TOYOTA PARKING ASSIST-SENSOR SYSTEM 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.

WIRING DIAGRAM

A002LLQE01

PROCEDURE


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


    1. A002MV8E01

      Remove the No. 1 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 (E) - 2 (S) Always 20 to 40 kΩ

    NG

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

    OK

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


    1. Disconnect the U3 No. 1 ultrasonic sensor (rear center sensor LH) connector.

    2. Disconnect the H95 clearance warning ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U3-2 (S) - H95-16 (S4) Always Below 1 Ω
      U3-1 (E) - H95-15 (E4) Always Below 1 Ω
      U3-2 (S) - Body ground Always 10 kΩ or higher
      U3-1 (E) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR