DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A11 and 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 and acceleration 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

  • No. 1 millimeter wave radar sensor bracket

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 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:

  • When replacing the driving support ECU assembly, make sure to replace it with a new one. If a device 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, and 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.

PROCEDURE

  1. CHECK FOR DTCs

    1. Check if the stored DTCs are current DTCs.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Enter the following menus: Body Electrical / Radar Cruise 2 / Trouble Codes.

    5. Check for DTCs.

      Click here

      Powertrain > Radar Cruise2 > 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

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

    C

    CLEAR DTCClick here

    A

  2. CHECK VEHICLE CONDITION

    1. Check the operating conditions of the vehicle.

      Tip:

      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

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

    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

      Tip:

      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

    CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

    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.

      Click here

      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tip:

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

      1. Turn the power switch on (IG).

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

      3. Drive the vehicle at 36 km/h (22 mph) or more for 0.3 seconds or more.

    3. Check for DTCs.

      Click here

      Powertrain > Radar Cruise2 > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1A11 is not output

    A

    DTC C1A11 is output

    B
    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

  7. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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

      Click here

    Result

    Result

    Proceed to

    Bracket is not deformed

    A

    No. 1 millimeter wave radar sensor bracket is deformed

    B

    The other bracket than No. 1 millimeter wave radar sensor bracket is deformed

    C
    A

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

    B

    REPLACE NO. 1 MILLIMETER WAVE RADAR SENSOR BRACKETClick here

    C

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

  8. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    1. Replace the millimeter wave radar sensor assembly with a new one.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  9. CHECK FOR DTCs

    1. Clear the DTCs.

      Click here

      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tip:

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

      1. Turn the power switch on (IG).

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

      3. Drive the vehicle at 36 km/h (22 mph) or more for 0.3 seconds or more.

    3. Check for DTCs.

      Click here

      Powertrain > Radar Cruise2 > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1A11 is not output

    A

    DTC C1A11 is output

    B
    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY

  10. REPLACE NO. 1 MILLIMETER WAVE RADAR SENSOR BRACKET

    1. Replace the No. 1 millimeter wave radar sensor bracket with a new one.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

    3. Clear the DTCs.

      Click here

      Powertrain > Radar Cruise2 > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

    END (NO. 1 MILLIMETER WAVE RADAR SENSOR BRACKET WAS DEFECTIVE)

  11. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    Tip:

    When the vehicle is overloaded or towing something, it may not be possible to perform beam axis adjustment of the millimeter wave radar sensor assembly (this is not a malfunction of the 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.

      Click here

      Powertrain > Radar Cruise2 > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

    END

    Tip:

    After clearing the DTCs, instruct the user not to use the radar cruise control system when the vehicle is overloaded or towing something.

  12. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  13. CHECK FOR DTCs

    1. Clear the DTCs.

      Click here

      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tip:

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

      1. Turn the power 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 0.3 seconds or more.

    3. Check for DTCs.

      Click here

      Powertrain > Radar Cruise2 > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1A14 is not output

    A

    DTC C1A14 is output

    B
    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

  14. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    1. Replace the millimeter wave radar sensor assembly with a new one.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  15. CHECK FOR DTCs

    1. Clear the DTCs.

      Click here

      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tip:

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

      1. Turn the power switch on (IG).

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

      3. Drive the vehicle at 36 km/h (22 mph) or more for 0.3 seconds or more.

    3. Check for DTCs.

      Click here

      Powertrain > Radar Cruise2 > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1A14 is not output

    A

    DTC C1A14 is output

    B
    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY

  16. CLEAR DTC

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

      Tip:

      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

      Powertrain > Radar Cruise2 > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

    END