Driver's seat not working

The drivers seat module could be faulty, it seems more common in E53 and E46, but stranger things have happened. I am unsure of where they are on the the old E65 but by plugging in another one should be a good test, It should work, but will need coding to the vehicle if it is to be fitted permanently, if you want everything else on the K-Can to be reliable. Worst case, have the car checked by your nearest BMW dealer. Goodluck