2000 jimmy wont reprogram

Hi I am redoing a stolen recovery truck. I am at the point of reprogramming the computer. I have done the 30 minute pass lock reprogramming steps but it doesn't seem to be working. Now my security light stays on all the time and my scanner will not read it anymore.

Any suggestions or advice would be greatly appreciated.

Dennis

Welcome to AF,

My best advice would be to post your question in the relevant forum for the vehicle you're working on.