PAC AB-GM12 Auxiliary Audio Input for GM Vehicles Designed For Gm Vehicles That Have The 12 Pin Connector Behind The Radio. Must Be Used With The Ipac-Oem Or Aux-Box Add iPod or auxiliary to factory system Plug and play Auxiliary audio input for GM vehicles for factory radios that have a CD changer &/or XM controls. For factory radios that have a CD changer and/or XM controls