[demick]

Cars with seat memory have the option to have the pass side mirror swivel down when reverse is engaged.

To enable this, the car must be in reverse when setting the seat memory
To disable, don't have the car in reverse when setting the seat memory.

I would assume that if you removed the seat control module, that the swiveling mirror option goes with it. Perhaps if you leave the control module in place (even without the power seats), you could still have the auto-swivel mirror functionality.