The only other thing that comes to mind is that in the later years (not sure when it started, but perhaps in '96?) was that the headlights were tied into the wiper system through the BCM. From what I understand was if the wipers were turned on, the headlights would also come on, no matter if it was dark or light out. I guess it was one of those safety things where it is assumed that if the wipers are on, then there must by "bad weather," so naturally the headlights should be turned on as well...
I don't know much at all about this "feature," so I can't be of much help...