Have a Tarago, 1986 luxury edition. On the drivers side, to the right of the steering wheel and below the air vent is a panel which houses the rear demister switch. To the right of that is a square orange button. It sits in a diamond shape, and can be pulled out, but not removed as it has blue wiring attaching it to the car. Not sure what it does, and the previous owners knew less about the car than we do. Anyone know what it does?