ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:C1AA1

DTC Code DTC Name
C1AA1 FCM Destination Information Unmatched

DESCRIPTION

When the forward recognition camera is replaced with a new one, the new forward recognition camera attempts to store vehicle information received from the main body ECU (multiplex network body ECU) and ECM. If the vehicle information stored in the forward recognition camera is different from that stored in the main body ECU (multiplex network body ECU) or ECM, DTC C1AA1 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AA1 FCM Destination Information Unmatched After the engine switch is turned on (IG) for 3 seconds or more, vehicle information stored in the forward recognition camera and that received from the main body ECU (multiplex network body ECU) or ECM do not match for 5 seconds or more.

  • CAN communication system

  • Forward recognition camera

  • Main body ECU (Multiplex network body ECU)

  • ECM

CAUTION / NOTICE / HINT

Note


  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    Click here

Tech Tips

This DTC is stored when the vehicle information stored in the forward recognition camera and that stored in the main body ECU (multiplex network body ECU) or ECM do not match. If the forward recognition camera, main body ECU (multiplex network body ECU) or ECM has been replaced, check if a forward recognition camera, main body ECU (multiplex network body ECU) or ECM from another vehicle was used.

PROCEDURE


  1. CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

    Tech Tips

    When DTC C1AA1 is stored, forward recognition camera system DTC C1AAC may be stored at the same time.


    1. Check for DTCs.


      Chassis > Front Recognition Camera > Trouble Codes
      Result
      Result Proceed to
      DTC C1AAC is not output A
      DTC C1AAC is output B

    B

    GO TO DTC CHART (C1AAC) Click here

    A

  2. CHECK FOR DTCs (CAN COMMUNICATION DTC OUTPUT)

    Tech Tips

    The forward recognition camera communicates with the main body ECU (multiplex network body ECU) via CAN communication. Confirm that the CAN communication system is functioning normally before proceeding.


    1. Check for DTCs.


      Chassis > Front Recognition Camera > Trouble Codes
      Result
      Result Proceed to
      DTC U0142 is not output A
      DTC U0142 is output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the engine switch on (IG) and wait 8 seconds or more.

    3. Check for DTCs.


      Body Electrical > Road Sign Assist > Trouble Codes
      Result
      Result Proceed to
      DTC C1AA1 is not output A
      DTC C1AA1 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  4. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Perform forward recognition camera adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the engine switch on (IG) and wait 8 seconds or more.

    3. Check for DTCs.


      Body Electrical > Road Sign Assist > Trouble Codes
      Result
      Result Proceed to
      DTC C1AA1 is not output A
      DTC C1AA1 is output B

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here