The infamous Yellow Wire

I have tried to install an aftermarket stereo in my 2008 Savana. I have been told that the yellow stereo wire is the data line and I may have shorted it or blown a fuse trying to install the new stereo. I have checked the stereo fuse under the seat and it is ok. Is there another fuse for this infamous yellow wire? Once I hook the yellow wire back up, there is nothing. The stereo guy said I have probably shorted the fuse or damaged the wire. If i bypass the yellow wire, the stereo works fine. The down side is that the stereo will not shut off when I either turn the van off or open the door. Big problem.
Does anyone have any idea as to what I should do to get this working again. How do I figure out where the problem is with this wire.