Lexus ES: Parking Support Brake function (static objects)

If the sensors detect a static object, such as a wall, in the traveling 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 operation, the vehicle moving the unintended direction due to the wrong shift position 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

This function will operate in situations 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 late

■ When the accelerator pedal is depressed excessively

■ When the vehicle moves in the unintended direction due to the wrong shift position being selected

WARNING

■To ensure the Parking Support Brake can operate properly Observe the following precautions regarding the sensors. Failure to do so may cause a sensor to not operate 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 surrounding area to a strong impact.
• Do not damage the sensors, and always keep them clean.

WARNING

■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 unnecessarily.

■If the Parking Support Brake function (static objects) operates unnecessarily, such as at a railroad crossing In the event that the Parking Support Brake function (static objects) operates unnecessarily, such as at a railroad crossing, brake control will 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 forward 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 malfunctioning.

• When using a high pressure washer to wash the vehicle, do not spray the sensors 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 sensor 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 other 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 additional trim strip, etc.), bicycle carrier, or snow plow
• When using an automatic car wash

■The Parking Support Brake function (static object) will operate when

The function will operate when the PKSB OFF indicator is not illuminated or flashing and all of the following conditions are met:

• Hybrid system output restriction control
  • The Parking Support Brake is enabled.
  • The vehicle speed is 9 mph (15 km/h) or less.
  • There is a static object 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 operation is necessary to avoid a collision.
• Brake control
  • Hybrid system output restriction control is operating.
  • The Parking Support Brake determines that an immediate brake operation is necessary 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:

• Hybrid system output restriction control
  • The Parking Support Brake is disabled.
  • The system determines that the collision has become avoidable with normal brake operation.
  • The static object is no longer 6 to 13 ft. (2 to 4 m) away from the vehicle or in the traveling direction of the 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 static object is no longer 6 to 13 ft. (2 to 4 m) away from the vehicle or in the traveling direction of the vehicle.

■Detection range of the Parking Support Brake function (static objects) The detection range of the Parking Support Brake function (static objects) differs from the detection range of the intuitive parking assist. Therefore, even if the intuitive parking assist detects an object and provides a warning, the Parking Support Brake function (static objects) may not start operating.

■Objects that the Parking Support Brake function (static objects) may not detect The sensors may not be able to detect certain objects, such as the following:

• Pedestrian
• Cotton cloth, snow, and other materials that are poor reflectors of ultrasonic waves
• Objects which are not perpendicular to the ground, are not perpendicular to the traveling direction of the vehicle, are uneven or are waving
• Low objects
• Thin objects such as wires, fences, ropes and signposts
• Objects that are extremely close to the bumper
• Sharply-angled objects
• Tall objects with upper sections projecting outwards in the direction of your vehicle

■Situations in which the Parking Support Brake function (static objects) may not operate When driving with the shift lever in N

■Intuitive parking assist buzzer Regardless of whether the intuitive parking assist system is enabled or not, if the Parking Support Brake function (static objects) is enabled, the front or rear sensors detect an object and brake control is performed, the intuitive parking assist buzzer will sound to notify the driver of the approximate distance to the object.

■Situations in which the Parking Support Brake function (static objects) may operate even if there is no possibility of a collision In some situations, such as the following, the Parking Support Brake function (static objects) may operate even though there is no possibility of a collision.

• Vehicle surroundings

• When driving on a narrow road

• When driving on a gravel road or in an area with tall grass

• When driving toward a banner, flag, low-hanging branch or boom barrier (such as those used at railroad crossings, toll gates and parking lots)
• When driving on a narrow path surrounded by a structure, such as in a tunnel or on an iron bridge
• When parallel parking
• When there is a rut or hole in the surface of the road
• When driving on a metal cover (grating), such as those used for drainage ditches
• When driving on a steep slope
• If a sensor is hit by a large amount of water, such as when driving on a flooded road

• 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 inclement weather such as fog, snow or a sandstorm
• When strong winds are blowing

• 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 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 lowered 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 (static 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 sensor 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 inclement weather such as fog, snow or a sandstorm
• A sensor is frozen. (Thawing the area will resolve this problem.)

• 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
• The vehicle is approaching a tall or curved curb.
• On an extremely bumpy road, on an incline, on gravel, or on grass.
• If objects draw too close to the sensor.

• Other ultrasonic waves 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 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 lowered due to the carried load
• If the orientation of a sensor has been changed due to a collision or other impact
• When equipment that may obstruct a sensor is installed, such as a towing eyelet, bumper protector (an additional trim strip, etc.), bicycle carrier, or snow plow
• If the suspension has been modified or tires of a size other than specified are installed
• If a sensor has been painted or covered with a sticker, etc.

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