I know I'm tagging and should not. OK THANK YOU! Chevy of Bellevue WA quoted me $832.50 to replace it.You think you can change it easily, but probably not...
The Sirius module is behind the passenger front kick panel, up a little high. Yes, you could remove it. No, you cannot find a Sirius module to plug in to replace it.
1) The communication between the XM tuner and the head unit is unique to GM. There is no GM-specific Sirius tuner available.
2) You would have to change the antenna even if you could plug into the existing harness. XM and Sirius operate on different frequencies, and the antenna for one won't work for the other.
There are ways that you could make an aftermarket tuner module work, but you would not be able to control it through the head unit. If you switched to an aftermarket head unit that has Sirius control ability, you would still have to install a new antenna, plus all the adapters and accessories if you want to retain warning chimes, OnStar (if equipped), and the Driver Information Center.
I too have a bias towards Sirius, and it was almost strong enough for me to avoid GM altogether, but I got the G6 for less than half of the other car I was considering. The thing that killed the deal for the other car is that no one in the western US had the car I wanted with the nav system, so back to Pontiac I went.
I been looking for new or used radios! Now see it's not the radio needs replaced. OK found work order here is what it says. Here a pic I uploaded to see what it says. Is that the RADIO or the SIRIUS XM MODULE?