LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Warning Buzzer Circuit

DESCRIPTION

The clearance warning buzzer is an ECU-excited buzzer that sounds when it receives a pulsed digital pattern from the ECU. The ECU operates the buzzer using a sound pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

A01NFDCE02

INSPECTION PROCEDURE

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 Lexus 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 power switch is on (IG)
      Result
      Result Proceed to
      The clearance warning buzzer sounds A

      The clearance warning buzzer does not sound

      (w/o Parking Assist Monitor System)

      		 B

      The clearance warning buzzer does not sound

      (w/ Parking Assist 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. A01NFIGE06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Clearance Warning ECU)
      *2

      Front view of wire harness connector

      (to Clearance Warning Buzzer)

      Disconnect the F52 connector from the clearance warning ECU.

    2. Disconnect the F27 connector from the clearance warning buzzer.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F52-10 (BBZ) - F27-1 (Z+) Always Below 1 Ω
      F52-11 (EF) - F27-2 (Z-) Always Below 1 Ω
      F52-10 (BBZ) - Body ground Always 10 kΩ or higher
      F52-11 (EF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE 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 power switch on (IG).

    3. Turn the Lexus 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 power switch is on (IG)
      OK
      The clearance warning buzzer sounds.

    NG

    REPLACE CLEARANCE WARNING ECU Click here

    OK

    END (CLEARANCE WARNING BUZZER WAS DEFECTIVE)

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


    1. A01NG6ZE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Parking Assist ECU)
      *2

      Front view of wire harness connector

      (to Clearance Warning Buzzer)

      Disconnect the F54 connector from the parking assist ECU.

    2. Disconnect the F27 connector from the clearance warning buzzer.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F54-18 (BBZ) - F27-1 (Z+) Always Below 1 Ω
      F54-17 (EF) - F27-2 (Z-) Always Below 1 Ω
      F54-18 (BBZ) - Body ground Always 10 kΩ or higher
      F54-17 (EF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE CLEARANCE WARNING BUZZER


    1. Replace the 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 power switch on (IG).

    3. Turn the Lexus 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 power switch is on (IG)
      OK
      The clearance warning buzzer sounds.

    NG

    REPLACE PARKING ASSIST ECU Click here

    OK

    END (CLEARANCE WARNING BUZZER WAS DEFECTIVE)