TOYOTA PARKING ASSIST-SENSOR SYSTEM (for 4 Sensor Type) Rear Clearance 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 obstacle and sends the distance value as a signal to the clearance warning ECU.

WIRING DIAGRAM

A0098ECE23

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)


    1. A00991UE01

      Remove the No. 1 ultrasonic sensor (rear corner 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

    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (REAR CORNER SENSOR LH - CLEARANCE WARNING ECU)


    1. Disconnect the V2 No. 1 ultrasonic sensor (rear corner sensor LH) connector.

    2. Disconnect the I1 clearance warning ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V2-1 (BI) - I1-24 (BOR) Always Below 1 Ω
      V2-3 (SI) - I1-6 (SOR) Always Below 1 Ω
      V2-5 (EI) - I1-22 (E2) Always Below 1 Ω
      V2-1 (BI) - Body ground Always 10 kΩ or higher
      V2-3 (SI) - Body ground Always 10 kΩ or higher
      V2-5 (EI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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