I had a Z-2 installed in my H2 with the bypass done, everything works fine, then awhile later my steering wheel controls for the volume and the track control stop working. Everything else in the unit is fine, took it to my installer and they said that the computer in my vehicle might be going bad so I took it to the dealership and told them about the same problem and they said that since it was an aftermarket radio installed they would have to put the stock radio back in and test it to see if it was the computer. Has anyone else had this problem before and what was the solution?

http://www.avic411.com/forum/viewtopic.php?t=10642

http://www.avic411.com/forum/viewtopic.php?t=11409

I'm guessing it's a GM thing...I still have yet to figure it out, and have been dealing with it, as sometimes it'll work fine, then all of a sudden it won't. I haven't seen any pattern to it really, it just has a mind of it's own...