Trigga, Pontiac didn't use metal switches on our cars. That'* something you'll have to figure out on your own, or ask the previous owner.
Don't get your remote fobs at the dealer. They'll rape you. Get them off eBay or PM jr's3800.
Check for RPO code "AUO" on your RPO label in the trunk (on the spare tire cover) to make sure you have keyless. Erase any doubt that way.
Do you have the bass gain control 'slider' under the stereo? If not, you don't have the aftermarket amp. If you do, the amp is INSIDE the forward part of the center console under the ashtray. It drives HALF of each rear deck speaker. These are dual voice coil speakers. The HU drives the first coil, and the bass amp (with bandpass filters) runs nothing but bass through the second.
Now, are we having an electrical PROBLEM? Or should this be in General Chat?