PAC AAI-GM9 Auxiliary Input For GM 9-PIN Auxiliary Input for GM 9 Pin Connector behind Radio Plug and Play to Factory Radio Gives Direct Audio Input to the Factory Radio Can only be used in vehicles equipped with a factory slave unit (external CD player, or external single CD player Auxiliary Audio Input Interface for 1995 - 2002 GM Vehicles Allows Direct Interface of Any Pre-amp Level Audio Source to a GM Factory Radio OnStar Ready. When OnStar is Initiated the Auxiliary Audio Inputs Are Automatically Over-ridden to Allow OnStar Audio to be Heard Higher Quality Sound Than an FM Modulator Completely Plug and Play. Requires No External Wiring