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, it stores destination information received from the main body ECU (multiplex network body ECU). If the destination information stored in the forward recognition camera is different from that stored in the main body ECU (multiplex network body ECU), DTC C1AA1 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AA1 FCM Destination Information Unmatched While the initial check is running, the ignition switch is ON and the road sign assist system is operating, destination information in the forward recognition camera and main body ECU (multiplex network body ECU) do not match for 5 second or more.

  • CAN communication system

  • Forward recognition camera

  • Main body ECU (Multiplex network body ECU)

CAUTION / NOTICE / HINT

Note


  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

  • If the main body ECU (multiplex network body ECU) is replaced, 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 Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

    Click here

Tech Tips

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

PROCEDURE


  1. CHECK FOR DTCs (CAN COMMUNICATION DTC OUTPUT)


    1. Check for DTCs.

      Click here


      Body Electrical > Road Sign Assist > Trouble Codes
      Result
      Result Proceed to
      DTC U0142 is not output A
      DTC U0142 is output B

    B

    GO TO CAN COMMUNICATION SYSTEM for LHD with Central Gateway ECU: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD with Central Gateway ECU: Click here

    A

  2. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Make sure that the following conditions are met.

      Tech Tips

      If the conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      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

  3. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Adjust the forward recognition camera.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Road Sign Assist > Clear DTCs

    2. Make sure that the following conditions are met.

      Tech Tips

      If the conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      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) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here