DYNAMIC RADAR CRUISE CONTROL 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 objects in front of the vehicle.

When it is determined that the vehicle is being driven in a straight line or on a gradual curve based on signals from the yaw rate sensor, the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis has deviated. When the millimeter wave radar sensor assembly beam axis is misaligned, the driving support ECU assembly 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. Detection Item DTC Detection Condition Trouble Area
C1A11 Front Radar Sensor Incorrect Axial Gap When the vehicle is being driven at a speed of 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.3 seconds or more.
  • 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 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, incompletion of the millimeter wave radar sensor assembly beam axis alignment is detected for approximately 0.3 seconds or more.
  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


  • 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.

  • 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.

    Click here

  • If only history DTCs are stored, they may have been stored due to a temporary condition such as overloading of the vehicle.

PROCEDURE


  1. CHECK FOR DTCs

    Tech Tips

    If only history DTCs are stored, they may have been stored due to a temporary condition such as overloading of the vehicle.


    1. Check if the stored DTCs are current DTCs.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    5. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      Current DTC C1A11 is output A
      Current DTC C1A14 is output B
      History DTC C1A11 is output C

    B
    C
    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
    A
  3. CHECK WHEEL ALIGNMENT


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

      for front wheel alignment: Click here

      for rear wheel alignment: 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
    A
  4. ADJUST WHEEL ALIGNMENT


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

      for front wheel alignment: Click here

      for rear wheel alignment: Click here

      Result
      Proceed to
      NEXT

    NEXT
  5. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  6. CHECK FOR DTCs


    1. Clear the DTCs.


      Powertrain > Radar Cruise > Clear DTCs
    2. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Turn the engine switch on (IG).

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

      3. Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

    3. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC C1A11 is not output A
      DTC C1A11 is output B

    A
    B
  7. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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

      Click here

      Tech Tips

      If the bracket is deformed, replace the millimeter wave radar sensor assembly with a new one.

      Result
      Result Proceed to
      Bracket is not deformed A
      Bracket is deformed B

    B
    A
  8. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  9. CHECK FOR DTCs


    1. Clear the DTCs.


      Powertrain > Radar Cruise > Clear DTCs
    2. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Turn the engine switch on (IG).

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

      3. Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

    3. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC C1A11 is not output A
      DTC C1A11 is output B

    A
    B
  10. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Return the vehicle to normal operating conditions.

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

    3. Clear the DTCs.


      Powertrain > Radar Cruise > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT
  11. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  12. CHECK FOR DTCs


    1. Clear the DTCs.


      Powertrain > Radar Cruise > Clear DTCs
    2. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Turn the engine switch on (IG).

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

      3. Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

    3. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC C1A14 is not output A
      DTC C1A14 is output B

    A
    B
  13. CLEAR DTC


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

    2. Clear the DTCs.


      Powertrain > Radar Cruise > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT