Have you ever wanted to use a spare switch in the button bank to power a 12 volt circuit? The switches in the button bank are intermittent and in order to avoid programming the SAM to convert a switch to a true on/off circuit all you have to do is patch in a latchable relay. See this link to ebay. Hot 12V 1 Channel Latching Relay Module with Touch Bistable Switch MCU Control | eBay The evilution site describes how to disassemble the button bank and provides a wiring diagram for the button bank. I used one of these relays to power a wind up key on my wife's Smart. Smart simply paints the button bank black, so using my Dremel I was able to scratch/slightly grind the paint off the switch to make the windup key icon. Now the factory LED light in he switch lights up the icon! Here's a link to my youtube video of the windup key. The video also shows the button bank in use.The next circuit I'm going to power on my Smart is a pair of Angel Eyes and the fog lights. Enjoy!