Hello and welcome to just answer. Let me see if I can help you with this. Oh man that is never a good thing to do. Reversing jumper cable polarity is almost certain "death" for many of the vehicle's electronics. You probably damaged the BCM and if you are lucky, did not damage other computers and controllers. If the engine still starts and runs, radio works, no warning lights on the dash like ABS,air bag, etc, and the cluster still works then maybe all you damaged was the BCM. If this fuse was not blowing before the mishap, then I am sure that you "fried" the BCM and it will need top be replaced.
I am sorry that this happened, and if you need further assistance, then please let me know and I will continue to assist you with this.
Well the best way to test both modules is by using a scan tool. Some auto parts stores will have a scan tool that can communicate with the modules. To be honest with you, I have never seen reversing the polarity cause any type of harness problems, and damage is usually only in the modules themselves, so I would not worry about any harness issues. As far as programming the modules? No. They both should be "plug and play" so to speak. Just be sure that they are ordered based on the vehicles VIN # XXX you should be ok..
Yes of course! One thing you may want to do to confirm that the short is indeed internal to the BCM, is to disconnect the connectors at the BCM, and then see if the fuse does not blow any more. Do you need the procedure for removing the BCM? If so, I can send it to you.
Wow, I have never seen this before, and totally understand that you do not want to accept. I will file what you found for future reference. Sorry that I was unable to help you with this problem.