If you have never installed one of these in a Pontiac I would Highly suggest you do some research or have it done.
A chiltons or haynes manual might have what you need as far as identifying the wires. I have only done 2 installs over the last 20yrs and I refuse to mess with them any more unless its an older car without that damn passlock system
I'm sure others here might be able to give you some more detailed info, as thiers been several that have had the remote starters installed.
Good Luck, and Welcome to AF!