delco loc radio

Just Great! So a Friend? gives me a Better? stereo for my van, I rip out the old delco, carefully solder in the new one and all I get is LOC. Am I screwed or what? Any help would be great!!

look at the front of the radio if it says theft loc or somthing simillar chances are you triped the theft prevention system. take vehicle to dealer they can unlock it so it works