PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A0A

DTC Code DTC Name
C1A0A Front Radar Sensor Region Code Mismatch

DESCRIPTION

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

Based on this information, the driving support ECU sends pre-crash control operation signals.

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

DTC No. DTC Detection Condition Trouble Area
C1A0A When the power switch is on (IG), the country code of the driving support ECU and millimeter wave radar sensor do not match for approx. 1 second.

  • Millimeter wave radar sensor

  • Main body ECU

  • Driving support ECU

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK MILLIMETER WAVE RADAR SENSOR


    1. Using the intelligent tester, enter the following menus: Powertrain / Radar Cruise / Data List.

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

    2. Read the Data List and check the country specification information of the millimeter wave radar sensor and vehicle.

      Result
      Result Proceed to
      Country specification information for vehicle and millimeter wave radar sensor match A
      Country specification information for vehicle and millimeter wave radar sensor do not match (Japan←→Europe, Japan←→North America) B
      Country specification information for vehicle and millimeter wave radar sensor do not match (North America←→Europe) C

      Tech Tips


      • The country specification information of the driving support ECU is decided by the main body ECU. Even if the vehicle and sensor country specification information match, if the country specification information for the vehicle and ECU/main body ECU do not match, it is necessary to replace the ECU and meter.

      • When the country specification information (North America←→Europe) for the vehicle body and sensor do not match, the sensor information can be overwritten by performing the sensor axis adjustment.


    B

    REPLACE MILLIMETER WAVE RADAR SENSOR Click here

    C

    ADJUST MILLIMETER WAVE RADAR SENSOR Click here

    A

  2. REPLACE MAIN BODY ECU


    1. Replace the main body ECU Click here.


    NEXT

  3. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Using the intelligent tester, enter the following menus: Body / Pre-Crash 2 / DTC.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs.

      OK
      DTC C1A0A is not output.

    NG

    REPLACE DRIVING SUPPORT ECU ASSY Click here

    OK

    END