Its look like their is some electronic problem with it so i advise you to visit the link as i got my jeep solution from this site http://toolsnyou.com/
SOURCE: 2005 jeep grand cherokee radio
It's in the engine compartment IOD#2. It's a black module with two fuses in it. Take that module off and replace the 20 AMP one.
SOURCE: 1995 Jeep Grand Cherokee - Setting the clock on the NAV radio
go to system settings from main menu you will see clock settings option
SOURCE: Dashboard Gauges stopped working on '96 Jeep
If you wired anything into the fuse panel, check those fuses first. You can test all of them with either a test light or meter without removal. Just probe into the cavity at each end of the back of the fuse. Sometimes it matters which side of the fuse you used to supply power (dosen't make sense but I had that happen a few weeks ago). If fuse is not blown take power from the other end of same fuse and see if it works. If you did blow a fuse, try another connection source. I can't tell you which fuse because I don't know what you tapped into.
SOURCE: I purchased a 2002 Range Rover Borrego recently.
I have experienced many electical demons with all my British cars. The nav units can and do fail. I had a goofy one this summer and the only way it got fixed was to replace it. The module not the head unit
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