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:

Removal
1. PRECAUTION CAUTION: Be sure to read "PRECAUTION" thoroughly before servicing. 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait for 90 seconds after disconnecting the cable to prevent the airbag working. 3. PLACE FRONT WHEELS FACING STRAIGHT AHEAD 4. REMOVE STEE ...

Installation
1. INSTALL POWER POINT SOCKET ASSEMBLY  Engage the 2 claws to install the power point socket assembly. 2. INSTALL INSTRUMENT CLUSTER CENTER LOWER FINISH PANEL SUB-ASSEMBLY 3. INSTALL POSITION INDICATOR HOUSING ASSEMBLY 4. INSTALL SHIFT LEVER KNOB SUB-ASSEMBLY 5. INSTALL INSTRU ...

Problem symptoms table
Proceed to the reference page shown in the table below for each malfunction symptom and troubleshoot each circuit. HINT: Troubleshooting of the theft deterrent system is based on the premise that the door lock control system and the wireless door lock control system are operating normally. Ac ...

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