DTC P2769: Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL); DTC P2770: Open in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL): Wiring Diagram
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.