Hi every one,Recently bought an identical sat nav on ebay for my 2002 doblo, mainly for the discs,its a infotelematic connect nav, however on trying it out it glimmers for a few seconds, then goes out, nothing else happens and all connections are the same,is it possible I can get this to fire up or is it a fault with it,incidently ,whats a bus cam line? I read that if you reverse these two it might come on,hope some one can help regards,bucca.