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 signals from the millimeter wave radar sensor assembly, the driving support ECU assembly sends pre-crash safety system 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. If 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 has not been performed, DTC C1A14 will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A11 Front Radar Sensor Incorrect Axial Gap When the power 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 Front Radar Sensor Beam Axis Not Adjusted When the vehicle is being driven at a speed of 10 km/h (7 mph) or more, incompletion of the millimeter wave radar sensor beam axis alignment 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 replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor 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 FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      Current C1A11 is output A
      Current C1A14 is output B
      Current C1A11 and current C1A14 are not output C

    B

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    C

    CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM) 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 has been towed A
      Vehicle is overloaded or has been towed B

    B

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    A

  3. CHECK WHEEL ALIGNMENT


    1. Check the front and rear wheel alignment (toe).

      Tech Tips

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

      for Front: Click here

      for Rear: Click here

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

    B

    INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    A

  4. ADJUST WHEEL ALIGNMENT


    1. Adjust the alignment (toe) of the wheels.

      Tech Tips

      for Front: Click here

      for Rear: Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 0.2 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes

      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
      C1A11 is not output A
      C1A11 is output B

    A

    END

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

  8. INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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

      Tech Tips

      When the bracket is deformed, replace the millimeter wave radar sensor assembly.

      OK
      The bracket is not deformed.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 5 Click here

    NG

  9. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here

  10. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Return the vehicle to normal operating conditions.

    2. Perform millimeter wave radar sensor assembly adjustment.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

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


    1. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 0.2 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      C1A11 is not output A
      C1A11 is output B

    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS MISALIGNED DUE TO THE VEHICLE BEING OVERLOADED OR TOWED)

    B

    GO TO STEP 3 Click here

  13. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  14. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  15. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Drive the vehicle at a speed of 10 km/h (7 mph) or more for 0.2 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes

      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
      C1A14 is not output A
      C1A14 is output B

    A

    END (SENSOR BEAM AXIS ADJUSTMENT WAS NOT COMPLETED)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

  16. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Check the DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      History C1A11 is output A
      History C1A11 is not output B

    B

    END

    A

  17. CLEAR DTC (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

    END