DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [11/2021 - ]: Wiring Diagram

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.