TOYOTA PARKING ASSIST-SENSOR SYSTEM(for Sedan without Simple Intelligent Parking Assist System) Clearance Warning Buzzer Circuit

DESCRIPTION

This circuit consists of the No. 1 clearance warning buzzer, No. 2 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
*c	No. 2 Clearance Warning Buzzer

PROCEDURE

1. CHECK CLEARANCE WARNING BUZZER

   
   

   1. Check the operation of the No. 1 and No. 2 clearance warning buzzers.

      Click here

      Result
      Result Proceed to Buzzer does not sound when an obstacle is detected in front or at the rear of the vehicle. A Buzzer does not sound only when an obstacle is detected in front of the vehicle. B Buzzer does not sound only when an obstacle is detected at the rear of the vehicle. C

   
   

   A

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

   C

   PERFORM ACTIVE TEST USING GTS Click here

   B

2. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Clearance Sonar/Simple-IPA. / Active Test.

   5. Check that the front buzzer operates by performing the Active Test.

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Front Buzzer	No. 1 clearance warning buzzer	Stop or Operate	Confirm that the vehicle is stopped and the ignition switch is ON

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display
      Front Buzzer

      OK
      The No. 1 clearance warning buzzer sounds.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

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

   
   

   1. Disconnect the E98 clearance warning ECU assembly connector.

   2. Disconnect the E99 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 E98-12 (CBZ) - E99-1 (Z+) Always Below 1 Ω E98-6 (EF) - E99-2 (Z-) Always Below 1 Ω E98-12 (CBZ) - Body ground Always 10 kΩ or higher E98-6 (EF) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   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

      Result
      Proceed to NEXT

   
   

   NEXT

5. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Clearance Sonar/Simple-IPA. / Active Test.

   5. Check that the front buzzer operates by performing the Active Test.

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Front Buzzer	No. 1 clearance warning buzzer	Stop or Operate	Confirm that the vehicle is stopped and the ignition switch is ON

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display
      Front Buzzer

      OK
      The No. 1 clearance warning buzzer sounds.

      Result
      Result Proceed to OK A NG B

   
   

   A

   END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)

   B

   REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

6. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Clearance Sonar/Simple-IPA. / Active Test.

   5. Check that the rear buzzer operates by performing the Active Test.

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Rear Buzzer	No. 2 clearance warning buzzer	Stop or Operate	Confirm that the vehicle is stopped and the ignition switch is ON

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display
      Rear Buzzer

      OK
      The No. 2 clearance warning buzzer sounds.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

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

   
   

   1. Disconnect the E98 clearance warning ECU assembly connector.

   2. Disconnect the L41 No. 2 clearance warning buzzer connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition E98-13 (BBZ) - L41-1 (Z+) Always Below 1 Ω E98-5 (ER) - L41-2 (Z-) Always Below 1 Ω E98-13 (BBZ) - Body ground Always 10 kΩ or higher E98-5 (ER) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. REPLACE NO. 2 CLEARANCE WARNING BUZZER

   
   

   1. Replace the No. 2 clearance warning buzzer with a new or known good one.

      Click here

      Result
      Proceed to NEXT

   
   

   NEXT

9. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Clearance Sonar/Simple-IPA. / Active Test.

   5. Check that the rear buzzer operates by performing the Active Test.

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Rear Buzzer	No. 2 clearance warning buzzer	Stop or Operate	Confirm that the vehicle is stopped and the ignition switch is ON

      
      Body Electrical > Clearance Sonar / Simple-IPA. > Active Test

      Tester Display
      Rear Buzzer

      OK
      The No. 2 clearance warning buzzer sounds.

      Result
      Result Proceed to OK A NG B

   
   

   A

   END (NO. 2 CLEARANCE WARNING BUZZER WAS DEFECTIVE)

   B

   REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here