Try Pressing and holding radio preset station buttons 1 & 6 while you turn the radio on, that should at least give you the radio serial number, which is what you need to get the code. If this doesn't work you will need to pull the radio out and get the serial number, in any event you need that number to get the code.

The problem is the same as I have with my '01 VW. The radio self locks on power loss and the correct code must be entered on power-on. It's a theft deterrent idea that does work. So well in fact that without knowing the code, you're almost out of luck.

Now, each radio has a different serial number, and the code is listed by the radio's actual serial number. The VIN cannot tell you exactly which radio went into that car, so getting the code isn't really possible by just the VIN number. The best idea for you, pull the radio yourself (if you're able) then talk to the dealer with the actual serial number for the radio. Then can then look into the records for that radio on get the code for you. :) I hope this helps bud!