Auto door lock

Hi,

is there any aftermarket blackbox that I can buy, that my 91's PA have auto door lock if I set the transmission to D?

And also remote door lock transmitters?

Don't your auto locks work at all ? If they do, I think there was some trick to activate the anti car jack feature.

Don't your auto locks work at all ? If they do, I think there was some trick to activate the anti car jack feature.

My regular door lock are working.
In my Buick there was a aftermarket Blackbox installed, but I had to remove the box becuase after battery replacement I cant turn off the car alarm, and the car wont start.
Where these Box was installed the auto door lock worked if I shift to D. So I was wondering if I can order this blackbox with remote transmitters.
I read about to activate the auto door lock in owner manual but for 93 model, this is not working for me.

I thought the anti car jack feature to be standard from 91 and on. I also have a 91 base model and it works. But I think I read somewhere on this forum you can put it on and off with some kind or trick. Put the car in ignition and then do something.... I don't remember but I'm sure someone here knows it.