sensor LEXUS LS500 2021 Service Manual

2374-5. Using the driving support systems
4
Driving
or right in front of your vehicle makes a
left/right turn immediately in front of your
vehicle
●When a pedestrian is approaching your
vehicle
●When an oncoming vehicle makes a
left/right turn
●When your vehicle enters an intersection
before a vehicle approaching from the
left or right in front of your vehicle
●When stopped at traffic light and a vehi-
cle approaches from the left or right in
front of your vehicle
●When driving in a lo cation where there
are objects which reflect radar, such as
vehicles, guardrails, walls, traffic signs,
etc.
●When making a left/rig ht turn in front of
an approaching vehicle
●When passing an oncoming vehicle
●When being overtaken by another vehi-
cle
●When driving next to another vehicle or a
pedestrian
●When a vehicle or pedestrian
approaches the side of your vehicle
Some objects, such as the following, may be
detected and cause the FCTA system to
operate:
●Pedestrians
■Situations in which the system may not
operate properly
In some situations, such as the following, a
vehicle may not be detected by a front side
radar sensor, preventing the system from
operating properly:
●If the front end or si de of an approaching
vehicle is small (sports cars, etc.)
●If the front end of an approaching vehicle
is low (low-slung sports cars, etc.)
●If the ground clearance of an approach-
ing vehicle is extremely high
●If the shape of an approaching vehicle is
unusual (tractors, motorcycles with side-
cars, etc.)
●If a vehicle suddenly enters the detection
area on the left or right in front of your
vehicle from a parking lot, etc.
●If an approaching vehicle moves sud-
denly (sudden steering, acceleration,
deceleration, etc.)
●When driving in inclement weather such
as heavy rain, fog, snow or a sandstorm
●After the engine has been started and the
vehicle has not been driven for a certain
amount of time
●When driving on a road with a grade that
changes sharply (sha rp incline/decline)
●When driving around a sharp curve or on
an undulating road
●If a vehicle is approach ing from the left or
right of the front of your vehicle diago-
nally
●When a vehicle is approaching from the
left or right in front of your vehicle from
far away
●When there is an object between your
vehicle and an approaching vehicle
●When driving in a location where there
are objects which reflect radar, such as
guardrails, walls, vehicles, etc.
●When a group of vehicles which are close
together approach
●Immediately after the FCTA system has
been enabled

2504-5. Using the driving support systems
Depending on the vehicle and road condi-
tions, the warning may not operate.
■LTA (Lane Tracing Assist) warning mes-
sages
If the following warning message is dis-
played on the multi-information display and
the LTA indicator illumin ates in orange, fol-
low the appropriate troubleshooting proce-
dure. Also, if a different warning message is
displayed, follow the instructions displayed
on the screen.
●“LTA Malfunction Visit Your Dealer”
The system may not be operating properly.
Have the vehicle inspected by your Lexus
dealer.
●“LTA Unavailable”
The system is temporarily canceled due to
a malfunction in a se nsor other than the
front camera. Turn the LTA system off, wait
for a little while, and then turn the LTA sys-
tem back on.
●“LTA Unavailable at Current Speed”
The function cannot be used as the vehicle
speed exceeds the LTA operation range.
Drive slower.
■Lane change assist function warning
messages
If the following warning message is dis-
played on the multi-information display, fol-
low the appropriate troubleshooting
procedure. Also, if a different warning mes-
sage is displayed, follo w the instructions dis-
played on the screen.
●“Lane Change Assist Malfunction Visit
Your Dealer”
The system may not be operating properly.
Have the vehicle inspected by your Lexus
dealer.
●“Lane Change Assist Unavailable See Owner’s Manual”
The system is temporarily canceled due to
a malfunction in a sensor other than the
front camera. Turn the LTA system off, wait
for a little while, and then turn the LTA sys-
tem back on.
●“Unavailable Activation Condition not
Satisfied See Owner’s Manual”
The function cannot be used as the operat-
ing conditions have not been met.
(  P.246) Operate the turn signal lever
again after all of the operating conditions
are met.
●“Unavailable at Current Speed”
The lane change assist function cannot be
used as the vehicle speed is outside of the
operable range. Operate the turn signal
lever again while drivin g at a vehicle speed
within the operable range. ( P.246)
●“Unavailable Surrounding Vehicle
Detected”
The function cannot be used as a vehicle
was detected in the lane toward which the
turn signal was operated. Operate the turn
signal lever again after checking that there
are no other vehicles nearby.
■Customization
Function settings can be changed. (Cus-
tomizable features: P.476)

2544-5. Using the driving support systems
In vehicle-to-vehicle distance control
mode, the vehicle automatically accel-
erates, decelerates and stops to match
the speed changes of the preceding
vehicle even if the accelerator pedal is
not depressed. In constant speed con-
trol mode, the vehicle runs at a fixed
speed.
Use the dynamic radar cruise control
with full-speed range on freeways and
highways.
Vehicle-to-vehicle distance control
mode ( P.256)
 Constant speed control mode
( P.261)
■Meter display
Multi-information display
Set speed
Indicators
■Operation switchesVehicle-to-vehicle distance switch
“+RES” switch
Cruise control main switch
Cancel switch
“-SET” switchDynamic radar cruise con-
trol with full-speed range
Summary of function
System Components
A
B
C
WARNING
■Before using dynamic radar cruise
control with full-speed range
●Driving safely is th e sole responsibility
of the driver. Do not rely solely on the
system, and drive safely by always pay-
ing careful attention to your surround-
ings.
●The dynamic radar cruise control with
full-speed range provides driving
assistance to reduce the driver’s bur-
den. However, there are limitations to
the assistance provided.
Read the following conditions care-
fully. Do not overly rely on this system
and always drive carefully.
• When the sensor ma y not be correctly
detecting the vehicle ahead:
P.263
• Conditions under which the vehi- cle-to-vehicle distance control mode
may not function correctly:
P.263
●Set the speed appropriately depend-
ing on the speed limit, traffic flow, road
conditions, weather conditions, etc.
The driver is responsible for checking
the set speed.
A
B
C
D
E

2624-5. Using the driving support systems
P.260
■Dynamic radar cruise control with
full-speed range can be set when
●The shift position is in D.
●The desired set spee d can be set when
the vehicle speed is approximately 20
mph (30 km/h) or more.
(However, when the vehicle speed is set
while driving at below approximately 20
mph [30 km/h], the set speed will be set
to approximately 20 mph [30 km/h].)
■Accelerating after setting the vehicle
speed
The vehicle can accelerate by operating the
accelerator pedal. After accelerating, the
set speed resumes. However, during vehi-
cle-to-vehicle distance control mode, the
vehicle speed may decrease below the set
speed in order to maintain the distance to
the preceding vehicle.
■When the vehicle stops while follow-up
cruising
●Pressing the “+RES” switch while the
vehicle ahead stops w ill resume follow-up
cruising if the vehicle ahead starts off
within approximately 3 seconds after the
switch is pressed.
●If the vehicle ahead starts off within 3 sec-
onds after your vehicle stops, follow-up
cruising will be resumed.
■Automatic cancelation of vehi-
cle-to-vehicle distance control mode
Vehicle-to-vehicle dist ance control mode is
automatically canceled in the following situ-
ations.
●VSC is activated.
●TRAC is activated for a period of time.
●When the VSC or TRAC system is
turned off.
●When snow mode is set.
●The sensor cannot detect correctly
because it is covered in some way.
●When the brake control or output restric-
tion control of a driving support system
operates. (For example: Pre-Collision
System, Drive-Start Control)
●The parking brake is operated.
●The vehicle is stopped by system control
on a steep incline.
●The following are detected when the
vehicle has been stopped by system con-
trol:
• The driver is not wearing a seat belt.
• The driver’s door is opened.
• The vehicle has been stopped for about 3 minutes.
If vehicle-to-vehicle distance control mode
is automatically canceled for any reasons
other than the above, there may be a mal-
function in the system. Contact your Lexus
dealer.
■Automatic cancelation of constant
speed control mode
Constant speed control mode is automati-
cally canceled in the following situations:
●Actual vehicle speed is more than
approximately 10 mph (16 km/h) below
the set vehicle speed.
●Actual vehicle speed falls below approxi-
mately 20 mph (30 km/h).
●VSC is activated.
●TRAC is activated for a period of time.
●When the VSC or TRAC system is
turned off.
●When the brake control or output restric-
tion control of a driving support system
operates. (For example: Pre-Collision
System, Drive-Start Control)
●The parking brake is operated.
If constant speed control mode is automati-
cally canceled for any reasons other than
the above, there may be a malfunction in the
system. Contact your Lexus dealer.

2634-5. Using the driving support systems
4
Driving
■Situations in which the curve speed
reduction function may not operate
(vehicles with Lexus Safety System + A)
In situations such as the following, the curve
speed reduction function may not operate:
●When the vehicle is being driven around
a gentle curve
●When the accelerator pedal is being
depressed
●When the vehicle is being driven around
an extremely short curve
■Brake operation
A brake operation sound may be heard and
the brake pedal respon se may change, but
these are not malfunctions.
■Warning messages and buzzers for
dynamic radar cruise control with
full-speed range
Warning messages and buzzers are used to
indicate a system malfunction or to inform
the driver of the need for caution while driv-
ing. If a warning message is shown on the
multi-information display, read the message
and follow the instructions.( P.207, 213,
436)
■When the sensor may not be correctly
detecting the vehicle ahead
In the case of the following and depending
on the conditions, operate the brake pedal
when deceleration of the system is insuffi-
cient or operate the accelerator pedal
when acceleration is required.
As the sensor may not be able to correctly
detect these types of vehicles, the approach
warning ( P.260) may not be activated.
●Vehicles that cut in suddenly
●Vehicles traveling at low speeds
●Vehicles that are not moving in the same
lane
●Vehicles with small rear ends (trailers
with no load on board, etc.)
●Motorcycles traveling in the same lane
●When water or snow thrown up by the
surrounding vehicles hinders the detect-
ing of the sensor
●When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.)
●Preceding vehicle has an extremely high
ground clearance
■Conditions under which the vehi-
cle-to-vehicle dist ance control mode
may not function correctly
In the case of the following conditions,
operate the brake pedal (or accelerator
pedal, depending on the situation) as nec-
essary.
As the sensor may not be able to correctly
detect vehicles ahead, the system may not
operate properly.
●When the road curves or when the lanes
are narrow

2644-5. Using the driving support systems
●When steering wheel operation or your
position in the lane is unstable
●When the vehicle ahead of you deceler-
ates suddenly
●When driving on a road surrounded by a
structure, such as in a tunnel or on a
bridge
●While the vehicle speed is decreasing to
the set speed after the vehicle acceler-
ates by depressing the accelerator pedal
■Situations in which the curve speed
reduction function may not operate
properly (vehicles with Lexus Safety
System + A)
In situations such as the following, the curve
speed reduction function may not operate
properly:
●When the vehicle is being driven around
a curve on an incline/decline
●When the course of the vehicle differs
from the shape of the curve
●When the vehicle speed is excessively
high when entering a curve
●When the steering wheel is suddenly
operated
*: If equipped
Meter control switches
Turning the Blind Spot Monitor on/off.
BSM (Blind Spot Monitor)*
The Blind Spot Monitor is a system
that uses rear side radar sensors
installed on the inner side of the
rear bumper on the left and right
side to assist the driver in confirm-
ing safety when changing lanes.
WARNING
■Cautions regarding the use of the sys-
tem
The driver is solely responsible for safe
driving. Always drive safely, taking care
to observe your surroundings.
The Blind Spot Monitor is a supplemen-
tary function which alerts the driver that a
vehicle is in a blind spot of the outside
rear view mirrors or is approaching rap-
idly from behind into a blind spot. Do not
overly rely on the Blind Spot Monitor. As
the function cannot judge if it is safe to
change lanes, over re liance could lead to
an accident resulting in death or serious
injury.
As the system may not function correctly
under certain conditio ns, the driver’s own
visual confirmation of safety is necessary.
System components
A

2654-5. Using the driving support systems
4
Driving
Outside rear view mirror indicators
When a vehicle is detected in a blind spot
of the outside rear view mirrors or
approaching rapidly from behind into a
blind spot, the outside rear view mirror
indicator on the detected side will illumi-
nate. If the turn signal lever is operated
toward the detected side, the outside rear
view mirror indicator flashes.
■Outside rear view mirror indicator visi-
bility
In strong sunlight, the outside rear view mir- ror indicator may be difficult to see.
■When “Blind Spot Monitor Unavailable”
is shown on the multi-information dis-
play
Ice, snow, mud, etc., may be attached to the
rear bumper around the sensors. ( P.267)
The system should return to normal opera-
tion after removing the ice, snow, mud, etc.
from the rear bumper. Additionally, the sen-
sors may not operate normally when driving
in extremely hot or cold environments.
■Customization
Some functions can be customized.
(  P.476)
■Certification
B

2674-5. Using the driving support systems
4
Driving
WARNING
■Handling the rear side radar sensor
Blind Spot Monitor se nsors are installed
behind the left and right sides of the rear
bumper respectively. Observe the fol-
lowing to ensure the Blind Spot Monitor
can operate correctly.
●Keep the sensors and the surrounding
areas on the rear bumper clean at all
times.
If a sensor or its surrounding area on the
rear bumper is dirty or covered with
snow, the Blind Spot Monitor may not
operate and a warning message
(
P.265) will be displa yed. In this situa-
tion, clear off the dirt or snow and drive
the vehicle with the operation conditions
of the BSM function (
P.269) satisfied
for approximately 10 minutes. If the
warning message does not disappear,
have the vehicle inspected by your Lexus
dealer.
●Do not attach accessories, stickers
(including transparent stickers), alumi-
num tape, etc. to a sensor or its sur-
rounding area on the rear bumper.

2684-5. Using the driving support systems
Use the meter control switches to turn
on/off the function.
1Press or to select .
2 Press or to select and
then press .
When the BSM function is disabled, the
BSM OFF indicator illuminates. (Each time
the engine switch is turned off then
changed to IGNITION ON mode, the
Blind Spot Monitor will be enabled auto-
matically.)
■Vehicles that can be detected by the Blind Spot Monitor
The Blind Spot Monitor uses rear side radar sensors to detect the following vehi-
cles traveling in adjacent lanes and advises the driver of the presence of such vehi-
cles via the indicators on th e outside rear view mirrors.
Vehicles that are traveling in areas that are not visible using the outside rear
view mirrors (the blind spots)
WARNING
●Do not subject a sensor or its sur-
rounding area on the rear bumper to a
strong impact.
If a sensor is moved even slightly off
position, the system may malfunction
and vehicles may not be detected cor-
rectly.
In the following situations, have your
vehicle inspected by your Lexus
dealer.
• A sensor or its surrounding area is subject to a strong impact.
• If the surrounding area of a sensor is scratched or dented, or part of them
has become disconnected.
●Do not disassemb le the sensor.
●Do not modify the sensor or surround-
ing area on the rear bumper.
●If a sensor or the rear bumper needs to
be removed/installed or replaced,
contact your Lexus dealer.
●Do not paint the rear bumper any
color other than an official Lexus color.
Turning the Blind Spot Monitor
on/off
Blind Spot Monitor operation
A

2704-5. Using the driving support systems
lane*
●Vehicles traveling 2 lanes away from your
vehicle*
●Vehicles which are being overtaken rap-
idly by your vehicle*
*
: Depending on the conditions, detection of a vehicle and/or object may occur.
■Conditions under wh ich the Blind Spot
Monitor may not fu nction correctly
●The Blind Spot Monitor may not detect
vehicles correctly in the following situa-
tions:
• When the sensor is misaligned due to a strong impact to the sensor or its sur-
rounding area
• When mud, snow, ice, a sticker, etc. is covering the sensor or surrounding area
on the rear bumper
• When driving on a road surface that is wet with standing water during bad
weather, such as heavy rain, snow, or fog
• When multiple vehicles are approaching with only a small gap between each vehi-
cle
• When the distance between your vehicle and a following vehicle is short
• When there is a significant difference in
speed between your vehicle and the vehi-
cle that enters the detection area
• When the difference in speed between
your vehicle and another vehicle is
changing
• When a vehicle enters a detection area
traveling at about the same speed as your
vehicle
• As your vehicle starts from a stop, a vehi-
cle remains in the detection area
• When driving up an d down consecutive
steep inclines, such as hills, dips in the
road, etc.
• When driving on roads with sharp bends, consecutive curves, or uneven surfaces
• When vehicle lanes are wide, or when driving on the edge of a lane, and the
vehicle in an adjacent lane is far away
from your vehicle
• When an accessory (such as a bicycle carrier) is installed to the rear of the vehi-
cle
• When there is a significant difference in height between your vehicle and the vehicle that enters the detection area
• Immediately after the Blind Spot Monitor is turned on
●Instances of the Blind Spot Monitor
unnecessarily detecting a vehicle and/or
object may increase in the following situ-
ations:
• When the sensor is misaligned due to a
strong impact to the sensor or its sur-
rounding area
• When the distance between your vehicle
and a guardrail, wall, etc. that enters the
detection area is short
• When driving up and down consecutive
steep inclines, such as hills, dips in the
road, etc.
• When vehicle lanes are narrow, or when
driving on the edge of a lane, and a vehi-
cle traveling in a lane other than the adja-
cent lanes enters the detection area
• When driving on roads with sharp bends, consecutive curves, or uneven surfaces
• When the tires are slipping or spinning
• When the distance between your vehicle
and a following vehicle is short
• When an accessory (such as a bicycle
carrier) is installed to the rear of the vehi-
cle