on the main wiring harness that has the power, ground, speaker wires, power antenna wire. etc. there should be a light green wire. the light green wire should be connected to the e-brake or ground if you want to bypass it. when you go to the link I posted click on "Installation/Connection Instructions" under where it says manuals. it'll open a pdf that you can save or print for a hard copy.

The instructions don't say what the cord assembly is, so I am only guessing that it may be the main harness, your audio/video inputs are rca connections, like $4 at walmart. the screen locked is from it not getting the right signal from the e-brake wire( light green).