Toyota RAV4 manuals

Toyota Sienna Service Manual: System description

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

Parts location
SYSTEM DIAGRAM ...

How to proceed with troubleshooting
1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS 3 CHECK INITIAL CHECK FUNCTION 4 PROBLEM SYMPTOMS TABLE THE CORRESPONDING SYSTEM DOES NOT EXIST (Go to step 5) 5 BASED ON THE MALFUNCTION ...

Other materials:

Parking Brake Switch Circuit
DESCRIPTION This circuit is from the parking brake switch to the radio and navigation assembly. WIRING DIAGRAM INSPECTION PROCEDURE 1 CHECK BRAKE WARNING LIGHT Check that the brake warning light comes on when the parking brake is applied and goes off when it is released. OK: The ...

On-vehicle inspection
1. INSPECT SPEEDOMETER  Check the operation.  Using a speedometer tester, check the speedometer indication according to the table below. Reference: mph (U.S.A.) Reference: km/h (Canada) NOTICE: Tire wear as well as over or under inflation will cause errors. ...

Idle Control System Malfunction
DTC P0505 Idle Control System Malfunction DESCRIPTION The idling speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the Throttle Position (TP) sen ...

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