What year did GM switch from needing a security code to having the VIN
programmed into the radio? My 98 needs a security code but along in the
2000 MY timeframe they switch to the VIN system. If the later, removing the
radio shouldn't need any special action. When re-installed, the system will
sense it has the correct VIN and should work.
Is there any info in the owner's manual?
If you don't have an owner's manual I found a GM site
https://www.mygmlink.com/main/US/en/gm/homewhere you can register your
vehicle by VIN and, amoung other things, download a manual for more recent
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