Hello, I had a similar problem with mine, seat adjusted fine, steering wheel adjustment pretended not to work at all! nothing no up down in or out.
changed out the seat module, and all worked like magic!
strongly suspect one of the relays in the module itself is shot.
once i get a bit of time i will tear the module apart and see what the cause of the failure was and repair it (hopefully) to have a spare kicking around!
best of luck, wreckers may be a good source for an inexpensive module!

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2003 X5 3.0i (02/2003) sport package, Sapphire black metallic / Black Dakota Sport seats. compass mirror retrofit, trailer hitch retrofit, Prodigy P2 trailer brake controller installed, PDC retrofit, Lumbar support retrofit. heated rear seats retrofitted. Running boards retrofitted and subwoofer install in progress. 4.8is Brakes installed front and back. Bluetooth TCU installed, Rear Fog lights installed. Retrofitted reclining rear seat backs.