TOYOTA PARKING ASSIST-SENSOR SYSTEM(for Sedan without Simple Intelligent Parking Assist System), 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.

  • Ultrasonic sensor front center

  • Ultrasonic sensor front corner

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A01TCPKE04

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

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 r5 ultrasonic sensor front corner (LH) connector.

    3. Disconnect the r6 ultrasonic sensor front center (LH) connector.

    4. Disconnect the r3 ultrasonic sensor front center (RH) connector.

    5. Disconnect the r2 ultrasonic sensor front corner (RH) connector.

    6. 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 ULTRASONIC SENSOR FRONT CORNER (LH)


    1. Remove the ultrasonic sensor front corner (LH).

      Click here

    2. A01T9JOC01
      *a

      Component without harness connected

      (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 ULTRASONIC SENSOR FRONT CORNER (LH) Click here

    OK

  3. INSPECT ULTRASONIC SENSOR FRONT CENTER (LH)


    1. Remove the ultrasonic sensor front center (LH).

      Click here

    2. A01T9JOC01
      *a

      Component without harness connected

      (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 ULTRASONIC SENSOR FRONT CENTER (LH) Click here

    OK

  4. INSPECT ULTRASONIC SENSOR FRONT CENTER (RH)


    1. Remove the ultrasonic sensor front center (RH).

      Click here

    2. A01T9JOC01
      *a

      Component without harness connected

      (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 ULTRASONIC SENSOR FRONT CENTER (RH) Click here

    OK

  5. INSPECT ULTRASONIC SENSOR FRONT CORNER (RH)


    1. Remove the ultrasonic sensor front corner (RH).

      Click here

    2. A01T9JOC01
      *a

      Component without harness connected

      (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

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPLACE ULTRASONIC SENSOR FRONT CORNER (RH) Click here