PAC RP4-GM31 All-In-One Radio Replacement and Steering Wheel Control Interface for Select GM Vehicles with CAN Bus: * All-in-one radio replacement and steering wheel control interface * Pre-loaded with amp retention and navigation based output signals * Retains all important OEM safety and convenience features * Data-controlled RAP accessory output * Data-controlled outputs for connection to navigation radio and speed, reverse and E-brake status output wires * Keeps vehicle data-bus intact for service and emissions testing * Retains factory installed amplified audio system * Interface can be quickly updated if needed from the PAC website using a PAC-UP USB adapter * For select GM vehicles with CAN Bus