well if the unit wont eject the CD, then you are going to have to disassemble it piece by piece until you can get it out, putting it back together is by far the hardest part, an most people will end up just breaking it worse
p.p.turn to (red) cabble (gnd) & to (black) cabble (+5v) on el.motor thats wil eject your cd
sorry for my english
.........warning only 5v. and cut-off your navi..........