Originally Posted by Mark Paul
There must be a way to check on the screen the version of the navigation model.
It's very easy to tell which model of radio is on a specific Grand Cherokee. The radio sales code is on the lower right corner of every radio:
RES = Media Center 130 (AM/FM/CD/MP3)
RBZ = Media Center 430 (touch-screen, no navigation)
RHB = Media Center 430N (touch-screen, Garmin navigation)
RER = Media Center 730N (touch-screen, Harmon navigation, discontinued)
RHR = Media Center 730N (touch-screen, Harmon navigation, not out yet)