LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Warning Buzzer Circuit

DESCRIPTION

This circuit consists of the No. 1 clearance warning buzzer and clearance warning ECU assembly. An ECU-excited type buzzer is used. The ECU operates the buzzers using a sound pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

*a	No. 1 Clearance Warning Buzzer
*b	Clearance Warning ECU Assembly

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power 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.

      
      Body Electrical > Clearance Sonar > Active Test

      Tester Display	Measurement Item	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)

      
      Body Electrical > Clearance Sonar > Active Test

      Tester Display
      Buzzer

      OK
      The No. 1 clearance warning buzzer sounds.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE CLEARANCE WARNING ECU ASSEMBLY for LHD: Click here REPLACE CLEARANCE WARNING ECU ASSEMBLY for RHD: Click here

   NG

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

   
   

   1. Disconnect the K44 clearance warning ECU assembly connector.

   2. Disconnect the K45 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 K44-11 (CBZ) - K45-1 (Z+) Always Below 1 Ω K44-10 (EF) - K45-2 (Z-) Always Below 1 Ω K44-11 (CBZ) - Body ground Always 10 kΩ or higher K44-10 (EF) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   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 known good one.

      Click here

      Result
      Proceed to NEXT

   
   

   NEXT

4. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power 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.

      
      Body Electrical > Clearance Sonar > Active Test

      Tester Display	Measurement Item	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)

      
      Body Electrical > Clearance Sonar > Active Test

      Tester Display
      Buzzer

      OK
      The No. 1 clearance warning buzzer sounds.

      Result
      Proceed to OK NG

   
   

   OK

   END

   NG

   REPLACE CLEARANCE WARNING ECU ASSEMBLY for LHD: Click here REPLACE CLEARANCE WARNING ECU ASSEMBLY for RHD: Click here