Well, you are probably going to have to back trace all the similar wires, to see where they actually run (or get s circuit finder, but even then you need to find the location where that wire ends).
For the diagram, look at a FSM, or other manual(Haynes or Chiltons). You can download 94&95 manuals from a link in the garage section, but they are slightly different ECUs than 93 and older IIRC.
When you have time, add your self to the list in this thread: http://www.nissanpathfinders.net/forum/index.php?showtopic=3050&view=&hl=self alley&fromsearch=1