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PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A11, C1A14

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DTC Code DTC Name
C1A11 Front Radar Sensor Incorrect Axial Gap
C1A14 Front Radar Sensor Beam Axis Not Adjusted
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DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly sends pre-crash safety 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 from the vehicle movement direction. When 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 is not performed, DTC C1A14 is stored.

DTC No. DTC Detection Condition Trouble Area
C1A11 When the power switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 1 second.

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly
C1A14 When the vehicle is being driven at a speed of 10 km/h (6 mph) or more, misalignment of the millimeter wave radar sensor assembly is detected for approximately 1 second.

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly
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CAUTION / NOTICE / HINT

Note:

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).

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PROCEDURE


  1. Click here

    ADJUST MILLIMETER WAVE RADAR SENSOR


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

    2. Adjust the millimeter wave radar sensor assembly (Click here).


  2. Click here

    CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs (Click here).

    6. Drive the vehicle and attempt to reproduce the conditions present when the DTC was detected.

    7. Recheck for DTCs.

      OK
      DTC C1A11 or C1A14 is not output.
      Tip:

      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.


    • OK

      END

    • NG

      REPLACE DRIVING SUPPORT ECU ASSEMBLY (Click here)