DTC B2456: Left Headlight ECU Variation Error [10/2017 - 09/2019]: Procedure

WARNING: This page is about a different car, the 2019 Toyota C-HR and 2018 Toyota C-HR. However, it is still accessible from the selected car via links, so may be relevant.

CLEAR DTC

Clear the DTCs.

Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

Body Electrical > HL AutoLeveling > Clear DTCs

Result

Proceed to
NEXT

Result:

See step 2

CHECK FOR DTC

Turn the ignition switch to ON.
Turn on the headlights using the light control switch.

Check for DTCs.

Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

Body Electrical > HL AutoLeveling > Trouble Codes

Result

Result	Proceed to
DTC B2456 output does not occur	A
DTC B2456 output occurs	B

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 05/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019]

Result:

See step 3

CHECK ECM

Check that the ECM part number matches the vehicle.

Result

Result	Proceed to
ECM part number matches vehicle	A
ECM part number does not match	B

Result:

REPLACE ECM. Refer to REMOVAL [10/2017 - 08/2020]

Result:

See step 4

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Check that the main body ECU (multiplex network body ECU) part number matches the vehicle.

Result

Result	Proceed to
Main body ECU (multiplex network body ECU) part number matches vehicle	A
Main body ECU (multiplex network body ECU) part number does not match	B

Result:

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to REMOVAL [10/2017 - 09/2019]

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [10/2017 - 08/2020]