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 obstacles in front of the vehicle.

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, the millimeter wave radar sensor assembly performs self diagnosis to check if the sensor beam axis is deviated from the vehicle movement direction. When the millimeter wave radar sensor assembly beam axis is not adjusted correctly, the driving support ECU assembly detects this, and DTC C1A11 is stored.

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 While power switch is on (IG) and dynamic radar cruise control system is operating and after driving at approximately 50 km/h (31 mph) for 10 hours, driving support ECU assembly determines that aim of front millimeter wave radar sensor beam axis is not adjusted correctly

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly
C1A14 While power switch is on (IG) and dynamic radar cruise control system is operating, driving at 10 km/h (6 mph) or more while power switch is on (IG) and front millimeter wave radar sensor axis adjustment has not been performed

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Adjust the front millimeter wave radar sensor Click here.


    NEXT

  2. CHECK FOR DTCs (C1A11 OR C1A14)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which radar cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

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

    6. Check for DTCs.

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

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    A

    END

  3. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly Click here.


    NEXT

  4. CHECK FOR DTCs (C1A11 OR C1A14)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which radar cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

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

    6. Check for DTCs.

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

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    A

    END