PRE-COLLISION: PRE-COLLISION SYSTEM (for HV Model): C1A11,C1A14; Front Radar Sensor Incorrect Axial Gap; 2019 - 2021 MY Avalon HV [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001BE5H
Model Year Start: 2019	Model: Avalon HV	Prod Date Range: [04/2018 - 08/2021]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM (for HV Model): C1A11,C1A14; Front Radar Sensor Incorrect Axial Gap; 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]

DTC

C1A11

Front Radar Sensor Incorrect Axial Gap

DTC

C1A14

Front Radar Sensor Beam Axis Not Adjusted

DESCRIPTION

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

Based on signals from the millimeter wave radar sensor assembly, the driving support ECU assembly sends pre-collision system 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. If 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 has not been performed, DTC C1A14 will be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A11	Front Radar Sensor Incorrect Axial Gap	When the power switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.	Millimeter wave radar sensor assembly
C1A14	Front Radar Sensor Beam Axis Not Adjusted	When the vehicle is being driven at a speed of 10 km/h (7 mph) or more, incompletion of the millimeter wave radar sensor assembly beam axis alignment is detected for approximately 0.2 seconds.	Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
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

PROCEDURE

1.	ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Perform millimeter wave radar sensor assembly adjustment.

Click here

2.	CHECK FOR DTCs

(a) Clear the DTCs.

Body Electrical > Pre-Collision 2 > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC C1A11 and C1A14 are not output	A
DTC C1A11 or C1A14 is output	B

END

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY