TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 8 Sensor Type) 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

A01QQ1EE04
*a No. 1 Clearance Warning Buzzer
*b Clearance Warning ECU Assembly

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to 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 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.
      Result
      Proceed to
      OK
      NG

    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 G166 clearance warning ECU assembly connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G166-14 (CBZ) - G34-1 (Z+) Always Below 1 Ω
      G166-13 (EF) - G34-2 (Z-) Always Below 1 Ω
      G166-14 (CBZ) or G34-1 (Z+) - Body ground Always 10 kΩ or higher
      G166-13 (EF) or G34-2 (Z-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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

      Result
      Proceed to
      NEXT

    NEXT

  4. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to 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 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.
      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 ASSEMBLY Click here

    C

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here