SL Solenoid
WARNING: This page is about a different car, the 2002 Toyota Avalon and 2001 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
ECM controls TCC lock-up by delivering an output signal to SL solenoid. SL solenoid is activated when gearshift lever is in "D" position and vehicle is at specified speed. SL solenoid is located on transaxle valve body. See Figure.