brake LEXUS LS500 2019 Workshop Manual

260 4-5. Using the driving support systems
LS500_OM_(U)_1810 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.■
Certification 
For vehicles sold in the U.S.A.

For vehicles sold in Canada

270 4-5. Using the driving support systems
LS500_OM_(U)_1810 *
: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.276)■
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.)

2714-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving 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.81)
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.68)
illuminates.
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):
“Press Brake Pedal”Enabling/Disabling the Parking
Support Brake
Displays and buzzers for engine
output restriction control and
brake control

272 4-5. Using the driving support systems
LS500_OM_(U)_1810 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: See figure 2.)
Additionally, if the accelerator pedal contin ues to be depressed, the brakes will be
applied automatically to redu ce the vehicle speed. (Brake control: See figure 3.)
 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

2734-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving 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-information display:
“BRAKE!”
 Figure 3 When brake control operates
Engine output
Braking force
Time A
B
C
D
E
F
G
A
B
C

274 4-5. Using the driving support systems
LS500_OM_(U)_1810 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-information display:
“BRAKE!”
Example: Multi-information 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. ■
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.274)
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

2754-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving Additionally, for vehicles with the Parking
Support Brake function, turn the steering
wheel fully to the left and right with the vehi-
cle stopped. ■
Re-enabling the Park ing Support Brake
To re-enable the Parking Support Brake
when it has been disabled due to operation
of the Parking Support Brake, either enable
the system again (  P.271), or turn the
engine switch off and then back to IGNI-
TION ON mode.
Additionally, if any of the following condi-
tions are met, the syst em will be re-enabled
automatically and the PKSB OFF indicator
will turn off: ●
The P shift position is selected●
The object is no longer detected in the
traveling direction of the vehicle●
The traveling direction of the vehicle
changes *
*
: Except when the Parking Support Brake
function (rear pedestrians) operated.

276 4-5. Using the driving support systems
LS500_OM_(U)_1810 *
: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 func tion (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

2774-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving ■
When the accelerator peda l is depressed excessively
■
When the vehicle moves in the unintend ed direction due to the wrong shift
position being selected
 P.257
Types of sensors WARNING
■
To ensure the Parking Support Brake
can operate properly
Observe the following precautions
regarding the sensors (  P.257). Failure
to do so may cause a sensor to not oper-
ate properly, and may cause an accident. ●
Do not modify, disassemble or paint
the sensors.
●
Do not replace a sensor with a part
other than a genuine part.
●
Do not subject a sensor or its sur-
rounding area to a strong impact.
●
Do not damage the sensors, and
always keep them clean.

278 4-5. Using the driving support systems
LS500_OM_(U)_1810 ■
The Parking Support Brake function
(static object) will operate when
The function will operate when the PKSB
OFF indicator is not illuminated or flashing
(  P.69, 70) and all of the following condi-
tions are met: ●
Engine output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is 9 mph (15 km/h) or
less.
• There is a static ob ject in the traveling
direction of the vehicle and 6 to 13 ft. (2
to 4 m) away.
• The Parking Support Brake determines
that a stronger-than-normal brake opera-
tion is necessary to avoid a collision. ●
Brake control
• Engine output restriction control is oper-
ating.
• The Parking Support Brake determines
that an immediate brake operation is nec-
essary to avoid a collision.
■
The Parking Support Brake function
(static objects) 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 system determines that the collision WARNING●
If the area around a radar sensor is
subjected to an impact, the system
may not operate properly due to a
sensor malfunction. Have the vehicle
inspected by your Lexus dealer.■
Handling the suspension
Do not modify the suspension, as
changes to the height or inclination of the
vehicle may prevent the sensors from
detecting objects correctly or cause the
system to not operate or operate unnec-
essarily. ■
If the Parking Support Brake function
(static objects) operates unnecessar-
ily, such as at a railroad crossing
In the event that the Parking Support
Brake function (static objects) operates
unnecessarily, such as at a railroad cross-
ing, brake control w ill be canceled after
approximately 2 seconds, allowing you
to proceed forward and leave the area,
brake control can also be canceled by
depressing the brake pedal. Depressing
the accelerator pedal after brake control
is canceled will allow you to proceed for-
ward and leave the area. ■
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.
■
When to disable the Parking Support
Brake
In the following situations, disable the
Parking Support Brake as the system
may operate even though there is no
possibility of a collision. ●
When inspecting the vehicle using a
chassis roller, chassis dynamo or free
roller ●
When loading the vehicle onto a boat,
truck or other transport vessel ●
If the suspension has been modified or
tires of a size othe r than specified are
installed ●
If the front of the vehicle is raised or
lowered due to the carried load ●
When equipment that may obstruct a
sensor is installed, such as a towing
eyelet, bumper protector (an addi-
tional trim strip, etc.), bicycle carrier, or
snow plow ●
When using an automatic car wash