YES... add a adapter that gives you AUX input using RCA cables....
that is what I did ... think it is called a PAC PIE GM-AUX9 or something..
PIE = Precision Interface Electronics
plugs in back of radio and gives you 2 rca input cables...
GO to radio shack and buy RCA to Mini stereo connector doohickey.. and you are good to go...
I use XM2GO radio
Hit AUX on HU to listen to what ever you plug those cabels into..