cannot scan it because of no communication?

First make sure the scanner works on another car. Next check the OBD fuse under the hood. Here is a guide to help you with the fuse location and the wiring diagrams for the ALDL so you can see how then system works:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken