Toyota Avalon Service & Repair Manual: Communication Error from FCM to Driving Support ECU (C1A72)

Toyota Avalon Service & Repair Manual / Engine / Cruise Control / Lane Departure Alert System (w/ Steering Control)(for Gasoline Model) / Communication Error from FCM to Driving Support ECU (C1A72)

DESCRIPTION

If a communication error between the driving support ECU assembly and forward recognition camera is detected, DTC C1A72 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A72

Communication Error from FCM to Driving Support ECU

2 seconds after the engine switch is turned on (IG), a communication error between the driving support ECU assembly and the forward recognition camera is detected.
  • CAN communication system
  • Forward recognition camera
  • Pre-collision system

CAUTION / NOTICE / HINT

NOTICE:

  • 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.

    Click here

  • The lane departure alert system (w/ steering control) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

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PROCEDURE

1.

CHECK FOR DTCs

HINT:

Confirm that there is no communication error between the forward recognition camera and driving support ECU assembly.

(a) Check for DTCs.

Body Electrical > Pre-Collision 2 > Trouble Codes

Result

Proceed to

DTC U023A is not output

A

DTC U023A is output

B
B

GO TO PRE-COLLISION SYSTEM

A

2.

CHECK FOR DTCs

(a) Clear the DTCs.

Chassis > LKA/LDA > 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.

Chassis > LKA/LDA > Trouble Codes

Result

Proceed to

DTC C1A72 is not output

A

DTC C1A72 is output

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE FORWARD RECOGNITION CAMERA

    Power Steering Control Torque (C1A71)

    Driving Support ECU Receive Data Malfunction (C1A73)

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