SOURCE: XM radio sounds like crap!!!
I have my XM antenna on top of the cab immediately above my head and the Garmin inside the cab near the front speaker. So that would be another option in case you don't want to or don't have the cable to put one in the back. Have experienced no problems as of yet. Sound seems fine with my arrangement.
SOURCE: Kenwood DDX6019 no screen function
Grounding the wire out is probably not good enough unless this is an old model. The newer units require the parking brake lead from the head unit to be wired into a toggle switch. Take the lead wire it to one of the switch terminals, then wire the other terminal to the head unit ground wire. To make it work, simply toggle the switch twice-one up then down again. This imitates the parking brake being set. This is a dopey but effective illustration:
http://i132.photobucket.com/albums/q21/kthanid212/img057.jpg
This should get your screen working without the parking brake on.
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