Hello Denali24, Have you checked through the navigation manual as well? It shows on page 14 that you should be able to just press the power button for the radio to turn that off and if you hold that button it will turn off the navigation as well as the rear seat entertainment system as well. Let me know if this helps.
I read that if you push the volume on off button it shuts off the radio and everything including the navingation. But what if you want to shut off the radio and keep the navingation on?? How do you do that?
When you just press the power button for the radio it should only turn off the radio. If you hold the button then it would shut down the whole system. That's what I gathered after reading the Navigation Manual for your vehicle. If you'd like me to investigate this further I would need your VIN. I hope this helps Denali24.
The VIN # on my Denali is 1GKKRTEDOCJ191787 , On our Denali one push on the on /off knob turns off everything, radio and the navigation, any help you can offer would be appriciated, thanks.