I have a 2009 tahoe z71 fully loaded with an aftermarket kenwood stereo. The problem I'm having is the rear door speakers and rear pillar speakers randomly stopped working. Ive tried putting the factory radio back in. I've checked all the fuse I think would cause it. I tried disconnecting and reconnecting my battery. I tried replacing those speakers and even put in a brand new oem bose amp, all with no luck. If you have any ideas on how to fix this please let me know