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2011 Kia Optima
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No, not common, but at least you know it's not the regulator/motor. The master control is sold as a unit so just one switch can't be purchased. You need to pull the door panel, remove the harness and then remove the switch.
Probably the switch, but with the switch out, might want to do some testing to make certain the switch is bad and not in the wiring. Take the switch apart and spray with contact cleaner, might get lucky.
 
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