TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback), Diagnostic DTC:C1AE7

DTC Code DTC Name
C1AE7 Rear Left Center Sensor Malfunction

DESCRIPTION

The No. 3 ultrasonic sensor (rear center LH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 3 ultrasonic sensor (rear center LH). If the No. 3 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 No. 3 ultrasonic sensor (rear center LH).

  • A short or open in the harness or connector

  • No. 3 ultrasonic sensor (rear center LH)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A01KR01E61
*a Clearance Warning ECU Assembly
*b No. 3 Ultrasonic Sensor (Rear Center LH)

CAUTION / NOTICE / HINT

Note


  • If DTCs are output after repairs, turn the power switch on (IG) and the TOYOTA parking assist-sensor system 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. 3 ULTRASONIC SENSOR (REAR CENTER LH))


    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the R7 No. 3 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) - R7-1 (EI) Always Below 1 Ω
      E98-4 (BOR) - R7-3 (BI) Always Below 1 Ω
      E98-20 (S4) - R7-2 (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 NO. 3 ULTRASONIC SENSOR (REAR CENTER LH)


    1. Replace the No. 3 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
      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