I have an '05 with Nav and the ultimate lockpick with a DVD and an integrated XM unit from the Cleveland dealer ("Eddie"). Everything works great. After installing the DVD player, I noticed the the XM sound volume was lower (at the same volume number). I installe a power on/off switch for the DVD power because, even when the DVD unit is powered off it "takes away" from the volume on the XM --shares speaker wire input??? When I listen to XM, I cut the power to the DVD player. This make the XM about 25% louder. I'd like to also be able to switch off the power going to the XM radio when I run the DVD player - to enhance it's sound. In order to do this, I need to know which wire in the cable running back to the XM radio carries the power. Anyone have a clue which one it is or how I can find out, other than trial and error? Thanks in advance. Rick :huh: