Power Seat Position is not Memorized: Description
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
When the seat memory SET switch and a memory switch (M1, M2 or M3) are pressed simultaneously, the front multiplex network ECU LH commands the front power seat switch LH (driver seat ECU) through CAN communication to record each position sensor's value.