I don't have a wiring diagram, but I imagine the extra wires are for the airbag sensor. The Jeep can assess how much you weigh and determine how forcefully to explode the airbag in a crash, or not at all if someone isn't sitting in the passenger's seat. There may also be seatbelt sensors in that wiring harness, as well as power to active head restraints, although my '08 doesn't have those. The 6 way power adjustment on the seat is probably wired in there too, even if the Jeep didn't come with that option. Good luck!
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997