I have the iSimple also and it works well. Definitely nice to have the bluetooth functionality. I also installed the factory GM USB jack in the dash and connected that to the iSimple. There are a few bugs that causes the menu to act funky on occasion but overall its a nice unit.
Has anyone been able to resolve this issue? I have the same problem on my 2008 Yukon Denali. I don't use the nav much, but the clock setting back one hour is pretty annoying. It does that after every power off. I just took it to my local dealer and they told me that the radio has 11 error codes...
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