H3 Accessory wire by the radio

[jrbnc]

Hello,

I am installing a sirius sportster4 and I have hardwired a cigarette power adapter from radioshack using the orange and black wires on the back of the radio harness. This obviously is always on due to the orange being a constant hot, but i would like the sirius unit to turn off with the key.

Does anyone know what wire is the accessory wire controlled by the key, which I can connect to instead of using the Organge one?

Thanks,
Josh

Car is 2006 H3 with the most basic stock radio, no xm or 6 disc, or nav, or even mp3 player.