Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Radar Sensor Country Code Mismatch (C1A0A)

DESCRIPTION

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

When the destination information in the millimeter wave radar sensor assembly and driving support ECU assembly do not match, DTC C1A0A is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
C1A0A	Front Radar Sensor Country Code Mismatch	When the power switch is on (IG) and the dynamic radar cruise control system is operating, the destination information in the driving support ECU assembly and millimeter wave radar sensor assembly do not match for approximately 1.3 seconds or more.	Millimeter wave radar sensor assembly Driving support ECU assembly	Does not come on

CAUTION / NOTICE / HINT

NOTICE:

Check that the millimeter wave radar sensor assembly has not been replaced with one from another vehicle.
When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
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.
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First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.
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PROCEDURE

1.	CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > 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.

Powertrain > Radar Cruise2 > Trouble Codes

Result	Proceed to
DTC C1A0A is not output	A
DTC C1A0A is output	B

USE SIMULATION METHOD TO CHECK

2.	REPLACE DRIVING SUPPORT ECU ASSEMBLY

(a) Replace the driving support ECU assembly.

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3.	CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > 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.

Powertrain > Radar Cruise2 > Trouble Codes

Result	Proceed to
DTC C1A0A is not output	A
DTC C1A0A is output	B

END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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