Installed pioneer dxt-x2769ui/4speaker bundle a month ago.. worked fine til yesterday. Radio on everything fine. Then instantly no sound at all. Radio was still on like nothing happened. Lights... cd playing.... digi eq pulsing... just no sound. Turned radio off and back on... heard a click in the speakers but nothing else.... any ideas? 
You likely have a bad speaker or shorted wiring. Aftermarket radios shut off the outputs when a short is detected.
SOURCE: power will not stay on
Sounds like you're not getting voltage on the accessory power lead. This is the red wire at the back of the deck, and it supplies power whenever the key is switched on. It's possible that your vehicle's radio fuse is blown.
SOURCE: OWNER MANUAL
everything is controlled for the radio by the little remote. the top right has a source button. press that button a couple of times and watch the screen as you do.
SOURCE: Chevy Tahoe radio wiring problems
I had the same problem and here's what fixed it. By default, I did not connect the blue/white striped remote wire to the harness. Apparently there is an amp somewhere in the vehicle I did not know about. After looking at the factory wiring and the aftermarket harness, I noticed that the remote wire was used and I connected it with the remote wire on the harness and everything came up and worked perfect.
SOURCE: no sound from cd but stereo works no problem
there are 2 blue wires........dont hook the blue to blue!!!!!!!!!!!!!!!!!!!!!! hook blue to the blue/white wire!!!!!!!!!!! problem solved. so e-z huh? lol i did the same thing.
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