Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001AULQ
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): B2456; Left Headlight ECU Variation Error; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]

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

Headlight ECU sub-assembly LH

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • Before replacing the ECM, refer to Registration.

    Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

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

    Click here 2019 - 2021 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 06/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): INITIALIZATION

  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.

CLEAR DTC

(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 / AFS / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs

NEXT

2.

CHECK FOR DTC

(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 / AFS / Trouble Codes.

(e) Check for DTCs.

Body Electrical > AFS > Trouble Codes

OK:

DTC B2456 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

CHECK ECM

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

OK:

Part number is correct.

NG

REPLACE ECM

OK

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.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)