and Country Radio? Hey all,

So I'm getting ready to install a new radio in place of the stock radio in my 1998 Chrysler Town and Country Minivan. This minivan is equipped with the infinity sound system. When I pull the radio out I recognize most of the wiring. I see two standard wiring harnesses, a ground strap, an antenna wire, and an extra ground wire for the infinity system, but there is an extra plug on the opposite side of the radio as the antenna female plug. Its a two wire plug and I haven't seen it mentioned on installdr or modified life. Does anyone know what this if for?