Apparently there is a TCM back behind the glove box somewhere. How do you get to it? Or, perhaps, how do you take the glove box out? If I can get that out, it would probably be pretty easy to get to the TCM.
The main thing the TCSM does that I know of is to toggle OD. The black box is about the size of a large pack of chewing gum. It has a white sticker with black numerals for the part number. It's a 5 wire affair in a 6 pin connector.
Even Jerry W. told me that they are just used for the OD light, and you really didn't need it, but guess what, the tranny had major issues with OD when it was not there. I've seen this on a couple of swap cars. So you really do need it.
i'm guessing it is that white thing behind the trunk release switch. am i right?