2018 LEXUS LS500 Owners Manual

2014-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ■
Active steering assist
If the system determines that the possi-
bility of a collision with an object, such
as a guardrail, or pedestrian is high,
even though the brakes are applied,
and that the collision may be avoidable
through steering control, the system
will steer the vehicle automatically to
help avoid the collision or help reduce
the impact of the collision. ■
Pre-collision seat belts (front seat
only)
If the system determines that the possi-
bility of a frontal collision is high, the
system will retract the seat belts. Addi-
tionally, the system may retract the seat
belts if the brakes are applied suddenly
or control of the vehicle is lost. ■
Pre-collision seatbacks (front pas-
senger’s seat / power rear seat [if
equipped])
If the system determines that the possi-
bility of a frontal collision is high, it may
move the seatbacks of the front pas-
senger’s seat and power rear seats to
the upright position automatically, if
reclined. If a seat is being ad justed, it may not be
moved by the pre-collision seat function.
■
Suspension control
When the system determines that the
possibility of a frontal collision is high,
the Adaptive Variable Suspension Sys-
tem ( → P.295) will control the damp-
ing force of the shock absorbers to
help maintain an appropriate vehicle
posture. ■
Steering control
When the system determines that the
possibility of a frontal collision is high
and the driver is op erating the steering
wheel, the LDH system ( → P.295) will
control the turning angle of the front
and rear wheels and effort necessary
to turn the steering wheel to help
enhance steering responsiveness. WARNING■
Limitations of the pre-collision system ●
The driver is solely responsible for safe
driving. Always drive safely, taking
care to observe your surroundings.
Do not use the pre-collision system
instead of normal braking operations
under any circumstances. This system
will not prevent collisions or lessen col-
lision damage or injury in every situa-
tion. Do not overly rely on this system.
Failure to do so may lead to an acci-
dent, resulting in death or serious
injury. ●
Although this system is designed to
help avoid a collision or help reduce
the impact of the collision, its effective-
ness may change according to various
conditions, therefore the system may
not always be able to achieve the same
level of performance.
Read the following conditions care-
fully. Do not overly rely on this system
and always drive carefully.
• Conditions under which the system
may operate even if there is no possi-
bility of a collision: → P.205
• Conditions under which the system
may not operate properly: → P.207
●
Do not attempt to test the operation of
the pre-collision system yourself, as the
system may not operate properly, pos-
sibly leading to an accident.

202 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) WARNING■
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 may
prevent the pre-collision braking func-
tion 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.
■
Active steering assist●
The steering wheel may turn automati-
cally when active steering assist is
operating.
●
As active steering assist operation will
be canceled when the system deter-
mines that a collision has been
avoided, operate the steering wheel as
necessary. ●
In the following situations, the system
may determine that th e driver is taking
evasive action. In this case, the active
steering assist may not operate or may
be canceled.
• If the accelerator pedal is being
depressed strongly or the steering
wheel is being operat ed. In this case
the system may determine that the
driver is taking evasive action and the
pre-collision braking may not operate.
• 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.
■
Pre-collision seat belts with comfort
function
If the pre-collision se at belts have oper-
ated and the seat belts are locked in a
retracted position, 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 ca n 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

2034-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ■
Enabling/disabling the pre-colli-
sion system
The pre-collision system can be
enabled/disabled on ( → P.76) 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-
ing light will turn on and a message will
be displayed on the multi-information
display.
If the pre-collision sy stem is disabled,
the pedestrian alert system will also be
disabled. At this time, the FCTA (Front
Cross Traffic Alert) ( → P.218) system
will also be disabled.
■
Enabling/Disabling the pedestrian
alert system
The pedestrian alert can be
enabled/disabled on ( → P.76) of
the multi-information display. At this
time, the FCTA (Front Cross Traffic
Alert) system will also be enabled/dis-
abled.WARNING●
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 situation●
If the vehicle cannot be driven in a sta-
ble manner, such as when the vehicle
has been in an accident 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 puncture repair kit is
used
●
If equipment (snow plow, etc.) that may
obstruct a sensor is temporarily
installed to the vehicle Changing settings of the pre-col-
lision system

204 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ■
Changing the pre-collision warn-
ing timing
The pre-collision warning timing can
be changed on ( → P.76) of the
multi-information display. The warning
timing for the pedestrian and FCTA
(Front Cross Traffic Alert) system will
also be changed. The operation timing setting is retained
when the engine switch is turned off.
1 FarThe warning will begin to operate earlier
than with the default timing.
2 MiddleThis is the default setting.
3 NearThe warning will begin to operate later
than with the default timing.
■
Changing the pedestrian alert tim-
ing
If the pre-collision warning timing is
changed, the pedestrian alert and
FCTA (Front Cross Traffic 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, pedes-
trian/bicyclist, guardrail, etc. or a front side
collision with a vehicle is high. Each function
is operational at th e following speeds:●
Pedestrian alert:
• Vehicle speed is between approximately
20 and 40 mph (30 and 65 km/h) ●
Pre-collision warning:
• Vehicle speed is between approximately
3 and 110 mph (5 and 180 km/h). (For
detecting a pedestrian or bicyclist, vehi-
cle speed is between approximately 3
and 50 mph [5 and 80 km/h] and for
detecting a vehicle approaching from the
front left or right side, vehicle speed is
between approximately 7 and 37 mph
[10 and 60 km/h].)
• The relative speed between your vehicle
and the detected pedestrian, bicyclist or
vehicle ahead is approximately 3 mph (5
km/h) or more. (For detecting a vehicle
approaching from the front left or right
side, the speed of the approaching vehi-
cle is between approximately 10 and 37
mph [15 and 60 km/h].) ●
Pre-collision brake assist:
• Vehicle speed is between approximately
20 and 110 mph (30 and 180 km/h). (For
detecting a pedestrian or bicyclist, vehi-
cle speed is between approximately 20
and 50 mph [30 and 80 km/h] and for
detecting a vehicle approaching from the
front left or right side, vehicle speed is
between approximately 19 and 37 mph
[30 and 60 km/h].)
• The relative speed between your vehicle
and the detected pedestrian, bicyclist or
vehicle ahead is approximately 20 mph
(30 km/h) or more. (For detecting a vehi-
cle approaching from the front left or
right side, the speed of the approaching
vehicle is between approximately 10 and
37 mph [15 and 60 km/h].)
●
Pre-collision braking:
• Vehicle speed is between approximately
3 and 110 mph (5 and 180 km/h). (For
detecting a pedestrian or bicyclist, vehi-
cle speed is between approximately 3

2054-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving and 50 mph [5 and 80 km/h].)
• The relative speed between your vehicle
and the detected pedestrian, bicyclist or
vehicle ahead is approximately 3 mph (5
km/h) or more.●
Active steering assist
• Vehicle speed is be tween approximately
25 and 50 mph (40 and 80 km/h). (For
detecting a pedestrian, vehicle speed is
between approximately 25 and 40 mph
[40 and 65 km/h] and for detecting a
guardrail, vehicle speed is between
approximately 37 and 50 mph [60 and
80 km/h].)
The system may not operate in the following
situations: ●
If a battery terminal has been discon-
nected and reconnected and then the
vehicle has not been driven for a certain
amount of time●
If the shift position is in R●
If VSC is disabled (only the pedestrian
alert and pre-collision warning function
will be operational)●
When there is insufficient safe or unob-
structed space for the vehicle to be
steered into●
When an object is approaching the area
the vehicle is to be steered into■
Pedestrian and bicyc list detection func-
tion
The pre-collision system detects pedestri-
ans and bicyclists based on the size, profile,
and motion of the person. However, a
pedestrian or bicyclist may not be detected
depending on the surrounding brightness
and the motion, posture, and angle of the
person, preventing the system from operat-
ing properly. ( → P.207) ■
Cancelation of pre-collision braking
and active steering assist
If either of the follo wing occur while the
pre-collision braking function is operating, it
will be canceled: ●
The accelerator pedal is depressed
strongly. ●
The steering wheel is turned sharply or
abruptly. ■
Conditions under which the system may
operate even if there is no possibility of a
collision ●
In some situations su ch as the following,
the system may determine that there is a
possibility of a frontal collision and oper-
ate.
• When passing a vehicle, pedestrian or
bicyclist
• When changing lanes while overtaking a
preceding vehicle
• When overtaking a preceding vehicle
that is changing lanes
• When overtaking a preceding vehicle
that is making a left/right turn
• When passing a vehicle in an oncoming
lane that is stopped to make a right/left
turn

206 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) • When driving on a road where relative
location to vehicle ahead in an adjacent
lane may change, such as on a winding
road
• When rapidly closing on a vehicle ahead
• When the road surface is uneven or
undulating
• If the front of the vehicle is raised or low-
ered
• When approaching ob jects on the road-
side, such as guardrails, traffic signs, util-
ity poles, street light s, trees, walls, etc.
• When there is a vehicle, pedestrian, bicy-
clist, or object by the roadside at the
entrance of a curve
• When driving on a narrow path sur-
rounded by a structure, such as in a tun-
nel or on an iron bridge
• When there is a metal object (manhole
cover, steel plate, etc.), steps, dips, or a
protrusion on the ro ad surface or road-
side
• When a crossing pedestrian or bicyclist
approaches very close to the vehicle • When passing through a place with a low
structure above the road such as a low
ceiling, underpass, bridge girder, traffic
sign, etc.
• When passing under an object (billboard,
etc.) at the top of an uphill road
• When rapidly closing on an electric toll
gate barrier, parking area barrier, or
other barrier that opens and closes
• When using an automatic car wash
• When driving through or under objects
that may contact the vehicle, such as thick
grass, tree branches, or a banner
• When the vehicle is hit by water, snow,
dust, etc. from a vehicle ahead
• When driving through steam or smoke
• When there are patterns or paint on the
road, a wall, or billboard that may be mis-
taken for a vehicle, pedestrian, or bicy-
clist
• When driving near an object that reflects
radio waves, such as a large truck or
guardrail

2074-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving • When driving near a TV tower, broad-
casting station, electric power plant, or
other location where strong radio waves
or electrical noise may be present
• When passing an oncoming vehicle on a
narrow road
• When driving close to objects such as
walls or poles on a median
• When passing an oncoming vehicle
around a sharp curve
• When passing a vehicle which is making
a left/right turn
• When being passed by a vehicle
approaching from the le ft or right side in
front of your vehicle
• When making a left/right turn while a
vehicle is approaching from the left or
right side in front of your vehicle • When passing an object on the side of the
road, such as a parked vehicle
• When passing an oncoming vehicle on a
S curve
• When there is an obje ct that may be mis-
taken for a pedestrian, such as a utility
pole, tree, or pole on the roadside or at
the entrance of a curve
• When there is a bicycle or motorcycle on
the roadside at the entrance of a curve
• If the preceding vehicle is a bicycle or
motorcycle ●
The system may operate the pedestrian
alert unnecessarily if it detects the follow-
ing:
• Pedestrians on a sidewalk
• Bicycles and motorcycles
• Patterns or paint on the road, a wall,
median, billboard, etc. that may be mis-
taken for a pedestrian or bicyclist ■
Situations in which the system may not
operate properly ●
In some situations, such as the following,
a vehicle or other object may not be
detected by the sensors, preventing the
system from operating properly:
• If an oncoming vehicle is approaching
your vehicle
• 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 preceding vehicle has a low rear end,
such as a low bed trailer
• If a vehicle ahead is carrying a load which
protrudes past its rear bumper
• If a vehicle ahead has extremely high
ground clearance

208 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) • If a vehicle ahead is irregularly shaped,
such as a tractor or side car
• If the sun or other light is shining directly
on a vehicle or guardrail ahead
• If a vehicle cuts in front of your vehicle or
emerges from beside a vehicle
• If a vehicle ahead makes an abrupt
maneuver (such as sudden swerving,
acceleration or deceleration)
• When suddenly cutting behind a preced-
ing vehicle
• When a vehicle ahead is not directly in
front of your vehicle
• When driving in incl ement weather such
as heavy rain, fog, snow or a sandstorm
• When the vehicle is hit by water, snow,
dust, etc. from a vehicle ahead
• When driving through steam or smoke
• When driving in a place where the sur-
rounding 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 oncoming traffic,
shines directly in to the camera sensor
• When driving in a lo cation where there
are many objects which reflect radar,
such as a tunnel or parking garage
• When driving at night or in a tunnel with
the headlights off
• When the surrounding area is dim, such
as at dawn or dusk, or while at night or in
a tunnel
• After the engine has started the vehicle
has not been driven for a certain amount
of time • While making a left/r ight 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 camera
sensor
• The vehicle is wobbling.
• The vehicle is being driven at extremely
high speeds.
• When driving on a hill
• If a sensor is misaligned
• 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)●
In some situations, such as the following,
the sensors may not detect the lane lines
or a safe space the vehicle can be steered
into, preventing the active steering assist
from operating properly:
• When the white (yellow) lane lines are
difficult to see, such as when they are
faint, diverging/merging, or a shadow is
cast upon them
• When the lane is more wide or narrow
than normal
• When there is a light and dark pattern on
the road surface, such as due to road
repairs
• If the system determines that a collision
can be avoided by only using the brakes