Thats not true. That blue plug is the IP-Buss plug. And pioneer has been putting those plugs on there just about forever. That plug is used for TV's, cd changers, ect. Yes the XM receiver plugs into there but that doesn't mean it XM ready. The head unit will say XM ready if it is. I dont think XM radios started coming out until 2001.TurboCat said:if you have any newer post '98 (I think that's the year) model with the blue colored plug in the back (for CD changer) then you have an XM compatible receiver whether it says so or not!