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take a volt Ohm meter to either side of one wire then do the same for the other, if the ohm's dont give you a steady reading then the iwre needs to be replaced.
If you haven't already check all your fuses and the flasher relay.
Its probly your switch on your if it dont light on you will need to change it. Its easy to do and I think the part is under $20
some do some dont most dont
Check your fuses
go here, all the info you need to fix it yourselfhttp://www.jeepforum.com/forum/f13/heated-seats-dont-work-335374/
look at the fuse panel or owners manuel it should tell you
Check your fuses.
if you dont know this your an idiot
its a common prob... I dont know why this works, but try to disconnect the yellow wireconnections under the front seats, then connect them again, and now it stops. I found this solution on a homepage for british mondeo lovers (!) - i dont know why it works but it did for me...
i dont no
never heard one that didnt, but i suppose you dont HAVE to