Purchased a navigation radio head unit to replace my current one , thought my amp had gone out in the radio part of the navigation head unit, turns out that the problem was my front passenger speaker was shorting out, causing no audio to be heard from any of the speakers. So now I have a backup nav radio head unit, so I connected the extra head unit up to make sure it worked, I didn't have the radio code for the extra unit so I called my local dealership to get the code, but they are giving me a 5 digit code when the unit will only accept 4 digits, so the code they are giving me will not work. I've called another dealership to see if they get a 4 digit code, but they give me the same 5 digit code which is not possible to enter? Anyone have any idea why they are giving me a 5 digit code when it will only accept a 4 digit code? I've double and triple checked the serial number, I am at a loss here?