Basic schematics for OBD0 Wiring OBD1 Basic wiring Schematics. BONUS!!! Engine Bay Splice Diagram! OBD2a basic wiring schematics OBD2b basic wiring schematics Hope this helps, most of the questions are answered here. I just used the diagram and did my own wiring, so its pretty accurate. All pics taken from Pheerable.net. It is hotlinked atm, I dunno if that is an issue, but I will post the pics on a image site if deemed necessary. I just don't know the site's rules against hotlinking.