DTC P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2) [06/2014 - 08/2015]: Wiring Diagram

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.