So, tied the green parking brake lead to ground last night. Bypassed at this point by MMW, and grounding parking brake lead. When I first drove it after doing this, it gave me the parking brake lead is not connected properly error screen. I ok'd past it, and all seems to work just fine. I have not seen the error screen since. Full phone, full GPS, etc... Thanks for the input everyone.
Next on the list of topics to tackle:
1. Determine if I need to update the firmware
2. Determine if my 4S with iOS 7.0.3 will work with appradio functionality (Reviews on the appstore say DO N