DTC U11BF-87: Lost Communication with TCM (ch5) Missing Message [09/2023 - ]: Wiring Diagram
WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
Refer to the wiring diagram for TCU Power Source Circuit.
Refer to TCM Power Source Circuit [09/2023 - ]