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You would do better just buying another DVD NAV unit and installing it. Although, I don't know if there are protections build in to prevent...
My guess is that the laser has failed in the DVD unit.
As long as you don't disconnect your 12V battery. Doing so will reset all of your ECU's and will revert your reverse beeping back to stock.
Hop on eBay and search under item number 222438880862 . That's the one I picked up. It shipped quickly and included the Techstream software....
You can easily program a virgin smartkey in about 30 seconds with the Techstream software. Be SURE that the replacement smartkey has...
Why not just run Techstream (dealer) software? The USB/OBD2 cable is around $16 or so and you will not only be able to turn off the reverse beep...