I recently started having problems pushing the rear AC button on the panel so I decided to order the part. After a few tries at the dealer, I thought I got the right button. So I proceeded to try to put it in. Come to find out that the actual button is soldered on the electronic board. So ordering the button wasn't the solution. In finding out about the button soldered on the board, I noticed that in the row of soldered buttons, there's one that is not being used because on the main dash it's just blank. Does anyone know what this button is used for. I was thinking of switching the soldered unused button for the rear AC button. (OR get the outer button and replace the blank button if that button is another option that I wasn't aware of). Can someone shed some light on this? Thanks