Does the TM4000 radio on 1992 Previa you have a if so where is it I tried another working but will not work Previa?

There would be no TM4000 radio in a 1992 Previa. The TM4000 radio was introduced in various Toyotas in 2011. So, unless someone installed an aftermarket TM4000 radio, the 1992 Previa would not have had that specific radio model.