DTC B278C: Lost Communication with Power Source Control [12/2017 - 10/2023]: Procedure

CLEAR DTC

Clear the DTCs.

Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

Body Electrical > Smart Access > Clear DTCs

Result

Result
NEXT

Result:

NEXT

See step 2

CHECK FOR DTC

Check for DTCs.

Refer to DTC CHECK / CLEAR [12/2017 - 10/2023]

Body Electrical > Smart Access > Trouble Codes

Result

Proceed to
DTC B278C is output
DTC B278C is not output

Result:

DTC B278C is output

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [12/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

Result:

DTC B278C is not output

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]