I guess I'm not savvy enough to get what they are telling me as a resolution to my problem Something is sucking power when the car is off and dormant. That resolution would remove the VATS system entirely and I thank you for the link. I'm still pressed to understand what is pulling voltage in that system. It works fine and the car starts (when the battery is charged) and runs just fine. Let it sit for 5 days and dead. I'm missing something here?
What you are missing is that the vats module is likely not going to sleep. This can happen from a few reasons. First and foremost there is a set of contacts in the ignition switch lock and tumbler that make up the "key in" circuit. These pins get jumped to each other when you slide the key in the ignition. If these pins stay connected then even after you and the key have left the car, the car still thinks the key is in the ignition. This is one of a multitude of possibilities as to what is causing your specific symptom.
Another possibility is the ccm itself has failed and the board inside or some of its components have fried or gone short. But without this module or the 5v square wave signal it sends to the ecu, the car will not start. Hence why you will need a bypass. Because the ecu is looking for permission to start and that permission comes from the ccm in the form of a 5v signal at a specific frequency. There is a factory correct way to delete the vats without an aftermarket module. This method will involve tunercats and reflashing your eeprom and deleting vats from the ecu so it no longer looks for this permission before starting.
I have personally observed common c4 battery draws to be in doors where the courtesy light right above the inside door handle gets hot and melts the housing or when the door cards are removed and replaced poorly and these wires get pinched and ultimately short to ground. I have also observed a weird draw on a few c4's to be under the center arm rest. There is a connector, I believe a 4 pin connector with what looks to be a diode connecting I believe pins 1 and 4 and this diode fails and becomes a short to ground for power.
Both of the above mentioned sources for a draw come seemingly from the courtesy light circuit. But I would just like to point out that the courtesy lights are one of the things controlled by the ccm. Good luck. From what I have read here so far, the best thing you can do from here is find an electronic specialist with experience chasing gremlins in c4's. I am in South Florida.
