lights LEXUS RX350 2019 Workshop Manual

288 4-5. Using the driving support systems
RX350/RX350L_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

294 4-5. Using the driving support systems
RX350/RX350L_U WARNING ■
Before using LKA system
Do not rely solely upon the LKA system. LKA is not a system which automatically
drives the vehicle or reduces the amount of attention that must be paid to the area in
front of the vehicle. The driver must always assume full responsibility for driving safely
by always paying careful attention to the surrounding conditions and operate the steer-
ing wheel to correct the path of the vehicle. Also, make sure to take adequate breaks
when fatigued, such as from driv ing for a long period of time.
Failure to perform appropriate driving operat ions and pay careful attention may lead to
an accident, resulting in death or serious injury. ■
To avoid operating LKA by mistake
When not using the LKA system, use the LKA switch to turn the system off. ■
Situations unsuitable for LKA
Do not use the LKA system in the following situations.
The system may not operate properly and lead to an accident, resulting in death or
serious injury. ●
A spare tire, tire chains, etc., are equipped. ●
When the tires have been excessively worn, or when the tire inflation pressure is low. ●
Tires which differ by structure, manufacturer, brand or tread pattern are used. ●
Objects or patterns that could be mistaken for white (yellow) lines are present on the
side of the road (guardrails, cu rbs, reflective poles, etc.).●
Vehicle is driven on a snow-covered road. ●
White (yellow) lines are difficult to see due to rain, snow, fog, dust, etc.●
Asphalt repair marks, white (y ellow) line marks, etc., are present due to road repair.●
Vehicle is driven in a temporary lane or restricted lane due to construction work.●
Vehicle is driven on a road surface which is slippery due to rainy weather, fallen snow,
freezing, etc. ●
Vehicle is driven in traffic lanes ot her than on highways and freeways.●
Vehicle is driven in a construction zone. ●
When your vehicle is towing a trailer or during emergency towing ■
Preventing LKA system malfunctions and operations perf ormed by mistake●
Do not modify the headlights or place stickers, etc., on the surface of the lights.●
Do not modify the suspension etc. If the suspension etc. needs to be replaced, con-
tact your Lexus dealer. ●
Do not install or place anything on the hood or grille. Also, do not install a grille guard
(bull bars, kangaroo bar, etc.). ●
If your windshield needs repair s, contact your Lexus dealer.

2994-5. Using the driving support systems
4
Driving
RX350/RX350L_U ■
Conditions in which functions may not operate properly
In the following situations, the camera sensor may not detect white (yellow) lines and var-
ious functions may not operate normally. ●
There are shadows on the road that run parallel with, or cover, the white (yellow) lines. ●
The vehicle is driven in an ar ea without white (yellow) lines, such as in front of a tollgate
or checkpoint, or at an intersection, etc.●
The white (yellow) lines are cracked, “Botts ’ dots”, “Raised pavement marker” or stones
are present. ●
The white (yellow) lines cannot be seen or are difficult to see due to sand, etc. ●
The vehicle is driven on a road surface that is wet due to rain, puddles, etc. ●
The traffic lines are yellow (which may be more difficult to recognize than lines that are
white). ●
The white (yellow) lines cross over a curb, etc. ●
The vehicle is driven on a bright surface, such as concrete. ●
The vehicle is driven on a surface that is bright due to reflected light, etc. ●
The vehicle is driven in an area where the brightness changes suddenly, such as at the
entrances and exits of tunnels, etc.●
Light from the headlights of an oncoming vehicle, the sun, etc., enters the camera.●
The vehicle is driven where the road diverges, merges, etc. ●
The vehicle is driven on a slope. ●
The vehicle is driven on a road which t ilts left or right, or a winding road.●
The vehicle is driven on an unpaved or rough road. ●
The vehicle is driven around a sharp curve. ●
The traffic lane is excessively narrow or wide. ●
The vehicle is extremely tilted due to carry ing heavy luggage or having improper tire
pressure. ●
The distance to the preceding vehicle is extremely short. ●
The vehicle is moving up and down a large am ount due to road conditions during driv-
ing (poor roads or road seams). ●
The headlight lenses are dirty and emit a faint amount of light at night, or the beam axis
has deviated. ●
The vehicle is struck by a crosswind. ●
The vehicle has just changed lane s or crossed an intersection.●
Snow tires, etc., are equipped. ■
If the LKA indicator is illuminated in ambe r and a warning message is displayed on the
multi-information display
 P. 654 ■
Customization
Some functions can be customized. (  P. 97)

3034-5. Using the driving support systems
4
Driving
RX350/RX350L_U This mode employs a radar sensor to detect the presence of vehicles up to
approximately 328 ft. (100 m) ahead, de termines the current vehicle-to-vehicle
following distance, and operates to main tain a suitable following distance from
the vehicle ahead. Note that vehicle-to-vehicle distance will cl ose in when traveling on downhill slopes.
Example of constant speed cruising
When there are no vehicles ahead The vehicle travels at the speed set by the driver. The desired vehicle-to-vehicle dis-
tance can also be set by operating the vehicle-to-vehicle distance switch.
Example of deceleration cruising and follow-up cruising
When a preceding vehicle driving sl ower than the set speed appearsWhen a vehicle is detected running ahead of you, the system automatically deceler-
ates your vehicle. When a greater reduction in vehicle speed is necessary, the system
applies the brakes (the stop lights will come on at this time). Th e system will respond to
changes in the speed of the vehicle ahead in order to maintain the vehicle-to-vehicle
distance set by the driver. Approach warning warns you when the system cannot
decelerate sufficie ntly to prevent your vehicle from closing in on the vehicle ahead.
When the vehicle ahead of you stops, your vehicle will also stop (vehicle is stopped by
system control). After the vehicle ahead starts off, pushing the cruise control lever up
or depressing the accelerator pedal will resume follow-up cruising.
Example of acceleration
When there are no longer any preceding vehicles driving slower than the set
speed The system accelerates until the set speed is reached. The system then returns to con-
stant speed cruising.Driving in vehicle-to-vehicle distance control mode
1
2
3

3454-5. Using the driving support systems
4
Driving
RX350/RX350L_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 Clearanc e 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

346 4-5. Using the driving support systems
RX350/RX350L_U ■
If the Intelligent Clearance Sonar function operates unnecessarily such as at a railroad
crossing
Even in the event that the Intelligent Cleara nce Sonar function operates unnecessarily,
such as at a railroad crossing, brake cont rol will be canceled afte r 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 sensor
is extremely hot or cold
• When strong winds are blowing

3554-5. Using the driving support systems
4
Driving
RX350/RX350L_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

3694-5. Using the driving support systems
4
Driving
RX350/RX350L_U ■
If you notice any symptoms
If you notice any of the following symp toms, refer to the likely cause and the
solution, and re-check.
If the symptom is not resolved by the solution, have the vehicle inspected by
your Lexus dealer.Things you should know Likely cause Solution
 The image is difficult to see
• The vehicle is in a dark area
• The temperature around the lens is
either high or low
• The outside temperature is low
• There are water droplets on the cam-
era
• It is raining or humid
• Foreign matter (mud, etc.) is adhering
to the camera
• There are scratches on the camera
• Sunlight or headlights are shining
directly into the camera
•The vehicle is unde r fluorescent lights,
sodium lights, mercury lights etc. If this happens due to these causes, it
does not indicate a malfunction.
Back up while visually checking the vehi-
cle’s surroundings. (Use the monitor
again once conditions have been
improved.)
The image on the Lexus parking assist
monitor system screen can be adjusted.
(Vehicles with a Lexus Display Audio sys-
tem:  P. 411) (Vehicles with a navigation
system:  “NAVIGATION SYSTEM
OWNER’S MANUAL”.)
 The image is blurry
Dirt or foreign matter (such as water
droplets, snow, mud, etc.) is adhering to
the camera. Flush the camera with a large quantity of
water and wipe the camera lens clean
with a soft and wet cloth.
 The image is out of alignment
The camera or surrounding area has
received a strong impact. Have the vehicle inspected by your Lexus
dealer.
 The guide lines are very far out of alignment
The camera position is out of alignment. Have the vehicle inspected by your Lexus
dealer.
• The vehicle is tilted (there is a heavy
load on the vehicle, tire pressure is low
due to a tire puncture, etc.)
• The vehicle is used on an incline. If this happens due to these causes, it
does not indicate a malfunction.
Back up while visually checking the vehi-
cle’s surroundings.

372 4-5. Using the driving support systems
RX350/RX350L_U NOTICE ■
How to use the camera ●
The parking assist monitor may not oper ate properly in the following cases.
• If the back of the vehicle is hit, the position and mounting angle of the camera may
change.
• As the camera has a water proof construction, do not detach, disassemble or
modify it. This may cause incorrect operation.
• When cleaning the camera lens, flush the camera with a large quantity of water
and wipe it with a soft and wet cloth. Strongly rubbing the camera lens may cause
the camera lens to be scratched and unable to transmit a clear image.
• Do not allow organic solvent, car wax, window cleaner or glass coat to adhere to
the camera. If this happens, wi pe it off as soon as possible.
• If the temperature changes rapidly, such as when hot water is poured on the vehi-
cle in cold weather, the system may not operate normally.
• When washing the vehicle, do not apply intensive bursts of water to the camera or
camera area. Doing so may result in the camera malfunctioning.
• When the camera is used under fluorescen t lights, sodium light or mercury light
etc., the lights and the illuminated areas may appear to flicker. ●
Do not expose the camera to strong impact as this could cause a malfunction.
If this happens, have the vehicle inspected by your Lexus dealer as soon as possible.

384
RX350/RX350L_U 4-6. Driving tips
●
Use fluids that are appropriate to the prevailing outside temperatures.
•Engine oil
• Engine coolant
• Washer fluid ●
Have a service technician inspect the condition of the battery. ●
Have the vehicle fitted with four snow tires or purchase a set of tire chains for
the front tires. Ensure that all tires are of the specified size and the same brand, and that chains
match the size of the tires.
Perform the following according to the driving conditions: ●
Do not try to forcibly open a window or move a wiper that is frozen. Pour
warm water over the frozen area to me lt the ice. Wipe away the water imme-
diately to prevent it from freezing. ●
To ensure proper operation of the c limate control system fan, remove any
snow that has accumulated on the air inlet vents in front of the windshield. ●
Check for and remove any excess ice or snow that may have accumulated on
the exterior lights, vehicle’s roof, chassi s, around the tires or on the brakes.●
Remove any snow or mud from the bottom of your shoes before getting in the
vehicle.Winter driving tips Carry out the necessary preparations an d inspections before driving the vehi-
cle in winter. Always drive the vehicle in a manner appropriate to the prevail-
ing weather conditions.
Pre-winter preparations
Before driving the vehicle