DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A0A

DTC Code DTC Name
C1A0A Front Radar Sensor Region Code Mismatch

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly sends dynamic radar cruise control operation signals.

When the millimeter wave radar sensor assembly is replaced with a new one, it acquires the country specification information from the driving support ECU assembly. Also, when the driving support ECU assembly is replaced with a new one, it receives country specification information from the main body ECU (multiplex network body ECU). When country specification information in the millimeter wave radar sensor assembly, driving support ECU and/or main body ECU do not match, DTC C1A0A is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A0A Front Radar Sensor Region Code Mismatch When the ignition switch is turned ON and the dynamic radar cruise control system is operating, the destination information in the driving support ECU assembly and millimeter wave radar sensor assembly do not match for approximately 1.4 seconds or more.

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


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

  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    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.

    for LHD with Central Gateway ECU: Click here

    for RHD with Central Gateway ECU: Click here

PROCEDURE


  1. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tech Tips

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


      1. Turn the ignition switch to ON.

      2. Turn the dynamic radar cruise control system on using the cruise control switch (ON/OFF).

      3. Wait for 1.4 seconds or more.

    5. Enter the following menus: Powertrain / Radar Cruise2 / Trouble Codes.

    6. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A0A is output A
      DTC C1A0A is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly with a new one.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tech Tips

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


      1. Turn the ignition switch to ON.

      2. Turn the dynamic radar cruise control system on using the cruise control switch (ON/OFF).

      3. Wait for 2 seconds or more.

    5. Enter the following menus: Powertrain / Radar Cruise2 / Trouble Codes.

    6. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A0A is output A
      DTC C1A0A is not output B

    A

    Replace the driving support ECU assembly. for LHD: Click here
    for RHD: Click here

    B

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)