TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/o Multi-display) 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

B001HZVE31
*a No. 1 Ultrasonic Sensor (Rear Corner Sensor LH)
*b Clearance Warning ECU

PROCEDURE


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


    1. A01XLMPE01

      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 V5 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
      V5-1 (BI) - I1-24 (BOR) Always Below 1 Ω
      V5-3 (SI) - I1-6 (SOR) Always Below 1 Ω
      V5-5 (EI) - I1-22 (E2) Always Below 1 Ω
      V5-1 (BI) - Body ground Always 10 kΩ or higher
      V5-3 (SI) - Body ground Always 10 kΩ or higher
      V5-5 (EI) - 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