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Just had the same thing happen to my new pioneer system. My truck battery died because I was jamming to the new installation, and the system just suddenly turned off. I charged the battery and the unit came on all the lights menus and displays worked like normal but there was no sound coming from the speakers. I checked all the fuses in the truck but none were burnt out. So I remembered there was a fuse on the back if the unit so I had to pull the unit back out. I checked the fuse and it was fine. I unplugged the wiring harness from the unit, plugged it back in and IT WORKED so I'm not sure exactly what was wrong with it, but I suspect when I unplugged the harness it reset the unit. So maybe this will work for your installation as well. Not exactly a high tech answer but maybe it will help ya! Good luck
Do you have power going to both the red and yellow wires? The red wire generally goes to a switched power source and the yellow should be constant. Both wires need to have power going to them in order for the unit to work properly.
go back to dealer they is a code for your head unit sometimes they will give you the code for free, or you may have to pay for the code to unlock.anyway im 99 percent sure thats the fix good luck.if somehow you disconnect the battery or it goes dead,or someone tries to steal or unplug power to head unit its made to lock up.you might have the code in your paper work if you bought the yukon new.check threw all paper work or the manuel,you might find it there.email firstname.lastname@example.org let me know how you made out.
here is the wiring code for you stereo,if that is what you need,batt constant-org.acc.yellow,ground-black/white.illum-brown.dimmer-gray.speaker wires,RF-+light green,-dark green,LF-+tan,-gray,LR-+brown,-yellow,RR+dark blue,-light blue.i hope that helps you if you have other questions go to carstereohelp.com.
The iPod will stop itself from charging when the battery is full, and will not overcharge. I'm pretty sure you can't disconnect the power to the iPod (would stop it from charging) and still use the Audio to your stereo.