I had nothing but trouble with 3 different Axxess units and eventually switched out for a PAC unit which has worked flawlessly for over a year (both connected using the same customized Metra harness). I have a Pioneer 4100NEX so pretty much the same setup as you. I think the Axxess stuff is less forgiving of resistance anomalies in the splice points. The PAC unit is manually programmed only, no auto programming option, and I think that helps as well, but that's just a guess.
The Axxess directions describe how to manually program the unit as well, which might help in your case (didn't in mine...) - they should have been included with the unit but if you don't have them you can download them from their web site.
The Axxess directions describe how to manually program the unit as well, which might help in your case (didn't in mine...) - they should have been included with the unit but if you don't have them you can download them from their web site.
) then you should have no trouble wiring the PAC in its place and getting it set up. After installation it takes about 5 minutes to program, unless you mess up a step, then you have to start again. But once it's programmed it's done, or at least mine is - as I mentioned before it hasn't hiccuped even once since I installed it well over a year ago, maybe going on 2 years...somewhere in there... I keep mine fairly accessible as well just in case (I had to futz with the Axxess units all the time so I was paranoid about the same with the PAC...) but I haven't touched it since the install. Plus it's less expensive than the Axxess. For me it was the solution to my months-long steering control issues, maybe it would work for you too. Might be worth a shot.
