A couple of suggestions for you, based on my own experience getting my mid 90's Eldorado bucket seats to work:
-Study the passenger seat wiring closely, to see how it is wired, as it doesn't connect to a memory module/switch. If it works properly as-is, see what added wiring is in the driver's side seat, that can be removed/bypassed to allow it to operate.
-Use your VOM, set to continuity checking, to verify which of the loose wires on the driver's side seat are actually common, & just need to be connected together. (Effectively bypassing an external memory switch....)