PAC C2RGM11 11-Bit Interface Radio Integration Adapter for 2007 GM Vehicles with No OnStar System Data-Controlled Rap Accessory Output Antenna Or Amplifier Turn On Output Wire Dimmer Or Illumination Output Wire Data-Controlled Rap Accessory Output Antenna Or Amplifier Turn On Output Wire Dimmer Or Illumination Output Wire Steering Wheel Control Output Wire Retains All Factory Warning Chimes and Audible Turn Signal Indicators