don't change the pcm yet. it might be the ignition relay. this controls your accesories. headlights, blower motor etc. it has several contacts in it and if one or more of these contacts go bad then you wills start seeing intermittent or possibly a total failure of one or more of your accesories. here's a link to another forum to give you a better idea of what you're facing:ClubGP Message Forum troubleshooting