DTC B2456: Left Headlight ECU Variation Error [02/2019 - 12/2021]: Procedure

WARNING: This page is about a different car, the 2021 Toyota RAV4, 2020 Toyota RAV4, and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / AFS / Clear DTCs.

Clear the DTCs.

Body Electrical > AFS > Clear DTCs

Result

Proceed to
NEXT

Result:

See step 2

CHECK FOR DTC

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / AFS / Trouble Codes.

Check for DTCs.

Body Electrical > AFS > Trouble Codes

DTC B2456 is not output.

Result

Proceed to
OK
NG

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

Result:

See step 3

CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY

Check if the part number of the hybrid vehicle control ECU assembly installed to the vehicle is correct.

Part number is correct.

Result

Proceed to
OK
NG

Result:

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021]

Result:

See step 4

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

Part number is correct.

Result

Proceed to
OK
NG

Result:

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to REMOVAL [02/2019 - 12/2021]

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021]