This is embarasing. I just baught a 93 xj 4.0. The cruise does not work. I just discoverd a yellow box laying in the glove box labbeled AMC. A google search told me it was a cruise control module, ha. No wander the cruise dosnt work. I just cant find where it goes. Thought i would ask here i cant find a pic of the location.

 

I could be wrong but in my 89 it is right under the steering column screwed into the knee part of the dash. Will take pictures later