Here is what I found on another forum. Hope this helps.
I believe we have similar radios, no stickers on the top. The only stickers I have seen are on the 6 disc radios and that was instructions for ship mode. I have pulled the battery terminals several times with the factory head unit and never had a problem when I reconnected it. The radio just needs the clock reset, and if you have pre-set radio stations you would have to re set them but thats it.