Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: FCM Destination Information Unmatched (C1AA1)

DESCRIPTION

When the forward recognition camera is replaced with a new one, the new forward recognition camera attempts to store country specification information received from the main body ECU (multiplex network body ECU) and ECM. If the country specification information stored in the forward recognition camera is different from that stored in the main body ECU (multiplex network body ECU) or ECM, DTC C1AA1 is stored.

CAUTION / NOTICE / HINT

NOTICE:

• Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
• If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

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• When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
• If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

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HINT:

This DTC is stored when the destination information stored in the forward recognition camera and that stored in the main body ECU (multiplex network body ECU) do not match. If the forward recognition camera or main body ECU (multiplex network body ECU) has been replaced, check if a forward recognition camera or main body ECU (multiplex network body ECU) from another vehicle was used.

PROCEDURE

HINT:

When DTC C1AA1 is stored, lane departure alert system (w/ steering control) DTC C1AAC may be stored at the same time.

(a) Check for DTCs.

B

GO TO DTC CHART (C1AAC)

A

HINT:

The forward recognition camera communicates with the main body ECU (multiplex network body ECU) via CAN communication. Confirm that the CAN communication system is functioning normally before proceeding.

(a) Check for DTCs.

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Clear the 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.

A

USE SIMULATION METHOD TO CHECK

B

(a) Replace the forward recognition camera.

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(b) Perform forward recognition camera adjustment.

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NEXT

(a) Clear the 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.

A

END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)