C1A14

PRE-COLLISION: PRE-COLLISION SYSTEM: C1A11,C1A14: 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 and lane recognition camera sensor assembly to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

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 etc., the millimeter wave radar sensor assembly performs a 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 detects this, and stores DTC C1A11.

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





INSPECTION PROCEDURE

NOTICE:
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed Adjustments.

PROCEDURE

1. ADJUST MILLIMETER WAVE RADAR SENSOR

(a) Check the millimeter wave radar sensor installation Installation.

(b) Adjust the millimeter wave radar sensor Adjustments.

NEXT -- Continue to next step.

2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM)

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

(b) Clear the DTCs Pre-Collision System.

(c) Drive the vehicle.

(d) Recheck for DTCs.

OK:

DTC C1A11 or C1A14 is not output.

HINT
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 MILLIMETER WAVE RADAR SENSOR

OK -- END

3. REPLACE MILLIMETER WAVE RADAR SENSOR

(a) Replace the millimeter wave radar sensor Removal.

NEXT -- Continue to next step.

4. ADJUST MILLIMETER WAVE RADAR SENSOR

(a) Adjust the millimeter wave radar sensor Adjustments.

NEXT -- Continue to next step.

5. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM)

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

(b) Clear the DTCs Pre-Collision System.

(c) 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 40 km/h (25 mph) or more.

(2) Turn the cruise main switch on.

(3) Enter vehicle-to-vehicle distance control mode.

(d) Recheck for DTCs.

OK:

DTC C1A11 or C1A14 is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END