I just replace my Business CD radio with an aftermarket one, and I have no FM signal. My installation kit from Crutchfield did include the proper adapter so that I could plug the antenna wire into the radio.
Could it be that this is the FM antenna amplifier and I need to plug it back in?
I pulled it along with the DSP amp when I tore out everything related to the oem radio.
EDIT, did some Google searches, and the above module appears to be for the Voice Control functionality, some sort of communications control module.
I guess I'll plug it back in just to see if that does the trick, but it probably won't.
Anyone else had issues going from the Business CD DSP radio to aftermarket and loosing FM reception?