The RP5-GM31 interface allows the replacement of a factory radio in select General Motors vehicles with 29 Bit Data-Bus. Using this interface will retain factory features such as Warning Chimes, Bose Amplifier, Steering Wheel Controls (SWC), Rear Seat Entertainment (RSE), and Rear Seat Controls (RSC) when the original radio is removed. The RP5-GM31 provides data bus-driven outputs such as retained accessory power (RAP), vehicle speed signal (VSS), illumination, reverse trigger, and parking brake.