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The PAC RP3-GM11 Radio Replacement Interface for Select GM Vehicles without OnStar is for GM vehicles with Class II data-bus and 24-pin harness. It has a high-current 10A 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 R.A.P. 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. Includes RadioPro3 module, plug & play vehicle connection harness & instruction manual.