1988convorx7

Well, i'm dumbfounded by this new development my rx did today. I had to put in a new combination switch last year (cause of my wiper switch/ and top switch problems). This had seemed to fix all of my wiper and top switch problems till today. I got in my car (with the car at idle, E-brake set, Windows down) My top won't go down. It doesn't even trip my little alarm, however, when i turn the switch to put it up, it works pefrectly fine.... I don't understand it.... I checked my switch and it checkes out okay, and I can't find the diag port under the hood.... I know where it should be but it cant find it. Need some serious help please.