Solved the mystery of the "black button"....when I had my fog lights installed, shop found that it was an after market alarm, (Brand was Automate, ever heard of it?), siren's gone, chopped wire at harness, cut wire to LED. Who would go through trouble of taking apart dash (which guy told me was a pain), chop out the alarm system?....Previous owner wanted to keep it before he traded it in? Guy also noted that several screws were missing to various parts in the dash....sounds like somebody took a shortcut when reassembling dash.

OEM Keyless remote arrives tomorrow, hope the OEM system still works!