Thanks for the tip, but if the switch is faulty, why would there be a waiting period??

Hi folks, I'm at the end of my proverbial rope! here goes, I turn the key to the on position, and all the usual dash lights come on ...except the cel. the car cranks , but doesn't start. If i wait 30 to45 minutes with the key on,.the cel illuminates and i can hear the idle air control valve activate...