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 power switch is turned on (IG).

  • Front ultrasonic sensor circuit

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

B004POGE33

PROCEDURE


  1. INTELLIGENT CLEARANCE SONAR SYSTEM REGISTRATION


    1. Perform intelligent clearance sonar system registration.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC


    1. Using the GTS, check for DTCs according to the prompts on the screen.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

  3. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK DTC OUTPUT (C1AEC)


    1. Recheck for DTCs and check if the same DTC is output again.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      C1AEC is output A
      C1AEC is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

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


    1. Disconnect the F26 clearance warning ECU assembly connector.

    2. Disconnect the B1 front corner ultrasonic sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F26-4 (BOF) - B1-4 (BI) Always Below 1 Ω
      F26-8 (SOF) - B1-5 (SI) Always Below 1 Ω
      F26-6 (E5) - B1-6 (EI) Always Below 1 Ω
      F26-4 (BOF) or B1-4 (BI) - Body ground Always 10 kΩ or higher
      F26-8 (SOF) or B1-5 (SI) - Body ground Always 10 kΩ or higher
      F26-6 (E5) or B1-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT CORNER ULTRASONIC SENSOR LH - FRONT CENTER ULTRASONIC SENSOR LH)


    1. Disconnect the B2 front center ultrasonic sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B1-1 (BO) - B2-4 (BI) Always Below 1 Ω
      B1-2 (SO) - B2-5 (SI) Always Below 1 Ω
      B1-3 (EO) - B2-6 (EI) Always Below 1 Ω
      B1-1 (BO) or B2-4 (BI) - Body ground Always 10 kΩ or higher
      B1-2 (SO) or B2-5 (SI) - Body ground Always 10 kΩ or higher
      B1-3 (EO) or B2-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR LH - FRONT CENTER ULTRASONIC SENSOR RH)


    1. Disconnect the B3 front center ultrasonic sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B2-1 (BO) - B3-4 (BI) Always Below 1 Ω
      B2-2 (SO) - B3-5 (SI) Always Below 1 Ω
      B2-3 (EO) - B3-6 (EI) Always Below 1 Ω
      B2-1 (BO) or B3-4 (BI) - Body ground Always 10 kΩ or higher
      B2-2 (SO) or B3-5 (SI) - Body ground Always 10 kΩ or higher
      B2-3 (EO) or B3-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (FRONT CENTER ULTRASONIC SENSOR RH - FRONT CORNER ULTRASONIC SENSOR RH)


    1. Disconnect the B4 front corner ultrasonic sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B3-1 (BO) - B4-4 (BI) Always Below 1 Ω
      B3-2 (SO) - B4-5 (SI) Always Below 1 Ω
      B3-3 (EO) - B4-6 (EI) Always Below 1 Ω
      B3-1 (BO) or B4-4 (BI) - Body ground Always 10 kΩ or higher
      B3-2 (SO) or B4-5 (SI) - Body ground Always 10 kΩ or higher
      B3-3 (EO) or B4-6 (EI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT FRONT CORNER ULTRASONIC SENSOR LH


    1. B004PKEC38
      *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
      B1-4 (BI) - B1-6 (EI) Always 10 kΩ or higher
      B1-4 (BI) - B1-1 (BO) Always Below 1 Ω
      B1-5 (SI) - B1-2 (SO) Always Below 30 Ω
      B1-6 (EI) - B1-3 (EO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CORNER ULTRASONIC SENSOR LH Click here

    OK

  10. INSPECT FRONT CENTER ULTRASONIC SENSOR LH


    1. B004PKEC39
      *a

      Component without harness connected

      (Front Center Ultrasonic Sensor LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B2-4 (BI) - B2-6 (EI) Always 10 kΩ or higher
      B2-4 (BI) - B2-1 (BO) Always Below 1 Ω
      B2-5 (SI) - B2-2 (SO) Always Below 30 Ω
      B2-6 (EI) - B2-3 (EO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CENTER ULTRASONIC SENSOR LH Click here

    OK

  11. INSPECT FRONT CENTER ULTRASONIC SENSOR RH


    1. B004PKEC40
      *a

      Component without harness connected

      (Front Center Ultrasonic Sensor RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B3-4 (BI) - B3-6 (EI) Always 10 kΩ or higher
      B3-4 (BI) - B3-1 (BO) Always Below 1 Ω
      B3-5 (SI) - B3-2 (SO) Always Below 30 Ω
      B3-6 (EI) - B3-3 (EO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CENTER ULTRASONIC SENSOR RH Click here

    OK

  12. INSPECT FRONT CORNER ULTRASONIC SENSOR RH


    1. B004PKEC36
      *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
      B4-4(BI) - B4-6(EI) Always 10 kΩ or higher
      B4-4(BI) - B4 -1(BO) Always Below 1 Ω
      B4-5(SI) - B4 -2(SO) Always Below 30 Ω
      B4-6(EI) - B4 -3(EO) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT CORNER ULTRASONIC SENSOR RH Click here

    OK

  13. REPLACE FRONT CORNER ULTRASONIC SENSOR LH

    Tech Tips

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  14. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  15. CHECK DTC OUTPUT (C1AEC)


    1. Recheck for DTCs and check if the same DTC is output again.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      C1AEC is output A
      C1AEC is not output B

    B

    END (FRONT CORNER ULTRASONIC SENSOR LH WAS DEFECTIVE)

    A

  16. REPLACE FRONT CENTER ULTRASONIC SENSOR LH

    Tech Tips

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  17. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  18. CHECK DTC OUTPUT (C1AEC)


    1. Recheck for DTCs and check if the same DTC is output again.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      C1AEC is output A
      C1AEC is not output B

    B

    END (FRONT CENTER ULTRASONIC SENSOR LH WAS DEFECTIVE)

    A

  19. REPLACE FRONT CENTER ULTRASONIC SENSOR RH

    Tech Tips

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  20. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  21. CHECK DTC OUTPUT (C1AEC)


    1. Recheck for DTCs and check if the same DTC is output again.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      C1AEC is output A
      C1AEC is not output B

    B

    END (FRONT CENTER ULTRASONIC SENSOR RH WAS DEFECTIVE)

    A

  22. REPLACE FRONT CORNER ULTRASONIC SENSOR RH

    Tech Tips

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  23. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  24. CHECK DTC OUTPUT (C1AEC)


    1. Check for DTCs.


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      C1AEC is output A
      C1AEC is not output B

    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    B

    END (FRONT CORNER ULTRASONIC SENSOR RH WAS DEFECTIVE)