TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 4 Sensor Type) Back Sonar Sensor LH 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

A01QUI7E05
*a No. 3 Ultrasonic Sensor (Rear Center Sensor LH)
*b No. 3 Ultrasonic Sensor (Rear Corner Sensor LH)

PROCEDURE


  1. INSPECT NO. 3 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)


    1. A01QR4TE01

      Remove the No. 3 ultrasonic sensor (rear center sensor LH).

      Click here

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

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

    NG

    REPLACE NO. 3 ULTRASONIC SENSOR (REAR CENTER SENSOR LH) Click here

    OK

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


    1. Disconnect the S3 No. 3 ultrasonic sensor (rear center sensor LH) connector.

    2. Disconnect the S4 No. 3 ultrasonic sensor (rear corner sensor LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S3-3 (SI) - S4-4 (SO) Always Below 1 Ω
      S3-1 (BI) - S4-2 (BO) Always Below 1 Ω
      S3-5 (EI) - S4-6 (EO) Always Below 1 Ω
      S3-3 (SI) - Body ground Always 10 kΩ or higher
      S3-1 (BI) - Body ground Always 10 kΩ or higher
      S3-5 (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