From what I was told at the dealer when I brought a head unit I got from the j/y out of an 04 SE they said I could not use it cause the pin was to the vin of the other car. Even if i had that pin they could not program that head to work in my car. They also said that I would have to send it off to a place that fixes them to clear the old vin out of it so that they could make it work in my car. The guys i talked to are good friends of mine there so they weren't just feeding me BS to get a new one from them. In the end i just took the face plate off the j/y one and put it on mine.
2005 Pontiac Bonneville GXP
2008 Chevy Impala 3LT 3.9L (9C3)
2000 SSXP (retired) all over the country in a million pieces