i had pulled apart my dash to pull out my light switch to replace it and found this random wire hooked to something with a blue cap that you can see if the ash tray is removed not sure if it is an alarm light or what it is when trying to follow the cord looked like it went into a different light but had to run to work not fully sure what it is here are some pics i snapped before work ..

 

wll light up the ash tray when lights are one at nite so you can use ash tray