ECU Power Source Circuit [09/2023 - ]: Description
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.
If the supply power to each ECU is discontinued due to a malfunction of the auxiliary battery power supply, the electronic shift system does not operate. Make sure to inspect the power supply system of the auxiliary battery for each ECU.