I added the MOPAR seat heater kit to mine, but I don't know how to troubleshoot a broken one. Let me know if you need the instructions for taking the seat apart to get at the heating elements. I have a PDF of the instruction manual for my kit that I could email you.
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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