PRE-COLLISION SYSTEM, Diagnostic DTC:C1AAA

DTC Code DTC Name
C1AAA FCM Destination Information Uninitialized

DESCRIPTION

When a new pre-collision city sensor is installed, it receives and stores vehicle destination information from the main body ECU (multiplex network body ECU). If the pre-collision 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.

DTC Detection Condition

Trouble Area

C1AAA

  • All of the following conditions are met:

    • The battery voltage is 10 V or more.

    • The vehicle is being driven at 50 km/h (32 mph) or more.

    • Destination information has not been stored in the pre-collision city sensor.

  • Main body ECU (multiplex network body ECU)

  • Pre-collision city sensor

CAUTION / NOTICE / HINT

Note:

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

  • If the pre-collision city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Pre-collision City Sensor Learning (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. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / PCS/LDA/RSA/LVN / Trouble Codes.

    5. Clear the DTCs (Click here).

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

      Tip:

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

    7. Check for DTCs (Click here).

    Table 1. Result

    Result

    Proceed to

    DTC C1AAA is not output

    A

    DTC C1AAA is output

    B

    USE SIMULATION METHOD TO CHECK

    (Click here)

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

    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.

  3. CHECK FOR DTCS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / PCS/LDA/RSA/LVN / Trouble Codes.

    5. Clear the DTCs (Click here).

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

      Tip:

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

    7. Check for DTCs (Click here).

    Table 2. Result

    Result

    Proceed to

    DTC C1AAA is not output

    A

    DTC C1AAA is output

    B

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

    REPLACE PRE-COLLISION CITY SENSOR

    (Click hereClick here)