Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B56N
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2021]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM (for HV Model): C1A0A; Front Radar Sensor Country Code Mismatch; 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]

DTC

C1A0A

Front Radar Sensor Country Code Mismatch

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.

    Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

  • 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.

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

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.

(c) Check for DTCs.

Powertrain > Radar Cruise2 > Trouble Codes

Result

Proceed to

DTC C1A0A is not output

A

DTC C1A0A is output

B
A

USE SIMULATION METHOD TO CHECK

B

2.

REPLACE DRIVING SUPPORT ECU ASSEMBLY

(a) Replace the driving support ECU assembly.

Click here 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

NEXT

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.

(c) Check for DTCs.

Powertrain > Radar Cruise2 > Trouble Codes

Result

Proceed to

DTC C1A0A is not output

A

DTC C1A0A is output

B
A

END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)
B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY