Dice needs to update their instructions as I had the same problem.

It's in the rear left access area in my 07. try looking there - it's weher the nav system would sit. Also on mine the cable wasn't hooked to the rear of the stereo so I had to pull it out unplug what was plugged in and plug the cable in. Everything still works - bluetooth too. I think it's hooked up for sirious from th factory. good luck