TOYOTA PARKING ASSIST-SENSOR SYSTEM 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

B006LMUE01
*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 engine switch on (IG).

    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.


      Body Electrical > Clearance Sonar > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Buzzer NO. 1 clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the engine switch is on (IG)

      Body Electrical > Clearance Sonar > Active Test
      Tester Display
      Buzzer
      OK
      The NO. 1 clearance warning buzzer sounds.
      Result
      Result
      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 G59 clearance warning ECU assembly connector.

    2. Disconnect the G18 NO. 1 clearance warning buzzer assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G59-14 (CBZ) - G18-1 (Z+) Always Below 1 Ω
      G59-13 (EF) - G18-2 (Z-) Always Below 1 Ω
      G59-14 (CBZ) - Body ground Always 10 kΩ or higher
      G59-13 (EF) - Body ground Always 10 kΩ or higher
      Result
      Result
      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
      Result
      NEXT

    NEXT

  4. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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.


      Body Electrical > Clearance Sonar > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Buzzer NO. 1 clearance warning buzzer Operate or Stop Confirm that the vehicle is stopped and the engine switch is on (IG)

      Body Electrical > Clearance Sonar > Active Test
      Tester Display
      Buzzer
      OK
      The NO. 1 clearance warning buzzer sounds.
      Result
      Result
      OK
      NG

    OK

    END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here