Allows installation of an aftermarket radio using the existing factory wiring and connectors GM non - amplified, non - onstar interface harness. Retains chimes and accessory through an on board speaker 2005-2006 Chevrolet Equinox and Pontiac Torrent Retains chimes using on-board speaker Retains RAP feature The GMRC-05 is designed for use in 2005-2006 Chevrolet Equinox and Pontiac Torrent without Onstar. The GMRC-05 provides +12-volt accessory output and retains warning chimes through the use of an on-board speaker.