the swi-ps allows the customer to retain the use of their steering wheel or rear seat radio controls when replacing the factory head unit. works with pioneer and sony radios with wired remote inputs. the swi-ps also retains the use of heater control buttons on gm vehicles. the swi-ps features just can t be beat. the swi-ps is so universal that you only need one sku# to cover over 95% of the vehicles made from 1986 to current. new vehicles coming out every year? no problem! never be stuck with a vehicle specific type interface. assign the buttons on the steering wheel to any of the 9 specific pioneer functions. volume up volume down mute track up track down source preset up preset down and band. the swi-ps has non-volatile memory which keeps all programming in memory even if the vehicle battery is disconnected. the swi-ps not only covers ford gm or chrysler/dodge but also it covers acura audi bmw buick cadillac chevrolet chysler gmc honda hummer infiniti isuzu jaguar land rover lincoln mazda mercury mitsubishi nissan oldsmobile pontiac saab suzuki toyota and volkswagan. oh did we also say it covers harley davidson motorcycles? for sony radios: will only work on sony radios that have an input for the rm-x2s rm-x3s or rm-x4s wired remotes. for pioneer radios: unless noted the swi-ps will work with all pioneer radios that have a steering wheel remote input.