I have the avic d2, i havent installed it yet. Am i correct in saying that i dont need to hook up my VSS wire and i need to ground my parking break wire and add a pin to the epmty slot in the harness and ground it and all my functions should work correctly while moving?

If i am correct in saying that, when should i make all of these connections? Should i do them on initial install, before ever booting up the unit for the first time? does it really matter.

thanks for all input

I have the D1 and during install I installed the unused blue power ant a wire into the empty plug in the upper corner, grounded the ebrake wire and did not install the VSS wire. Unit is working perfectly. I don't care about some of the other options requiring the VSS wire to be hooked up. Works as good as my bluetooth GPS unit I was using. And yes all function works while driving just fine - I have not tested any type of DVD playback however as I don't have an external unit hooked up yet.

what are the other functions that you dont care about for the vss wire?

I think they are related to the Vehicle Dynamics screen page -

I think that the VSS wire also keeps track of your speed so when you lose SAT signal as in a tunnel your nav system can still track your location.Also I understand that there is no reason to leave it off.The bypass works either way so your losing features for no reason.Correct me if I'm wrong anyone.Just going by what I read here. I havent done the bypass myself.

Yes, it is better to hook up the VSS wire. It improves tracking accuracy as well. Having it hooked up does not affect the bypass at all.