2020 Lexus LC500h lane assist

2004-5. Using the driving support systems
■Vehicle sway warning function
When the vehicle is swaying or
appears as if it may depart from its lane
multiple times, the warning buzzer
sounds and a message is displayed on
the multi-information display to alert
the driver.
■Lane centering function
This function is linked with radar cruise
control and provides the required
assistance by operating the steering
wheel to keep the vehicle in its current
lane.
When radar cruise cont rol is not operating,
the lane centering function does not oper-
ate.
If the system detects 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-informat ion display and the
warning buzzer sounds.

2024-5. Using the driving support systems
LKA indicator
The illumination condition of the indicator
informs the driver of the system operation
status.
Illuminated in white:
LKA system is operating.
Illuminated in green:
Steering wheel assistance of the steering
assist function or lane centering function is
operating.
Flashing in orange:
Lane departure alert function is operating.
Operation display of steering
wheel operation support
Indicates that steering wheel assistance of
the steering assist function or lane center-
ing function is operating.
Lane departure alert function dis-
play
Displayed when the multi-information dis-
play is switched to th e driving assist system
information screen.
Inside of displayed white lines is
white
Indicates that the system is recognizing
white (yellow) lines . When the vehicle
departs from its lane , the white line dis-
played on the side the vehicle departs from
flashes orange.
Inside of displayed white lines is
black
Indicates that the system is not able to rec-
ognize white (yellow) lines or is temporar-
ily canceled.
Indications on multi-information
display
A
B
C

2034-5. Using the driving support systems
4
Driving
■Operation conditions of each function
●Lane departure alert function
This function operates when all of the fol-
lowing conditions are met.
• LKA is turned on.
• Vehicle speed is approximately 32 mph (50 km/h) or more.
• System recognizes white (yellow) lines.
• Width of traffic lane is approximately 9.8
ft. (3 m) or more.
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or
around a gentle curve with a radius of
more than approximately 492 ft. (150 m).
• No system malfunctions are detected. ( P.205)
●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 departure
alert function.
•Setting for “Steering Assist” in of the multi-information display is set to “On”.
( P.84)
• Vehicle is not accelerated or decelerated by a certain 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.
●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.84)
• 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.205)
●Lane centering function
This function operates when all of the fol-
lowing conditions are met. • LKA is turned on.
• Setting for “Steering Assist” and “Lane
Center” in of the multi-information
display are set to “On”. ( P.84)
• System recognizes white (yellow) lines.
• Dynamic radar cruise control with full- speed range is operating.
• Width of traffic lane is approximately 8.2 to 13.5 ft. (2.5 to 4.1 m).
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or
around a gentle curve with a radius of
more than approximately 656 ft. (200
m).
• No system malfunctions are detected. ( P.205)
• Vehicle does not ac celerate or deceler-
ate by a certain 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.
• Steering assist function is not operating.
■Temporary cancellation of functions
When the operation conditions are no lon-
ger met, a function may be temporarily can-
celed. However, when the operation
conditions are met agai n, operation of the
function is automatically restored.
(  P.203)
■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 oper-
ating or the function may not operate at all.
■Lane departure alert function
The warning buzzer may be difficult to hear
due to external noise, audio playback, etc.
■Hands off steering wheel warning
When the system determines that the driver
has removed their hands from the steering
wheel while the steering assist function or
lane centering function is operating, a warn-
ing message urging the driver to hold the
steering wheel and the symbol shown in the
illustration are displayed on the multi-infor-
mation display.

2054-5. Using the driving support systems
4
Driving
during driving (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 lanes or
crossed an intersection.
●Snow tires, etc. are equipped.
■Warning message
If the following warning message is dis-
played on the multi-information display and
the LKA indicator illumi nates in orange, fol-
low the appropriate troubleshooting proce-
dure.
Warning messageDetails/Actions
“Lane Keeping
Assist Malfunction Visit Your Dealer”
The system may not
be operating prop-
erly.
 Have the vehicle
inspected at
your Lexus
dealer.
“Front Camera
Unavailable
Remove Debris On Windshield”
Dirt, rain, conden-
sation, ice, snow,
etc., are present on
the windshield in
front of the camera
sensor.
Turn the LKA
system off,
remove any dirt,
rain, condensa-
tion, ice, snow,
etc., from the
windshield, and
then turn the
LKA system
back on.
“Front Camera
Unavailable”
The operation con-
ditions of the cam-
era sensor
(temperature, etc.)
are not met.
 When the opera-
tion conditions
of the camera
sensor (tem-
perature, etc.)
are met, the LKA
system will
become avail-
able. Turn the
LKA system off,
wait for a little
while, and then
turn the LKA
system back on.
“Lane Keeping
Assist Unavailable”
The LKA system is
temporarily can-
celed due to a mal-
function in a sensor
other than the cam-
era sensor.
 Turn the LKA
system off and
follow the appro-
priate trouble-
shooting
procedures for
the warning
message. After-
ward, drive the
vehicle for a
short time, and
then turn the
LKA system
back on.
Warning messageDetails/Actions

2064-5. Using the driving support systems
If a different warning message is displayed,
follow the instructions displayed on the
screen.
■Customization
The following settings can be changed.
For how to change sett ings, refer to P.395.
■Meter display
Display
Set speed
Indicators
“Lane Keeping
Assist Unavailable Below Approx 32MPH”
The LKA system
cannot be used as
the vehicle speed is
less than approxi-
mately 32 mph (50
km/h).
 Drive the vehicle
at approxi-
mately 32 mph
(50 km/h) or
more.
“Lane Keeping
Assist Unavailable at Current Speed”
The LKA system
cannot be used as
the vehicle speed is
too high.
 Slow down.
FunctionSetting details
Lane departure alert
functionAdjust alert sensitiv- ity
Steering assist func-tionTurn steering wheel
assistance on and off
Vehicle sway warn- ing function
Turn function on and off
Adjust alert sensitiv-ity
Lane centering
functionTurn function on and off
Warning messageDetails/ActionsDynamic 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.209)
 Constant speed control mode
( P.213)
System Components
A
B
C

2234-5. Using the driving support systems
4
Driving
*:If equipped
Multi-information display
Turning the BSM function/RCTA function
on/off.
The RCTA function is available when the
BSM function is on.
Outside rear view mirror indicators
BSM function:
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 will flash.
RCTA function:
When a vehicle approaching from the right
or left at the rear of the vehicle is detected,
both outside rear view mirror indicators
will flash.
BSM indicator/RCTA indicator
When the BSM function/RCTA function is
turned on, the indicator comes on.
Monitor screen display (RCTA
function only)
If a vehicle approaching from the right or
left at the rear of th e vehicle is detected,
the RCTA icon ( P.229) for the detected
side will be displayed on the monitor
screen. This illustration shows an example
of a vehicle approaching from the left at the
rear of the vehicle.
RCTA buzzer (RCTA function only)
If a vehicle approaching from the right or
left at the rear of th e vehicle is detected, a
buzzer will sound. The buzzer also sounds
for approximately 1 second immediately
after the BSM function is operated to turn
the system on.
BSM (Blind Spot Monitor)*
The Blind Spot Monitor uses the
sensors installed behind the rear
bumper. The system is intended to
assist the driver check areas that
are not easily vi sible. The system
has the following 2 functions:
 The BSM (Blind Spot Monitor)
function
Assists the driver in making a deci-
sion when changing lanes
 The RCTA (Rear Cross Traffic
Alert) function
Assists the driver when backing up
These functions use same sensors.
System components
A
B
C
D
E

2384-5. Using the driving support systems
●If only the TRAC system is turned off, the
TRAC will turn on when vehicle speed
increases
If both the TRAC and VSC systems are
turned off, automatic re-enabling will not
occur when vehicle speed increases.
■Secondary Collision Brake operating
conditions
The vehicle speed is approximately 6 mph
(10 km/h) or more and the airbag sensor
detects a collision. (The Secondary Colli-
sion Brake will not operate when the vehicle
speed is below approximately 6 mph [10
km/h].)
■Secondary Collision Brake automatic
cancellation
The Secondary Collision Brake is automati-
cally canceled in the following situations.
●The vehicle speed drops below approxi-
mately 6 mph (10 km/h)
●A certain amount of time elapses during
operation
●The accelerator pedal is depressed a
large amount
■If “Secondary Collision Brake system
Malfunction” is disp layed on the multi-
information display
The system may be malfunctioning. Have
the vehicle inspected at your Lexus dealer.
■Reduced effectiveness of the EPS sys-
tem
The effectiveness of the EPS system is
reduced to prevent the system from over-
heating when there is frequent steering
input over an extended period of time. The
steering wheel may feel heavy as a result.
Should this occur, re frain from excessive
steering input or stop the vehicle and turn
the engine off. The EPS sys-
tem should return to normal within 10 min-
utes.
WARNING
■The ABS does not operate effectively
when
●The limits of tire gripping performance
have been exceeded (such as exces-
sively worn tires on a snow covered
road).
●The vehicle hydroplanes while driving
at high speed on wet or slick roads.
■Stopping distance when the ABS is
operating may exceed that of normal
conditions
The ABS is not designed to shorten the
vehicle’s stopping di stance. Always main-
tain a safe distance from the vehicle in
front of you, especially in the following
situations:
●When driving on dirt, gravel or snow-
covered roads
●When driving over bumps in the road
●When driving over roads with potholes
or uneven surfaces
■TRAC/VSC may not operate effec-
tively when
Directional control and power may not
be achievable while driving on slippery
road surfaces, even if the TRAC/VSC
system is operating.
Drive the vehicle carefully in conditions
where stability and po wer may be lost.
■Hill- start assist control does not
operate effectively when
●Do not overly rely on hill-start assist
control. Hill-start assist control may
not operate effectively on steep
inclines and roads covered with ice.
●Unlike the parking brake, hill-start
assist control is not intended to hold
the vehicle stationary for an extended
period of time. Do not attempt to use
hill-start assist control to hold the vehi-
cle on an incline, as doing so may lead
to an accident.

3417-2. Steps to take in an emergency
7
When trouble arises
■PCS warning light (warning buzzer)
■LKA (Lane-Keeping Assist) indicator*
*: This light illuminates on the multi-information display.
■Slip indicator
Warning lightDetails/Actions
(Flashes or illumi-nates)
Indicates a malfunction in the PCS (P re-Collision System) or that the
system is temporarily unavailable due to the vehicle being extremely
hot/cold, or dirt around a front sensor, etc. (  P.198, 348)
 Follow the instructions displayed on the multi-information display.
(  P.198, 348)
If the PCS (Pre-Collision System) or VSC (Vehicle Stability Control)
system is disabled, the PCS warning light will illuminate.
 P.236
Warning lightDetails/Actions
(orange)
Indicates a malfunction in th e LKA (Lane-Keeping Assist)
 When “Lane Keeping Assist Unavailable” is displayed on the multi-
information display, turn the LK A (Lane-Keeping Assist) system
off, drive the vehicle for a short time, and then turn the LKA (Lane-
Keeping Assist) system back on. ( P.201)
When a message other than above is displayed, follow the instruc-
tions displayed in the message.
Warning lightDetails/Actions
Indicates a malfunction in:
 The VSC (Vehicle Stability Control) system;
 The TRAC (Traction Control) system; or
 The hill-start assist control system
The light will flash when the VSC, TRAC or ABS system is operating.
 Have the vehicle inspected by your Lexus dealer immediately.