I went through this a couple of weeks ago when I changed my battery. I called the dealer with the VIN # and was told that it probably wouldn't help because radios get switched around a lot. The service tech told me how to remove the radio (depress the two vertical slot-shaped buttons on either side and then gie a tug) because the only really useful # would be the radio serial numbers. As it turned out, the VIN worked, and I was again rockin with dokken as they say.