Hey guys, just bought a 2006 M5 from a board member and flew all the way from DC to Tallahassee to drive it home

Could not be happier.
The car has the AUX jack in the glove box and has had the ModMyNav backup camera installed already. For some reason the AUX jack is not working properly though. I have tried multiple devices and made sure they were all working properly before I plugged them in. Is it possible that that the AUX jack is not hooked up properly? Any ways to trouble shoot this problem?
Thanks guys, and I am glad to be part of the board.