Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Left Headlight ECU Variation Error (B2456)

DESCRIPTION

This DTC is stored if the headlight ECU sub-assembly LH for another destination is installed.

CAUTION / NOTICE / HINT

NOTICE:

• If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

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• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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• Before replacing the ECM, refer to Registration.

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PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

(e) Clear the DTCs.

NEXT

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

(e) Check for DTCs.

OK:

DTC B2456 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

(a) Check if the part number of the ECM installed to the vehicle is correct.

OK:

Part number is correct.

NG

REPLACE ECM

OK

(a) Check if the part number of the main body ECU (multiplex network body ECU) installed to the vehicle is correct.

OK:

Part number is correct.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)