vvvddd2003

I bought a 2001 Silverado. I did not try the power seats because they felt right. Well when I did they did not work. I checked the fuse and it was ok. There is an aluminum relay or circut breaker that I have not had tested.

I know that GM wires a lot of things through the radio and the previous owner had a aftermarket cd player installed. My question is could the problem be the radio not being wired correctly?
Any help would be appreciated.

Thanks
Adam