LEXUS 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 ECU operates the buzzer using a sound pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

B001MZUE30
*a No. 1 Clearance Warning Buzzer
*b Clearance Warning ECU Assembly

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    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 power switch is on (IG)
      OK
      The No. 1 clearance warning buzzer sounds.

    OK

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

    NG

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


    1. Disconnect the H23 No. 1 clearance warning buzzer connector.

    2. Disconnect the A78 clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A78-11 (CBZ) - H23-1 (Z+) Always Below 1 Ω
      A78-10 (EF) - H23-2 (Z-) Always Below 1 Ω
      A78-11 (CBZ) - Body ground Always 10 kΩ or higher
      A78-10 (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 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 power switch on (IG).

    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 power switch is on (IG)
      OK
      The No. 1 clearance warning buzzer sounds.

    OK

    END

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here