Lexus ES manuals

Lexus ES: System Description

SYSTEM DESCRIPTION

GENERAL

(a) The parking support alert system has a static objects function, rear crossing vehicles function, and rear pedestrians.

  1. Parking Support Alert (static objects) function
    • This system uses ultrasonic sensors to detect any obstacles at the corners and the rear of the vehicle. The system then informs the driver of the distance between the sensors and an obstacle as well as their positions by indicating them on the multi-information display (on the combination meter assembly), multi-display (on the radio and display receiver assembly) and by sounding a buzzer.
      • *: w/ Headup Display System
  2. Parking Support Alert (rear crossing vehicles) function
    • The RCTA function is a function that informs the driver a vehicle is approaching from the left or the right at the rear of the vehicle. The function uses quasi-millimeter wave radar to detect the position and relative speed of other vehicles. When the function determines that a vehicle is approaching this vehicle, this function informs the driver using the outer rear view mirror indicators and blind spot monitor buzzer.
  3. Parking Support Alert (rear pedestrian detection) function
    • When the rear camera detection function of the rear television camera assembly detects a pedestrian within the detection area when reversing, a buzzer sounds and an icon is displayed on the multi-display to warn the driver.

FUNCTION OF COMPONENTS

Component

Function

Ultrasonic Sensor

Detects the distance between the vehicle and an obstacle

  • No. 1 Clearance Warning Buzzer
  • No. 2 Clearance Warning Buzzer

Sounds to inform the driver according to the distance to an obstacle

Combination Meter Assembly

- Multi-information Display

- Clearance Sonar Off Indicator

- RCD Off Indicator*1

- RCTA Off Indicator*3

  • Transmits the ON/OFF signal to the clearance warning ECU assembly
  • Displays the location of an obstacle and the approximate distance between the vehicle and static objects
  • Displays a malfunction of the ultrasonic sensor to inform the driver
  • Illuminates to inform the driver when the parking support alert system is off (the power switch is on (IG) and the parking support alert system is off)
  • Sends the temporary mute setting signal to the clearance warning ECU assembly via CAN communication

Steering Pad Switch Assembly

Enables, disables or cancels the operation of parking support alert system by transmitting the switch operation signal to the combination meter assembly

Clearance Warning ECU Assembly

  • Judges the approximate distance between the vehicle and a static object based on signals from the ultrasonic sensors and sends it to the multi-information display and parking assist ECU*1
  • Judges the approximate distance between the vehicle and an obstacle based on signals from the ultrasonic sensors and sends it to the multi-information display and rear television camera assembly*2
  • Judges the approximate distance between the vehicle and an obstacle based on signals from the ultrasonic sensors and sounds the buzzer
  • Receives the temporary mute setting signal and clearance sonar setting screen information from the combination meter assembly via CAN communication
  • Sends the display select signals to the multi-display assembly*5

Main Body ECU (Multiplex Network Body ECU)

Transmits the destination information to the clearance warning ECU assembly

Hybrid Vehicle Control ECU

Transmits the shift position signal to the clearance warning ECU assembly

Skid Control ECU

Sends a vehicle speed signal to the clearance warning ECU assembly via CAN communication

Multi-display Assembly

  • Receives video signals from the parking assist ECU*1 or rear television camera assembly*2, and displays them.
  • Transmits the customize setting information to the clearance warning ECU assembly

Parking Assist ECU*1

Receives ultrasonic sensor information via CAN communication and sends it to the multi-display assembly through the video signal cable

Rear Television Camera Assembly

  • Sends camera detection buzzer request signals to the blind spot monitor sensor via CAN communication*1
  • Receives ultrasonic sensor information via CAN communication and sends it to the multi-display assembly through the video signal cable*2

Blind Spot Monitor Sensor*3

  • Consists of a 24 GHz radar module and an integrated processing module
  • Illuminates or blinks the outer rear view mirror indicator on the outer mirror actuator assembly
  • Sounds the RCTA buzzer (blind spot monitor buzzer) when the RCTA function is operating
  • Dims the outer rear view mirror indicator on the outer rear view mirror assembly
  • Displays the RCTA icon on the multi-display assembly when the RCTA function is operating
  • Sends blind spot monitor system status signals to the clearance warning ECU assembly via CAN communication

Outer Rear View Mirror Assembly*3

- Outer Rear View Mirror Indicator

Turns on or blinks the indicator based on signals from the blind spot monitor sensor

RCTA Buzzer (Blind Spot Monitor Buzzer)*3

Sounds based on signals from the blind spot monitor sensor

Meter Mirror Sub-assembly*4

Receives the ultrasonic sensor information via CAN communication and displays it on the headup display

  • *1: w/ Panoramic View Monitor System
  • *2: w/o Panoramic View Monitor System
  • *3: w/ Blind Spot Monitor System
  • *4: w/ Headup Display System
  • *5: for 12.3 inch display

OPERATION DESCRIPTION (PARKING SUPPORT ALERT [STATIC OBJECTS] FUNCTION)

(a) The operating conditions of each ultrasonic sensor differ according to their installation position, as shown in the table below.

Installation Position

Operating Condition

Front Corner

  • Engine is running.
  • Static objects function is on.
  • Shift lever is in any position other than P.
  • Vehicle speed is less than approximately 10 km/h (6 mph).

Front Center

  • Engine is running.
  • Static objects function is on.
  • Shift lever is in any position other than P or R.
  • Vehicle speed is less than approximately 10 km/h (6 mph).

Rear Corner

  • Engine is running.
  • Static objects function is on.
  • Shift lever is in R.
  • Vehicle speed is less than approximately 10 km/h (6 mph).

Rear Center

When the system operates, the clearance warning ECU assembly transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within the range of one or more of the sensors, the waves are reflected back to the sensors, which transmit them to the clearance warning ECU assembly.

Based on this information, the clearance warning ECU assembly sends signals to the radio receiver assembly, the combination meter assembly and the No. 1 clearance warning buzzer and No. 2 clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzers sound.

HINT:

Refer to Detection Range Measurement and Display Inspection.

Click here

COMMUNICATION SIGNALS OF COMPONENTS (PARKING SUPPORT ALERT [STATIC OBJECTS] FUNCTION)

HINT:

  • Allocation refers to the process of the clearance warning ECU assembly setting aside IDs for the sensors.
  • The vehicle has the sensors arranged in 2 groups. There is a front series and a rear series. The sensors are connected in a "daisy chain".

(a) Initialization mode:

An ID is allocated to each sensor and sensor diagnosis is performed.

(1) When the initial check is performed (the power switch is on (IG) and the static objects function is on), the clearance warning ECU assembly provides power to the first sensor in each series (front corner ultrasonic sensor RH and rear corner ultrasonic sensor RH).

(2) After the power is supplied, the front corner ultrasonic sensor RH and rear corner ultrasonic sensor RH enter standby mode to receive an ID from the ECU. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to these sensors.

(3) The front corner ultrasonic sensor RH and rear corner ultrasonic sensor RH receive the ID allocation signal from the ECU and perform self-diagnosis. When the sensor self-diagnosis is complete, the ECU sends an ID allocation confirmation signal to the sensors.

(4) After the ID allocation confirmation is performed, the ECU provides power to the second sensor in each series (front center ultrasonic sensor RH and rear center ultrasonic sensor RH) via the first sensor. In the same manner as the first sensors, the second sensor enter standby mode. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to the second sensors.

(5) The above operation will be repeated until an ID is allocated to the last sensor (front corner ultrasonic sensor LH or rear corner ultrasonic sensor LH). Initialization ends when ID allocation to all ultrasonic sensors is completed.

(b) Detection mode:

After initialization is completed, the system changes to detection mode. In detection mode, the clearance warning ECU assembly sends information request signals and sensor activation signals to the ultrasonic sensors and receives detection result signals from the sensors.

(1) The ECU regularly sends ID signals, information request signals, and sensor activation signals to each ultrasonic sensor according to the communication schedule.

(2) When a certain amount of time has elapsed (sensor detection operation is completed), the ECU sends an ID signal to the sensor to receive a detection result signal.

(3) The ultrasonic sensor sends a detection result signal or detection information signal to the ECU.

(4) The above operation is performed repeatedly for each ultrasonic sensor.

OPERATION DESCRIPTION (PARKING SUPPORT ALERT [REAR CROSSING VEHICLES] FUNCTION)

(a) Operation description of the RCTA function

(1) Operation conditions:

  • The RCTA function is on.
  • The shift lever is in R.
  • The vehicle speed is less than approximately 8 km/h (5 mph).

(2) Conditions in which a sensor can detect a vehicle

The RCTA function indicates detection of a vehicle in the detection area when both conditions are met:

  • A vehicle is approaching from the right or left at the rear of the vehicle.
  • The vehicle speed is approximately 8 km/h (5 mph) to 28 km/h (18 mph).

(3) Detection area

Vehicles in the following areas can be detected:

*a

Within approximately 5.5 to 20 m (18.04 to 65.6 ft.) from side of vehicle (detection area changes according to vehicle speed)

*b

Within approximately 6 m (19.68 ft.) behind rear bumper

Detection Area

OPERATION OF OUTER REAR VIEW MIRROR INDICATOR AND RCTA BUZZER (BLIND SPOT MONITOR BUZZER) (PARKING SUPPORT ALERT [REAR CROSSING VEHICLES] FUNCTION)

(a) Initial check

(1) When the RCTA function is turned on with the power switch on (IG), the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 1 second.

(2) When the power switch is turned from off to on (IG) with the blind spot monitor system on, the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds.

(b) Operation for each function

(1) Operation for RCTA function

  • When all of the operation conditions for the RCTA function are met, the outer rear view mirror indicators on the outer rear view mirror assembly blink for 2.5 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 2.3 seconds as shown in the illustration.

*a

0.125 Seconds

*b

2.5 Seconds

*c

0.1 Seconds

*d

0.4 Seconds

*e

2.3 Seconds

-

-

RCTA ICON OUTLINE

(a) If a vehicle approaching from the right or left at the rear of the vehicle is detected, the icon will illuminate on the multi-display.

w/o Panoramic View Monitor System

*a

Narrow Rear View Screen

*b

Wide Rear View Screen

*c

RCTA Icon

-

-

for 8 inch display w/ Panoramic View Monitor System

*a

Narrow Rear View Screen

*b

Wide Rear View Screen

*c

Panoramic View and Rear View Screen

*d

RCTA Icon

for 12.3 inch display w/ Panoramic View Monitor System

*a

Panoramic View and Rear View Screen

*b

Panoramic View and Wide Rear View Screen

*c

RCTA Icon

-

-

OPERATION DESCRIPTION (PARKING SUPPORT ALERT [REAR PEDESTRIAN DETECTION] FUNCTION)

(a) Operation description of the rear camera detection function

(1) Operation conditions:

  • The power switch on (IG).
  • The shift lever is in R.

(2) Detection Area

*a

Detection Area

Detection Area A

Detection Area B

Detection Area C

Detection Area

Buzzer Operation

Pedestrian Detection Icon

A

Sounds repeatedly

Blinks 3 times and then stays on

B

  • When the vehicle is stationary: Sounds 3 times
  • When the vehicle is backing up: Sounds repeatedly

Blinks 3 times and then stays on

C

When it is determined that a pedestrian will enter area A within a few seconds: Sounds repeatedly

When it is determined that a pedestrian will enter area A within a few seconds: Blinks 3 times and then stays on

HINT:

  • Absolute Detection Area (3.0 m (9.8 ft.) from the edge of bumper, 3.0 m (9.8 ft.) wide)

    *a

    Edge of Bumper

    Absolute Detection Area

  • Absolute No Detection Area (Outside of 4.1 m (13.4 ft.) from the edge of the bumper, 7.2 m (23.6 ft.) wide)

    *a

    Edge of Bumper

    Absolute No Detection Area

(b) Rear camera detection function screen

for 8 inch display

*a

Narrow Rear View Screen

*b

Wide Rear View Screen

*c

Panoramic View and Rear View Screen

*d

Pedestrian Detection Icon

*e

RCD OFF Indicator (Displays Only when the rear camera detection function is OFF)

-

-

for 12.3 inch display

*a

Panoramic View and Rear View Screen

*b

Panoramic View and Wide Rear View Screen

*c

Pedestrian Detection Icon

*d

RCD OFF Indicator (Displays Only when the rear camera detection function is OFF)

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