In '95 the max was only partially OBDII, they were working on switching it for the '96 which is why it's in a wierd place. I seem to remember hearing that is was somewhere near the passengers feet, but I haven't actually needed to look for it. If you are unable to find it and are just trying to retrieve the codes, here's how
http://vbxmaxima.8m.com/ecu.html.