LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Warning Buzzer Circuit

DESCRIPTION

The No. 1 clearance warning buzzer sounds to alert the driver and the buzzed frequency changes depending on the distance to an obstacle.

WIRING DIAGRAM

A01EPO5E03
A01EPO5E04

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (NO. 1 CLEARANCE WARNING BUZZER)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the buzzer operates.

      Clearance Sonar
      Tester Display Test Part Control Range Diagnostic Note
      Buzzer No. 1 clearance warning buzzer Operate or Stop -
      OK
      No. 1 clearance warning buzzer sounds.
      Result
      Result Proceed to
      OK A
      NG (w/ Side Monitor System) B
      NG (w/o Side Monitor System) C

    B

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

    C

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

    A

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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


    1. Disconnect the F74 parking assist ECU connector.

    2. Disconnect the E10 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
      F74-7 (BBZ) - E10-1 (Z+) Always Below 1 Ω
      F74-6 (EF) - E10-2 (Z-) Always Below 1 Ω
      F74-7 (BBZ) - Body ground Always 10 kΩ or higher
      F74-6 (EF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 CLEARANCE WARNING BUZZER Click here

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


    1. Disconnect the F12 clearance warning ECU assembly connector.

    2. Disconnect the E10 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
      F12-10 (BBZ) - E10-1 (Z+) Always Below 1 Ω
      F12-11 (EF) - E10-2 (Z-) Always Below 1 Ω
      F12-10 (BBZ) - Body ground Always 10 kΩ or higher
      F12-11 (EF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 CLEARANCE WARNING BUZZER Click here