PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A11, C1A14

DTC Code DTC Name
C1A11 Front Radar Sensor Incorrect Axial Gap
C1A14 Front Radar Sensor Beam Axis Not Adjusted

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-crash safety control operation signals.

When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the millimeter wave radar sensor assembly performs self diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the millimeter wave radar sensor assembly beam axis has deviated, the driving support ECU assembly detects this, and stores DTC C1A11.

After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.

DTC No. DTC Detection Condition Trouble Area
C1A11 When the engine switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly
C1A14 When the vehicle is being driven at a speed of 10 km/h (6 mph) or more, misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.

  • 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.

PROCEDURE


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


    1. Check if the stored DTCs are current DTCs.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. Check for DTCs Click here.

      Result
      Result Proceed to
      Current DTC C1A11 is output A
      Current DTC C1A14 is output B
      History DTC C1A11 is output C

    B

    PERFORM MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS ADJUSTMENT) Click here

    C

    CLEAR DTC Click here

    A

  2. CHECK VEHICLE CONDITION


    1. Check the operating conditions of the vehicle.

      Tech Tips

      DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is temporarily misaligned due to the vehicle being overloaded.

      Result
      Result Proceed to
      Vehicle is not overloaded or being towed. A
      Vehicle is overloaded or being towed. B

    B

    PERFORM MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS ADJUSTMENT) Click here

    A

  3. CHECK WHEEL ALIGNMENT


    1. Check the front and rear wheel alignment (toe) (See page , Click here).

      Tech Tips

      DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is misaligned due to incorrect wheel alignment (toe).

      Result
      Result Proceed to
      Front or rear wheel is misaligned (toe) A
      Front and rear wheels are not misaligned (toe) B

    B

    PERFORM MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS ADJUSTMENT) Click here

    A

  4. ADJUST WHEEL ALIGNMENT


    1. Adjust the alignment (toe) of the wheels (See page , Click here).


    NEXT

    PERFORM MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS ADJUSTMENT) Click here

  5. PERFORM MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS ADJUSTMENT)


    1. Check that the bracket of the millimeter wave radar sensor assembly is not deformed Click here.

    2. Perform millimeter wave radar sensor assembly adjustment Click here.


    NEXT

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

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

      Tech Tips

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

    7. Check for DTCs Click here.

      Tech Tips

      After performing the radar sensor beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the driving support ECU assembly.

      Result
      Result Proceed to
      DTC C1A11 or C1A14 is output A
      DTC C1A11 and C1A14 are not output B

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    B

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

  7. CLEAR DTC


    1. Check for DTCs related to misalignment of millimeter wave radar sensor assembly.

      Tech Tips

      If only history DTCs are stored, they may have stored due to a temporarily condition such as overloading of the vehicle, and the system returned to normal when beam axis learning was performed.

    2. Clear the DTCs Click here.


    NEXT

    END

  8. PERFORM MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS ADJUSTMENT)


    1. Return the vehicle to normal operating conditions.

    2. Perform millimeter wave radar sensor assembly adjustment Click here.

    3. Clear the DTCs Click here.


    NEXT

    END