GM Theftlock 2003
Polarzak, I'm not going to elaborate, because my knowledge in this area is strictly limited to a conversation that I had with one of the local GM technicians after I replaced the battery in my '02, and then realized that I had lost or misplaced my unlock code. Anyway, it seems to me that he said that beginning the next year, or 2003, the radios were vehicle specific, or whatever, meaning that those equipped with Theftlock would not work until they were programmed to the vehicle, which could only be done by the dealer. A bit of a pain in the butt, I know, but, on the the other hand, it doesn't make a lot of sense to install a security system and then post the procedure to get around it on the internet. That said, I would think that they might ask for a receipt for the purchase of the radio as well.