TOYOTA PARKING ASSIST-SENSOR SYSTEM Back Sonar Sensor Circuit

DESCRIPTION

This circuit consists of the sensor power supply, sensor ground and sensor signal wires between the clearance warning ECU assembly and ultrasonic sensors. The ultrasonic sensors are digital sensors.

WIRING DIAGRAM

B003RIAE01
*a No. 1 Ultrasonic Sensor (Rear Left Center)
*b No. 1 Ultrasonic Sensor (Rear Right Center)
*c Clearance Warning ECU Assembly

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 ULTRASONIC SENSOR [REAR RIGHT CENTER])


    1. Disconnect the G88 clearance warning ECU assembly connector.

    2. Disconnect the P2 No. 1 ultrasonic sensor (rear right center) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G88-12 (BOR) - P2-1 (BI) Always Below 1 Ω
      G88-14 (SOR) - P2-3 (SI) Always Below 1 Ω
      G88-13 (E1) - P2-5 (EI) Always Below 1 Ω
      G88-12 (BOR) or P2-1 (BI) - Body ground Always 10 kΩ or higher
      G88-14 (SOR) or P2-3 (SI) - Body ground Always 10 kΩ or higher
      G88-13 (E1) or P2-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [REAR RIGHT CENTER] - NO. 1 ULTRASONIC SENSOR [REAR LEFT CENTER])


    1. Disconnect the P2 No. 1 ultrasonic sensor (rear right center) connector.

    2. Disconnect the P1 No. 1 ultrasonic sensor (rear left center) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P2-2 (BO) - P1-1 (BI) Always Below 1 Ω
      P2-4 (SO) - P1-3 (SI) Always Below 1 Ω
      P2-6 (EO) - P1-5 (EI) Always Below 1 Ω
      P2-2 (BO) or P1-1 (BI) - Body ground Always 10 kΩ or higher
      P2-4 (SO) or P1-3 (SI) - Body ground Always 10 kΩ or higher
      P2-6 (EO) or P1-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT NO. 1 ULTRASONIC SENSOR (REAR RIGHT SIDE, REAR LEFT SIDE)


    1. Remove the No. 1 ultrasonic sensor.

      Click here

    2. Inspect the No. 1 ultrasonic sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE NO. 1 ULTRASONIC SENSOR Click here