2019 LEXUS RCF sensor

246 4-5. Using the driving support systems
RC F_U The pre-collision system is equipped with a sophisticated computer that will
record certain data, such as:
• Accelerator status
•Brake status
• Vehicle speed
• Operation status of the pre-collision system functions
• Information (such as the distance an d relative speed between your vehicle
and the vehicle ahead or other objects)
• Images from the camera sensor (available only when the pre-collision braking
function or the pre-collision brake assist function was operating)
The pre-collision system does not record co nversations, sounds or images of the
inside of the vehicle. ●
Data usage
Lexus may use the data recorded in this computer to diagnose malfunctions,
conduct research and develo pment, and improve quality.
Lexus will not disclose the recorded data to a third party except:
• With the consent of the vehicle owner or with the consent of the lessee if
the vehicle is leased
• In response to an official request by the police, a court of law or a govern-
ment agency
• For use by Lexus in a lawsuit
• For research purposes where the data is not tied to a specific vehicle or
vehicle owner●
Recorded images can be erased using a specialized device.
The image recording function can be disa bled. However, if the function is dis-
abled, data from when the pre-collision system operates will not be available.Vehicle data recording

2474-5. Using the driving support systems
4
Driving
RC F_U Two types of sensors, located behind the front grille and windsh ield, detect infor-
mation necessary to operate the drive assist systems.
Radar sensor
Camera sensorSensors 1
2
WARNING ■
To avoid malfunction of the radar sensor
Observe the following precautions.
Otherwise, the radar sensor may not operat e properly, possibly leading to an accident
resulting in death or serious injury. ●
Keep the radar sensor and front grille emblem clean at all times.
●
Do not attach accessories, stickers (includi ng transparent sticke rs) or other items to
the radar sensor, front grille emblem or surrounding area. ●
Do not subject the radar sensor or su rrounding area to a strong impact.
If the radar sensor, front grille, or front bumper has been subjected to a strong impact,
have the vehicle inspected by your Lexus dealer. ●
Do not disassemble the radar sensor. ●
Do not modify or paint the radar sensor, front grille emblem or surrounding area. ●
If the radar sensor, front grille, or front bumper needs to be removed and installed, or
replaced, contact your Lexus dealer. Radar sensor
Front grille emblem
If the front of the rada r sensor or the front or
back of the front grille emblem is dirty or
covered with water droplets, snow, etc., clean
it.
Clean the radar sensor and front grille
emblem with a soft cloth so you do not mark
or damage them. 1
2

248 4-5. Using the driving support systems
RC F_U WARNING ■
To avoid malfunction of the camera sensor
Observe the following precautions.
Otherwise, the camera sensor may not oper ate properly, possibly leading to an acci-
dent resulting in deat h or serious injury.●
Keep the windshield clean at all times.
• If the windshield is dirty or covered with an oily film, water droplets, snow, etc.,
clear the windshield.
• If a glass coating agent is applied to the wi ndshield, it will still be necessary to use
the windshield wipers to remove water droplets, etc. from the area of the wind-
shield in front of the camera sensor.
• If the inner side of the windshield where th e camera sensor is installed is dirty, con-
tact your Lexus dealer.
●
If the part of the windshield in front of the camera sensor is fogged up or covered with
condensation or ice, use the windshield de fogger to remove the fog, condensation or
ice. (  P. 338)●
If water droplets cannot be properly removed from the area of the windshield in front
of the camera sensor by th e windshield wipers, replace the wiper insert or wiper
blade.
If the wiper inserts or wiper blades need to be replaced, contact your Lexus dealer.●
Do not attach objects, such as stickers, trans-
parent stickers, and so forth, to the outer side
of the windshield in front of the camera sensor
(shaded area in the illustration).
A: From the top of the windshield to approxi-
mately 0.4 in. (1 cm) below the bottom of the
camera sensor
B: Approximately 7.9 in. (20 cm) (Approxi-
mately 4.0 in. [10 cm] to the right and left
from the center of the camera sensor)

2494-5. Using the driving support systems
4
Driving
RC F_U WARNING ●
Do not attach window tinting to the windshield. ●
Replace the windshield if it is damaged or cracked.
If the windshield needs to be re placed, contact your Lexus dealer.●
Do not get the camera sensor wet. ●
Do not allow bright lights to shine into the camera sensor.●
Do not dirty or damage the camera sensor.
When cleaning the inside of the windshield , do not allow glass cleaner to contact the
lens. Also, do not touch the lens.
If the lens is dirty or damaged, contact your Lexus dealer. ●
Do not subject the camera sensor to a strong impact. ●
Do not change the installation position or direction of the camera sensor or remove it.●
Do not disassemble the camera sensor. ●
Do not modify any components of the vehi cle around the camera sensor (inside rear
view mirror, et c.) or ceiling.●
Do not attach any accessories that may obst ruct the camera sensor to the hood, front
grille or front bumper. Contact your Lexus dealer for details.●
If a surfboard or other long object is to be mounted on the roof, ma ke sure that it will
not obstruct the camera sensor. ●
Do not modify the head lights or other lights.

250 4-5. Using the driving support systems
RC F_UPCS (Pre-Collision System) The pre-collision system uses a radar sensor and camera sensor to detect
vehicles and pedestrians in front of yo ur vehicle. When the system determines
that the possibility of a frontal collision with a vehicle or pedestrian is high, a
warning operates to urge the driver to take evasive action and the potential
brake pressure is increased to help the driver avoid the collision. If the system
determines that the possibility of a fr ontal collision with a vehicle or pedes-
trian is extremely high, the brakes are automatically applied to help avoid the
collision or help reduce the impact of the collision.
The pre-collision system can be disabled/enabled and the warning timing can
be changed. (  P. 254)

2534-5. Using the driving support systems
4
Driving
RC F_U WARNING ■
When to disable the pre-collision system
In the following situations, di sable the system, as it may not operate properly, possibly
leading to an accident resultin g in death or serious injury:●
When the vehicle is being towed ●
When your vehicle is towing another vehicle ●
When transporting the vehicle via truck, bo at, train or similar means of transportation●
When the vehicle is raised on a lift with the engine running and the tires are allowed to
rotate freely ●
When inspecting the vehicle using a drum tester such as a chassis dynamometer or
speedometer tester, or when using an on vehicle wheel balancer ●
When a strong impact is applied to the fron t bumper or front grille, due to an accident
or other reasons ●
If the vehicle cannot be driven in a stable manner, such as when the vehicle has been
in an accident or is malfunctioning ●
When the vehicle is driven in a sporty manner or off-road●
When the tires are not properly inflated ●
When the tires are very worn ●
When tires of a size other than specified are installed ●
When tire chains are installed ●
When a compact spare tire or an emergency tire puncture repair kit is used ●
If equipment (snow plow, etc.) that may obstruct the radar sensor or camera sensor is
temporarily installed to the vehicle

258 4-5. Using the driving support systems
RC F_U ■
Situations in which the system may not operate properly ●
In some situations such as the following, a vehicle may not be detected by the radar
sensor and camera sensor, preventing the system from operating properly:
• If an oncoming vehicle is approaching your vehicle
• If a vehicle ahead is a motorcycle or bicycle
• When approaching the side or front of a vehicle
• If a preceding vehicle has a small rear end, such as an unloaded truck
• If a vehicle ahead is carrying a load which protrudes past its rear bumper
• If a vehicle ahead is irregularly shap ed, such as a tractor or side car
• If the sun or other light is shin ing directly on a vehicle ahead
• If a vehicle cuts in front of your ve hicle or emerges from beside a vehicle
• If a vehicle ahead makes an abrupt maneuver (such as sudden swerving, accelera-
tion or deceleration)
• When suddenly cutting behind a preceding vehicle
• When driving in inclement we ather such as heavy rain, fog, snow or a sandstorm
• When the vehicle is hit by water, sn ow, dust, etc. from a vehicle ahead
• When driving through steam or smoke
• When driving in a place where the surrounding brightness changes suddenly, such
as at the entrance or exit of a tunnel
• When a very bright light, such as the sun or the headlights of on coming traffic, shines
directly into the camera sensor
• When the surrounding area is dim, such as at dawn or dusk, or while at night or in a
tunnel• If a preceding vehicle has a low rear end,
such as a low bed trailer
• If a vehicle ahead has extremely high
ground clearance
• When a vehicle ahead is not directly in front
of your vehicle

2594-5. Using the driving support systems
4
Driving
RC F_U • After the engine has started the vehicle has not been driven for a certain amount of
time
• While making a left/right turn and for a few seconds after making a left/right turn
• While driving on a curve and for a few seconds after driving on a curve
• If your vehicle is skidding
• If the wheels are misaligned
• If a wiper blade is blocking the camera sensor
• The vehicle is wobbling.
• The vehicle is being driven at extremely high speeds.
• When driving on a hill
• If the radar sensor or ca mera sensor is misaligned●
In some situations such as the following, sufficient braking forc e may not be obtained,
preventing the system from performing properly:
• If the braking functions cannot operate to their full extent, such as when the brake
parts are extremely cold, extremely hot, or wet
• If the vehicle is not properly maintained (brakes or tires are excessively worn,
improper tire inflation pressure, etc.)
• When the vehicle is being driven on a gravel road or other slippery surface●
Some pedestrians such as the following may not be detected by the radar sensor and
camera sensor, preventing the system from operating properly:
• Pedestrians shorter than approximately 3.2 ft. (1 m) or taller than approximately 6.5
ft. (2 m)
• Pedestrians wearing oversized clothing (a ra in coat, long skirt, etc.), making their sil-
houette obscure
• Pedestrians who are carrying large baggage, holding an umbrella, etc., hiding part
of their body
• Pedestrians who are bending forward or squatting
• Pedestrians who are pushing a stroller , wheelchair, bicycle or other vehicle
• Groups of pedestrians which are close together
• Pedestrians who are wearing white and look extremely bright
• Pedestrians in the dark, such as at night or while in a tunnel
• Pedestrians whose clothing appears to be nearly the same color or brightness as
their surroundings
• Pedestrians near walls, fences , guardrails, or large objects
• Pedestrians who are on a metal object (manhole cover, steel plate, etc.) on the road
• Pedestrians who are walking fast
• Pedestrians who are changing speed abruptly
• Pedestrians running out from be hind a vehicle or a large object
• Pedestrians who are extremely close to the side of the vehicle (outside rear view
mirror, etc.)• If the front of the vehicle is raised or low-
ered