Taken from the Hellcat Wiki and my previously provided info:
http://www.hellcat.org/wiki/?title=Helpful-Tips-and-Tricks
11) Engineering mode: You can access an Engineering mode within UConnect that allows you to view numerous items.
Disclaimer: We do not take responsibility if you break anything while in these screens! In order to access, hold both driver-side temperature buttons at the same time for 5-7 seconds and the menu should open.
12) Dealer mode: You can access Dealer mode within UConnect. This is typically used by service technicians. For non-navigation units you can activate Navigation IF you have the 15-digit code that is generated elsewhere. Sorry, no free Navigation upgrades.
Disclaimer: We do not take responsibility if you break anything while in these screens! In order to access, hold both driver-side temperature and front defrost button at the same time for 5-7 seconds and the menu should open.