sonar system is enabled ( P. 345), the front or rear sensors
detect an object and brake control is performed, the intuitive parking assist buzzer will
sound to notify the driver of the approximate distance to the object.

3514-5. Using the driving support systems
4
Driving
RX450h_RX450hL_U
■Situations in which the Intelligent Clearance Sonar function may operate even if there
is no possibility of a collision
In some situations such as the following, the Intelligent Clearance Sonar function may
operate even though there is no possibility of a collision.
●Vehicle surroundings
• When driving toward a banner, flag, low- hanging branch or boom barrier (such as
those used at railroad crossing s, toll gates and parking lots).
• When driving on a narrow path surrounded by a structure, such as in a tunnel or on
an iron bridge
• When parallel parking
• When there is a rut or hole in the surface of the road
• When driving on a metal cover (grating), such as those used for drainage ditches
• When driving on a steep slope
• If a sensor is hit by a large amount of wa ter, such as when driving on a flooded road
●Weather
• If a sensor is covered with ice, snow, dirt, etc. (when cleared, the system will return to
normal)
• If heavy rain or water strikes a sensor
• When driving in inclemen t weather such as fog, snow or a sandstorm
●Other ultrasonic waves sources
• When vehicle horns, vehicle detectors, motorcycle engines, air brakes of large vehi-
cles, the clearance sonar of other vehicles or other devices which produce ultra-
sonic waves are near the vehicle
• If a sticker or an electronic component, su ch as a backlit license plate (especially flu-
orescent type), fog lights, a fender pole or wireless antenna is installed near a sensor
●Changes in the vehicle posture
• If the vehicle is significantly tilted
• If the front of the vehicle is raised or lowered due to the carried load
• If the orientation of a sens or has been changed due to a collision or other impact
• When driving on a narrow road
• When driving on a gravel road or in an
area with tall grass

3524-5. Using the driving support systems
RX450h_RX450hL_U
■If the Intelligent Clearance Sonar function operates unnecessarily such as at a railroad
crossing
Even in the event that the Intelligent Clearance Sonar function operates unnecessarily,
such as at a railroad crossing, brake cont rol will be canceled after approximately 2 sec-
onds, allowing you to proceed forward and leave the area, Brake control can also be
canceled by depressing the brake pedal. Depressing the accelerator pedal again will
allow you to proceed forward and leave the area.
■Situations in which the Intelligent Cleara nce Sonar Brake function may not operate
properly
In some situations such as the following , this function may not operate properly.
●Weather
• If a sensor is covered with ice, snow, dirt, etc. (when cleared, the system will return to
normal)
• If heavy rain or water strikes a sensor
• When driving in inclemen t weather such as fog, snow or a sandstorm
●Vehicle surroundings
• When an object that cannot be detected is between the vehicle and a detected
object
• If an object such as a vehicle, motorcycle, bicycle or pedestrian cuts in front of the
vehicle or runs out from the side of the vehicle.
●Other ultrasonic waves sources
• When vehicle horns, vehicle detectors, motorcycle engines, air brakes of large vehi- cles, the clearance sonar of other vehicles or other devices which produce ultra-
sonic waves are near the vehicle
• If a sticker or an electronic component, su ch as a backlit license plate (especially flu-
orescent type), fog lights, a fender pole or wireless antenna is installed near a sensor
●Changes in the vehicle posture
• If the vehicle is significantly tilted
• If the front of the vehicle is raised or lowered due to the carried load
• If the orientation of a sens or has been changed due to a collision or other impact
• When a sensor or the area around a sen-
sor is extremely hot or cold
• When strong winds are blowing

3534-5. Using the driving support systems
4
Driving
RX450h_RX450hL_U
■If a 12-volt battery terminal has been disconnected and reconnected
The system needs to be initialized.
To initialize the system, drive the vehicle stra ight ahead for 5 seconds or more at a speed
of approximately 22 mph (35 km/h) or more.
■If “ICS Unavailable” is displayed on the mu lti-information display and the ICS OFF indi-
cator is flashing
●A sensor may be covered with ice, snow, dirt, etc. Remove the ice, snow, dirt, etc., from
the sensor to return the system to normal.
Also, due to ice forming on a sensor at low temperatures, a warning message may be
displayed or the sensor may not be able to detect an object. Once the ice melts, the
system will return to normal.
●If this message continues to be displayed even after cleaning the sensor, or is displayed
even though the sensor is clean, have the vehicle inspected by your Lexus dealer.
●Initialization may not have been performed af ter a 12-volt battery terminal was discon-
nected and reconnected. Initialize the system. (P. 353)
■If “ICS Malfunction Visit Your Dealer” is di splayed on the multi-information display and
the ICS OFF indicator is flashing
The system may be malfunctioning. Have the vehicle inspected by your Lexus dealer.

3544-5. Using the driving support systems
RX450h_RX450hL_U
WARNING
■Limitations of the Intelligent Clearance Sonar system
Do not overly rely on the system, as doing so may lead to an accident.
●The driver is solely responsible for safe driving. Always drive carefully, taking care to
observe your surroundings. The Intelligent Clearance Sonar system is designed to
provide support to lessen the severity of collisions. However, it may not operate in
some situations.
●The Intelligent Clearance Sonar system is not designed to stop the vehicle com-
pletely. Additionally, even if the system has stopped the vehicle, it is necessary to
depress the brake pedal immediately as brak e control will be canceled after approxi-
mately 2 seconds.
■To ensure the Intelligent Clearance Sonar system can operate properly
Observe the following precauti ons regarding the sensors (P. 345). Failure to do so
may cause a sensor to not operate pr operly, and may cause an accident.
●Do not modify, disassemble or paint the sensors.
●Do not replace a sensor with a part other than a genuine part.
●Do not subject a sensor or its surrounding area to a strong impact.
●Do not damage the sensors, and always keep them clean.
Observe the following precaution s regarding the radar sensors (P. 322). Failure to
do so may cause a radar sensor to not op erate properly, and may cause an accident.
●Do not modify, disassemble or paint the sensors.
●Do not replace a radar sensor with a part other than a genuine part.
●Do not subject a radar sensor or its surrounding area to a strong impact.
●Do not damage the radar sensors, and alwa ys keep the radar sensors and their sur-
rounding area on the bumper clean.
■Handling the suspension
Do not modify the suspension, as changes to the height or inclination of the vehicle may
prevent the sensors from detecting objects co rrectly or cause the system to not oper-
ate or operate unnecessarily.

3554-5. Using the driving support systems
4
Driving
RX450h_RX450hL_U
NOTICE
■To prevent the system from malfunctioning
●If the area around a sensor is subjected to an impact, the system may not operate
properly due to the sensor being misaligned. Have the vehicle inspected by your
Lexus dealer.
●When using a high pressure washer to wa sh the vehicle, do not spray the sensors
directly, as doing so may cause a sensor to malfunction.
●When using steam to clean the vehicle, do not direct steam too close to the sensors
as doing so may cause a sensor to malfunction.
■To prevent a radar sensor from malfunctioning
●If the area around a radar sensor is subjected to an impact, the system may not oper-
ate properly due to a sensor malfunction. Have the vehicle inspected by your Lexus
dealer.
●Observe the radar sensor handling precautions. (P. 322)
■To prevent unnecessary operation of the Intelligent Clearance Sonar system
In the following situations, disable the Inte lligent Clearance Sonar system as the system
may operate even though there is no possibility of a collision.
●When inspecting the vehicle using a chassi s roller, chassis dynamo or free roller
●When loading the vehicle onto a boat, truck or other transport vessel
●If the suspension has been modified or tires of a size other than specified are installed
●If the front of the vehicle is raised or lowered due to the carried load
●If towing eyelets are installed

3594-5. Using the driving support systems
4
Driving
RX450h_RX450hL_U
■Re-enabling the Rear Cross Traffic Auto Brake function
To re-enable the Rear Cross Traffic Auto Brake function when it is disabled during opera-
tion of the Rear Cross Traffic Auto Brake function, either enable the system again (P.
345), or turn the power switch off and then back to ON mode.
Additionally, if there is no longer a vehicle ap proaching from the right or left at the rear of
the vehicle, or if the traveling direction of the vehicle changes (such as changing from
moving forward to backing up or from backin g up to moving forward), the system will be
re-enabled automatically.
■Conditions under which the Rear Cross Traffic Auto Brake function will not detect a
vehicle
The Rear Cross Traffic Auto Brake function is not designed to detect the following types
of vehicles and/or objects:
●Vehicles approaching from directly behind
●Vehicles backing up in a parkin g space next to your vehicle
●Guardrails, walls, signs, parked vehi cles and similar stationary objects*
●Small motorcycles, bicycles, pedestrians, etc.*
●Vehicles moving away from your vehicle
●Vehicles approaching from the parking spaces next to your vehicle*
*: Depending on the conditions, detection of a vehicle and/or object may occur.
■RCTA function buzzer
Regardless of whether the RCTA function is enabled or not ( P. 321), if the Rear Cross
Traffic Auto Brake function is enabled and brake control is performed, a buzzer will
sound to notify the driver.
●Vehicles that the sensors cannot detect due
to obstructions
●Vehicles which suddenly accelerate or decel-
erate near your vehicle

3614-5. Using the driving support systems
4
Driving
RX450h_RX450hL_U
■Situations in which the Rear Cross Traffic Auto Brake function may not operate prop-
erly
In some situations such as the following , this function may not operate properly.
●Objects and vehicles which the radar sensors are not designed to detect
• Stationary objects
• Vehicles which are moving away from your vehicle
• Pedestrians, motorcycles, bicycles, etc.*
• Objects which are extremely close to a radar sensor
• Vehicles which are approaching from the right or left at the rear of the vehicle at a
traveling speed of less than approximately 5 mph (8 km/h)
• Vehicles which are approaching from the right or left at the rear of the vehicle at a
traveling speed of more than approximately 15 mph (24 km/h)
*: Depending on conditions, detection of a vehicle and/or object may occur.
●Situations in which the radar sensors may not be able to detect an object
• When a sensor or the area around a sensor is extremely hot or cold
• If the rear bumper is covere d with ice, snow, dirt, etc.
• If heavy rain or water strikes the vehicle
• When the detection area of a radar sensor is obstructed by an adjacent vehicle
• If the vehicle is significantly tilted
• If towing eyelets are installed
• If the suspension has been modified or tires of a size othe r than specified are
installed
• If the front of the vehicle is raised or lowered due to the carried load
• If a sticker or an electronic component, su ch as a backlit license plate (especially flu-
orescent type), fog lights, a fender pole or wireless antenna is installed near a radar
sensor
• If the orientation of a rada r sensor has been changed due to a collision or other
impact or removal and installation
• When multiple vehicles are approaching wi th only a small gap between each vehicle
• When a vehicle is approaching at high speed
●Situations in which the radar sensor may not detect a vehicle
• When a vehicle approaches from the right or left at the rear of the vehicle while you
are turning while backing up
• When turning while backing up
• When backing out of a shallow angle park- ing spot

3624-5. Using the driving support systems
RX450h_RX450hL_U
■Handling the radar sensors
 P. 322
• Vehicles that the sensors cannot detect
due to obstructions
• When backing up on a slope with a sharp change in grade
• When a vehicle turns into the detection area

3764-5. Using the driving support systems
RX450h_RX450hL_U
 The estimated course lines move even though the steering wheel is straight
There is a malfunction in the signals being
output by the steering sensor.Have the vehicle inspected by your Lexus
dealer.
Guide lines are not displayed
The back door is open.
Close the back door.
If this does not resolve the symptom, have
the vehicle inspected by your Lexus
dealer.
The estimated course lines are not displayed
• The steering wheel has been moved
while the 12-volt battery was being
reinstalled.
• 12-volt battery power is low.
• The steering sensor has been rein-
stalled.
• There is a malfunction 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 your Lexus
dealer.
Likely causeSolution