2005 Chevy Cobalt LT auto lock issues? - 1

Just bought a used 2005 Chevy Cobalt LT 4 dr for a steal at $1200. Just need help diagnosing and fixing some small issues that have presented.

1. The auto lock feature on both passenger and driver doors the button doesn't work. The automatic mirror button also doesn't work, however the automatic Windows do. The automatic locks switch on and off as the car moves from park to drive. So just the buttons themselves aren't working, I've checked the interior fuses already.

2. The trunk makes a clanking as if it's trying to unlock itself when pressing the unlock button, but can be opened with the key.

3. I bought a key fob as I did for my previous ford off eBay. However I can't figure out how to program it, I've heard you need to go to a dealer, any chance I can do it myself?

Thanks for your help guys!

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