DTC B278D-96: ID-BOX Component Internal Failure [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

CLEAR DTC

Clear the DTCs.

Body Electrical > Smart Access > Clear DTCs

Result

Proceed to
NEXT

Result:

See step 2

CHECK DTC OUTPUT

Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

HINT:

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

Result

Result	Proceed to
B278D-96 is not output	A
B278D-96 is output	B

Result:

END

Result:

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]