TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 8 Sensor Type) Clearance Warning Buzzer Circuit

DTC Code DTC Name
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

E309542E04

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.

      Table 1. 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.

      Table 2. 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