I should mention that I tried to install the unit myself. I followed the instructions to a T, called up my electrical engineering brother to ask for assistance, and I got the same results as my installer buddy. I thought I had fried the unit or something. I needed to purchase some converter cables (GMOS-04) in order to connect the new radio in. The culmination of all the necessary cables was so tremendous I was not able to find a way to easily store all the cables behind the radio.
I have a different Eonon model my friend installed and everything seems to work... except the sound. I had purchased a GMOS-04 to provide the right conversion connections between the car and the new Eonon radio unit. I let my installer hack away at the GMOS-04 wiring (against my better judgement; that's another story for another time); he thought that the unit was superfluous and attempted to hard-wire the radio in. It didn't seem to work.
So now, I'm left with my old radio and a unit that only sort of works. I will most likely put the old one back in. There are other problems with the Eonon for our Yukon. The screen that does the fancy slide out and turn up will run into the shifter when it's in the park position. There is a cavity currently occupied by the multi-disc changer that we rarely use; installing the radio there would be better in terms of avoiding mechanical collisions. I will try changing a couple of things, but in the end I imagine I will end up going to Best Buy to purchase a GPS and ask for someone to install it for me. I just don't have the time or interest to deal with these issues myself.
