Help with the Acura MDX Problem that Navigation system doesn't work when i was changing dissconect battery?

I was just disconected the batery for a repair now my radio, navigation and dvd player need a code help.. The car did not come with a manual and there is no stick or card it is the dvd and navagation system also.|||Did you buy your MDX used? It should have came with a card that had both the radio and NAVI codes. You will have to call your local Acura or Honda dealer, give them your VIN and they will be able to tell you them. Be sure to write them down, then sign up for My Acura http://owners.acura.com/ and you can enter the codes in there, so they will never be lost.|||The only thing you can do is to contact the original dealership that the car was purchased at. The original dealership is the only one that will have the code. You would have to give them serial number on the back of the radio. Good luck taking the radio out because they charge a lot to do it at the dealer.