Damn! I figured it out. There is an 8 pin plug on the back of the radio. This plug is for the harness wires to the subwoofer amp. It was never plugged in or the previous owner unplugged it. Just in case someone has the same problem, No sound from the subwoofer, check and make sure the smallest plug on the back of your head unit is plugged in. Again, it is a 8 pin. plug.