2012 Chevy Impala
 

I have this 2012 Chevy impala. And we wanted XM radio. But come to find out it had an xm antenna but no xm box. I have got the Xm box and now it says XM theftlocked. The dealer will unlock it for 80$ but I don't wanna pay that. Is there away like disconnecting the battery or unlocking with pressing some buttons on the radio? Thanks Marcus.