There's an issue I've discovered now...I sent a message over to Axxess support and haven't heard back yet.
I have a 2008 Tahoe with Bose, nav, onstar, RSE, XM, etc. and recently installed a Pioneer 8500bhs head unit using the Axxess ADGM100 to retain all OEM functions. I have discovered that sound mainly comes through the front speakers with very slight sound coming from the passenger rear and even less volume from the driver rear. However when I push the power button on the RSE controls the rear driver speakers turn on and are much louder (strangely it seems the rear passenger volume goes down). I can continually change the rear sound on and off just by pressing the power button from the RSE controls. The overall sound in the vehicle is night and day better with the power button turned on on the RSE controls.
Also when I do have this turned on, every few minutes a strange buzzing noise comes from the rear cargo area, perhaps from where the amp is located. It almost sounds like an air compressor but it only happens when I push the power button on the RSE controls (which as explained above turns the rear speakers on much louder).
I am very certain we have all connections correct but I wanted to inquire to see if you’ve seen this occur before and what might be the problem.
Any help is greatly appreciated.