factory keyless entry/alarm

not sure if this is the proper forum for this and for that i appologize. I was wondering where the "brain" for the factory alarm and keyless entry is? is it the box with all the wires spewing out in my jack-storage compartment? What i want to do is when i unlock the doors or have the doors open have the reverse lights and the factory foglights come on along with the interior lights and the mirror puddle lights. The reverse lights on my girl's 2000 impala come on when you hit the unlock button to illuminate the rear of the car. I want to do that plus one better and see the fogs come on for the front. I want to find the wire coming out of the alarm brain that controls the puddle lights and jump in a control wire for a simple relay to power the reverse and fogs. what do you guys think??