DTC P0DE8-18: Hybrid/EV Battery Pack Coolant Control Valve "C" Control Circuit Low Circuit Current Below Threshold; DTC P0DE8-19: Hybrid/EV Battery Pack Coolant Control Valve "C" Control Circuit High Circuit Current Above Threshold; DTC P1F6A-00: Hybrid/EV Battery Pack Coolant Control Valve "C" Monitor Performance [12/2023 - ]: Wiring Diagram
WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.