1991 eighty-eight keyless entry

I need some help on finding the receiver for the factory keyless entry and advice on how to make it work again. I have had both of the transmitters tested and they are working. Does anyone know where the receiver is located and what it looks like. I think that it may be under the right side of the dash from what info I can find, but I want to be sure.

Have you followed the remote reprogramming procedure?