2018 LEXUS LS500 brake light

2814-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ●
Weather
• If a sensor is covered with ice, snow, dirt,
etc. (when cleared, the system will return
to normal)
• If heavy rain or water strikes a sensor
• When driving in incl ement weather such
as fog, snow or a sandstorm●
Other ultrasonic wave sources
• When vehicle horns, vehicle detectors,
motorcycle engines, air brakes of large
vehicles, the clearance sonar of other
vehicles or other devices which produce
ultrasonic waves are near the vehicle
• If a sticker or an el ectronic component,
such as a backlit license plate (especially
fluorescent type), fog lights, fender pole
or wireless antenna is installed near a
sensor●
Changes in the vehicle posture
• If the vehicle is significantly tilted
• If the front of the vehicle is raised or low-
ered due to the carried load
• If the orientation of a sensor has been
changed due to a collision or other
impact■
Situations in which the Parking Support
Brake function (stati c objects) may not
operate properly
In some situations, such as the following, this
function may not operate properly. ●
Weather
• When a sensor or the area around a sen-
sor is extremely hot or cold
• When strong winds are blowing • If a sensor is covered with ice, snow, dirt,
etc. (when cleared, the system will return
to normal)
• If heavy rain or water strikes a sensor
• When driving in incl ement weather such
as fog, snow or a sandstorm ●
Vehicle surroundings
• When an object that cannot be detected
is between the vehicle and a detected
object
• If an object such as a vehicle, motorcycle,
bicycle or pedestrian cuts in front of the
vehicle or runs out from the side of the
vehicle ●
Other ultrasonic waves sources
• When vehicle horns, vehicle detectors,
motorcycle engines, air brakes of large
vehicles, the clearance sonar of other
vehicles or other de vices which produce
ultrasonic waves are near the vehicle
• If a sticker or an electronic component,
such as a backlit license plate (especially
fluorescent type), fog lights, fender pole
or wireless antenna is installed near a
sensor ●
Changes in the vehicle posture
• If the vehicle is significantly tilted
• If the front of the vehicle is raised or low-
ered due to the carried load
• If the orientation of a sensor has been
changed due to a collision or other
impact

2874-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ■
Parking Support Brake function (rear
pedestrians) will operate when
The function will oper ate when the PKSB
OFF indicator is not illuminated or flashing
( → P.65, 66) and all of the following condi-
tions are met: ●
Engine output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is 10 mph (15 km/h) or
less.
• The shift position is in R.
• The rear camera sensor detects a pedes-
trian behind the vehicle while backing up
and the system determines that the possi-
bility of colliding with the detected
pedestrian is high.●
Brake control
• Engine output restriction control is oper-
ating
• The Parking Support Brake determines
that an emergency brake operation is
necessary to avoid a collision with a
pedestrians.■
The Parking Support Brake function
(rear pedestrians) will stop operating
when
The function will stop operating if any of the
following conditions are met:
●
Engine output restriction control
• The Parking Support Brake is disabled.
• The collision becomes avoidable with
normal brake operation.
• The pedestrian is no longer detected
behind your vehicle.
●
Brake control
• The Parking Support Brake is disabled.
• Approximately 2 seconds have elapsed
since the vehicle was stopped by brake control.
• The brake pedal is depressed after the
vehicle is stopped by brake control.
• The pedestrian is no longer detected
behind your vehicle. ■
Detection area of the Parking Support
Brake function (rear pedestrians)
The detection area of the Parking Support
Brake function (rear pedestrians) differs
from the detection area of the RCD func-
tion ( → P.269). Therefore, even if the RCD
function detects a vehicle and provides an
alert, the Parking Support Brake function
(rear-crossing vehicles) may not start oper-
ating. ■
Situations in which the system may not
operate properly ●
Some pedestrians, such as the following,
may not be detected by the Parking Sup-
port Brake function (rear pedestrians),
preventing the function from operating
properly:
• Pedestrians who are bending forward or
squatting
• Pedestrians who are lying down
• Pedestrians who are running
• Pedestrians who suddenly enter the
detection area
• Pedestrians riding a bicycle, skateboard,
or other light vehicle
• Pedestrians wearing oversized clothing
such as a rain coat, long skirt, etc., making
their silhouette obscure
• Pedestrians whose body is partially hid-
den by an object, such as a cart or
umbrella
• Pedestrians which are obscured by dark-
ness, such as at night ●
In some situations, such as the following,
pedestrians may not be detected by the
Parking Support Brake function (rear
pedestrians), preventing the function
from operating properly:
• When backing up in inclement weather
(rain, snow, fog, etc.)
• When the rear camera is obscured (dirt,
snow, ice, etc. are at tached) or scratched
• When a very bright light, such as the sun,
or the headlights of another vehicle,
shines directly into the rear camera
• When backing up in a place where the
surrounding brightness changes sud-WARNING■
If the Parking Support Brake function
(rear pedestrians) operates unneces-
sarily
Depress the brake pedal immediately
after the Parking Support Brake function
(rear pedestrians) operates. (Operation
of the function is canceled by depressing
the brake pedal.)

288 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) denly, such as at the entrance or exit of a
garage or underground parking lot
• When backing up in a dim environment
such as during dusk or in an underground
parking lot●
Even though there are no pedestrians in
the detection area, some objects, such as
the following, may be detected, possibly
causing the Parking Support Brake func-
tion (rear pedestri ans) to operate.
• Three dimensional objects, such as a
pole, traffic cone, fence, or parked vehi-
cle
• Moving objects, such as a car or motor-
cycle
• Objects moving toward your vehicle
when backing up, such as flags or pud-
dles (or airborne matter, such as smoke,
steam, rain, or snow)
• Cobblestone or gravel roads, tram rails,
road repairs, white lines, pedestrian
crossings or fallen leaves on the road
• Metal covers (gratings), such as those
used for drainage ditches
• Objects reflected in a puddle or on a wet
road surface
• The roadside or bumps on the road
•Shadows on the road ●
In some situations, such as the following,
the Parking Support Brake function (rear
pedestrians) may operate even though
there are no pedestrians in the detection
area.
• When backing up toward the roadside or
a bump on the road
• If the vehicle is significantly tilted, such as
when carrying a heavy load
• When backing up toward an
incline/decline
• If the suspension has been modified or
tires of a size other than specified are
installed
• If the rear of the vehicle is raised or low-
ered due to the carried load
• If an electronic component, such as a
backlit license plate or rear fog light, is
installed near the rear camera
• If a bumper protector, such as an addi-
tional trim strip, is installed to the rear
bumper
• If the orientation of the rear camera has
been changed due to a collision or other
impact, or remova l and installation • If a towing eyelet is in stalled to the rear of
the vehicle
• When water is flowing over the rear cam-
era lens
• When the rear camera is obscured (dirt,
snow, ice, etc. are at tached) or scratched
• If there is a flashing light in the detection
area, such as the emergency flashers of
another vehicle

294 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ■
ECB (Electronically Controlled
Brake System) (if equipped)
The electronically controlled system
generates braking force correspond-
ing to the brake operation ■
ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the
brakes are applied suddenly, or if the
brakes are applied while driving on a
slippery road surface ■
Brake assist
Generates an increased level of brak-
ing force after the brake pedal is
depressed when the system detects a
panic stop situation ■
VSC (Vehicle Stability Control)
Helps the driver to control skidding
when swerving sudden ly or turning on
slippery road surfaces. ■
Secondary Collision Brake
When the airbag sensor detects a colli-
sion, the brakes and brake lights are
automatically controlled to reduce the vehicle speed and that helps reduce
the possibility of further damage due to
a secondary collision. ■
TRAC (Traction Control)
Helps to maintain drive power and pre-
vent the drive wheels from spinning
when starting the vehicle or accelerat-
ing on slippery roads ■
Hill-start assist control
Helps to reduce the backward move-
ment of the vehicle when starting on an
uphill ■
VGRS (Variable Gear Ratio Steer-
ing) (if equipped)
Adjusts the front wheel turning angle in
accordance with the vehicle speed and
steering wheel movement ■
DRS (Dynamic Rear Steering) (if
equipped)
Contributes to the turning characteris-
tics and responsiveness of the vehicle
by adjusting the rear wheel angle of the
vehicle in accordance with steering
wheel movement. ■
EPS (Electric Power Steering)
Employs an electric motor to reduce
the amount of effort needed to turn the
steering wheel. ■
Active stabilizer suspension sys-
tem (if equipped)
Reduces sway when cornering accord-
ing to steering wheel movement in
order to maintain a stable vehicle pos-
ture.Driving assist systems To keep driving safety and perfor-
mance, the following systems oper-
ate automatically in response to
various driving situations. Be aware,
however, that these systems are
supplementary and should not be
relied upon too heavily when oper-
ating the vehicle.
Summary of the driving assist
systems

2954-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ■
Adaptive Variable Suspension Sys-
tem (if equipped)
By independently controlling the
damping force of the shock absorbers
for each of the 4 wheels according to
the road and driving conditions, this
system helps riding comfort with supe-
rior vehicle stabilit y, and helps good
vehicle posture.
Also, the damping force changes
depending on the selected driving
mode. ( → P.289)■
LDH (Lexus Dynamic Handling
system) (if equipped)
Provides integrated control of the
VGRS, DRS and EPS. Contributes to
turning characteristics at low speeds,
responsiveness at medium speeds and
safety at high speeds by controlling the
steering angle of the front and rear
wheels in accordance with the steering
wheel operation and vehicle speed. ■
VDIM (Vehicle Dynamics Inte-
grated Management)
Provides integrated control of the
ABS, brake assist, TRAC, VSC,
hill-start assist control, EPS, VGRS (if
equipped), DRS (if equipped), active
stabilizer suspension system (if
equipped) and Adaptive Variable Sus-
pension System (if equipped)
Helps to maintain vehicle stability when
swerving on slippery road surfaces by
controlling the brakes, engine output,
steering assist, and steering ratio ■
When the TRAC/VSC systems are
operating (vehicles without Lexus
Safety System+A)
The slip indicator light will flash while the
TRAC/VSC systems are operating.
■
When the TRAC/VSC/ABS systems are
operating (vehicles with Lexus Safety
System+A)
The slip indicator light will flash while the
TRAC/VSC/ABS systems are operating.
■
Disabling the TRAC system
If the vehicle gets stuck in mud, dirt or snow,
the TRAC system may reduce power from
the engine to the wheels. Pressing the
switch to turn the system off may make it
easier for you to rock the vehicle in order to
free it.
To turn the TRAC system off, quickly press
and release the switch.
The “Traction Co ntrol Turned Off” will be
shown on the multi-information display.
Press the switch ag ain to turn the sys-
tem back on.

296 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ■
Disabling both TRAC and VSC systems
To turn the TRAC and VSC systems off,
press and hold the switch for more
than 3 seconds while the vehicle is stopped.
The VSC OFF indicator light will come on
and the “Traction Cont rol Turned Off” will
be shown on the mult i-information display. *
Press the switch again to turn the sys-
tem back on. *
: On vehicles with PCS (Pre-Collision
System), PCS will also be disabled (only
Pre-Collision warning is available). The
PCS warning light will come on and a
message will be displayed on the
multi-information display. ( → P.210, 217)■
When the message is displayed on the
multi-information display showing that
TRAC has been disabled even if the
switch has not been pressed
TRAC cannot be operated. Contact your
Lexus dealer. ■
Operating conditions of hill-start assist
control
When the following four conditions are met,
the hill-start assist control will operate:
●
The shift position is in a position other
than P or N (when stating off for-
ward/backward on an upward incline)
●
The vehicle is stopped
●
The accelerator pedal is not depressed
●
The parking brake is not engaged
■
Automatic system cancelation of
hill-start assist control
The hill-start assist control will turn off in any
of the following situations: ●
Shift the shift position to P or N ●
The accelerator pedal is depressed ●
The parking brake is engaged ●
2 seconds at maximum elapsed after the
brake pedal is released ■
VGRS is disabled when
VGRS may stop operat ing in the following
situations.
In this event, the steering wheel may move
from its straight forward position, but it will
return when the system restarts. ●
When the steering wheel is operated for
an extended period of time while the
vehicle is stopped or is moving very
slowly (on vehicles with LDH, DRS is dis-
abled together with VGRS) ●
When the steering wheel has been held
fully to the left or right
The center position of the steering wheel
may change when VGRS is disabled. How-
ever, the position will return to normal after
VGRS is reactivated. ■
When the battery is disconnected (vehi-
cles with VGRS)
The steering wheel may move from its
straight forward position, but this will be
corrected automatically when driving. ■
Sounds and vibrations caused by the
ABS, brake assist, VSC, TRAC, hill-start
assist control and VGRS systems ●
A sound may be heard from the engine
compartment when the brake pedal is
depressed repeatedly, when the engine is
started or just after the vehicle begins to
move. This sound does not indicate that a
malfunction has occurred in any of these
systems.
●
Any of the following conditions may
occur when the above systems are oper-
ating. None of these indicates that a mal-
function has occurred.
• Vibrations may be felt through the vehicle
body and steering.
• A motor sound may be heard also after
the vehicle comes to a stop.
• Vehicles without Lexus Safety Sys-
tem+A: The brake pedal may pulsate
slightly after the ABS is activated.

2974-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving • Vehicles without Lexus Safety Sys-
tem+A: The brake pedal may move down
slightly after the ABS is activated.■
ECB operating sound
ECB operating sound may be heard in the
following cases, but it does not indicate that
a malfunction has occurred. ●
Operating sound heard from the engine
compartment when the brake pedal is
operated.●
Motor sound of the brake system heard
from the front part of the vehicle when
the driver’s door is opened.●
Operating sound heard from the engine
compartment when one or two minutes
passed after the stop of the engine.■
EPS, VGRS and DRS operation sound
When the steering wheel is operated, a
motor sound (whirring sound) may be
heard. This does not indicate a malfunction. ■
Automatic reactivation of TRAC and
VSC systems
After turning the TRAC and VSC systems
off, the systems will be automatically
re-enabled in the following situations: ●
When the engine switch is turned off●
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.■
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 system should
return to normal within 10 minutes.
■
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 ■
When “Check VGRS System” or
“CHECK DRS” is displayed on the
multi-information display
The VGRS or DRS may not operate prop-
erly. Have the vehicle inspected by your
Lexus dealer.
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 with tire chains
●
When driving over bumps in the road
●
When driving over roads with potholes
or uneven surfaces

298 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) WARNING■
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
power may be lost. ■
Hill-start assist control does not oper-
ate 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.■
When the TRAC/VSC is activated
(vehicles without Lexus Safety Sys-
tem+A)
The slip indicator light flashes. Always
drive carefully. Re ckless driving may
cause an accident. Exercise particular
care when the indicator light flashes.
■
When the TRAC/ABS/VSC is acti-
vated (vehicles with Lexus Safety Sys-
tem+A)
The slip indicator light flashes. Always
drive carefully. Re ckless driving may
cause an accident. Exercise particular
care when the indicator light flashes.
■
When the TRAC/VSC systems are
turned off
Be especially careful and drive at a speed
appropriate to the road conditions. As
these are the system s to help ensure
vehicle stability and driving force, do not
turn the TRAC/VSC systems off unless
necessary. ■
Secondary Collision Brake
Do not overly rely on the Secondary Col-
lision Brake. This system is designed to
help reduce the possibility of further
damage due to a secondary collision,
however, that effect changes according
to various conditions. Overly relying on
the system may result in death or serious
injury. ■
Replacing tires
Make sure that all ti res are of the speci-
fied size, brand, tread pattern and total
load capacity. In addition, make sure that
the tires are inflated to the recom-
mended tire inflation pressure level.
The ABS, TRAC and VSC systems will
not function correctly if different tires are
installed on the vehicle.
Contact your Lexus dealer for further
information when replacing tires or
wheels. ■
Handling of tires and the suspension
Using tires with any kind of problem or
modifying the suspensi on will affect the
driving assist systems, and may cause a
system to malfunction.