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 assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly 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 (airbag ECU assembly) etc., the millimeter wave radar sensor performs self diagnosis to check if the sensor beam axis is deviated from the vehicle movement direction. When the millimeter wave radar sensor beam axis is deviated, the driving support ECU assembly detects this, and stores DTC C1A11.

After installing a new millimeter wave radar sensor, 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 is detected for 1.3 seconds or more while the vehicle is being driven at a speed of 10 km/h (6 mph) or more.

  • Millimeter wave radar sensor

  • 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 is detected for 1 second or more.

  • Millimeter wave radar sensor

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. ADJUST MILLIMETER WAVE RADAR SENSOR


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

    2. Adjust the millimeter wave radar sensor Click here.


    NEXT

  2. CHECK DTC OUTPUT (PRE-CRASH 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:


      1. 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.

      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 assembly.


    OK

    END

    NG

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here