PAC RP4-GM11 All-in-One Radio Replacement & Steering Wheel Control Interface (for Select GM(R) Vehicles) All-in-one radio replacement & steering wheel control interface Preloaded with amp-retention & navigation-based output signals; Retains all important OEM safety & convenience features; Data-controlled RAP accessory output; Data-controlled outputs for connection to navigation radio & speed, reverse & E-brake status output wires; Keeps vehicle databus intact for service & emissions testing; Retains factory-installed amplified audio system; Interface can be quickly updated if needed from the PAC(R) website using PAC-UP USB adapter; For select GM(R) vehicles