If you do your own work, you will want to buy a Bentley manual for your car. (available on Amazon) It will have your wiring diagrams as well as pretty much everything else you need to know.
Is the problem in a switch? The most common problem with BMW seats of that vintage are broken nylon gears. Some of the nylon gears are available from places like OdometerGears.com. Much cheaper to buy a nylon gear than to buy a new gearbox from the dealer.
My 1997 BMW 528I transmission lights will not display correctly and transmission will jump in low...
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My 1997 BMW 528I transmission lights will not display correctly and transmission will jump in low S-3 gear when stopping.