PRE-COLLISION 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 pre-collision 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 assembly and/or main body ECU (multiplex network 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 power switch is on (IG), the country specification information from the driving support ECU assembly and millimeter wave radar sensor assembly do not match for approximately 2 seconds.

  • Millimeter wave radar sensor assembly

  • Main body ECU (multiplex network body ECU)

  • Driving support ECU assembly

INSPECTION PROCEDURE

Note


  • 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.

  • Check that the millimeter wave radar sensor assembly has not been replaced with one from another vehicle.

  • 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.

PROCEDURE


  1. READ VALUE USING TECHSTREAM (COUNTRY# (F RADAR SENS))


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Radar Cruise / Data List.

    5. Read the Data List according to the display on the Techstream.

      Radar Cruise
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Country# (F Radar Sens) Destination country for millimeter wave radar sensor assembly/JPN, NA, EURO, AUS, SAFC, OTHER, TWN, CHINA, THAI, GCC or NOFIXX Actual country code -

      Tech Tips

      The country specification information stored in the driving support ECU assembly is determined by the country specification information stored in the main body ECU (multiplex network body ECU). If the country specification information for the millimeter wave radar sensor assembly matches the vehicle, the country specification information for the main body ECU (multiplex network body ECU) and driving support ECU assembly is incorrect and the main body ECU (multiplex network body ECU) and driving support ECU assembly need to be replaced.


    NG

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    OK

  2. CHECK FOR DTC (PRE-COLLISION 2)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    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.

    5. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

    6. Check for DTCs.

      OK
      DTC C1A0A is not output

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND DRIVING SUPPORT ECU ASSEMBLY

    OK

    USE SIMULATION METHOD TO CHECK Click here