1998 Jeep Cherokee Could it be the PCU? Many electrical pro

Hello. I have been having many electrical problems happening with my Jeep recently. They seem to be intermittant and extremely annoying.

-Intermittant air bag light (already replaced harness to gauge cluster and made sure connections are good)

-Window switches work intermittantly on passenger controls, electric mirror controls don't work

- Heat/fan blower shuts off on it's own and then comes back on no matter what the setting is on

- Fan blower for heat/ac stayed on for 5 minutes after shutting off the vehicle AND REMOVING THE KEY, and was still controllable with fan speed selector! (This one took the cake of my confusion)

I actually removed the bulb that shows the airbag warning because it was too annoying to me. I have had my dash apart on so many different occasions trying to find any problems with the way the gauge cluster was sitting. I also replaced the faulty wire harness that causes the gauges to spontaneously drop up and down and that issue is fixed. I had a mechanic friend check the warning codes and there was nothing that said that there was a disconnected cluster. I am contemplating purchasing a remanufactured PCU to see if that has anything to do with my problems, unless you have any other ideas or have heard these symptoms before. I love this jeep and would hate to ever get rid of it. I have always taken good care of it and just want everything to work as it should. Thank you for your time.