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Good question. I'd like to know why also. Mine went out mysteriously too. The dealership replaced under warranty. I never did ask what the cause was. I'm wondewring how common this problem is
I had the opposite problem with mine. The battery went dead while the car was unused for a few days. I dis-connected the battery and charged it. When I hooked it back up and started the car, I could hear something running under the seat. It turned out to be the lumber air pump. I started taking the side trim off to get to the switches and it stopped. I imagine it is only a matter of time befor it happens again.