see my website under
Seat & Mirror Memory Training Reference Book
Find the wiring diagrams for the car, donor car E32
http://shark.armchair.mb.ca/~dave/BMW/e32/
compare with your E34 built year and month
http://shark.armchair.mb.ca/~dave/BMW/e34/

If you do not add to your profile the exact model, built year and month and country version such as U.S. or EURO and last 7 numbers of your VIN, no one help in detail