It only took a short look at the power distribution on a wiring diagram to guess where the fault was coming (#2 fuse).
My next guess without reviewing is that the power seat diode is bad.
This diode is involved with the ability for the seats to be adjusted with the key off when the door is open.
The key here with the fuse is that the fuse is not involved with the SRS system.
Bosch Master, ASE Master, L1
33 years MB technician