TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/ Multi-display) Clearance Warning Buzzer Circuit

DESCRIPTION

The No. 1 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

B001CKAE05

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the Ignition switch ON.

    3. Turn the GTS 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

      Operate: No. 1 clearance warning buzzer ON

      Stop: No. 1 clearance warning buzzer OFF

      		 Confirm that the vehicle is stopped and the ignition switch is ON
      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 - CLEARANCE WARNING BUZZER)


    1. Disconnect the I9*1 or G228*2 clearance warning ECU connector.


      • *1: for 4 Sensor Type

      • *2: for 8 Sensor Type

    2. Disconnect the G161 No. 1 clearance warning buzzer connector.

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

      Standard Resistance
      for 4 Sensor Type
      Tester Connection Condition Specified Condition
      I9-14 (BBZ) - G161-1 (Z+) Always Below 1 Ω
      I9-13 (ER) - G161-2 (Z-) Always Below 1 Ω
      I9-14 (BBZ) - Body ground Always 10 kΩ or higher
      I9-13 (ER) - Body ground Always 10 kΩ or higher
      for 8 Sensor Type
      Tester Connection Condition Specified Condition
      G228-14 (CBZ) - G161-1 (Z+) Always Below 1 Ω
      G228-13 (EF) - G161-2 (Z-) Always Below 1 Ω
      G228-14 (CBZ) - Body ground Always 10 kΩ or higher
      G228-13 (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 normally functioning one Click here.


    NEXT

  4. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the Ignition switch ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / 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

      Operate: No.1 clearance warning buzzer ON

      Stop: No. 1 clearance warning buzzer OFF

      		 Confirm that the vehicle is stopped and the ignition switch is ON
      OK
      The No. 1 clearance warning buzzer sounds.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

    REPLACE CLEARANCE WARNING ECU Click here