PAC C2R-GM11 Radio Replacement Interface for Select 2006-Up GM LAN Vehicles Gm 11 Bit Lan Radio Replacement Module. Retains Door Chime And All Warning Audible Tones Supplied From The Factory Radio. Does Not Work With Vehicles Equipped With Onstar. 12 volt acc output Keeps data in vehicle healthy Radio Replacement Interface for Select 2006-2008 GM 11-Bit LAN Data Bus Vehicles Provides Retained Accessory Power (R.A.P.) +12-volt output Provides accessory output, chime, and turn signal blinker sound Steering wheel control output wire for easy connection to any of PAC's steering wheel interface modules