Did you switch out the wiring for the doors? There could be the off-chance that there is a different style of switch for the doors themselves. What I would do, to trace the wiring from the door, is look in the passenger compartment first, as the wiring for most door chimes is under the dash
These are connected to the little pushbutton switch that activates when you open the door. Also rember that all accessory wiring goes to the passenger compartment fuse panel (not the underhood fuse panel).
Having said that, you may have to remove the doors from the vehicle and use a helper to try and trace the wire harness from the door frame to where it goes either: A) into the passenger compartment, or B) into the engine compartment before going into the passenger compartment. You'll need the second body to tell you which wires are what, if you choose to use the 'tug' method (tracing the wires by tugging on them, then watching which wires move elsewhere).
Hope this helps.
PS: Wiring diagrams for '90 should be the same for the '92.