The parts that were replaced were good. The problem that you have lies in the security system. If the light is on, it will shut down the engine and not start. Interestingly, if you wait aprox 10 minutes with the key on, it will over ride the system and it should start. THat is what you described. That is why I'm sure that is where the problem is coming from. Now, the bad news is there is no way to bypass the system. Here is the worse news. THe only place with the proper test equipment to diagnose the problem is a dealership. If you have lost faith in the present dealer and there isn't another one close, contact the district rep from GM. The number is in the owner's manual. Explaine the problem and how it's related to the security system. THen tell him / her the dealer can't fix it. He / she will have it taken care of for you.
I will be honest. I can't tell you how many times I answer questions like this dealing with GM vehicles.
Let me know if you have other questions, and thanks for using 2carpros. Com.
Sunday, January 10th, 2010 AT 10:14 PM