TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback), Diagnostic DTC:C1AEC

DTC Code DTC Name
C1AEC Front Sensor Communication Malfunction

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AEC

Front Sensor Communication Malfunction

A short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the ignition switch is turned to ON.

  • No. 1 ultrasonic sensor (front side LH or front side RH) (for Wagon)

  • No. 2 ultrasonic sensor (front corner LH, front center LH, front center RH or front corner RH) (for Wagon)

  • No. 2 ultrasonic sensor (front side LH or front side RH) (for Sedan)

  • No. 1 ultrasonic sensor (front corner LH, front center LH, front center RH or front corner RH) (for Sedan)

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

E280748E04
E280748E03

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

  • 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 Wagon

    A

    for Sedan

    B
    B

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

    A

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - ULTRASONIC SENSOR (FRONT SONARS))

    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the r4 No. 1 ultrasonic sensor (front side LH) connector.

    3. Disconnect the r5 No. 2 ultrasonic sensor (front corner LH) connector.

    4. Disconnect the r6 No. 2 ultrasonic sensor (front center LH) connector.

    5. Disconnect the r3 No. 2 ultrasonic sensor (front center RH) connector.

    6. Disconnect the r2 No. 2 ultrasonic sensor (front corner RH) connector.

    7. Disconnect the r1 No. 1 ultrasonic sensor (front side RH) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E98-23 (BOF) - Body ground

      Always

      10 kΩ or higher

      E98-23 (BOF) - E98-27 (E5)

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT SIDE LH)

    1. Remove the No. 1 ultrasonic sensor (front side LH).

      Click here

    2. E270975C01

      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Front Side 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 (FRONT SIDE LH)

    Click here

    OK

  4. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT CORNER LH)

    1. Remove the No. 2 ultrasonic sensor (front corner LH).

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 2 Ultrasonic Sensor (Front 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. 2 ULTRASONIC SENSOR (FRONT CORNER LH)

    Click here

    OK

  5. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT CENTER LH)

    1. Remove the No. 2 ultrasonic sensor (front center LH).

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 2 Ultrasonic Sensor (Front 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. 2 ULTRASONIC SENSOR (FRONT CENTER LH)

    Click here

    OK

  6. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT CENTER RH)

    1. Remove the No. 2 ultrasonic sensor (front center RH).

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 2 Ultrasonic Sensor (Front 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. 2 ULTRASONIC SENSOR (FRONT CENTER RH)

    Click here

    OK

  7. INSPECT NO.2 ULTRASONIC SENSOR (FRONT CORNER RH)

    1. Remove the No. 2 ultrasonic sensor (front corner RH).

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 2 Ultrasonic Sensor (Front 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
    NG

    REPLACE NO.2 ULTRASONIC SENSOR (FRONT CORNER RH)

    Click here

    OK

  8. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT SIDE RH)

    1. Remove the No. 1 ultrasonic sensor (front side RH).

      Click here

    2. E270975C01

      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Front Side 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 (FRONT SIDE RH)

    Click here

  9. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - ULTRASONIC SENSOR (FRONT SONARS))

    1. Disconnect the E98 clearance warning ECU assembly connector.

    2. Disconnect the r4 No. 2 ultrasonic sensor (front side LH) connector.

    3. Disconnect the r5 No. 1 ultrasonic sensor (front corner LH) connector.

    4. Disconnect the r6 No. 1 ultrasonic sensor (front center LH) connector.

    5. Disconnect the r3 No. 1 ultrasonic sensor (front center RH) connector.

    6. Disconnect the r2 No. 1 ultrasonic sensor (front corner RH) connector.

    7. Disconnect the r1 No. 2 ultrasonic sensor (front side RH) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E98-23 (BOF) - Body ground

      Always

      10 kΩ or higher

      E98-23 (BOF) - E98-27 (E5)

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT SIDE LH)

    1. Remove the No. 2 ultrasonic sensor (front side LH).

      Click here

    2. E270975C01

      *a

      Component without harness connected

      (No. 2 Ultrasonic Sensor (Front Side 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. 2 ULTRASONIC SENSOR (FRONT SIDE LH)

    Click here

    OK

  11. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT CORNER LH)

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

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Front 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 (FRONT CORNER LH)

    Click here

    OK

  12. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT CENTER LH)

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

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Front 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 (FRONT CENTER LH)

    Click here

    OK

  13. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT CENTER RH)

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

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Front 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 (FRONT CENTER RH)

    Click here

    OK

  14. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT CORNER RH)

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

      Click here

    2. E270976C01

      *a

      Component without harness connected

      (No. 1 Ultrasonic Sensor (Front 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
    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (FRONT CORNER RH)

    Click here

    OK

  15. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT SIDE RH)

    1. Remove the No. 2 ultrasonic sensor (front side RH).

      Click here

    2. E270975C01

      *a

      Component without harness connected

      (No. 2 Ultrasonic Sensor (Front Side 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

    Click here

    B

    REPLACE NO. 2 ULTRASONIC SENSOR (FRONT SIDE RH)

    Click here