PAC RP3-GM12 Radio Replacement Interface for Select GM Vehicles without On-Star Radio Replacement Interface For Select GM Vehicles Without On-Star High current 10A accessory output Data controlled outputs for connecting to your navigation radio; speed, reverse and E-brake status output wires Retains factory installed amplifier Data controlled RAP accessory output High current 10a accessory output Data controlled outputs for connection to your navigation radio; speed, reverse and e-brake status output wires Retains factory installed amplifier (if equipped) Data controlled rap accessory output Keeps vehicle data-bus intact for service