Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question
Ok, you stated that you stored it properly - this can mean alot of different things to different people. So I need to know if it was in an air controlled environment that was properly sealed against possible varmints getting into it, as well as if you had a battery minder hooked up so that the battery never went dead
Ok, parked that long with a weak battery and no battery minder has likely resulted in the BCM(body control module), which is what controls the various electrical accessories, either failing, or less likely but technically possible, losing memory. It is critical that the various control modules, including the BCM, dont go without power for extended times. Even when you turn your vehicle off, they are drawing some millivoltage for power for their memory.
You can try having the BCM reprogrammed using a Tech2 dealer level scan tool and software, but based upon my experience, it will likely end up needing to be replaced.
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