I agree that it is useful but not needed for this installation.I have the same setup and I love it. Still need to paint match the doors, but it's nice to be able to lock all the doors with a single button; which isn't perfect but at least your car alarm is armed when you're out on the town.
FOR ANYONE THAT WANTS THIS SETUP: I can't tell you enough that you need to go to Mopar Tech Authority and get the Factory Wiring Manual (and the Factory Service Manual while you're at it). Some may groan about a $200+ purchase for manuals but it will save countless hours of looking online for connector types/part numbers, wire gauges, pin-outs, diagrams, etc. and it will save you money because you're confident that you didn't take a leap-of-faith before you ordered the wrong part. Time is money. There are some really good vehicle illustrations, that are better than any I've ever seen online, of where everything is located. You can also literally get the part number for the manufacturer that made the connector, so you don't have to pay the 4000% vehicle OEM markup.
The one drawback of the USB stick for the manuals is that when you start using it, it's programmed to knock out your internet connection and override a lot of your computer functions to protect the data. I run the manuals on an old spare laptop so I can use my daily laptop to actually search for things online, like where to buy stuff. Rant over and out.
In its simplest form you need this pinout if you can't pull wiring harness from a wrecker's yard.
You need pins 1, 2, 4, 8, 9, 10, 11, 13 and make a harness. You'll need to modify the harness that comes with the doors (for door ajar sensor) and the correct 14 pin connector that also comes with the doors.
You'll also need the right size pins for the connector.
You don't need the door lock switch and I set my PCM using JScan to auto lock doors. They lock at around 30km/h
|1||P910||18||TN/YL||FRONT DRIVER DOOR UNLOCK|
|2||C110||20||DB/LB||MIRROR HEATER DRIVER|
|3||E12||18||OR/GY||PANEL LAMPS DRIVER|
|4||G75||20||VT||DRIVER DOOR AJAR SWITCH SENSE|
|5||G161||20||VT/DG||LEFT DOOR LOCK SWITCH MUX|
|7||Q11||14||OR/LG||DRIVER WINDOW DRIVER (UP)|
|8||P930||18||TN/WT||FRONT DRIV DOOR LOCK|
|9||P71||20||TN/DG||DRIVER MIRROR VERTICAL DRIVER|
|10||P75||20||TN/OR||DRIVER MIRROR HORIZONTAL DRIVER|
|11||P76||20||TN/LB||MIRROR COMMON DRIVER|
|14||Q21||14||OR/WT||DRIVER WINDOW DRIVER (DOWN)|