Toyota Sienna Quiz
Park assist / monitoring

System description

In this manual: Park assist / monitoring
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
2steps
~12min
1/5difficulty
Done 0 of 2

1. GENERAL

  1. 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 the obstacles as well as their positions by indicating them on the clearance sonar display and by sounding a buzzer.

2. FUNCTIONS OF COMPONENTS

Components

Function
Ultrasonic Sensor Ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a pre-amplifier that amplifies the waves. The ultrasonic sensor outputs the ultrasonic transmission and reception signals to the clearance warning ECU.
Clearance Sonar Main Switch Turns the clearance sonar system on and off.
Clearance Warning Buzzer Emits an intermittent sound to inform the driver that the ECU has detected an obstacle within prescribed ranges.
Clearance Warning ECU Judges the approximate distance between the vehicle and the obstacle based on the signals from the ultrasonic sensors and sends the display signal to the clearance sonar indicator and the buzzer signal to the clearance warning buzzer.
Indicators Displays the location of the obstacle and the approximate distance between the vehicle and the obstacle.
Speed Sensor Detects speed of each wheel and inputs the data into the clearance warning ECU via the combination meter.
Park / Neutral Position Switch (A/T) Sends a signal that activates the clearance sonar system when the shift lever is moved to the R position.

3. OPERATION EXPLANATION

  1. The clearance warning ECU determines whether the clearance sonar system should be operated based on the clearance sonar main switch on/off stratus, the shift position and the vehicle speed.
  2. When the system operates, the clearance warning ECU transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within one or more of the sensors' ranges, the waves are reflected back to the sensors, which transmit them to the clearance warning ECU.
Based on this information, the clearance warning ECU sends signals to the indicator and the clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.

HINT: Refer to "OPERATION CHECK" for detailed operation

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A quick Toyota Sienna quiz: every answer comes with an explanation and a link to the manual page.