First of all, hello from a newB. I bought myself an 09' Scion Xb a week ago as a Bday gift and my best friend (like a brother) gave me a D2 unit as a gift for it also.

This D2 came out of a strict show car. It is in perfect condition! The wiring isn't so perfect. I did notice when we took it out that he didn't have the VSS wire connected to his car and he also didn't have the reverse wire connected however, his navigation worked perfectly.

Is it possible for it to work w/o it? Or was he just lucky it worked?

His vehicle dynamic displays worked perfectly also........will all that also work w/o this stuff being connected?

Hope to get some help from you all and thanks in advance......this sight is great!

It isn't needed, but the VSS wire gives the unit a more accurate reading than without it. And the reverse wire is only needed if you're hooking up a rear view camera.

Oh......I see. Thanks for clearing things up for me.