Toyota Avalon Service & Repair Manual: Lost Communication with Front Camera Module (U023A)

Toyota Avalon Service & Repair Manual / Engine / Cruise Control / Lane Departure Alert System (w/ Steering Control)(for Hv Model) / Lost Communication with Front Camera Module (U023A)

DESCRIPTION

When a communication error between the forward recognition camera and the power steering ECU (rack and pinion power steering gear assembly) is detected, the forward recognition camera notifies other ECUs and DTC U023A is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U023A

Lost Communication with Front Camera Module

When the power switch is on for 2 seconds or more, a communication malfunction between the forward recognition camera and the power steering ECU (rack and pinion power steering gear assembly) is detected for 5 seconds or more.
  • Power steering system
  • Forward recognition camera

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.

    Click here

PROCEDURE

1.

CHECK FOR DTCs

HINT:

If DTC U023A is stored, the power steering system may be malfunctioning. Check for DTCs related to the power steering system first.

(a) Check for DTCs.

Chassis > EMPS > Trouble Codes

Result

Proceed to

Power steering system DTCs are not output

A

Power steering system DTCs are output

B
B

GO TO POWER STEERING 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 U023A is not output

A

DTC U023A is output

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE FORWARD RECOGNITION CAMERA

    Terminals Of Ecu

    Lost Communication with TCM (U0101,U0123,U0126,U0129,U0131,U0142,U0155,U0293)

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