brake LEXUS LS500 2018 Workshop Manual

250 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ■
Warning messages and buzzers for
dynamic radar cruise control with
full-speed range
Warning messages and buzzers are used to
indicate a system malfunction or to inform
the driver of the need for caution while driv-
ing. If a warning message is shown on the
multi-information display, read the message
and follow the instructions. ■
When the sensor may not be correctly
detecting the vehicle ahead
In the case of the following and depending
on the conditions, operate the brake pedal
when deceleration of the system is insuffi-
cient or operate the accelerator pedal
when acceleration is required.
As the sensor may not be able to correctly
detect these types of vehicles, the approach
warning ( → P.247) may not be activated.●
Vehicles that cut in suddenly●
Vehicles traveling at low speeds●
Vehicles that are not moving in the same
lane●
Vehicles with small rear ends (trailers
with no load on board, etc.)
●
Motorcycles travelin g in the same lane●
When water or snow thrown up by the
surrounding vehicles hinders the detect-
ing of the sensor
●
When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.) ●
Preceding vehicle has an extremely high
ground clearance
■
Conditions under which the vehi-
cle-to-vehicle dist ance control mode
may not function correctly
In the case of the following conditions,
operate the brake pedal (or accelerator
pedal, depending on the situation) as nec-
essary.
As the sensor may not be able to correctly
detect vehicles ahead, the system may not
operate properly. ●
When driving around a curve, on a nar-
row road, or on a bridge, in a tunnel, etc.,
where there are objects on the roadside
●
When steering wheel operation or your
position in the lane is unstable
●
When the vehicle ahead of you deceler-
ates suddenly
●
While the vehicle speed is decreasing to
the set speed after the vehicle acceler-
ates by depressing the accelerator pedal.

2594-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving disabled, select on the multi-infor-
mation display, select and then On.
If disabled using this method, the sys-
tem will not be re-enabled by turning
the engine switch off and then to IGNI-
TION ON mode.
■
The system can be operated when
●
The engine switch is in IGNITION ON
mode.
●
Intuitive parking assist function is on.
●
The vehicle speed is less than about 6
mph (10 km/h).WARNING■
When using the intuitive parking
assist
Observe the following precautions.
Failing to do so may result in the vehicle
being unable to be driven safely and pos-
sibly cause an accident. ●
Do not use the sensor at speeds in
excess of 6 mph (10 km/h).●
The sensors’ detection areas and reac-
tion times are limited. When moving
forward or reversing, check the areas
surrounding the vehicle (especially the
sides of the vehicle) for safety, and
drive slowly, using the brake to control
the vehicle’s speed.●
Do not install accessories within the
sensors’ detection areas.●
The area directly under the bumpers is
not detected.
■
When to disable the function
In the following situations, disable the
function as it may operate even though
there is no possibility of a collision. ●
The vehicle is equipped with a fender
pole or wireless antenna.
●
The front or rear bu mper or a sensor
receives a strong impact.
●
A non-genuine Lexus suspension
(lowered suspension, etc.) is installed.
●
Towing eyelets are installed.
●
A backlit licence pl ate is installed. ■
When using intuitive parking assist
In the following situations, the system
may not function correctly due to a sen-
sor malfunction, etc. Have the vehicle
checked by your Lexus dealer. ●
The intuitive parking assist operation
display flashes or shows continuously,
and a buzzer sounds when no objects
are detected. ●
If the area around a sensor collides
with something, or is subjected to
strong impact. ●
If the bumper or grille collides with
something. ●
If the display flashes or is displayed
continuously and a buzzer does not
sound, except when the mute function
has been turned on. ●
If a display error oc curs, first check the
sensor.
If the error occurs even when there is
no ice, snow or mud on the sensor, it is
likely that the sensor is malfunctioning.■
Notes when washing the vehicle
Do not apply intensive bursts of water or
steam to the sensor area.
Doing so may result in the sensor mal-
functioning.
●
When using a high pressure washer to
wash the vehicle, do not spray the sen-
sors directly, as doing so may cause a
sensor to malfunction.
●
When using steam to clean the vehicle,
do not direct steam too close to the
sensors as doing so may cause a sen-
sor to malfunction.

260 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ●
A shift position other than P is selected.■
Setting the buzzer volume
The buzzer volume can be adjusted on the
multi-information display. ( → P.257)■
If “Parking Assist Unavailable Clean
Parking Assist Sensor” is displayed on
the multi-inform ation display
A sensor may be covered with ice, snow,
dirt, etc. Remove the ice, snow, dirt, etc.,
from the sensor to return the system to nor-
mal.
Also, due to ice forming on a sensor at low
temperatures, a warning message may be
displayed or the sensor may not be able to
detect an object. Once the ice melts, the
system will return to normal. ■
Sensor detectio n information●
The following situations may occur
during use.
• Depending on the shape of the object
and other factors, the detection distance
may shorten, or detection may be impos-
sible.
• There will be a short delay between
object detection and display. Even at low
speeds, there is a possibility that the
object will come within the sensor’s
detection areas before the display is
shown and the warning beep sounds.
• It might be difficult to hear the buzzer due
to the volume of the audio system or air
flow noise of the air conditioning system.■
Conditions under which the function
may not function correctly
Certain vehicle conditions and the sur-
rounding environment may affect the ability
of a sensor to correctly detect objects. Par-
ticular instances where this may occur are
listed below.
●
There is dirt, snow or ice on a sensor.
(Cleaning the sensors will resolve this
problem.)
●
A sensor is frozen. (Thawing the area will
resolve this problem.)
In especially cold weather, if a sensor is
frozen the sensor display may be dis-
played abnormally, or objects, such as a
wall, may not be detected.
●
A sensor is covered in any way. ●
When a sensor or the area around a sen-
sor is extremely hot or cold. ●
On an extremely bumpy road, on an
incline, on gravel, or on grass. ●
The vicinity of the vehicle is noisy due to
vehicle horns, motorcycle engines, air
brakes of large vehicles, or other loud
noises producing ultrasonic waves. ●
There is another vehicle equipped with
parking assist sensors in the vicinity. ●
A sensor is coated with a sheet of spray
or heavy rain. ●
If a sensor is hit by a large amount of
water, such as when driving on a flooded
road. ●
If the vehicle is significantly tilted. ●
The vehicle is approaching a tall or
curved curb. ●
If objects draw too close to the sensor. ■
Objects which may not be properly
detected
The shape of the object may prevent the
sensor from detectin g it. Pay particular
attention to the following objects: ●
Wires, fences, ropes, etc. ●
Cotton, snow and other materials that
absorb sound waves ●
Sharply-angled objects ●
Low objects ●
Tall objects with upper sections project-
ing outwards in the direction of your vehi-
cle
People may not be de tected if they are
wearing certain types of clothing.

2714-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving *
:If equipped
■
Parking Support Brake function
(static objects) (if equipped)
Ultrasonic sensors are used to detect
static objects, such as a wall, in the
detection area when driving at a low
speed or backing up. ( → P.277)■
Parking Support Brake function
(rear-crossing vehicles) (if
equipped)
Rear radar sensors are used to detect
approaching vehicles in the detection
area behind the vehicle when backing
up. ( → P.282) ■
Parking Support Brake function
(rear pedestrians) (if equipped)
A rear camera sensor is used to detect
pedestrians in the detection area
behind the vehicle when backing up.
( → P.286)PKSB (Parking Support
Brake) *
The Parking Support Brake system
consists of the following functions
that operate when driving at a low
speed or backing up, such as when
parking. When the system deter-
mines that a collision with a
detected object or pedestrian is
high, a warning operates to urge
the driver to take evasive action. If
the system determines that the pos-
sibility of a collision with a detected
object or pedestrian is extremely
high, the brakes are automatically
applied to help avoid the collision or
help reduce the impact of the colli-
sion.
PKSB (Parking Support Brake)
system WARNING■
Limitations of the Parking Support
Brake system
Do not overly rely on the system, as
doing so may lead to an accident. ●
The driver is solely responsible for safe
driving. Always drive carefully, taking
care to observe your surroundings.
The Parking Support Brake system is
designed to provide support to lessen
the severity of collisions. However, it
may not operate in some situations. ●
The Parking Support Brake system is
not designed to stop the vehicle com-
pletely. Additionally, even if the system
has stopped the vehicl e, it is necessary
to depress the brake pedal immedi-
ately as brake control will be canceled
after approximately 2 seconds.
NOTICE■
If “Parking Support Brake Unavail-
able” is displayed on the multi-infor-
mation display and the PKSB OFF
indicator is flashing
If this message is displayed immediately
after the engine swit ch is changed to
IGNITION ON mode, operate the vehi-
cle carefully, paying attention to your sur-
roundings. It may be necessary to drive
the vehicle for a certain amount of time
before the system returns to normal. (If
the system is not return to normal after
driving for a while, clean the rear camera
lens.)

272 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) The Parking Support Brake can be
enabled/disabled on the multi-informa-
tion display. All of the Parking Support
Brake functions (static objects,
rear-crossing vehicles, and rear pedes-
trians) are enabled/disabled simultane-
ously.
Use the meter control switches to
enable/disable the parking support
brake. ( → P.77)
1 Press or to select .
2 Press or to select
and then press .When the Parking Support Brake is dis-
abled, the PKSB OFF indicator ( → P.64)
illuminates on the multi-information dis-
play.
To re-enable the system when it was dis-
abled, select on the multi-information
display, select and then On. If dis-
abled using this method, the system will not
be re-enabled by turning the engine switch
off and then to IGNITION ON mode.
If the engine output restriction control or
brake control operates, a buzzer will sound
and a message will be displayed on the
Center Display and multi-information dis-
play, to alert the driver. On vehicles with a
head-up display, the head-up display will
display the same message as the
multi-information display.
Depending on the situation, engine output restriction control will operate to either
limit acceleration or restrict output as
much as possible.
 Engine output restriction control is
operating (acceleration restriction) Acceleration greater than a certain
amount is restricted by the system.
Center Display (Panoramic view monitor):
No warning displayed
Multi-information display: “Object
Detected Acceleration Reduced”
PKSB OFF indicator: Not illuminated
Buzzer: Does not sound
 Engine output restriction control is
operating (output restricted as
much as possible) The system has determined that stron-
ger-than-normal brake operation is neces-
sary.
Center Display (Panoramic view monitor):
“BRAKE!”
Multi-information display: “BRAKE!”
PKSB OFF indicator: Not illuminated
Buzzer: Short beep
 Brake control is operating The system determined that emergency
braking is necessary.
Center Display (Panoramic view monitor):
“BRAKE!”
Multi-information display: “BRAKE!”
PKSB OFF indicator: Not illuminated
Buzzer: Short beep
 Vehicle stopped by system opera-
tion The vehicle has been stopped by brake
control operation.
Center Display (Panoramic view monitor): Enabling/Disabling the Parking
Support Brake
Displays and buzzers for engine
output restriction control and
brake control

2734-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving “Press Brake Pedal”
Multi-information display: “Switch to
Brake” (If the accelerator pedal is not
depressed, “Press Brake Pedal” will be dis- played.)
PKSB OFF indicator: Illuminated
Buzzer: Short beep
If the Parking Support Brake determines that a collision with a detected object or
pedestrian is possible, the engine output w ill be restricted to restrain any increase
in the vehicle speed. (Engine output restriction control: Se e figure 2 below.)
Additionally, if the accelerator pedal contin ues to be depressed, the brakes will be
applied automatically to re duce the vehicle speed. (Brake control: See figure 3
below.)
 Figure 1 When the PKSB (Parki ng Support Brake) is disabled
Engine output
Braking force
Time
 Figure 2 When engine output restriction control operatesSystem overview
A
B
C

274 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) Engine output
Braking force
Time
Engine output restriction control begins operating
System determines that po ssibility of collision with detected object is high
Engine output reduced
Example: Multi-infomation display:
“BRAKE!”
 Figure 3 When brake control operates
Engine output
Braking force
Time A
B
C
D
E
F
G
A
B
C

2754-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving Engine output restriction control begins operating
System determines that po ssibility of collision with detected object is high
Engine output reduced
System determines that possibility of col lision with detected object is extremely
high
Brake control begins operating
Brake control strength increased
Example: Multi-infomation display:
“BRAKE!”
Example: Multi-infomation display: “Switch to Brake”■
If the Parking Support Brake has oper-
ated
If the vehicle is stopped due to operation of
the Parking Support Brake, the Parking
Support Brake will be disabled and the
PKSB OFF indicator will illuminate. If the
Parking Support Brake operates unneces-
sarily, brake control can be canceled by
depressing the brake pedal or waiting for
approximately 2 seconds for it to automati-
cally be canceled. Then, the vehicle can be
operated by depressing the accelerator
pedal. ■
Re-enabling the Park ing Support Brake
To re-enable the Parking Support Brake
when it is disabled due to operation of the
Parking Support Brake, either enable the
system again ( → P.272), or turn the engine
switch off and then back to IGNITION ON
mode. Additionally, if the object becomes
no longer in the traveling direction of the
vehicle or if the traveling direction of the
vehicle changes (such as changing from
moving forward to backing up, or from
backing up to moving forward), the system
will be re-enabled automatically.
■
If “Parking Support Brake Unavailable”
is displayed on th e multi-information
display and the PKSB OFF indicator is
flashing
If the vehicle is stopped due to operation of
the Parking Support Brake, the Parking
Support Brake will be disabled and the
PKSB OFF indicator will illuminate. ●
A sensor may be cove red with ice, snow,
dirt, etc. Remove the ice, snow, dirt, etc.,
from the sensor to return the system to
normal.
Also, due to ice forming on a sensor at
low temperatures, a warning message
may be displayed or the sensor may not
be able to detect an object. Once the ice
melts, the system wi ll return to normal.●
If this message is di splayed only when the
R shift position is selected, the rear cam-
era lens may be dirty. Clean the camera
lens. If this message is displayed in any
forward shift position, a sensor on the
front or rear bumper may be dirty. Clean
the sensors and their surrounding area
on the bumpers. ●
If this message continues to be displayed
even after cleaning the sensor, or is dis-
played even though the sensor is clean,
have the vehicle inspected by your Lexus
dealer. ●
Initialization may not have been per-
formed after a battery terminal was dis-
connected and reconnected. Initialize the
system. ( → P.275)
If this message continues to be displayed
even after initializati on, have the vehicle
inspected by your Lexus dealer.
■
If a battery terminal has been discon-
nected and reconnected
The system needs to be initialized. To initial-
ize the system, drive the vehicle straight
ahead for 5 seconds or more at a speed of
approximately 22 mph (35 km/h) or more. D
E
F
G
H
I
J
K

276 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) Additionally, for vehicles with the Parking
Support Brake function, turn the steering
wheel fully to the left and right with the vehi-
cle stopped.

2774-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving *
:If equipped
This function will operate in si tuations such as the following if an object is detected
in the traveling direction of the vehicle. ■
When traveling at a low speed and the brake pedal is not depressed, or is
depressed lateParking Support Brake function (static objects) *
If the sensors detect a static object, such as a wall, in the travelling direction of
the vehicle and the system determines that a collision may occur due to the
vehicle suddenly moving forward due to an accidental accelerator pedal oper-
ation, the vehicle moving the unintended direction due to the wrong shift posi-
tion being selected, or while parking or traveling at low speeds, the system will
operate to lessen the impact with the detected static object and reduce the
resulting damage.
Examples of function operation