on the P38, it depends whether you're using key 1 or key 2.
Basically, whatever you save your seats/mirrors etc to whatever memory, press the button down for 2 secs and it'll go automatically to those saved settings.
So, set the seats/mirrors etc to your preference and save to memory 1.
Every time you go to your car, use fob1 and press the "open" button for 2 secs.