Axxess GMOS-LAN-09 Non-Amplified OnStar Interface For 2014 Chevrolet Silverado 1500/GMC Sierra 1500 Non-Amplified OnStar Interface For 2014 Chevrolet Silverado 1500 and GMC Sierra 1500 Provides accessory (12 volt 10 amp) Retains R.A.P. (Retained Accessory Power) Used in non-amplified systems or when replacing amplified systems Retains chimes: Adjustable volume for chimes and OnStar