Power Mirror Surface Position is not Memorized: Description
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
When the seat memory M1 or M2 switch is pressed, the multiplex network door ECU front LH (driver door ECU) sends a memory switch status signal to the position control ECU (for driver side). Then the position control ECU sends the following to the door ECU front LH and RH: 1) a memory M1 or M2 memory recall signal, and 2) a driver and front passenger seat mirror position memory recall signal recorded in memory. When the door ECU front LH and RH receive the memory M1 or M2 memory recall signal, and then receive the driver and front passenger seat mirror position memory recall signal within 1.2 seconds, the door ECU front LH and RH activate the mirror control motors to move the mirrors to the previously recorded positions.