TOYOTA PARKING ASSIST-SENSOR SYSTEM, Diagnostic DTC:C1AEC

DTC Code DTC Name
C1AEC Front Sensor Communication Malfunction

DESCRIPTION

This DTC is stored when there is an open or 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 An open or short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the engine switch is turned on (IG).

  • Front ultrasonic sensor circuit

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

B006XGNE88
*a Front Corner Ultrasonic Sensor LH
*b Front Corner Ultrasonic Sensor RH
*c Clearance Warning ECU Assembly

PROCEDURE


  1. CLEARANCE SONAR SYSTEM REGISTRATION


    1. Perform clearance sonar system registration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT (C1AEC)


    1. Check for DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes

    2. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    3. Recheck for DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR RH)


    1. Disconnect the R39 clearance warning ECU assembly connector.

    2. Disconnect the B2 front corner ultrasonic sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R39-4 (BOF) - B2-1 (BI) Always Below 1 Ω
      R39-8 (SOF) - B2-3 (SI) Always Below 1 Ω
      R39-6 (E5) - B2-5 (EI) Always Below 1 Ω
      R39-4 (BOF) or B2-1 (BI) - Body ground Always 10 kΩ or higher
      R39-8 (SOF) or B2-3 (SI) - Body ground Always 10 kΩ or higher
      R39-6 (E5) or B2-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT CORNER ULTRASONIC SENSOR RH - FRONT CORNER ULTRASONIC SENSOR LH)


    1. Disconnect the B6 front corner ultrasonic sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B2-2 (BO) - B6-1 (BI) Always Below 1 Ω
      B2-4 (SO) - B6-3 (SI) Always Below 1 Ω
      B2-6 (EO) - B6-5 (EI) Always Below 1 Ω
      B2-2 (BO) or B6-1 (BI) - Body ground Always 10 kΩ or higher
      B2-4 (SO) or B6-3 (SI) - Body ground Always 10 kΩ or higher
      B2-6 (EO) or B6-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT ULTRASONIC SENSOR FRONT CORNER


    1. B006Z2AC01
      *a

      Component without harness connected

      (Front Corner Ultrasonic Sensor RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (BI) - 5 (EI) Always 10 kΩ or higher
      1 (BI) - 2 (BO) Always Below 1 Ω
      3 (SI) - 4 (SO) Always Below 30 Ω
      5 (EI) - 6 (EO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CORNER ULTRASONIC SENSOR RH Click here

    OK

  6. INSPECT FRONT CORNER ULTRASONIC SENSOR LH


    1. B006Z2AC04
      *a

      Component without harness connected

      (Front Corner Ultrasonic Sensor LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (BI) - 5 (EI) Always 10 kΩ or higher
      1 (BI) - 1 (BO) Always Below 1 Ω
      3 (SI) - 2 Always Below 30 Ω
      5 (EI) - 3 (EO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CORNER ULTRASONIC SENSOR LH Click here

    OK

  7. REPLACE FRONT CORNER ULTRASONIC SENSOR LH

    Result
    Proceed to
    NEXT

    1. Replace the front corner ultrasonic sensor LH with a known good one.

      Click here

      Tech Tips

      All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK DTC OUTPUT (C1AEC)


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    B

    END (FRONT CORNER ULTRASONIC SENSOR LH WAS DEFECTIVE)

    A

  9. REPLACE FRONT CORNER ULTRASONIC SENSOR RH

    Result
    Proceed to
    NEXT

    1. Replace the front corner ultrasonic sensor RH with a known good one.

      Click here

      Tech Tips

      All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK DTC OUTPUT (C1AEC)


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      DTC C1AEC is output A
      No DTCs are output B

    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    B

    END (Front Corner Ultrasonic Sensor LH WAS DEFECTIVE)