TOYOTA PARKING ASSIST-SENSOR SYSTEM Clearance Warning Buzzer Circuit

DESCRIPTION

The clearance warning buzzer sounds to alert the driver and the buzzed frequency changes depending on the distance to an obstacle.

WIRING DIAGRAM

A004OYTE03
*a from ECU-IG NO. 3 Fuse
*b No. 1 Clearance Warning Buzzer
*c Clearance Warning ECU

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (NO. 1 CLEARANCE WARNING BUZZER - BATTERY)

    A004NK3E02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to No. 1 Clearance Warning Buzzer)

    1. Disconnect the D18 buzzer connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D18-1 (Z+) - Body ground Ignition switch ON 11 to 14 V
      D18-1 (Z+) - Body ground Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 CLEARANCE WARNING BUZZER - CLEARANCE WARNING ECU)

    A004MOUE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Clearance Warning ECU)
    *2

    Front view of wire harness connector

    (to No. 1 Clearance Warning Buzzer)

    1. Disconnect the D65 ECU connector.

    2. Disconnect the D18 buzzer connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D65-6 (BBZ) - D18-2 (Z-) Always Below 1 Ω
      D65-6 (BBZ) - 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 normally functioning or new one Click here.


    NEXT

  4. CHECK NO. 1 CLEARANCE WARNING BUZZER


    1. Check that the No. 1 clearance warning buzzer operates normally.

      OK
      No. 1 clearance warning buzzer operates normally.

    OK

    END

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here