When I disconnect my battery to exchange it with a new one, will it reqiure a Re-set Code to Re-Activate the Radio Operation? You know, the old security protection, once a Car Radio has the Power removed from it.

This is on a 2004 CTS.

NO!!

It's only necessary if the VIN of the car doesn't match with the unit, but if you keep the same radio you will only loose the presets.