DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [08/2020 - ]: Wiring Diagram

WARNING: This page is about a different car, the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, and 2021 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.