I really hate this HU... I have the Z2, bought it in 2007 cant get the 2 wire method to work. I have both those wires grounded, and I am like 99% sure they are done right, first thing that pops up is that parking wire warning. I had the VSS wire hooked up and thought that might interfere and it really doesn't make a difference. I tried updating they system using that bluetooth image and its not as current as what is already installed (I probably did it last summer).
Right now I am trying to change the background and have made so many disks that the sytem cant read. Seriously, finalize the disk (I understand that), Create pictures folder (Maybe, Lazy programmers), CD's have to be at least 100mb (WTF! [4 wasted cds before i found that out]), Still doesnt work, Hope its because origonaly I had spaces in the file names. Seriously, this is the least user friendly HU ever...
Sorry for the venting... If anyone has tips on the first issue that would be cool... I was gonna get the z3 disk from the user selling them but I got really broke....