inputs.text: check nissan model wiring making connections - standard nice harness aware depending nissan model wiring positions use wires different example wired 2005 altima mid level radio trim black wire marked ground adapter actual vehicle speed signalvss feeds dash particular model worked uses chassis ground radio no ground even available factory wiring connections also harness adapter illumination switched wire onof headlights no pin connect illumination dimmer wire adjustable dimming factory harness ended pulling amp ground wire adapters smaller connector unused car worked reinserted empty dimmer position harnesses larger connector everything works like champ daynight mode switched illumination adjustable dimming illumination dimming availability vehicle speed information vss without pulling dashboard cutting factory harness use connector allowed ability owner go back factory radio swap another head unit no problems needed