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System Description
 
 
SYSTEM DIAGRAM
Part nameDescription
Sonar control unitSonar Control Unit
Each sensorSonar Sensor
Combination meter
  • Receiving a sonar indicator signal and parking sensor error signal via CAN communication.
  • Transmits system setting signal to the sonar control unit via CAN communication.
PHEV-ECUTransmits shift position signal to the sonar control unit via CAN communication.
ABS actuator and electric unit (control unit)Transmits the vehicle speed signal to the sonar control unit via CAN communication.
Around view monitor control unitReceiving a sonar indicator signal via CAN communication.
ADAS C/U2Receiving a sonar sensor signal via CAN communication.
 
 
Sonar Control Unit Input Signal (CAN Communication)
Transmit unitSignal name
Combination meterSystem setting signal
ABS actuator and electric unit (control unit)Vehicle speed signal
PHEV-ECUShift position signal
 
 
Sonar Control Unit Output Signal (CAN Communication)
Transmit unitSignal name
Combination meter
  • Sonar indicator signal
  • Parking sensor error signal
  • Buzzer output signal
Around view monitor control unitSonar indicator signal
ADAS C/U2Sonar sensor signal
 
 
DESCRIPTION
  • The sonar sensor installed to the front bumper and the rear bumper detects obstacles around the bumper.
  • The sonar control unit changes the buzzer cycle and the warning of the sonar indicator (combination meter and around view monitor control unit), according to a distance from an obstacle detected by the sonar sensor.
  • The sonar control unit controls the buzzer cycle according to a buzzer output signal transmitted to the combination meter and the around view monitor control unit via CAN communication.
  • The sonar control unit controls the sonar indicator according to a sonar indicator display signal transmitted to the combination meter and the around view monitor control unit via CAN communication.
  • The sonar control unit sends distance to obstacles information for the ADAS C/U2.
 
 
SONAR SYSTEM ACTIVATION CONDITION
The sonar system warns the driver of the presence or absence of obstacles by buzzer and the sonar indicator when the following conditions are satisfied while the electric motor switch is turned ON.
×: Activation
Shift positionVehicle speed (Approx.)Obstacle detecting sensorBuzzerSonar indicator
R10 km/h (6.2 mph) or lessFront sensor××
Rear sensor××
D10 km/h (6.2 mph) or lessFront sensor××
Rear sensor——
noteThe following items can be set for the sonar system on the settings screen of the combination meter.
  • Moving Object: ON/OFF
  • Auto Show Sonar: ON/OFF
  • Front: ON/OFF
  • Rear: ON/OFF
  • Distance: Long/Medium/Short
  • Volume
 
 
OBSTACLE DETECTION DISTANCE
The sonar control unit changes the sonar display and buzzer output according to the obstacle detection distance received from sensors.
 
 
Warning Buzzer Frequency
  • The warning buzzer output frequency changes according to the detection distance.
  • As the vehicle approaches an obstacle, the buzzer-sounding cycle becomes shorter.
  • The nearest sensor from the detected obstacle applies the buzzer output frequency if plural sensors detect any obstacle simultaneously.
noteBuzzer stops when the vehicle moves away from an obstacle and the warning level decreases.
  • 4 Sensor Models
    Obstacle detection range image
    A.Approx. 150 cm (59.06 in)
    (default value)
    		B.Approx. 60 cm (23.62 in)
    (default value)
  • 8 Sensor Models
    Obstacle detection range image
    A.Approx. 100 cm (39.37 in)
    (default value)
    		B.Approx. 60 cm (23.62 in)
    (default value)
    		C.Approx. 150 cm (59.06 in)
    (default value)
Detection distance (default value)
Detection distanceWarning buzzer frequency
30 cm or lessContinuous tone
30 - 35 cm10.0 Hz
35 - 50 cm9.0 Hz
50 - 70 cm6.66 Hz
70 - 90 cm5.0 Hz
90 - 120 cm4.0 Hz
120 - 150 cm3.0 Hz
150 - 180 cm2.5 Hz
180 cm or more2.0 Hz
  • Detection distance of an obstacle changes, as shown in the table below, when the detection sensitivity is changed on the settings screen of the information display of the combination meter.
    Detection distance
    Item (detection range)Corner sensorFront center sensorRear center sensor
    FARApprox. 66 cmApprox. 110 cmApprox. 165 cm
    NORMAL (default value)Approx. 60 cmApprox. 100 cmApprox. 150 cm
    NEARApprox. 54 cmApprox. 90 cmApprox. 135 cm
 
 
Sonar Indicator
  • The sonar control unit displays a warning on sonar indicator in three stages (green, yellow, and red), according to a distance from an obstacle.
    note
    • A distance from an obstacle is also displayed on the information display of the combination meter.
    • Sonar indicator is displayed also on Bird-Eye view and front-side view screen of around view monitor.
  • Warning displayed on the sonar indicator and a distance change according to a distance between an obstacle and sensor as shown in the following table.
    Status of warningDetection distance
    Corner sensorFront center sensorRear center sensor
    Red0 - 30 cm0 - 30 cm0 - 30 cm
    Yellow30 - 50 cm30 - 50 cm30 - 50 cm
    Green50 - 60 cm50 - 100 cm50 - 150 cm
 
 
MAC (Message Authentication Code)
MAC (Message Authentication Code) is a function that prevents unauthorized communication from other than the ECU with MAC function by secure authentication communication. Sonar control unit can write a MAC key required for communication between the ECUs and perform MAC diagnosis.