TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback), Diagnostic DTC:C1AED

DTC Code DTC Name
C1AED Rear Sensor Communication Malfunction

DESCRIPTION

This DTC is stored when there is a short circuit in the communication line between the rear sensors and the ECU, or when there is a malfunction in a rear sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AED Rear Sensor Communication Malfunction A short circuit in the communication line between the rear sensors and ECU or a malfunction in a rear sensor during initialization mode after the power switch is turned on (IG).

  • No. 1 ultrasonic sensor (rear corner LH or rear corner RH)

  • No. 3 ultrasonic sensor (rear center LH or rear center RH)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A01KRZ3E09

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 - ULTRASONIC SENSOR (REAR SONARS))


    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the R8 No. 1 ultrasonic sensor (rear corner LH) connector.

    3. Disconnect the R7 No. 3 ultrasonic sensor (rear center LH) connector.

    4. Disconnect the R6 No. 3 ultrasonic sensor (rear center RH) connector.

    5. Disconnect the R5 No. 1 ultrasonic sensor (rear corner RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E98-4 (BOR) - Body ground Always 10 kΩ or higher
      E98-4 (BOR) - E98-1 (E1) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT NO. 1 ULTRASONIC SENSOR (REAR CORNER LH)


    1. Remove the No. 1 ultrasonic sensor (rear corner LH).

      Click here

    2. A01KSXGC01
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Corner LH))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (BI) - 1 (EI) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER LH) Click here

    OK

  3. INSPECT NO. 3 ULTRASONIC SENSOR (REAR CENTER LH)


    1. Remove the No. 3 ultrasonic sensor (rear center LH).

      Click here

    2. A01KSXGC01
      *a

      Component without harness connected

      (No. 3 Ultrasonic Sensor (Rear Center LH))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (BI) - 1 (EI) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 3 ULTRASONIC SENSOR (REAR CENTER LH) Click here

    OK

  4. INSPECT NO. 3 ULTRASONIC SENSOR (REAR CENTER RH)


    1. Remove the No. 3 ultrasonic sensor (rear center RH).

      Click here

    2. A01KSXGC01
      *a

      Component without harness connected

      (No. 3 Ultrasonic Sensor (Rear Center RH))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (BI) - 1 (EI) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 3 ULTRASONIC SENSOR (REAR CENTER RH) Click here

    OK

  5. INSPECT NO. 1 ULTRASONIC SENSOR (REAR CORNER RH)


    1. Remove the No. 1 ultrasonic sensor (rear corner RH).

      Click here

    2. A01KSXGC01
      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Rear Corner RH))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (BI) - 1 (EI) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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