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 uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on this information, the driving support ECU sends pre-crash 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 a self-diagnosis to check if the sensor beam axis is deviated from the direction that the vehicle is moving. When the beam axis of millimeter wave radar sensor assembly is deviated, the driving support ECU detects this, and stores DTC C1A11

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

DTC Code DTC Detection Condition Trouble Area
C1A11 With the ignition switch ON and the millimeter wave radar sensor assembly performing self-diagnosis, axis deviation is detected for 1 second (sensor self-diagnosis operates when the vehicle is driven at approximately 50 km/h [31 mph] for a total of 10 hours).

  • Millimeter wave radar sensor assembly

  • Driving support ECU
C1A14 The vehicle is driven at 10 km/h (6 mph) or more while axis adjustment of the millimeter wave radar sensor assembly has not been performed for 1 second.

  • Millimeter wave radar sensor assembly

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Check the millimeter wave radar sensor assembly installation Click here.


    NEXT

  2. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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


    NEXT

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1A11 or C1A14 is not output.

    NG

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    OK

    END

  4. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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


    NEXT

  5. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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


    NEXT

  6. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1A11 or C1A14 is not output.

      Tech Tips

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


    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY IS DEFECTIVE)