DTC P178A-14: Gear Shift Control Module "B" Wake-up Circuit Short to Ground or Open; DTC P178D-14: Gear Shift Control Module "B" (Sub CPU) Wake-up Circuit Short to Ground or Open [10/2022 - ]: Wiring Diagram
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.