LEXUS PARKING ASSIST-SENSOR SYSTEM No. 2 Clearance Warning Buzzer Circuit

DESCRIPTION

The clearance warning buzzer sounds to alert the driver and buzzer frequency changes depending on the distance to an obstacle.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   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
      Rear Buzzer	Rear clearance warning buzzer	Operate or Stop	-

      OK
      Rear clearance warning buzzer sounds.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - REAR CLEARANCE WARNING BUZZER) Click here

   OK

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

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

   
   

   1. 

      Disconnect the L159 ECU connector.

   2. Disconnect the R21 buzzer connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition L159-10 (BBZ) - R21-1 (Z+) Always Below 1 Ω L159-11 (EF) - R21-2 (Z-) Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. REPLACE REAR CLEARANCE WARNING BUZZER

   
   

   1. Temporarily replace the rear clearance warning buzzer with a new or normally functioning one Click here.

   2. Check the clearance warning buzzer sounds.

      OK
      Rear clearance warning buzzer sounds.

   
   

   NG

   REPLACE CLEARANCE WARNING ECU Click here

   OK

   END (REAR CLEARANCE WARNING BUZZER IS DEFECTIVE)