Long time lurker, first time poster

Took delivery of my '07 2.5i the other day, and last night noticed something rather trivial - the illuminated cup holders, well, arn't illuminated.
Nothing (useful) in the manual or in a forum search about it, so I was wondering if anyone can tell me if there is some special set of circumstances that have to combine for the cupholder illumination to kick in? Or should they just be on when the lights are on?
I had the Aux jack installed so I wonder if they stuffed something up when running that in.
Thanks in advance!