oh gotcha. Yeah I don’t NEED it as I’ll still have remote start on the fob, but it’s nice before I leave work when my car is parked way in the back of the building and stuff.I tried but didn't take it too far to get it to work. I haven't heard of anyone having success to get SXM Guardian to work on a pre-2018 GC, unfortunately. I think it must be missing the correct antenna or something. I didn't dig too deep since I wasn't going to pay the monthly fee for those features anyway, but would be cool to have.