2000 Chevy Impala Problems after disconnecting stereo.

I plan to install an aftermarket stereo in my 2000 impala. I purchased a relocation harness for the factory head unit since it controls the oil life monitor, tire monitor, etc. I want to put it in my trunk. I unplugged the factory head unit, plugged the relocation harness into the radio harness, and plugged the head unit into the relocation harness. It worked like it is supposed to, I believe. I put everything back the way it was, and noticed that my service engine light is on, my airbag light is on, and my driver's side power lock no longer works. Any ideas?