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LEXUS PARKING ASSIST-SENSOR SYSTEM > Clearance Warning Buzzer Circuit

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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 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


E222365E01


INSPECTION PROCEDURE

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

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the LEXUS parking assist-sensor system on.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Clearance Sonar / Active Test.

  1. 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 power switch is on (IG)

    OK:
    The No. 1 clearance warning buzzer sounds.



NG
Go to step 2
OK

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

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

  1. Disconnect the H23 connector from the No. 1 Clearance Warning Buzzer.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H23-1 (Z+) - Body ground
    		Power switch on (IG)
    		11 to 14 V
    H23-1 (Z+) - Body ground
    		Power switch off
    		Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the A49 connector from the clearance warning ECU assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A49-12 (CBZ) - H23-2 (Z-)
    		Always
    		Below 1 Ω
    A49-12 (CBZ) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE NO. 1 CLEARANCE WARNING BUZZER

  1. Replace the No. 1 clearance warning buzzer with a new or known good one (Click here).


NEXT


5.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the LEXUS parking assist-sensor system on.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Clearance Sonar / Active Test.

  1. 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 power switch is on (IG)

    OK:
    The No. 1 clearance warning buzzer sounds.



NG
REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)
OK

END (CLEARANCE WARNING BUZZER WAS DEFECTIVE)