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.

WIRING DIAGRAM

A003UB8E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (REAR LEFT CENTER SENSOR - CLEARANCE WARNING ECU ASSEMBLY)


    1. Disconnect the f3 connector from the No. 1 ultrasonic sensor (rear left center sensor).

    2. Disconnect the E104 connector from the clearance warning ECU assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      f3-3 (T) - E104-12 (BOR) Always Below 1 Ω
      f3-2 (S) - E104-5 (S3) Always Below 1 Ω
      f3-1 (E) - E104-11 (E2) Always Below 1 Ω
      f3-3 (T) - Body ground Always 10 kΩ or higher
      f3-2 (S) - Body ground Always 10 kΩ or higher
      f3-1 (E) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)


    1. Replace the No. 1 ultrasonic sensor with a new or known good one Click here.


    NEXT

  3. CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM


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

      Tech Tips

      Refer to Operation Check (Initial Check) Click here.

      Result
      Result Proceed to
      Toyota parking assist-sensor system is malfunctioning A
      Toyota parking assist-sensor system is normal B

    B

    END (REAR LEFT CENTER SENSOR WAS DEFECTIVE)

    A

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