I drive a Lexus rx 330 2006 model. I would like to know what this button is for. It is inside my glove box and no it is not for my powerdoor. I have included both pictures of the powerdoor button and the other button I don't know what the name is or what it is used for.

 

Somebody added an FM Transmitter, perhaps for use with an iPod or other audio player. The selector switch sets the FM broadcast frequency. Where does that cable run to?