TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 4 Sensor Type) Rear Clearance Sonar Sensor RH Circuit

DESCRIPTION

The ultrasonic sensor sends and receives ultrasonic waves. Based on the received wave, the sensor calculates the approximate distance between the vehicle and the obstacle, and sends the distance value as a signal to the clearance warning ECU assembly.

WIRING DIAGRAM

A01QUI7E08
*a No. 3 Ultrasonic Sensor (Rear Corner Sensor RH)
*b No. 3 Ultrasonic Sensor (Rear Center Sensor RH)

PROCEDURE


  1. CHECK NO. 3 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)


    1. Replace the No. 3 ultrasonic sensor (rear corner sensor RH) with a normally functioning sensor.

      Click here

      Tech Tips

      All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

    2. Check the operation of the Toyota parking assist-sensor system.

      Click here

      Result
      Proceed to
      Toyota parking assist-sensor system normal operation
      Toyota parking assist-sensor system malfunction

    Toyota parking assist-sensor system normal operation

    END (REAR CORNER SENSOR RH IS DEFECTIVE)

    Toyota parking assist-sensor system malfunction

  2. CHECK HARNESS AND CONNECTOR (REAR CORNER SENSOR RH - REAR CENTER SENSOR RH)


    1. Disconnect the S1 No. 3 ultrasonic sensor (rear corner sensor RH) connector.

    2. Disconnect the S2 No. 3 ultrasonic sensor (rear center sensor RH) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      S1-3 (SI) - S2-4 (SO) Always Below 1 Ω
      S1-1 (BI) - S2-2 (BO) Always Below 1 Ω
      S1-5 (EI) - S2-6 (EO) Always Below 1 Ω
      S1-3 (SI) - Body ground Always 10 kΩ or higher
      S1-1 (BI) - Body ground Always 10 kΩ or higher
      S1-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR