TOYOTA PARKING ASSIST-SENSOR SYSTEM Rear Clearance Sonar Sensor LH Circuit

DESCRIPTION

The ultrasonic sensor sends and receives ultrasonic waves. Based on the received wave, the sensor calculates the approximate distance between the vehicle and the obstacle.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (REAR LEFT CORNER SENSOR - CLEARANCE WARNING ECU ASSEMBLY)

   
   

   1. Disconnect the f4 connector from the No. 1 ultrasonic sensor (rear left corner sensor).

   2. Disconnect the E104 connector from the clearance warning ECU assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition f4-3 (T) - E104-12 (BOR) Always Below 1 Ω f4-2 (S) - E104-3 (S4) Always Below 1 Ω f4-1 (E) - E104-11 (E2) Always Below 1 Ω f4-3 (T) - Body ground Always 10 kΩ or higher f4-2 (S) - Body ground Always 10 kΩ or higher f4-1 (E) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

2. REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CORNER SENSOR)

   
   

   1. Replace the No. 1 ultrasonic sensor with a new or known good one Click here.

   
   

   NEXT

3. CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM

   
   

   1. Check the operation of the Toyota parking assist-sensor system.

      Tech Tips

      Refer to Operation Check (Initial Check) Click here.

      Result
      Result Proceed to Toyota parking assist-sensor system is malfunctioning A Toyota parking assist-sensor system is normal B

   
   

   B

   END (REAR LEFT CORNER SENSOR WAS DEFECTIVE)

   A

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