2019 LEXUS LS500H cruise control

2334-5. Using the driving support systems
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4
Driving
■If the PCS warning light illuminates and
a message is displayed on the
multi-information display
The system may be temporarily unavailable
or may be malfunctioning.LTA (Lane Tracing Assist)
When driving on highways and
freeways with white (yellow) lane
lines, this function alerts the driver
when the vehicle might depart from
its lane or course
* and provides
assistance by operating the steer-
ing wheel to keep the vehicle in its
lane or course
*. Furthermore, the
system provides steering assistance
when dynamic radar cruise control
with full-speed range is operating
to keep the vehicle in its lane and
when changing lanes (vehicles with
Lexus Safety System + A).
The LTA system recognizes white
(yellow) lane lines or a course
*
using the front camera. Addition-
ally, it detects preceding and sur-
rounding vehicles (vehicles with
Lexus Safety System + A) using the
front camera and radar.
*: Boundary between asphalt and the side of the road, such as grass, soil, or
a curb

2384-5. Using the driving support systems
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■Lane centering function
This function is linked with dynamic
radar cruise control with full-speed
range and provides the required assis-
tance by operating the steering wheel
to keep the vehicle in its current lane.
When dynamic radar cruise control with
full-speed range is not operating, the lane
centering function does not operate.
In situations where the white (yellow) lane
lines are difficult to see or are not visible,
such as when in a traffic jam, this function
will operate to help follow a preceding
vehicle by monitoring the position of the
preceding vehicle.
If the system detect s that the steering
wheel has not been operated for a fixed
amount of time or the steering wheel is not
being firmly gripped, a warning is displayed
on the multi-information display and the
warning buzzer sounds. Make sure to grip
the steering wheel firmly.
■Lane change assist function (vehi-
cles with Lexus Safety System + A)
This function is linked to the dynamic
radar cruise control with full-speed
range and provides assistance for per-
forming lane changes by operating the
steering wheel when you hold the turn
signal lever partway (lane change posi-
tion).( P.182)
When lane change assist function is
operating, the acceleration and decel-
eration of the vehicle is controlled
while the preceding vehicle and vehi-
cles driven in the lane toward which the
turn signal is oper ated are monitored.
When the lane center ing function is not
operating, the lane change assist function
will not operate.
The lane change assist function should not
be operated when ch anging lanes on a
road that is diverging or merging.

2424-5. Using the driving support systems
LS500h_OM_(U)_1809cle speed is less than approximately 32
mph (50 km/h) when the lane center-
ing function is operating.
*2: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
●Steering assist function
This function operates when all of the fol-
lowing conditions are me t in addition to the
operation conditions for the lane depar-
ture alert function.
•Setting for “Steering Assist” in of the multi-information display is set to “ON”.
( P.90)
• Vehicle is not accelerated or decelerated by a fixed amount or more.
• Steering wheel is not operated with a
steering force level su itable for changing
lanes.
• ABS, VSC, TRAC and PCS are not oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not displayed. ( P.244)
●Vehicle sway warning function
This function operates when all of the fol-
lowing conditions are met.
• Setting for “Sway Warning” in of the multi-information display is set to “ON”.
( P.90)
• Vehicle speed is approximately 32 mph (50 km/h) or more.
• Width of traffic lane is approximately 9.8
ft. (3 m) or more.
• No system malfunctions are detected. ( P.245)
●Lane centering function
This function operates when all of the fol-
lowing conditions are met.
• LTA is turned on.
• Setting for “Steering Assist” and “Lane Center” in of the multi-information
display are set to “ON”. ( P.90)
• This function recognizes white (yellow)
lane lines or the position of a preceding
vehicle (except when the preceding vehi-
cle is small, such as a motorcycle).
• The dynamic radar cruise control with full-speed range is operating in vehi-
cle-to-vehicle distance control mode.
• Width of traffic lane is approximately 10
to 13 ft. (3 to 4 m).
• Turn signal lever is not operated.
• Vehicle is not being driven around a sharp curve.
• No system malfunctions are detected. ( P.245)
• Vehicle does not ac celerate or deceler-
ate by a fixed amount or more.
• Steering wheel is not operated with a
steering force level su itable for changing
lanes.
• ABS, VSC, TRAC and PCS are not oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not displayed. ( P.244)
• The driver has one or both hands on the steering wheel.
• The vehicle is being driven in the center of a lane.
• Steering assist function is not operating.
●Lane change assist fu nction (vehicles with
Lexus Safety System + A)
This function will operate when all of the
following conditions are met:
• The lane centering function is operating.
• “Lane Change Assist” is set to “ON” in of the multi-information dis-
play.( P.90)
• The vehicle speed is between approxi- mately 57 and 85 mph (90 and 140
km/h).
• White (yellow) lane lines are detected by
the system.
• A broken white line is detected between your vehicle and the lane toward which
the turn signal is operated.
• The turn signal lever is held partway (lane change position) for approximately 1 sec-
ond.
• A vehicle is not overtaking your vehicle
or detected in the lane toward which the
turn signal is operated.
• The vehicle is being driven straight or
around a slight curve.
• The vehicle is not a ccelerating or decel-
erating more than a certain amount.
• The steering wheel is not being turned sufficiently to perf orm a lane change.

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Driving
• ABS, VSC, TRAC and PCS are not oper- ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. ( P.244)
• The dynamic radar cruise control with
full-speed range approach warning is not
operating.
• The lane departure alert function is not
operating.
■Temporary cancellation of functions
●When operation conditions are no longer
met, a function may be temporarily can-
celed. However, when the operation con-
ditions are met again, operation of the
function is automa tically restored.
(  P.241)
●If the operation conditions ( P.241) are
no longer met while the lane centering
function is operating, the steering wheel
may vibrate and the buzzer may sound to
indicate that the function has been tem-
porarily canceled. However, if the “Alert”
customization setting is set to ,
the system will notify the driver by vibrat-
ing the steering wheel instead of sound-
ing the buzzer.
●If the operating conditions ( P.241) are
no longer met, the lane change assist
function will be canceled. (vehicles with
Lexus Safety System + A)
If a message urging operation of the steer-
ing wheel is displayed, operate the steering
wheel.
■Steering assist function/lane centering
function
●Depending on the vehicle speed, lane
departure situation, road conditions, etc.,
the driver may not feel the function is
operating or the function may not oper-
ate at all.
●The steering control of the function is
overrided by the driver’s steering wheel
operation.
●When the vehicle speed is approximately
31 mph (50 km/h) or less, the warning
display of the lane ce ntering function will
not operate.
●Do not attempt to test the operation of the steering assist function.
●The steering assist function may operate
when attempting to cut closely in front of
another vehicle while
changing lanes.
■Lane departure alert function
●The warning buzzer may be difficult to
hear due to external noise, audio play-
back, etc. Also, it may be difficult to feel
steering wheel vibrations due to the road
conditions, etc.
●If the edge of the course* is not clear or
straight, the lane departure alert function
may not operate.
●It may not be possible for the system to
determine if there is a danger of a colli-
sion with a vehicle in an adjacent lane.
●Do not attempt to test the operation of
the lane departure alert function.
●This function may operate if, when chang-
ing lanes, your vehicle cuts closely in front
of another vehicle.
*: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
■Lane change assist function (vehicles
with Lexus Safety System + A)
Depending on the vehicle speed, vehicle
condition, road conditions, or conditions of
the area around the vehicle, the lane
change assist function may not operate or it
may be difficult to recognize that it has
operated.
If steering control oper ation is excessive or
insufficient, it can be corrected by the
driver’s operation of the steering wheel.
In situations such as the following, the lane
change assist function may be canceled:
●When the system no longer detects white
(yellow) lane lines
●When the turn signal lever is operated
fully (right/left turn position)
●When the vehicle speed is outside of the
operational range of the function
●When the system detects operation of
the steering wheel, brake or accelerator
pedal by the driver
While the lane change assist function is

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Driving
Depending on the vehicle and road condi-
tions, the warning may not operate.
■Warning message
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 at 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.
■Customization
Function settings can be changed.
(  P.479)
■Meter display
Multi-information display
Set speed
Indicators
Dynamic radar cruise con-
trol with full-speed range
In vehicle-to-vehicle distance con-
trol mode, the ve hicle automati-
cally accelerates, decelerates and
stops to match the speed changes
of the preceding vehicle even if the
accelerator pedal is not depressed.
In constant speed control mode,
the vehicle runs at a fixed speed.
Use the dynamic radar cruise con-
trol with full-speed range on free-
ways and highways.
 Vehicle-to-vehicle distance con-
trol mode ( P.248)
 Constant speed control mode
( P.252)
System Components
A
B
C

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■Operation switchesVehicle-to-vehicle distance switch
“+RES” switch
Cruise control main switch
Cancel switch
“-SET” switch
WARNING
■Before using dynamic radar cruise
control with full-speed range
●Driving safely is the 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 pr ovides 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.253
• Conditions under which the vehi- cle-to-vehicle distance control mode
may not function correctly: P.254
●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
●Even when the system is functioning
normally, the condition of the preced-
ing vehicle as detected by the system
may differ from the condition
observed by the driver. Therefore, the
driver must always remain alert, assess
the danger of each situation and drive
safely. Relying solely on this system or
assuming the system ensures safety
while driving can lead to an accident,
resulting in death or serious injury.
●Switch the dynamic radar cruise con-
trol with full-speed range setting to off,
using the cruise control main switch
when not in use.
■Cautions regarding the driving assist
systems
Observe the following precautions, as
there are limitations to the assistance
provided by the system. Failure to do so
may cause an accident resulting in death
or serious injury.
●Assisting the driver to measure follow-
ing distance
The dynamic radar cruise control with
full-speed range is only intended to help
the driver in determining the following
distance between the driver’s own vehi-
cle and a designated vehicle traveling
ahead. It is not a mechanism that allows
careless or inattentive driving, and it is
not a system that can assist the driver in
low-visibility conditions.
It is still necessary for driver to pay close
attention to the vehicle’s surroundings.
●Assisting the driver to judge proper
following distance
The dynamic radar cruise control with
full-speed range determines whether the
following distance between the driver’s
own vehicle and a designated vehicle
traveling ahead is within a set range. It is
not capable of making any other type of
judgement. Therefore, it is absolutely
necessary for the driver to remain vigi-
lant and to determine whether or not
there is a possibility of danger in any
given situation.

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WARNING
●Assisting the driver to operate the
vehicle
The dynamic radar cruise control with
full-speed range does not include func-
tions which will prevent or avoid colli-
sions with vehicles ahead of your vehicle.
Therefore, if there is ever any possibility
of danger, the driver must take immedi-
ate and direct control of the vehicle and
act appropriately in order to ensure the
safety of all involved.
■Situations unsuitable for dynamic
radar cruise control with full-speed
range
Do not use dynamic radar cruise control
with full-speed range in any of the follow-
ing situations. Doing so may result in
inappropriate speed control and could
cause an accident re sulting in death or
serious injury.
●Roads where there are pedestrians,
cyclists, etc.
●In heavy traffic
●On roads with sharp bends
●On winding roads
●On slippery roads, such as those cov-
ered with rain, ice or snow
●On steep downhills , or where there
are sudden changes between sharp up
and down gradients
Vehicle speed may exceed the set
speed when driving down a steep hill.
●At entrances to freeways and highways
●When weather conditions are bad
enough that they may prevent the sen-
sors from detectin g correctly (fog,
snow, sandstorm, heavy rain, etc.)
●When there is rain, snow, etc. on the
front surface of the radar or front cam-
era
●In traffic conditions that require fre-
quent repeated acceleration and
deceleration
●During emergency towing
●When an approach warning buzzer is
heard often

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Driving
When there are no longer any preceding vehicles driving slower than the set
speed
The system accelerates until the set speed is re ached. The system then returns to constant
speed cruising.
1 Press the cruise control main switch
to activate the cruise control.
Radar cruise control indicator will come on
and a message will be displayed on the
multi-information display. Press the switch
again to deactivate the cruise control.
If the cruise control ma in switch is pressed
and held for 1.5 seconds or more, the sys-
tem turns on in constant speed control
mode. ( P.252)
2 Accelerate or decelerate, with
accelerator pedal operation, to the
desired vehicle speed (at or above
approximately 20 mph [30 km/h])
and press the “-SET” switch to set
the speed.
Cruise control “SET” indicator will come
on.
The vehicle speed at the moment the switch is released becomes the set speed.
To change the set speed, press the
“+RES” or “-SET” switch until the
desired set speed is displayed.
1
Increases the speed (Except when
the vehicle has been stopped by
system control in vehicle-to-vehi-
cle distance control mode)
2 Decreases the speed
Fine adjustment: Press the switch.
Large adjustment: Pr ess and hold the
switch to change the speed, and release
when the desired speed is reached.
In the vehicle-to-vehicle distance con-
trol mode, the set speed will be
Setting the vehicle speed (vehi-
cle-to-vehicle distance control
mode)
Adjusting the set speed