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No you can't just disconnect it.It consists of 3 modules 2 of them communicate with each other.If any components are replaced a GM tech 2 scan tool is required to program them and do theft deterrent relearn procedure.If this is not followed the system will not function properly.There are specific codes and data that could help lead to a proper diagnosis without changing all 3 modules.You would need a tech 2 scan tool to access that info.Please click on my accept button after viewing your answer.
The forum is to give advice. In your case the advice is that your particular problem requires some expensive and sophisticated equipment and a highly trained technician to opereate it. The magic wand won't work here.