DTC    C1A11    Front Radar Sensor Incorrect Axial Gap

DTC    C1A14    Front Radar Sensor Beam Axis Not Adjusted

for Preparation Click here


DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.
When the vehicle is determined to be driving in a straight line or on a slow 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 the 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 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
  1. Millimeter wave radar sensor assembly
  2. Driving support ECU assembly
C1A14
Driving at 10 km/h (6 mph) or more while front millimeter wave radar sensor axis adjustment has not been performed
  1. Millimeter wave radar sensor assembly
  2. Driving support ECU assembly

INSPECTION PROCEDURE

1.ADJUST FRONT MILLIMETER WAVE RADAR SENSOR

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


NEXT


2.CHECK WHETHER DTC OUTPUT RECURS (C1A11 OR C1A14)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

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

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

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

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

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the 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

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