you also said you soldered all the wires to the correct wires..

did you solder matching wires? or the right wires?

there are some harnesses/cars that dont match up perfectly. im not overly familiar with best buys harnesses, but it could be something as simple as missing one wire, or connecting one thing to the wrong wire.

power, ground, remote. those are the important ones. get those, and the rest will follow.