Help with Avid-d3

[Geesevs]

I've been away from my car for about a year and half (Army) and now that I'm going back to my car I want to solve a issue. I have a Avic-D3 in my car but I need to get the wheel controls to work properly I'm guessing my harness isn't the right one.
What happens now is that when I hit the up/down etc changes both the Nav unit and the MFD. So if I hit up for the next song it will also go to the next menu option in my MFD, its really annoying. Any one know the harness or whatever I need to fix this? Also trying to find a Bluetooth to hookup to it so I can get streaming going. Any help would be nice.

Really I want to just get a RNS510 with all the fixings but I actually cant afford it now. So have to make due with what I have.