I don't believe there are actual instructions for this unit. It is 100% separate from the Bose setup. Each DVD unit plugs directly into the black box, and the black box just gets a power and ground supplied to it. Very simple, very basic installation.
We mounted the black box under the drivers seat. The factory calls for it to be installed underneath the center console, but that was an absolute pain to get access to. Take the positive and run that to an accessory power and ground the black box to the seat bolt.
The rest of the wires are all color coded and just plug together.