txmike

1)I have 2007 e350 and on command it read navigation device unavailable. I took out 20 amp fuse next to navigation system in trunk and put back in and system worked. The next day same thing. I did the same thing and it worked. Today, same thing. Anybody, know what may be causing the lose of power to navigation system? 2)Also, with the radio, cd player, & etc. is there a way, for example, if I am listening to radio and Want To Turn It Off without turning the whole system off or switching to cd player or something else. Is there a way of turning radio off? 3) I don't know when I switch from one to the other if the first one is still running in background. Any thoughts on that also. Thanks so much for your time!! Mike