Nope. All wrong. Starting in 2003 (for trucks, some cars are different) the radio is a Class2 device just like the PCM, BCM, or EBCM. They do not have the old theftlock system that is broken by holding 2 and 3 and calling GM for an unlock code. They have to have the stored VIN match the VIN in the BCM, etc. The only was to do that is SPS programming b the dealer (TIS2000) the same way a PCM is flashed. And no, usually different year model radios won't work. The newer the truck, the less likely it can be made to work. Remember, there are at least 5 different option levels each year plus the fact each option might have 6-8 radio part number changes in one year model. Add in the fact software changes as well then you probably have a useless "new" radio.

What was the reason to buy a different year radio? Is there something that we might be able to fix another way?