Will not start after radio stopped working?

Good morning,

I attached a guide for you to follow for resetting the security system, Try that and see if the system works.

https://www.2carpros.com/articles/how-to-reset-a-security-system

If not, then there may be a code stored in your ECM for failure. I would need that code to help narrow the area of failure.

I attached below a description of the system for you to view. If the key reset does not work, all this will need to be checked.

I also attached the procedure for programming the theft module. You will need an advanced scan tool for that procedure.

Roy