TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Sedan), 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. 2 ultrasonic sensor (front side LH or front side RH)

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

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

E265135E03

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. 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 r9 No. 1 ultrasonic sensor (front corner LH) connector.

    4. Disconnect the r10 No. 1 ultrasonic sensor (front center LH) connector.

    5. Disconnect the r8 No. 1 ultrasonic sensor (front center RH) connector.

    6. Disconnect the r7 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

    for LHD:Click here

    for RHD:Click here

    B

    REPLACE NO. 2 ULTRASONIC SENSOR (FRONT SIDE RH)

    Click here