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:

Lumbar support adjuster assembly
INSPECTION 1. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY  Check operation of the lumbar support adjuster motor.  Check if the lumbar support adjuster moves smoothly when the battery is connected to the lumbar support adjuster motor connector terminal. OK If the r ...

Reassembly
1. INSTALL REAR DRIVE SHAFT OUTBOARD JOINT BOOT HINT: Before install the boot, wrap the spline of the outboard joint shaft with vinyl tape to prevent the boot from bearing damaged. (a) Install new outboard joint boot, 2 outboard joint boot clamps, 2 inboard joint boot clamps and inboard j ...

Dtc check / clear
1. DTC CHECK/CLEAR (WHEN USING INTELLIGENT TESTER): (a) DTC check (1) Connect the intelligent tester to the DLC3. (2) Turn the ignition switch to the ON position. (3) Read the DTCs following the prompts on the tester screen. (b) DTC clear (1) Connect the intelligent tester to the DLC3 ...

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