Not too long ago (maybe three weeks or so) I read a tip on here about installing LEDs in the cup holders. The poster explained exactly where the plug was located under the center console and which pins where the power and ground. The wires he or she pointed out were only "live" when the headlights were on, and they were controlled by the dash dimmer. I've searched, but I cant find that thread. :(

http://www.scionlife.com/forums/viewtopic.php?t=29238

Hope this helps :!:

Hmmm...that's not the post I was looking for, but there is a lot of good info there. Thanks. I'd still like to find that specific post because it uses an existing plug with power and ground which is controlled by the headlight switch.

I found it!
http://www.scionlife.com/forums/viewtopic.php?p=386025&highlight=cup+holder#386025