TOYOTA PARKING ASSIST-SENSOR SYSTEM Clearance Warning Buzzer Circuit

DESCRIPTION

This circuit consists of the No. 1 clearance warning buzzer and clearance warning ECU assembly. An ECU-excited type buzzer is used. The battery voltage supplied through the buzzer is grounded inside the clearance warning ECU assembly using a pulsed digital pattern, producing sound. The ECU operates the buzzer using a sound pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

B000HT5E04

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 intelligent tester on.

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

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

      Clearance Sonar
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer No. 1 clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the ignition switch is ON
      OK
      The No. 1 clearance warning buzzer sounds.

    NG

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER) Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER)


    1. Disconnect the I54 connector from the No. 1 clearance warning buzzer.

    2. Disconnect the I82 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
      I82-14 (BBZ) - I54-1 (Z+) Always Below 1 Ω
      I82-13 (ER) - I54-2 (Z-)
      I82-14 (BBZ) - Body ground 10 kΩ or higher
      I82-13 (ER) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE NO. 1 CLEARANCE WARNING BUZZER


    1. Replace the No. 1 clearance warning buzzer with a new or known good 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 intelligent tester on.

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

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

      Clearance Sonar
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer No. 1 clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the ignition switch is ON
      OK
      The No. 1 clearance warning buzzer sounds.

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    OK

    END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)