LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Warning Buzzer Circuit

DESCRIPTION

This circuit consists of a power source, the No. 1 clearance warning buzzer and clearance warning ECU assembly. An ECU-excited type buzzer is used. The battery voltage supplied through the buzzer is grounded inside the clearance warning ECU assembly using a pulsed digital pattern, producing sound. The ECU operates the buzzer using a sound pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

A01FEXYE01

INSPECTION PROCEDURE

Note

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

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.

      Clearance Sonar
      Tester Display Test Part 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)
      OK
      The No. 1 clearance warning buzzer sounds.

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 CLEARANCE WARNING BUZZER - CLEARANCE WARNING ECU ASSEMBLY) Click here

    OK

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

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


    1. Disconnect the N10 connector from the clearance warning ECU assembly connector.

    2. Disconnect the N45 connector from the No. 1 clearance warning buzzer.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N10-15 (CBZ) - N45-1 (Z+) Always Below 1 Ω
      N10-16 (EF) - N45-2 (Z-) Always Below 1 Ω
      N10-15 (CBZ) or N45-1 (Z+) - Body ground Always 10 kΩ or higher
      N10-16 (EF) or N45-2 (Z-) - 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 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.

      Clearance Sonar
      Tester Display Test Part 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)
      OK
      The No. 1 clearance warning buzzer sounds.

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    OK

    END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)