PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1AAA

DTC Code DTC Name
C1AAA FCM Destination Information Uninitialized

DESCRIPTION

When a new pre-crash safety city sensor is installed, it receives and stores vehicle destination information from the main body ECU (multiplex network body ECU). If the pre-crash safety city sensor cannot receive vehicle destination information from the main body ECU (multiplex network body ECU) and vehicle information is not stored, DTC C1AAA is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AAA FCM Destination Information Uninitialized When the power switch is on (IG) and the system is operating, vehicle information in the pre-crash safety city sensor is unconfirmed.

  • Main body ECU (multiplex network body ECU)

  • Pre-crash safety city sensor

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

  • When replacing the pre-crash safety city sensor, replace it with a new one and be sure to initialize the settings. If a pre-crash safety city sensor which was installed to another vehicle is used, the information stored in the pre-crash safety city sensor will not match the information from the vehicle and, as a result, a DTC may be stored.

  • If the pre-crash safety city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

    Click here

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCS


    1. Clear the DTCs.

      Click here


      Chassis > PCS/LDA/RSA/LVN > Clear DTCs

    2. Turn the power switch on (IG) and wait for approximately 1 minute.

    3. Check for DTCs.

      Click here


      Chassis > PCS/LDA/RSA/LVN > Trouble Codes
      Result
      Result Proceed to
      DTC C1AAA is not output A
      DTC C1AAA is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  2. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Replace the main body ECU (multiplex network body ECU) with a new one.

      for LHD: Click here

      for RHD: Click here

      Note

      If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCS


    1. Clear the DTCs.

      Click here


      Chassis > PCS/LDA/RSA/LVN > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Chassis > PCS/LDA/RSA/LVN > Trouble Codes
      Result
      Result Proceed to
      DTC C1AAA is not output A
      DTC C1AAA is output B

    A

    END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)

    B

    REPLACE PRE-CRASH SAFETY CITY SENSOR Click here