I would say fold the carpet back,, reach to the top under the dash fold down the carpet ,,remove the three plastic nuts from the metal cover,,lift and fold down the metal (form holder) toward the seats the tcu is 5"x 4" black box 1/2" thick,,, if the wires going into the tcu is wet with tranny fluid that is a no no. dry it open it dry it clean it remove as much tranny fluid from the wires,,, go to the tranny replace the elect coupling put everything back and try it. jim