I picked up a Pioneer AVIC-F700BT, it was a deal so it was missing the preamp wire harness. There are times when you find a cheap car stereo missing a few accessories (thats as much as I'll say about that). When you do, you'll need a wire harness. I thought it would be helpful for certain people to write a how-to on making your own.
Step 1: Starting out
This is the port that we need a harness for. It has 12 pins and handles the preamp outputs of the stereo for connection to an external amplifier. The harness for it would come in the box if this unit was bought new.
The first thing you need to do is find the pin-out diagram to tell which pin handles what function. These things are available all over google for whatever port you might find.
What else do you need: Soldering iron, glue gun, continuity tester, shrink wire, port connector, female a/v jacks
Step 2: Understanding the pin-out
I found the diagram for this stereo on some forum. Since I'm making my own harness I have a choice which features I can live without so i got less soldering to do.
Here I'm going to use the six audio channels, the amplifier remote wire, and mute wire
Right now I'm ignoring the rear view camera and video hookups.
Step 3: The connector
In the first image is the original connector, it had like 100 pins i think. You can get these from all kinds of catalogs like Digi-key, Allied or Radio Shack. I cut it down to 22 pins (not 24), it fit better so in the last pic you can see the two pins exposed. These handled the rear view camera so I didnt need those. But as you can see this fits perfectly and now we're ready to solder some wires.iption of the Step