DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [10/2022 - ]: Wiring Diagram

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