PAC Vehicle Wiring Interface for Select GÇÖ04 GÇô 09 GM 11-Bit without OnStarThe PAC Vehicle Wiring Interface is a wiring solution designed for select GM models from 2004 to 2009, featuring 11 Bit systems without OnStar. It provides a dedicated path between your vehicles wiring and aftermarket components to help maintain reliable operation and clean integration in compatible GM models. Compatibility: Works with select GM vehicles from 20042009 that use an 11 Bit system and do not have OnStar. Brand: PAC Vehicle Wiring