Installed the head unit about a week ago...worked fine for about 2 days while I was installing the rest of my system in my 04 Silverado. Now, the head unit just stays on...keys in or out, it does not matter...the head unit just never turns off, the only way I can turn it off is to unplug the big black power plug in the back. Also want to add navi and system settings are greyed out. I checked all ign and batt wires and didn't see anything wrong or shorted out but I'll admit I look over a lot of stuff so can anyone just point me in the right direction? Thanks, Kevin.

Sounds like your interface module went bad. -

Navi is greyed out until you apply parking brake. Search for bypass.

those modules f up all the time