If I thought there was much of a chance that anyone could answer this question, I would have posted a new thread, but I still need to ask and hope. I'm still trying to figure out how to best deal with the problems associated with the Body Control Module on my Blazer, and after looking at the manual, it appears that the module must be reprogrammed, either as a troubleshooting step or after replacement of the module or possibly other components in the system. Looking at the required tools for this procedure in the manual, it looks as though most could be done using other generic tools, but there is a scanner/programmer called a 7000081 Tech 2 Kit listed, which cost ~$3200 from GM. Obviously, neither I nor most owners could afford such a tool.
I called AutoZone to see if they had a generic tool that could do the job, but they really didn't know what I was talking about. I then called O'Reilly's, and was pointed to another store of their's here in town, where the programming could be done cheaply. However, after talking to that location on the phone, I'm not convince that they would be able to help either, because what they would program is something called an ECU, which apparently is the main computer in the vehicle, which would have to be removed and brought to their location.
I just got off the phone with a local Chevy dealer's service dept. and learned learned the cost of having a diagnostic performed ($98), which isn't too bad, but the service rep thought that it was very likely that the BCM would have to be replaced, and if so, it would cost another $250-$300 for the module, which is a bit much, especially since I have a number of other expensive repairs being needed. I can't use a used module, because I was told that once the VIN is programmed into a module, that it is there forever.
With the cost factor, it appears that my only choice at the moment is to either forget about that repair for the time being, or hope that someone might know of a cheaper shortcut to solve the problem. I would mind postphoning the repair, except that currently I can lock the tailgate. However, that might be due to an additional problem besides the BCM, because the lock will not turn, nor the button depress, even using the key.
As I said, I doubt that anyone can offer a precise usable answer to the problem, but I'm keeping my fingers crossed.