Where is my XM Tuner?

[CBR]

Hi Everyone,

I just picked up a 2006 4runner (love it so far), but as a stern junkie I need XM or sirius.

To my surprise, i found that my car has XM, but the antenna is broken. The antenna is on the roof, runs through the back passenger light and too.....

Where is my XM tuner?

Its not under any of the seats or in the rear cargo compartments and I looked every where obvious (without getting tools out i'll do that this weekend).

Would it fit behind the radio?

Thanks!
Chris