I have a 2012 JKU Sahara and mine does something similar, whenever the interior dome light turns on. I think it's the air duct door actuator gears are jumping/skipping. Any idea on how to fix it? Mine also makes other sounds underneath the dash on the passenger side like vacuum vents hissing/gears or something is moving under there even while the ignition is in the off position. I've gone through 3 batteries in 3 years, hopefully my 4th battery which is duralast platinum will last longer than a year.