TOYOTA PARKING ASSIST-SENSOR SYSTEM(for Sedan without Simple Intelligent Parking Assist System), Diagnostic DTC:C1AE7

DTC Code DTC Name
C1AE7 Rear Left Center Sensor Malfunction

DESCRIPTION

The ultrasonic sensor rear center (LH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the ultrasonic sensor rear center (LH). If the ultrasonic sensor rear center (LH) has an open circuit or other malfunction, it will not function normally.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AE7 Rear Left Center Sensor Malfunction

  • A malfunction of the ultrasonic sensor rear center (LH).

  • A short or open in the harness or connector

  • Ultrasonic sensor rear center (LH)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A01TC5KE90
*a Clearance Warning ECU Assembly
*b Ultrasonic Sensor Rear Corner (LH)

CAUTION / NOTICE / HINT

Note

If DTCs are output after repairs, turn the ignition switch to ON and turn the back sonar or clearance sonar switch assembly on. Then clear the DTCs.

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - ULTRASONIC SENSOR REAR CENTER (LH))


    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the ultrasonic sensor rear center (LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E98-1 (E1) - R3-1 (EI) Always Below 1 Ω
      E98-4 (BOR) - R3-3 (BI) Always Below 1 Ω
      E98-20 (S4) - R3-2 (SI) Always Below 1 Ω
      E98-1 (E1) - E98-20 (S4) Always 10 kΩ or higher
      E98-4 (BOR) - E98-20 (S4) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE ULTRASONIC SENSOR REAR CENTER (LH)


    1. Replace the ultrasonic sensor rear center (LH) with a known good one.

      Click here

      Tech Tips

      All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs.


      Body Electrical > Clearance Sonar / Simple-IPA. > Clear DTCs

    2. Check for DTCs.


      Body Electrical > Clearance Sonar / Simple-IPA. > Trouble Codes
      OK
      No DTCs are output.
      Result
      Result Proceed to
      OK A
      NG B

    A

    END

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here