TOYOTA PARKING ASSIST-SENSOR SYSTEM Back Sonar Sensor Circuit

DESCRIPTION

This circuit includes the sensor power supply, sensor ground, and sensor signal wires between the rear clearance warning ECU assembly and No. 1 ultrasonic sensors. The No. 1 ultrasonic sensors are digital sensors.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK REAR CLEARANCE WARNING ECU ASSEMBLY

   
   

   1. 

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

      Standard Resistance
      Tester Connection Condition Specified Condition C25-22 (E2) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition C25-24 (BOR) - C25-22 (E2) Ignition switch ON, back sonar or clearance sonar switch on 7.2 to 8.8 V

   
   

   NG

   REPLACE REAR CLEARANCE WARNING ECU ASSEMBLY Click here

   OK

2. CHECK HARNESS AND CONNECTOR (REAR CLEARANCE WARNING ECU ASSEMBLY - REAR SENSOR RH)

   
   

   1. 

      Disconnect the C25 rear clearance warning ECU assembly connector.

   2. 

      Disconnect the U5 No. 1 ultrasonic sensor (rear sensor RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition C25-24 (BOR) - U5-1 (BI) Always Below 1 Ω C25-6 (SOR) - U5-3 (SI) Always Below 1 Ω C25-22 (E2) - U5-5 (EI) Always Below 1 Ω C25-24 (BOR) - Body ground Always 10 kΩ or higher C25-6 (SOR) - Body ground Always 10 kΩ or higher C25-22 (E2) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK HARNESS AND CONNECTOR (REAR SENSOR RH - REAR SENSOR LH)

   
   

   1. 

      Disconnect the U5 No . 1 ultrasonic sensor (rear sensor RH) connector.

   2. 

      Disconnect the U4 No. 1 ultrasonic sensor (rear sensor LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition U5-2 (BO) - U4-1 (BI) Always Below 1 Ω U5-4 (SO) - U4-3 (SI) Always Below 1 Ω U5-6 (EO) - U4-5 (EI) Always Below 1 Ω U5-2 (BO) - Body ground Always 10 kΩ or higher U5-4 (SO) - Body ground Always 10 kΩ or higher U5-6 (EO) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. INSPECT NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)

   
   

   1. 

      Remove the No. 1 ultrasonic sensor (rear sensor RH) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (BI) - 5 (EI) Always 10 kΩ or higher 1 (BI) - 2 (BO) Always 10 kΩ or higher 3 (SI) - 4 (SO) Always Below 1 Ω 5 (EI) - 6 (EO) Always Below 1 Ω

   
   

   NG

   REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH) Click here

   OK

5. CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM

   
   

   1. Check the operation of the TOYOTA parking assist-sensor system Click here.

      Result

      Result	Proceed to
      TOYOTA parking assist-sensor system malfunction	A
      TOYOTA parking assist-sensor system normal operation	B

   
   

   B

   END

   A

6. REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR LH)

   
   

   1. Replace the No. 1 ultrasonic sensor (rear sensor LH) Click here.

   
   

   NEXT

7. CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM

   
   

   1. Check the operation of the TOYOTA parking assist-sensor system Click here.

      Result

      Result	Proceed to
      TOYOTA parking assist-sensor system malfunction	A
      TOYOTA parking assist-sensor system normal operation	B

   
   

   B

   END (NO. 1 ULTRASONIC SENSOR LH IS DEFECTIVE)

   A

8. REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)

   
   

   1. Replace the No. 1 ultrasonic sensor (rear sensor RH) Click here.

   
   

   NEXT

9. CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM

   
   

   1. Check the operation of the TOYOTA parking assist-sensor system Click here.

      Result

      Result	Proceed to
      TOYOTA parking assist-sensor system malfunction	A
      TOYOTA parking assist-sensor system normal operation	B

   
   

   NG

   END (NO. 1 ULTRASONIC SENSOR RH IS DEFECTIVE)

   OK

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