I attached a guide for you to follow for resetting the security system, Try that and see if the system works.
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.
Images (Click to enlarge)
Tuesday, September 14th, 2021 AT 2:35 AM