2002 Chevy Monte Carlo 2002 Monte Carlo SS electrical probl

For about two weeks now when I go to crank my car, randomly my security light flashes and the car wont crank. I can wait 10 mins and it will unlock and fire up. So I assumed it was a faulty Passlock system that GM is notorious for having and was going to replace it. However in the last two days other problems have come up. When I stick the key in and turn it, my fuel gauge (possible others in the cluster as well, I will check later) wont initiate, my fuel pump wont kick on and I get low fuel and service engine soon displays. After leaving the key in the ON position for about 45 seconds, everything kicks on, you can hear the relays and fuel pump all active normally and the car will then start. Also since then some of my interior lights wont work (my temp gauge works but illuminates sometimes and other dont), my AC/Heater thermostat lights work sometimes, my rear view mirror lights work sometimes (the lights for the auto dimming mirror power and Onstar). Also my passenger side front corner light/blinker works sometimes and not others.

Could this possibly be a BCM beginning to fail causing Passlock to trip as well as lighting/gauge/fuel pump (and relays) to delay activating? Or more malfunctions caused by the cars ignition switch?

Also I know where the PCM is located on this vehicle, but I'm not sure where the BCM is located. I'm assuming behind the dash somewhere just above the brake pedal? Any and all help would be appreciated.