I have an '06 tC and I spent a good part of the day today installing the Bazooka stock sub (which i bought on ScionPartsPeople.com) and it seems that the steering wheel controls now have stopped working. Anybody have any experience with this or suggestions on how to fix it?

The instruction manual was pretty good for the most part, but gave absolutely no details on hooking the thing up to the back of the head unit. I'm pretty sure I did it right (because the sub works) but you never know... i could have screwed something up

Any help would be greatly appreciated