Ok, here's an overview of a ready-to-go Connects2 harness.
And a close-up of the ends we'll be working with after cutting off the two DIN plugs and adding bullet connectors:
Connects2 and Pioneer (and everyone else for that matter) uses CEA standard color codes for the common wires so you'll need:
Yellow - +12V (battery)
Red - Accessory power
Black - Ground -
White - Front Left positive
White/Black - Front left negative
Gray - Front right positive
Gray/Black - Front left negative
Green - Left rear positive
Green/Black - Left rear negative
Violet - Right rear positive
Violet/Black - Right rear negative
Orange (with no tag) - Illumination
Orange (WITH the tag) - Reverse Ger
Green (WITH the tag) - Speed Pulse
Pink - Muting (You won't need this)
Blue - Radio on control wire/booster (I'm not what this one does as I didn't use it and neither will you, but I'm thinking remote turn on from the OEM HU.)
These wires will match up color for color up until the last three (green w/tag, Pink, Blue). You can use bullets like I do (I change radios a lot), butt connectors, or solder and heat shrink. It's up to you.
The small black 14-pin plug goes into the CAN-BUS decoder.
If you purchased the Pioneer steering wheel control adapter then the small 12-pin connector on that connects to the other side of the CAN-BUS decoder.
This end will plug into your Pioneer (if you purchased the steering wheel control adapter)
At this point you'll have mated the Pioneer harness with the Connects2 harness and it's all plug and play from there.