The step motors are usually window lift motors or wiper motors from one of the automotive manufactures. So take yours off and take it to a auto parts store, and see what matches up with it! First i would test yours to make sure it is not just a dirty connection, bad ground, etc! Can't help you on the Intelltek buttons?
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"