TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Sedan), 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 ignition switch is turned to ON.

  • No. 1 ultrasonic sensor (rear corner LH, rear center LH, rear center RH or rear corner RH) (for Hatchback)

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

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

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

  1. for Hatchback

    E265134E08

  2. for Wagon

    E265134E10

CAUTION / NOTICE / HINT

Note:

  • If DTCs are output after repairs, turn the ignition switch to ON and turn 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. CONFIRM MODEL

    1. Choose the model to be inspected.

    Result

    Result

    Proceed to

    for Hatchback

    A

    for Wagon

    B
    B

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - ULTRASONIC SENSOR (REAR SONARS))Click here

    A

  2. 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. 1 ultrasonic sensor (rear center LH) connector.

    4. Disconnect the R6 No. 1 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

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

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

      Click here

    2. E270976C01

      *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

  4. INSPECT NO. 1 ULTRASONIC SENSOR (REAR CENTER LH)

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

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 1 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. 1 ULTRASONIC SENSOR (REAR CENTER LH)

    Click here

    OK

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

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

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 1 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. 1 ULTRASONIC SENSOR (REAR CENTER RH)

    Click here

    OK

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

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

      Click here

    2. E270976C01

      *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

    for RHD:Click here

    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER RH)

    Click here

  7. 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

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

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

      Click here

    2. E270976C01

      *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

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

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

      Click here

    2. E270976C01

      *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

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

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

      Click here

    2. E270976C01

      *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

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

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

      Click here

    2. E270976C01

      *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

    Result

    Proceed to

    OK

    A

    NG

    B
    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    B

    REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER RH)

    Click here