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 (instrument panel junction block assembly). If the pre-crash safety city sensor cannot receive vehicle destination information from the main body ECU (instrument panel junction block assembly) and vehicle information is not stored, DTC C1AAA is output.

DTC Code DTC Detection Condition Trouble Area
C1AAA When the ignition switch is ON and the system is operating, vehicle information in the pre-crash safety city sensor is unconfirmed.

  • Main body ECU (instrument panel junction block assembly)

  • Pre-crash safety city sensor

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (instrument panel junction block assembly) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure.

  • When replacing the pre-crash safety city sensor, replace it with a new one. If an ECU 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 output.

  • When replacing the pre-crash safety city sensor with a new one, or performing removal, installation or replacement of the windshield glass, always perform "Recognition Camera/ Target Position Memory" and "Beam Axis Learning".

    Perform adjustment with either "ONE TIME RECOGNITION" or "SEQUENTIAL RECOGNITION".


  • 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 to troubleshooting Click here.

PROCEDURE


  1. CHECK FOR DTCs


    1. Clear the DTCs Click here.

    2. Turn the ignition switch to ON and wait for approximately 1 minute.

    3. Check for DTCs Click here.

      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 (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Replace the main body ECU (instrument panel junction block assembly) with a new one.

      Note

      If the main body ECU (instrument panel junction block assembly) is replaced, refer to the Service Bulletin.


    NEXT

  3. CHECK FOR DTCs


    1. Clear the DTCs Click here.

    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.

      Result
      Result Proceed to
      DTC C1AAA is not output A
      DTC C1AAA is output B

    A

    END (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] WAS DEFECTIVE)

    B

    REPLACE PRE-CRASH SAFETY CITY SENSOR Click here