TOYOTA PARKING ASSIST-SENSOR SYSTEM (for 8 Sensor Type) Clearance Warning Buzzer Circuit

DESCRIPTION

The clearance warning buzzer is an ECU-operated buzzer that sounds when it receives a pulsed digital signal from the ECU. The ECU operates the buzzer so that it sounds in a pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

A009616E01
A009616E02

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the TOYOTA parking assist-sensor system on.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Body / Clearance Sonar / Active Test.

    6. Check that the buzzer operates by performing the Active Test.

      Clearance Sonar
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the ignition switch is ON
      Result
      Result Proceed to
      Clearance warning buzzer sounds A

      Clearance warning buzzer does not sound

      (w/o Parking Assist Monitor System and/or Side Monitor System)

      		 B

      Clearance warning buzzer does not sound

      (w/ Parking Assist Monitor System and/or Side Monitor System)

      		 C

    B

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE WARNING BUZZER) Click here

    C

    CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - CLEARANCE WARNING BUZZER) Click here

    A

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

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE WARNING BUZZER)


    1. Disconnect the I1 clearance warning ECU connector.

    2. Disconnect the G34 No. 1 clearance warning buzzer assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-10 (BBZ) - G34-1 (Z+) Always Below 1 Ω
      I1-11 (EF) - G34-2 (Z-) Always Below 1 Ω
      I1-10 (BBZ) - Body ground Always 10 kΩ or higher
      I1-11 (EF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE NO. 1 CLEARANCE WARNING BUZZER


    1. Replace the clearance warning buzzer with a new or normally functioning one Click here.


    NEXT

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the TOYOTA parking assist-sensor system on.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Body / Clearance Sonar / Active Test.

    6. Check that the buzzer operates by performing the Active Test.

      Clearance Sonar
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the ignition switch is ON
      OK
      The clearance warning buzzer sounds.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

    REPLACE CLEARANCE WARNING ECU Click here

    A

    END (CLEARANCE WARNING BUZZER WAS DEFECTIVE)

  5. CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - CLEARANCE WARNING BUZZER)


    1. Disconnect the I3 parking assist ECU connector.

    2. Disconnect the G34 No. 1 clearance warning buzzer assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I3-18 (BBZ) - G34-1 (Z+) Always Below 1 Ω
      I3-17 (EF) - G34-2 (Z-) Always Below 1 Ω
      I3-18 (BBZ) - Body ground Always 10 kΩ or higher
      I3-17 (EF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE NO. 1 CLEARANCE WARNING BUZZER


    1. Replace the No. 1 clearance warning buzzer with a new or normally functioning one Click here.


    NEXT

  7. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the TOYOTA parking assist-sensor system on.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Body / Clearance Sonar / Active Test.

    6. Check that the buzzer operates by performing the Active Test.

      Clearance Sonar
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the ignition switch is ON
      OK
      The clearance warning buzzer sounds.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE PARKING ASSIST ECU Click here

    C

    REPLACE PARKING ASSIST ECU Click here

    A

    END (CLEARANCE WARNING BUZZER WAS DEFECTIVE)