Check the listing for details. PAC RP3GM11 Radio Interface for Select 2000 - 2013 GM Class II Vehicles. Condition: New. Listed at 82.78 USD. The PAC RP3-GM11 Radio Replacement Interface for Select GM Vehicles without OnStar is for GM vehicles with Class II databus and 24-pin harness. It has a high-current 10 amp accessory output as well as data-controlled outputs for connect to your navigation radio—speed, reverse and E-brake status output wires. It retains the factory-installed amplifier, if so equipped. The RP3-GM11 has a data-controlled RAP accessory output, a plug-in connection for steering wheel control SWI-RC or SWI-X and keeps vehicle data-bus intact for service. The chime volume is adjustable with four levels and off. The interface can be quickly updated if needed from the PAC website using PAC-UP USB adapter. High-current 10A accessory output Data-controlled outputs for connection to navigation radio—speed, reverse & E-brake status output wires Retains factory-installed amp (if equipped) Data-controlled RAP accessory output Keeps vehicle databus intact for service Plug-in connection for steering wheel control module (SWI-RC or SWI-X) Adjustable chime volume: 4 levels & off Interface can be quickly updated if needed from PAC® website using PAC-UP USB adapter Includes RadioPro3 module, plug & play vehicle connection harness & instruction manual For GM® vehicles with Class II databus & 24-pin harness