I drive a 2011 3GS and added an LS 460 backseat armrest. The armrest from the LS has a sunshade button from its original car. Being that my GPS has a sunshade stock with an original button could I tap in to the wiring anywhere to make this button functional. Like the experience of you doing your sunshade this was an experiment I have myself. Haven't seen this done anywhere yet that I can find!