i had the same issue, mine was bad wiring in the seat controls, dont ask me how they are all interlocked, but it cost me 97 for labor, and 1.20 for parts, did the trick
Ditto this - my seat stopped working about a month ago (and steering wheel). My husband finally got some time to look at it and per threads here removed the side cover of the driver's seat and unpluged/cleaned and plugged in the seat control harness...nothing is cracked...looks fine.I am having a similar problem. I have an E39, 2002 530i, and fuse 13 is habitually blowing. I took the seat controls apart as suggested and I found no damage to the control module or pinched wires. I put everything back together. The seat adjusted without me in it. I carefuly sat down in it, putting my wieght slowly and squarly in the middle. It the seat work fine with me in it. As I got out, shifting my weight to the left and sliding out, fuse 13 blew again. I weight all of 180 lbs and I do not understand why it would have blown as I shifted my weight out of the seat. Any thoughts?