TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback), Diagnostic DTC:C1AE9

DTC Code DTC Name
C1AE9 Rear Right Sensor Malfunction

DESCRIPTION

The No. 4 ultrasonic sensor (rear corner RH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 4 ultrasonic sensor (rear corner RH). If the No. 4 ultrasonic sensor (rear corner RH) has an open circuit or other malfunction, it will not function normally.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AE9 Rear Right Sensor Malfunction

  • A malfunction of the No. 4 ultrasonic sensor (rear corner RH).

  • A short or open in the harness or connector

  • No. 4 ultrasonic sensor (rear corner RH)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A0139G3E50
*a Clearance Warning ECU Assembly
*b No. 4 Ultrasonic Sensor (Rear Corner RH)

CAUTION / NOTICE / HINT

Note


  • If DTCs are output after repairs, turn the power switch on (IG) and turn the back sonar or clearance sonar switch assembly on. Then clear the DTCs.

    Click here

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization may be needed. Refer to Initialization.

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 4 ULTRASONIC SENSOR (REAR CORNER RH))


    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the R1 No. 4 ultrasonic sensor (rear corner RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E98-1 (E1) - R1-1 (EI) Always Below 1 Ω
      E98-4 (BOR) - R1-3 (BI) Always Below 1 Ω
      E98-3 (S1) - R1-2 (SI) Always Below 1 Ω
      E98-1 (E1) - E98-3 (S1) Always 10 kΩ or higher
      E98-4 (BOR) - E98-3 (S1) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE NO. 4 ULTRASONIC SENSOR (REAR CORNER RH)


    1. Replace the No. 4 ultrasonic sensor (rear corner RH) 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
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE CLEARANCE WARNING ECU ASSEMBLY for LHD: Click here
    REPLACE CLEARANCE WARNING ECU ASSEMBLY for RHD: Click here