There is a power connector that you can disconnect and stretch out from under the seat. Apply ~12V using external Power (battery) and extra wires to move the seat unless motor is blown. It is possible that fuse is blown that controls power to the interior. It's worth a check first.
2013 535XDrive, 110k Miles
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1997 328is, 335k Miles - RETIRED
1998 Mercedes ML320, 200k Miles - SOLD
2005 Volvo XC70, 160k Miles
2018 Audi Q5, 100 Miles