I just purchased the sony XM car kit.I already have the home kit and it works great. I installed the car kit and when I hit the power button the screen flashes once and shuts off. I checked the fues in the car plug and it is fine. I took the Sony unit back in the house and it works fine. Why won't it stay on? Is there a switch to hit to make it work in the car?Please Help!!!!!!!!!!!!!!!!!!//content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif