Anti-theft microchip won't let me start my 2000 Jeep Grand Cherokee

I have tried everything to bypass the Anti-theft device on our Jeep. I have tried different keys, removing the battery, touching the battery cables together. Is there anything else I can do to remove or bypass the this device?

How has your Internet search gone (besides CarTalk)?

I haven’t been able to find anything specific to the Anti-Theft device, lot’s of other chatter about the Grand Cherokee not starting. I have spoken to the dealer, who informs me to tow it in and they’ll give me an estimate, and several mechanics with the same advice. However, before I invest even more money towing the vehicle and then finding out they want to charge me a lot of money for a quick fix, I thought I would do my homework.