DTC P0688-1F: ECM/PCM Power Relay Sense Circuit Intermittent [11/2022 - ]: Wiring Diagram

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