LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): B2456; Left Headlight ECU Variation Error; 2021 - 2022 MY Avalon [08/2020

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001QM6G
Model Year Start: 2021	Model: Avalon	Prod Date Range: [08/2020 - ]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): B2456; Left Headlight ECU Variation Error; 2021 - 2022 MY Avalon [08/2020 - ]

DTC

B2456

Left Headlight ECU Variation Error

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B2456	Left Headlight ECU Variation Error	Detection condition: The engine switch is on (IG). Malfunction status: Vehicle specification information received via CAN communication is continuously mismatched Malfunction duration: -	ECM Main body ECU (multiplex network body ECU) Headlight ECU sub-assembly LH	HL AutoLeveling

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.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
Before replacing the ECM, refer to Registration.
Click here

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

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

(e) Clear the DTCs.

2.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

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

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

(e) Check for DTCs.

OK:

DTC B2456 is not output.

CHECK ECM

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

OK:

Part number is correct.

REPLACE ECM

for 2GR-FKS: Click here

for A25A-FKS: Click here

4.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(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.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)