LEXUS PARKING ASSIST-SENSOR SYSTEM No. 1 Clearance Warning Buzzer Circuit

DESCRIPTION

The clearance warning ECU receives the ultrasonic sensor signal to sound the clearance warning buzzer.

WIRING DIAGRAM

A0161K8E01

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Turn the clearance sonar main switch ON.

    5. 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
      Rear Buzzer Rear buzzer (Clearance warning buzzer) STOP or OPERATE -
      OK
      The clearance warning buzzer sounds.

    NG

    INSPECT FUSE (RH-IG) Click here

    OK

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

  2. INSPECT FUSE (RH-IG)


    1. Remove the RH-IG fuse from the cowl side center junction block RH

    2. Measure the resistance of the RH-IG fuse.

      Standard Resistance
      Tester Item Condition Specified Condition
      RH-IG fuse Always Below 1 Ω

    NG

    REPLACE FUSE (RH-IG)

    OK

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING BUZZER - BATTERY)


    1. A0161TQE01

      Disconnect the clearance warning buzzer connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J39-1 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE WARNING BUZZER)


    1. A0163KRE07

      Disconnect the clearance warning ECU connector.

    2. A0161TQE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q37-9 (CBZ) - J39-2 Always Below 1 Ω
      Q37-9 (CBZ) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT CLEARANCE WARNING BUZZER


    1. A0163AHE02

      Apply battery voltage and check operation of the clearance warning buzzer, as shown in the table.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → J39-1

      Battery negative (-) → J39-2

      		 Operating sound occurs

      Tech Tips

      The clearance warning buzzer does not sound without battery voltage applied because the buzzer is a separately-excited type.


    NG

    REPLACE CLEARANCE WARNING BUZZER Click here

    OK

    REPLACE CLEARANCE WARNING ECU Click here