2021 LEXUS LS500 engine

2184-5. Using the driving support systems
■Enabling/disabling the pre-colli-
sion system
The pre-collision system can be
enabled/disabled on ( P.82) of
the multi-information display.
The system is automa tically enabled each
time the engine switch is turned to IGNI-
TION ON mode.
If the system is disabled, the PCS warn-
WARNING
• In some situations, while the active steering assist is operating, operation
of the function may be canceled if the
accelerator pedal is depressed
strongly or the steering wheel is turned
and the system determines that the
driver is taking evasive action.
• When the active steering assist is operating, if the stee ring wheel is held
firmly or is operated in the opposite
direction to that which the system is
generating torque, the function may be
canceled.
• If the brake pedal is depressed, the sys- tem may determine that the driver is
taking evasive action and the active
steering assist operation may be
delayed.
■Active Asssit for seat belts
If the Active Assist has operated and the
seat belts are locked in a retracted posi-
tion, immediately stop the vehicle in a
safe place, release and retract the seat
belts to unlock them and then fasten
them again.
Also, if a seat belt can be loosened, it can
be unlocked by slightly retracting it with-
out releasing it.
■When to disable the pre-collision sys-
tem
In the following situations, disable the
system, as it may not operate properly,
possibly leading to an accident resulting
in death or serious injury:
●When the vehicle is being towed
●When your vehicle is towing another
vehicle
●When transporting the vehicle via
truck, boat, 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 dyna-
mometer or speedometer tester, or
when using an on vehicle wheel bal-
ancer
●When a strong impact has been
applied to the front bumper, rear
bumper or front grille, due to an acci-
dent or other reasons
●If the vehicle cannot be driven in a sta-
ble manner, such as when the vehicle
has been in an accid ent or is malfunc-
tioning
●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 speci-
fied are installed
●When tire chains are installed
●When a compact spare tire or an
emergency tire punctu re repair kit is
used
●If equipment (snow plow, etc.) that may
obstruct a radar sensor or the front
camera is temporarily installed to the
vehicle
Changing settings of the pre-col-
lision system

2194-5. Using the driving support systems
4
Driving
ing light will turn on and a message will
be displayed on the multi-information
display.
If the pre-collision system is disabled,
the pedestrian alert system will also be
disabled.
■Enabling/Disabling the pedestrian
alert system
The pedestrian alert can be
enabled/disabled on ( P.82) of
the multi-information display.
■Changing the pre-collision warn-
ing timing
The pre-collision warning timing can
be changed on ( P.82) of the
multi-information display.
The warning timing setting is retained
when the engine switch is turned off. How-
ever, if the pre-collision system is disabled
and re-enabled, the operation timing will
return to the default setting (middle).
1 Early
2 Middle
This is the default setting.
3Late
■Changing the pedestrian alert tim-
ing
If the pre-collision warning timing is
changed, the pedestrian alert timing
will also be changed accordingly.
■Operational conditions
The pre-collision system is enabled and the system determines that the possibility of a frontal
collision with a vehicle, pedestri an/bicyclist, guardrail, etc. or a front side collision with a
vehicle is high. Each function is operational at the following speeds:
●Pedestrian alert
●Pre-collision warning
Detectable objectsVehicle speed
PedestriansApprox. 20 to 40 mph (30 to 65 km/h)

2254-5. Using the driving support systems
4
Driving
sonal mobility vehicle
• If a preceding vehicle has a small rear end, such as an unloaded truck
• If a preceding vehicle has a low rear end, such as a low bed trailer
• If a vehicle ahead has extremely high ground clearance
• If a vehicle ahead is carrying a load which protrudes past its rear bumper
• If a vehicle ahead is irregularly shaped,
such as a tractor or side car
• If a vehicle ahead is a child sized bicycle, a bicycle that is carrying a large load, a
bicycle ridden by more than one person,
or a uniquely shaped bicycle (bicycle with
a child seat, tandem bicycle, etc.)
• If a pedestrian/or the riding height of a bicyclist ahead is shorter than approxi-
mately 3.2 ft. (1 m) or taller than approxi-
mately 6.5 ft. (2 m)
• If a pedestrian/bicyclist is wearing over- sized clothing (a rain coat, long skirt,
etc.), making their silhouette obscure
• If a pedestrian is bending forward or squatting or bicyclist is bending forward
• If a pedestrian/bicyclist is moving fast
• If a pedestrian is pushing a stroller, wheel- chair, bicycle or other vehicle
• When driving in incl ement weather such
as heavy rain, fog, snow or a sandstorm
• When driving through steam or smoke
• When the surrounding area is dim, such as at dawn or dusk, or while at night or in
a tunnel, making a vehicle, pedestrian or
bicyclist appear to be nearly the same color as its surroundings
• When driving in a place where the sur- rounding brightness changes suddenly,
such as at the entrance or exit of a tunnel
• When driving in a location where there are many objects which reflect radar,
such as a tunnel or parking garage
• 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 front of the vehicle is raised or low-
ered
• If the wheels are misaligned
• If a wiper blade is blocking the front cam- era
• The vehicle is being driven at extremely high speeds.
• When driving on a hill
• If the radar sensor or front camera is mis-
aligned
• If the headlights are misaligned
• When approaching a guardrail at a wide
or narrow angle
• When a vehicle approaches your vehicle
from the front left or right side while your
vehicle is entering an intersection with
poor visibility
• When a vehicle approaches your vehicle from the rear left or right side
• When a vehicle approaches the side of
your vehicle at a shallow angle
• When driving on a road with a grade that changes sharply (sha rp incline/decline)
• Pedestrians and bicyclists which are not
illuminated by the head lights at night, in a
tunnel, etc.
• Pedestrians and bicyclists which change
speed or direction abruptly
• Pedestrians and bicyclists which suddenly

2294-5. Using the driving support systems
4
Driving
WARNING
●Do not attempt to test the operation of
the pre-collision system yourself.
Depending on the objects used for
testing (dummies, cardboard objects
imitating detectable objects, etc.), the
system may not operate properly, pos-
sibly leading to an accident.
■Pre-collision braking
●When the pre-collision braking func-
tion is operating, a large amount of
braking force will be applied.
●If the vehicle is stopped by the opera-
tion of the pre-collision braking func-
tion, the pre-collision braking function
operation will be canceled after
approximately 2 seco nds. Depress the
brake pedal as necessary.
●The pre-collision braking function may
not operate if certain operations are
performed by the driver. If the acceler-
ator pedal is being depressed strongly
or the steering wheel is being turned,
the system may determine that the
driver is taking evasive action and pos-
sibly prevent the pre-collision braking
function from operating.
●In some situations, while the pre-colli-
sion braking function is operating,
operation of the function may be can-
celed if the accelerator pedal is
depressed strongly or the steering
wheel is turned and the system deter-
mines that the driver is taking evasive
action.
●If the brake pedal is being depressed,
the system may determine that the
driver is taking evasive action and pos-
sibly delay the operation timing of the
pre-collision braking function.
■When to disable the pre-collision sys-
tem
In the following situations, disable the
system, as it may not operate properly,
possibly leading to an accident resulting
in death or serious injury:
●When the vehicle is being towed
●When your vehicle is towing another
vehicle
●When transporting the vehicle via
truck, boat, 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 dyna-
mometer or speedometer tester, or
when using an on vehicle wheel bal-
ancer
●When a strong impact is applied to the
front bumper or front grille, due to an
accident or other reasons
●If the vehicle cannot be driven in a sta-
ble manner, such as when the vehicle
has been in an accid ent or is malfunc-
tioning
●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 speci-
fied are installed
●When tire chains are installed
●When a compact spare tire or an
emergency tire punctu re repair kit is
used
●If equipment (snow plow, etc.) that may
obstruct the radar sensor or front cam-
era is temporarily installed to the vehi-
cle

2304-5. Using the driving support systems
■Enabling/disabling the pre-colli-
sion system
The pre-collision system can be
enabled/disabled on ( P.82) of
the multi-information display.
The system is automatically enabled each
time the engine switch is turned to IGNI-
TION ON mode.
If the system is disabled, the PCS warn-
ing light will turn on and a message will
be displayed on the multi-information
display.
■Changing the pre-collision warn-
ing timing
The pre-collision warning timing can
be changed on ( P.82) of the
multi-information display.
The warning timing setting is retained
when the engine switch is turned off. How-
ever, if the pre-collision system is disabled
and re-enabled, the operation timing will
return to the default setting (middle).
1 Early
2 Middle
This is the default setting.
3Late
■Operational conditions
The pre-collision system is enabled and the system determines that the possibility of a frontal
collision with a detect ed object is high.
Each function is operational at the following speed
●Pre-collision warning
Changing settings of the pre-col-
lision system
Detectable objectsVehicle speedRelative speed between your
vehicle and object
VehiclesApprox. 7 to 110 mph (10 to
180 km/h)Approx. 7 to 110 mph (10 to
180 km/h)
Bicyclists and pedestriansApprox. 7 to 50 mph (10 to
80 km/h)Approx. 7 to 50 mph (10 to
80 km/h)

2344-5. Using the driving support systems
as heavy rain, fog, snow or a sandstorm
• When driving through steam or smoke
• When the surrounding area is dim, such as at dawn or dusk, or while at night or in
a tunnel, making a detectable object
appear to be nearly the same color as its
surroundings
• When driving in a place where the sur- rounding brightness changes suddenly,
such as at the entrance or exit of a tunnel
• 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 makin g 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 front of the vehicle is raised or low-
ered
• If the wheels are misaligned
• If a wiper blade is blocking the front cam- era
• The vehicle is being driven at extremely high speeds
• When driving on a hill
• If the radar sensor or front camera is mis-
aligned
●In some situations such as the following,
sufficient braking force 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
■If VSC is disabled
●If VSC is disabled ( P.306), the pre-collision brake assist and pre-colli-
sion braking functions are also disabled.
●The PCS warning light will turn on and
“VSC Turned Off Pre-Collision Brake
System Unavailable” will be displayed on
the multi-information display.

2364-5. Using the driving support systems
■Enabling/disabling the FCTA sys-
tem
The FCTA system can be enabled/dis-
abled on ( P.82) of the
multi-information display.
The system is automatically enabled each
time the engine switch is turned to IGNI-
TION ON mode.
■Changing the alert timing
The FCTA (Front Cross Traffic Alert)
timing can be changed on
(  P.82) of the multi-information dis-
play.
The set alert timing is retained when the
engine switch is turned off. However, if the
FCTA system is disabled and re-enabled,
the alert timing will return to the default
setting (middle).
1 Early
2 Middle
This is the default setting.
3Late
■The FCTA function is operational when
The system operates when all of the follow-
ing conditions are met.
●A shift position other than P or R is
selected.
●Vehicle speed is approximately 9 mph
(15 km/h) or lower.
●A vehicle is approaching from the left or
right in front of your vehicle at a speed
between approximately 6 mph (10 km/h)
and 37 mph (60 km/h).
●There are no preceding vehicles ahead of
your vehicle.
●The accelerator peda l is not strongly
depressed.
●The brake pedal is not being strongly
depressed.
■Situations in which the system may
operate even though no vehicles are
approaching
In certain situations, such as the following,
the system may operate even though no
vehicles are approaching:
●When approaching objects on the road-
side, such as guardrails , traffic signs, util-
ity poles, street lig hts, trees, or walls
●When driving near a TV tower, broad-
casting station, electr ic power plant, or
other location where strong radio waves
or electrical noise may be present
●When passing an object on the side of the
road, such as a parked vehicle
●When a vehicle or pedestrian is
approaching from the left or right in front
of your vehicle from far away
●When a vehicle or pedestrian is moving
within a parking spot, etc. next to the lane
your vehicle is driving in
●When a pedestrian or bicyclist is moving
on a sidewalk
●When a vehicle or pedestrian is moving
away from your vehicle
●When a vehicle approaching from the left
or right in front of your vehicle is deceler-
ating or stops
●When a vehicle approaching from the left
Changing settings of the FCTA
system

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